工具类涉及数据库连接、格式转换、文件操作、发送邮件等等
数据库连接工具类
数据库连接工具类——仅仅获得连接对象 ConnDB.java
import java.sql.Connection;
import java.sql.DriverManager;
/**
* 数据库连接工具类——仅仅获得连接对象
*
*/
public class ConnDB {
private static Connection conn = null;
private static final String DRIVER_NAME = "com.mysql.jdbc.Driver";
private static final String URL = "jdbc:mysql://localhost:3306/axt?useUnicode=true&characterEncoding=UTF-8";
private static final String USER_NAME = "root";
private static final String PASSWORD = "root";
public static Connection getConn(){
try {
Class.forName(DRIVER_NAME);
conn = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
}
package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
/**
* 数据库连接工具类——仅仅获得连接对象
*
*/
public class ConnDB {
private static Connection conn = null;
private static final String DRIVER_NAME = "com.mysql.jdbc.Driver";
private static final String URL = "jdbc:mysql://localhost:3306/axt?useUnicode=true&characterEncoding=UTF-8";
private static final String USER_NAME = "root";
private static final String PASSWORD = "root";
public static Connection getConn(){
try {
Class.forName(DRIVER_NAME);
conn = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
}
数据库连接工具类——包含取得连接和关闭资源 ConnUtil.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* @className: ConnUtil.java
* @classDescription: 数据库连接工具类——包含取得连接和关闭资源
* @function:
* @author: Wentasy
* @createTime: 2012-9-24 上午11:51:15
* @modifyTime:
* @modifyReason:
* @since: JDK 1.6
*/
public class ConnUtil {
public static final String url = "jdbc:mysql://XXX.XXX.XXX.XXX:3306/dbadapter";
public static final String user = "root";
public static final String password = "XXXXXX";
/**
* 得到连接
* @return
* @throws SQLException
* @throws ClassNotFoundException
*/
public static Connection establishConn() throws SQLException,ClassNotFoundException{
Class.forName("com.mysql.jdbc.Driver");
return DriverManager.getConnection(url, user, password);
}
/**
* 关闭连接
* @param conn
* @throws SQLException
*/
public static void close(Connection conn) throws SQLException{
if(conn != null){
conn.close();
conn = null;
}
}
/**
* 关闭PreparedStatement
* @param pstmt
* @throws SQLException
*/
public static void close(PreparedStatement pstmt) throws SQLException{
if(pstmt != null){
pstmt.close();
pstmt = null;
}
}
/**
* 关闭结果集
* @param rs
* @throws SQLException
*/
public static void close(ResultSet rs) throws SQLException{
if(rs != null){
rs.close();
rs = null;
}
}
}
package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* @className: ConnUtil.java
* @classDescription: 数据库连接工具类——包含取得连接和关闭资源
* @function:
* @author: Wentasy
* @createTime: 2012-9-24 上午11:51:15
* @modifyTime:
* @modifyReason:
* @since: JDK 1.6
*/
public class ConnUtil {
public static final String url = "jdbc:mysql://XXX.XXX.XXX.XXX:3306/dbadapter";
public static final String user = "root";
public static final String password = "XXXXXX";
/**
* 得到连接
* @return
* @throws SQLException
* @throws ClassNotFoundException
*/
public static Connection establishConn() throws SQLException,ClassNotFoundException{
Class.forName("com.mysql.jdbc.Driver");
return DriverManager.getConnection(url, user, password);
}
/**
* 关闭连接
* @param conn
* @throws SQLException
*/
public static void close(Connection conn) throws SQLException{
if(conn != null){
conn.close();
conn = null;
}
}
/**
* 关闭PreparedStatement
* @param pstmt
* @throws SQLException
*/
public static void close(PreparedStatement pstmt) throws SQLException{
if(pstmt != null){
pstmt.close();
pstmt = null;
}
}
/**
* 关闭结果集
* @param rs
* @throws SQLException
*/
public static void close(ResultSet rs) throws SQLException{
if(rs != null){
rs.close();
rs = null;
}
}
}
格式转换工具类
日期转换工具类 CommUtil.java
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* 日期转换工具类
*/
public class CommUtil {
/**
* 将日期格式转换成yyyy-MM-dd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static String dateToString(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
return stringTime;
}
/**
* 将日期格式转换成yyyyMMdd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static String dateTimeToString(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyyMMdd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
return stringTime;
}
/**
* 将日期格式转换成yyyy-MM-dd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static Date dateToDate(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
Date date = null;
try {
date = formatter.parse(stringTime);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 得到当前时间，以字符串表示
* @return
*/
public static String getDate(){
Date date = new Date();
return CommUtil.dateToString(date);
}
}
package com.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* 日期转换工具类
*/
public class CommUtil {
/**
* 将日期格式转换成yyyy-MM-dd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static String dateToString(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
return stringTime;
}
/**
* 将日期格式转换成yyyyMMdd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static String dateTimeToString(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyyMMdd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
return stringTime;
}
/**
* 将日期格式转换成yyyy-MM-dd的字符串格式
* 返回值如：2010-10-06
* @param time 要转换的日期
* @return
*/
public static Date dateToDate(Date time) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd"); //定义将日期格式要换成的格式
String stringTime = formatter.format(time);
Date date = null;
try {
date = formatter.parse(stringTime);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 得到当前时间，以字符串表示
* @return
*/
public static String getDate(){
Date date = new Date();
return CommUtil.dateToString(date);
}
}
日期转换类 DateConverter.java
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
/**
* 日期转换类
*
*/
public class DateConverter extends DefaultTypeConverter {
private static final DateFormat[] ACCEPT_DATE_FORMATS = {
new SimpleDateFormat("dd/MM/yyyy"),
new SimpleDateFormat("yyyy-MM-dd"),
new SimpleDateFormat("yyyy/MM/dd") }; //支持转换的日期格式
@Override
public Object convertValue(Map context, Object value, Class toType) {
if (toType == Date.class) { //浏览器向服务器提交时，进行String to Date的转换
Date date = null;
String dateString = null;
String[] params = (String[])value;
dateString = params[0];//获取日期的字符串
for (DateFormat format : ACCEPT_DATE_FORMATS) {
try {
return format.parse(dateString);//遍历日期支持格式，进行转换
} catch(Exception e) {
continue;
}
}
return null;
}
else if (toType == String.class) { //服务器向浏览器输出时，进行Date to String的类型转换
Date date = (Date)value;
return new SimpleDateFormat("yyyy-MM-dd").format(date);//输出的格式是yyyy-MM-dd
}
return null;
}
}
package com.util;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
/**
* 日期转换类
*
*/
public class DateConverter extends DefaultTypeConverter {
private static final DateFormat[] ACCEPT_DATE_FORMATS = {
new SimpleDateFormat("dd/MM/yyyy"),
new SimpleDateFormat("yyyy-MM-dd"),
new SimpleDateFormat("yyyy/MM/dd") }; //支持转换的日期格式
@Override
public Object convertValue(Map context, Object value, Class toType) {
if (toType == Date.class) { //浏览器向服务器提交时，进行String to Date的转换
Date date = null;
String dateString = null;
String[] params = (String[])value;
dateString = params[0];//获取日期的字符串
for (DateFormat format : ACCEPT_DATE_FORMATS) {
try {
return format.parse(dateString);//遍历日期支持格式，进行转换
} catch(Exception e) {
continue;
}
}
return null;
}
else if (toType == String.class) { //服务器向浏览器输出时，进行Date to String的类型转换
Date date = (Date)value;
return new SimpleDateFormat("yyyy-MM-dd").format(date);//输出的格式是yyyy-MM-dd
}
return null;
}
}
功能更强大的格式化工具类 FormatUtils.java
[java] view plaincopyprint?package com.util;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* 功能更强大的格式化工具类
*/
public class FormatUtils {
private static SimpleDateFormat second = new SimpleDateFormat(
"yy-MM-dd hh:mm:ss");
private static SimpleDateFormat day = new SimpleDateFormat("yyyy-MM-dd");
private static SimpleDateFormat detailDay = new SimpleDateFormat("yyyy年MM月dd日");
private static SimpleDateFormat fileName = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
private static SimpleDateFormat tempTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static SimpleDateFormat excelDate = new SimpleDateFormat("yyyy/MM/dd");
/**
* 格式化excel中的时间
* @param date
* @return
*/
public static String formatDateForExcelDate(Date date) {
return excelDate.format(date);
}
/**
* 将日期格式化作为文件名
* @param date
* @return
*/
public static String formatDateForFileName(Date date) {
return fileName.format(date);
}
/**
* 格式化日期(精确到秒)
*
* @param date
* @return
*/
public static String formatDateSecond(Date date) {
return second.format(date);
}
/**
* 格式化日期(精确到秒)
*
* @param date
* @return
*/
public static String tempDateSecond(Date date) {
return tempTime.format(date);
}
public static Date tempDateSecond(String str) {
try {
return tempTime.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return new Date();
}
/**
* 格式化日期(精确到天)
*
* @param date
* @return
*/
public static String formatDateDay(Date date) {
return day.format(date);
}
/**
* 格式化日期(精确到天)
*
* @param date
* @return
*/
public static String formatDateDetailDay(Date date) {
return detailDay.format(date);
}
/**
* 将double类型的数字保留两位小数（四舍五入）
*
* @param number
* @return
*/
public static String formatNumber(double number) {
DecimalFormat df = new DecimalFormat();
df.applyPattern("#0.00");
return df.format(number);
}
/**
* 将字符串转换成日期
*
* @param date
* @return
* @throws Exception
*/
public static Date formateDate(String date) throws Exception {
return day.parse(date);
}
/**
* 将字符日期转换成Date
* @param date
* @return
* @throws Exception
*/
public static Date parseStringToDate(String date) throws Exception {
return day.parse(date);
}
public static String formatDoubleNumber(double number) {
DecimalFormat df = new DecimalFormat("#");
return df.format(number);
}
}
package com.util;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* 功能更强大的格式化工具类
*/
public class FormatUtils {
private static SimpleDateFormat second = new SimpleDateFormat(
"yy-MM-dd hh:mm:ss");
private static SimpleDateFormat day = new SimpleDateFormat("yyyy-MM-dd");
private static SimpleDateFormat detailDay = new SimpleDateFormat("yyyy年MM月dd日");
private static SimpleDateFormat fileName = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
private static SimpleDateFormat tempTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static SimpleDateFormat excelDate = new SimpleDateFormat("yyyy/MM/dd");
/**
* 格式化excel中的时间
* @param date
* @return
*/
public static String formatDateForExcelDate(Date date) {
return excelDate.format(date);
}
/**
* 将日期格式化作为文件名
* @param date
* @return
*/
public static String formatDateForFileName(Date date) {
return fileName.format(date);
}
/**
* 格式化日期(精确到秒)
*
* @param date
* @return
*/
public static String formatDateSecond(Date date) {
return second.format(date);
}
/**
* 格式化日期(精确到秒)
*
* @param date
* @return
*/
public static String tempDateSecond(Date date) {
return tempTime.format(date);
}
public static Date tempDateSecond(String str) {
try {
return tempTime.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return new Date();
}
/**
* 格式化日期(精确到天)
*
* @param date
* @return
*/
public static String formatDateDay(Date date) {
return day.format(date);
}
/**
* 格式化日期(精确到天)
*
* @param date
* @return
*/
public static String formatDateDetailDay(Date date) {
return detailDay.format(date);
}
/**
* 将double类型的数字保留两位小数（四舍五入）
*
* @param number
* @return
*/
public static String formatNumber(double number) {
DecimalFormat df = new DecimalFormat();
df.applyPattern("#0.00");
return df.format(number);
}
/**
* 将字符串转换成日期
*
* @param date
* @return
* @throws Exception
*/
public static Date formateDate(String date) throws Exception {
return day.parse(date);
}
/**
* 将字符日期转换成Date
* @param date
* @return
* @throws Exception
*/
public static Date parseStringToDate(String date) throws Exception {
return day.parse(date);
}
public static String formatDoubleNumber(double number) {
DecimalFormat df = new DecimalFormat("#");
return df.format(number);
}
}
文件操作工具类
目录操作工具类 CopyDir.java
import java.io.*;
/**
* 1,建立目的目录。 2，遍历源目录。 3，遍历过程中，创建文件或者文件夹。 原理：其实就是改变了源文件或者目录的目录头。
* @datetime Dsc 24
*/
public class CopyDir {
private File sDir, dDir, newDir;
public CopyDir(String s, String d) {
this(new File(s), new File(d));
}
CopyDir(File sDir, File dDir)// c:\\Test d:\\abc
{
this.sDir = sDir;
this.dDir = dDir;
}
public void copyDir() throws IOException {
// 是创建目的目录。也就是创建要拷贝的源文件夹。Test
// 获取源文件夹名称。
String name = sDir.getName();
// 通过该名称在目的目录创建该文件夹，为了存放源文件夹中的文件或者文件夹。
// 将目的目录和源文件夹名称，封装成File对象。
newDir = dDir;
// new File(dDir,name);
// 调用该对象的mkdir方法。在目的目录创建该文件夹。d:\\abc\\Test
newDir.mkdir();//
// 遍历源文件夹。
listAll(sDir);
}
/*
* 将遍历目录封装成方法。 在遍历过程中，遇到文件创建文件。 遇到目录创建目录。
*/
private void listAll(File dir) throws IOException {
File[] files = dir.listFiles();
for (int x = 0; x < files.length; x++) {
if (files[x].isDirectory()) {
createDir(files[x]);// 调用创建目录的方法。
listAll(files[x]);// 在继续进行递归。进入子级目录。
} else {
createFile(files[x]);// 调用创建文件的方法。
}
}
}
/*
* copy目录。通过源目录在目的目录创建新目录。
*/
private void createDir(File dir) {
File d = replaceFile(dir);
d.mkdir();
}
/*
* copy文件。
*/
private void createFile(File file) throws IOException {
File newFile = replaceFile(file);
// copy文件是一个数据数据传输的过程。需要通过流来完成。
FileInputStream fis = new FileInputStream(file);
FileOutputStream fos = new FileOutputStream(newFile);
byte[] buf = new byte[1024 * 2];
int num = 0;
while ((num = fis.read(buf)) != -1) {
fos.write(buf, 0, num);
}
fos.close();
fis.close();
}
/*
* 替换路径。
*/
private File replaceFile(File f) {
// 原理是：将源目录的父目录(C:\\Tset)，替换成目的父目录。（d:\\abc\\Test）
String path = f.getAbsolutePath();// 获取源文件或者文件夹的决定路径。
// 将源文件或者文件夹的绝对路径替换成目的路径。
String newPath = path.replace(sDir.getAbsolutePath(), newDir
.getAbsolutePath());
// 将新的目的路径封装成File对象
File newFile = new File(newPath);
return newFile;
}
}
package com.util;
import java.io.*;
/**
* 1,建立目的目录。 2，遍历源目录。 3，遍历过程中，创建文件或者文件夹。 原理：其实就是改变了源文件或者目录的目录头。
* @datetime Dsc 24
*/
public class CopyDir {
private File sDir, dDir, newDir;
public CopyDir(String s, String d) {
this(new File(s), new File(d));
}
CopyDir(File sDir, File dDir)// c:\\Test d:\\abc
{
this.sDir = sDir;
this.dDir = dDir;
}
public void copyDir() throws IOException {
// 是创建目的目录。也就是创建要拷贝的源文件夹。Test
// 获取源文件夹名称。
String name = sDir.getName();
// 通过该名称在目的目录创建该文件夹，为了存放源文件夹中的文件或者文件夹。
// 将目的目录和源文件夹名称，封装成File对象。
newDir = dDir;
// new File(dDir,name);
// 调用该对象的mkdir方法。在目的目录创建该文件夹。d:\\abc\\Test
newDir.mkdir();//
// 遍历源文件夹。
listAll(sDir);
}
/*
* 将遍历目录封装成方法。 在遍历过程中，遇到文件创建文件。 遇到目录创建目录。
*/
private void listAll(File dir) throws IOException {
File[] files = dir.listFiles();
for (int x = 0; x < files.length; x++) {
if (files[x].isDirectory()) {
createDir(files[x]);// 调用创建目录的方法。
listAll(files[x]);// 在继续进行递归。进入子级目录。
} else {
createFile(files[x]);// 调用创建文件的方法。
}
}
}
/*
* copy目录。通过源目录在目的目录创建新目录。
*/
private void createDir(File dir) {
File d = replaceFile(dir);
d.mkdir();
}
/*
* copy文件。
*/
private void createFile(File file) throws IOException {
File newFile = replaceFile(file);
// copy文件是一个数据数据传输的过程。需要通过流来完成。
FileInputStream fis = new FileInputStream(file);
FileOutputStream fos = new FileOutputStream(newFile);
byte[] buf = new byte[1024 * 2];
int num = 0;
while ((num = fis.read(buf)) != -1) {
fos.write(buf, 0, num);
}
fos.close();
fis.close();
}
/*
* 替换路径。
*/
private File replaceFile(File f) {
// 原理是：将源目录的父目录(C:\\Tset)，替换成目的父目录。（d:\\abc\\Test）
String path = f.getAbsolutePath();// 获取源文件或者文件夹的决定路径。
// 将源文件或者文件夹的绝对路径替换成目的路径。
String newPath = path.replace(sDir.getAbsolutePath(), newDir
.getAbsolutePath());
// 将新的目的路径封装成File对象
File newFile = new File(newPath);
return newFile;
}
}
文件/目录部分处理工具类 DealDir.java
import java.io.File;
import java.util.StringTokenizer;
/**
* 文件/目录 部分处理
* @createTime Dec 25, 2010 7:06:58 AM
* @version 1.0
*/
public class DealDir {
/**
* 获取文件的后缀名并转化成大写
*
* @param fileName
* 文件名
* @return
*/
public String getFileSuffix(String fileName) throws Exception {
return fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length()).toUpperCase();
}
/**
* 创建多级目录
*
* @param path
* 目录的绝对路径
*/
public void createMultilevelDir(String path) {
try {
StringTokenizer st = new StringTokenizer(path, "/");
String path1 = st.nextToken() + "/";
String path2 = path1;
while (st.hasMoreTokens()) {
path1 = st.nextToken() + "/";
path2 += path1;
File inbox = new File(path2);
if (!inbox.exists())
inbox.mkdir();
}
} catch (Exception e) {
System.out.println("目录创建失败" + e);
e.printStackTrace();
}
}
/**
* 删除文件/目录(递归删除文件/目录)
*
* @param path
* 文件或文件夹的绝对路径
*/
public void deleteAll(String dirpath) {
if (dirpath == null) {
System.out.println("目录为空");
} else {
File path = new File(dirpath);
try {
if (!path.exists())
return;// 目录不存在退出
if (path.isFile()) // 如果是文件删除
{
path.delete();
return;
}
File[] files = path.listFiles();// 如果目录中有文件递归删除文件
for (int i = 0; i < files.length; i++) {
deleteAll(files[i].getAbsolutePath());
}
path.delete();
} catch (Exception e) {
System.out.println("文件/目录 删除失败" + e);
e.printStackTrace();
}
}
}
/**
* 文件/目录 重命名
*
* @param oldPath
* 原有路径（绝对路径）
* @param newPath
* 更新路径
* @author lyf 注：不能修改上层次的目录
*/
public void renameDir(String oldPath, String newPath) {
File oldFile = new File(oldPath);// 文件或目录
File newFile = new File(newPath);// 文件或目录
try {
boolean success = oldFile.renameTo(newFile);// 重命名
if (!success) {
System.out.println("重命名失败");
} else {
System.out.println("重命名成功");
}
} catch (RuntimeException e) {
e.printStackTrace();
}
}
}
package com.util;
import java.io.File;
import java.util.StringTokenizer;
/**
* 文件/目录 部分处理
* @createTime Dec 25, 2010 7:06:58 AM
* @version 1.0
*/
public class DealDir {
/**
* 获取文件的后缀名并转化成大写
*
* @param fileName
* 文件名
* @return
*/
public String getFileSuffix(String fileName) throws Exception {
return fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length()).toUpperCase();
}
/**
* 创建多级目录
*
* @param path
* 目录的绝对路径
*/
public void createMultilevelDir(String path) {
try {
StringTokenizer st = new StringTokenizer(path, "/");
String path1 = st.nextToken() + "/";
String path2 = path1;
while (st.hasMoreTokens()) {
path1 = st.nextToken() + "/";
path2 += path1;
File inbox = new File(path2);
if (!inbox.exists())
inbox.mkdir();
}
} catch (Exception e) {
System.out.println("目录创建失败" + e);
e.printStackTrace();
}
}
/**
* 删除文件/目录(递归删除文件/目录)
*
* @param path
* 文件或文件夹的绝对路径
*/
public void deleteAll(String dirpath) {
if (dirpath == null) {
System.out.println("目录为空");
} else {
File path = new File(dirpath);
try {
if (!path.exists())
return;// 目录不存在退出
if (path.isFile()) // 如果是文件删除
{
path.delete();
return;
}
File[] files = path.listFiles();// 如果目录中有文件递归删除文件
for (int i = 0; i < files.length; i++) {
deleteAll(files[i].getAbsolutePath());
}
path.delete();
} catch (Exception e) {
System.out.println("文件/目录 删除失败" + e);
e.printStackTrace();
}
}
}
/**
* 文件/目录 重命名
*
* @param oldPath
* 原有路径（绝对路径）
* @param newPath
* 更新路径
* @author lyf 注：不能修改上层次的目录
*/
public void renameDir(String oldPath, String newPath) {
File oldFile = new File(oldPath);// 文件或目录
File newFile = new File(newPath);// 文件或目录
try {
boolean success = oldFile.renameTo(newFile);// 重命名
if (!success) {
System.out.println("重命名失败");
} else {
System.out.println("重命名成功");
}
} catch (RuntimeException e) {
e.printStackTrace();
}
}
}
目录处理工具类 DealWithDir.java
import java.io.File;
/**
* 目录处理工具类
*
*/
public class DealWithDir {
/**
* 新建目录
*/
public static boolean newDir(String path) throws Exception {
File file = new File(path);
return file.mkdirs();//创建目录
}
/**
* 删除目录
*/
public static boolean deleteDir(String path) throws Exception {
File file = new File(path);
if (!file.exists())
return false;// 目录不存在退出
if (file.isFile()) // 如果是文件删除
{
file.delete();
return false;
}
File[] files = file.listFiles();// 如果目录中有文件递归删除文件
for (int i = 0; i < files.length; i++) {
deleteDir(files[i].getAbsolutePath());
}
file.delete();
return file.delete();//删除目录
}
/**
* 更新目录
*/
public static boolean updateDir(String path, String newPath) throws Exception {
File file = new File(path);
File newFile = new File(newPath);
return file.renameTo(newFile);
}
public static void main(String d[]) throws Exception{
//deleteDir("d:/ff/dddf");
updateDir("D:\\TOOLS\\Tomcat 6.0\\webapps\\BCCCSM\\nationalExperiment/22222", "D:\\TOOLS\\Tomcat 6.0\\webapps\\BCCCSM\\nationalExperiment/224222");
}
}
package com.util;
import java.io.File;
/**
* 目录处理工具类
*
*/
public class DealWithDir {
/**
* 新建目录
*/
public static boolean newDir(String path) throws Exception {
File file = new File(path);
return file.mkdirs();//创建目录
}
/**
* 删除目录
*/
public static boolean deleteDir(String path) throws Exception {
File file = new File(path);
if (!file.exists())
return false;// 目录不存在退出
if (file.isFile()) // 如果是文件删除
{
file.delete();
return false;
}
File[] files = file.listFiles();// 如果目录中有文件递归删除文件
for (int i = 0; i < files.length; i++) {
deleteDir(files[i].getAbsolutePath());
}
file.delete();
return file.delete();//删除目录
}
/**
* 更新目录
*/
public static boolean updateDir(String path, String newPath) throws Exception {
File file = new File(path);
File newFile = new File(newPath);
return file.renameTo(newFile);
}
public static void main(String d[]) throws Exception{
//deleteDir("d:/ff/dddf");
updateDir("D:\\TOOLS\\Tomcat 6.0\\webapps\\BCCCSM\\nationalExperiment/22222", "D:\\TOOLS\\Tomcat 6.0\\webapps\\BCCCSM\\nationalExperiment/224222");
}
}
删除文件夹工具类 DeleteFolder.java
import java.io.File;
/**
* 删除文件夹
* @createTime DSC 20, 2010 15:38
* @version 2.0
*/
public class DeleteFolder {
// 删除文件夹
// param folderPath 文件夹完整绝对路径
public static void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 删除完里面所有内容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 删除空文件夹
} catch (Exception e) {
e.printStackTrace();
}
}
// 删除指定文件夹下所有文件
// param path 文件夹完整绝对路径
public static boolean delAllFile(String path) {
boolean flag = false;
File file = new File(path);
if (!file.exists()) {
return flag;
}
if (!file.isDirectory()) {
return flag;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (path.endsWith(File.separator)) {
temp = new File(path + tempList[i]);
} else {
temp = new File(path + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件
delFolder(path + "/" + tempList[i]);// 再删除空文件夹
flag = true;
}
}
return flag;
}
}
package com.util;
import java.io.File;
/**
* 删除文件夹
* @createTime DSC 20, 2010 15:38
* @version 2.0
*/
public class DeleteFolder {
// 删除文件夹
// param folderPath 文件夹完整绝对路径
public static void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 删除完里面所有内容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 删除空文件夹
} catch (Exception e) {
e.printStackTrace();
}
}
// 删除指定文件夹下所有文件
// param path 文件夹完整绝对路径
public static boolean delAllFile(String path) {
boolean flag = false;
File file = new File(path);
if (!file.exists()) {
return flag;
}
if (!file.isDirectory()) {
return flag;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (path.endsWith(File.separator)) {
temp = new File(path + tempList[i]);
} else {
temp = new File(path + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件
delFolder(path + "/" + tempList[i]);// 再删除空文件夹
flag = true;
}
}
return flag;
}
}
文件上传工具类 UploadUtil.java
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Calendar;
/**
* 文件上传工具类
*
*/
public class UploadUtil {
private static final int BUFFER_SIZE = 16 * 1024;
//保存图片
public static synchronized void copy(File src, File newFile) {
try {
InputStream is = null;
OutputStream os = null;
try {
is = new BufferedInputStream(new FileInputStream(src),
BUFFER_SIZE);
os = new BufferedOutputStream(new FileOutputStream(newFile),
BUFFER_SIZE);
byte[] buffer = new byte[BUFFER_SIZE];
while (is.read(buffer) > 0) {
os.write(buffer);
}
} finally {
if (null != is) {
is.close();
}
if (null != os) {
os.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 返回 年号+月号+天+时+分+秒+随机码
* @return
*/
@SuppressWarnings("static-access")
public static synchronized String getTime() {
Calendar calendar = Calendar.getInstance();
String year = calendar.get(calendar.YEAR) + "";
String month = (calendar.get(calendar.MONTH) + 1) + "";
String day = calendar.get(calendar.DAY_OF_MONTH) + "";
String hour = calendar.get(calendar.HOUR_OF_DAY) + "";
String minute = calendar.get(calendar.MINUTE) + "";
String second = calendar.get(calendar.SECOND) + "";
String milliSecond = calendar.get(calendar.MILLISECOND) + "";
int r = (int)(Math.random()*100000);
String random = String.valueOf(r);
return year + month + day + hour + minute + second + milliSecond + random+"a";
}
}
package com.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Calendar;
/**
* 文件上传工具类
*
*/
public class UploadUtil {
private static final int BUFFER_SIZE = 16 * 1024;
//保存图片
public static synchronized void copy(File src, File newFile) {
try {
InputStream is = null;
OutputStream os = null;
try {
is = new BufferedInputStream(new FileInputStream(src),
BUFFER_SIZE);
os = new BufferedOutputStream(new FileOutputStream(newFile),
BUFFER_SIZE);
byte[] buffer = new byte[BUFFER_SIZE];
while (is.read(buffer) > 0) {
os.write(buffer);
}
} finally {
if (null != is) {
is.close();
}
if (null != os) {
os.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 返回 年号+月号+天+时+分+秒+随机码
* @return
*/
@SuppressWarnings("static-access")
public static synchronized String getTime() {
Calendar calendar = Calendar.getInstance();
String year = calendar.get(calendar.YEAR) + "";
String month = (calendar.get(calendar.MONTH) + 1) + "";
String day = calendar.get(calendar.DAY_OF_MONTH) + "";
String hour = calendar.get(calendar.HOUR_OF_DAY) + "";
String minute = calendar.get(calendar.MINUTE) + "";
String second = calendar.get(calendar.SECOND) + "";
String milliSecond = calendar.get(calendar.MILLISECOND) + "";
int r = (int)(Math.random()*100000);
String random = String.valueOf(r);
return year + month + day + hour + minute + second + milliSecond + random+"a";
}
}
其他工具类
MD5编码工具类 MD5Code.java
/**
* MD5编码工具类
*
*/
public class MD5Code {
static final int S11 = 7;
static final int S12 = 12;
static final int S13 = 17;
static final int S14 = 22;
static final int S21 = 5;
static final int S22 = 9;
static final int S23 = 14;
static final int S24 = 20;
static final int S31 = 4;
static final int S32 = 11;
static final int S33 = 16;
static final int S34 = 23;
static final int S41 = 6;
static final int S42 = 10;
static final int S43 = 15;
static final int S44 = 21;
static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0 };
private long[] state = new long[4];// state (ABCD)
private long[] count = new long[2];// number of bits, modulo 2^64 (lsb
// first)
private byte[] buffer = new byte[64]; // input buffer
public String digestHexStr;
private byte[] digest = new byte[16];
public String getMD5ofStr(String inbuf) {
md5Init();
md5Update(inbuf.getBytes(), inbuf.length());
md5Final();
digestHexStr = "";
for (int i = 0; i < 16; i++) {
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
}
public MD5Code() {
md5Init();
return;
}
private void md5Init() {
count[0] = 0L;
count[1] = 0L;
// /* Load magic initialization constants.
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
return;
}
private long F(long x, long y, long z) {
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) {
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) {
return x ^ y ^ z;
}
private long I(long x, long y, long z) {
return y ^ (x | (~z));
}
private long FF(long a, long b, long c, long d, long x, long s, long ac) {
a += F(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long GG(long a, long b, long c, long d, long x, long s, long ac) {
a += G(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long HH(long a, long b, long c, long d, long x, long s, long ac) {
a += H(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long II(long a, long b, long c, long d, long x, long s, long ac) {
a += I(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private void md5Update(byte[] inbuf, int inputLen) {
int i, index, partLen;
byte[] block = new byte[64];
index = (int) (count[0] >>> 3) & 0x3F;
// /* Update number of bits */
if ((count[0] += (inputLen << 3)) < (inputLen << 3))
count[1]++;
count[1] += (inputLen >>> 29);
partLen = 64 - index;
// Transform as many times as possible.
if (inputLen >= partLen) {
md5Memcpy(buffer, inbuf, index, 0, partLen);
md5Transform(buffer);
for (i = partLen; i + 63 < inputLen; i += 64) {
md5Memcpy(block, inbuf, 0, i, 64);
md5Transform(block);
}
index = 0;
} else
i = 0;
// /* Buffer remaining input */
md5Memcpy(buffer, inbuf, index, i, inputLen - i);
}
private void md5Final() {
byte[] bits = new byte[8];
int index, padLen;
// /* Save number of bits */
Encode(bits, count, 8);
// /* Pad out to 56 mod 64.
index = (int) (count[0] >>> 3) & 0x3f;
padLen = (index < 56) ? (56 - index) : (120 - index);
md5Update(PADDING, padLen);
// /* Append length (before padding) */
md5Update(bits, 8);
// /* Store state in digest */
Encode(digest, state, 16);
}
private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos,
int len) {
int i;
for (i = 0; i < len; i++)
output[outpos + i] = input[inpos + i];
}
private void md5Transform(byte block[]) {
long a = state[0], b = state[1], c = state[2], d = state[3];
long[] x = new long[16];
Decode(x, block, 64);
/* Round 1 */
a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
/* Round 2 */
a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
/* Round 3 */
a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
/* Round 4 */
a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
private void Encode(byte[] output, long[] input, int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (byte) (input[i] & 0xffL);
output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
}
}
private void Decode(long[] output, byte[] input, int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8)
| (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);
return;
}
public static long b2iu(byte b) {
return b < 0 ? b & 0x7F + 128 : b;
}
public static String byteHEX(byte ib) {
char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
'B', 'C', 'D', 'E', 'F' };
char[] ob = new char[2];
ob[0] = Digit[(ib >>> 4) & 0X0F];
ob[1] = Digit[ib & 0X0F];
String s = new String(ob);
return s;
}
}
package com.util;
/**
* MD5编码工具类
*
*/
public class MD5Code {
static final int S11 = 7;
static final int S12 = 12;
static final int S13 = 17;
static final int S14 = 22;
static final int S21 = 5;
static final int S22 = 9;
static final int S23 = 14;
static final int S24 = 20;
static final int S31 = 4;
static final int S32 = 11;
static final int S33 = 16;
static final int S34 = 23;
static final int S41 = 6;
static final int S42 = 10;
static final int S43 = 15;
static final int S44 = 21;
static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0 };
private long[] state = new long[4];// state (ABCD)
private long[] count = new long[2];// number of bits, modulo 2^64 (lsb
// first)
private byte[] buffer = new byte[64]; // input buffer
public String digestHexStr;
private byte[] digest = new byte[16];
public String getMD5ofStr(String inbuf) {
md5Init();
md5Update(inbuf.getBytes(), inbuf.length());
md5Final();
digestHexStr = "";
for (int i = 0; i < 16; i++) {
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
}
public MD5Code() {
md5Init();
return;
}
private void md5Init() {
count[0] = 0L;
count[1] = 0L;
// /* Load magic initialization constants.
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
return;
}
private long F(long x, long y, long z) {
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) {
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) {
return x ^ y ^ z;
}
private long I(long x, long y, long z) {
return y ^ (x | (~z));
}
private long FF(long a, long b, long c, long d, long x, long s, long ac) {
a += F(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long GG(long a, long b, long c, long d, long x, long s, long ac) {
a += G(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long HH(long a, long b, long c, long d, long x, long s, long ac) {
a += H(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private long II(long a, long b, long c, long d, long x, long s, long ac) {
a += I(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));
a += b;
return a;
}
private void md5Update(byte[] inbuf, int inputLen) {
int i, index, partLen;
byte[] block = new byte[64];
index = (int) (count[0] >>> 3) & 0x3F;
// /* Update number of bits */
if ((count[0] += (inputLen << 3)) < (inputLen << 3))
count[1]++;
count[1] += (inputLen >>> 29);
partLen = 64 - index;
// Transform as many times as possible.
if (inputLen >= partLen) {
md5Memcpy(buffer, inbuf, index, 0, partLen);
md5Transform(buffer);
for (i = partLen; i + 63 < inputLen; i += 64) {
md5Memcpy(block, inbuf, 0, i, 64);
md5Transform(block);
}
index = 0;
} else
i = 0;
// /* Buffer remaining input */
md5Memcpy(buffer, inbuf, index, i, inputLen - i);
}
private void md5Final() {
byte[] bits = new byte[8];
int index, padLen;
// /* Save number of bits */
Encode(bits, count, 8);
// /* Pad out to 56 mod 64.
index = (int) (count[0] >>> 3) & 0x3f;
padLen = (index < 56) ? (56 - index) : (120 - index);
md5Update(PADDING, padLen);
// /* Append length (before padding) */
md5Update(bits, 8);
// /* Store state in digest */
Encode(digest, state, 16);
}
private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos,
int len) {
int i;
for (i = 0; i < len; i++)
output[outpos + i] = input[inpos + i];
}
private void md5Transform(byte block[]) {
long a = state[0], b = state[1], c = state[2], d = state[3];
long[] x = new long[16];
Decode(x, block, 64);
/* Round 1 */
a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
/* Round 2 */
a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
/* Round 3 */
a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
/* Round 4 */
a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
private void Encode(byte[] output, long[] input, int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (byte) (input[i] & 0xffL);
output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
}
}
private void Decode(long[] output, byte[] input, int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8)
| (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);
return;
}
public static long b2iu(byte b) {
return b < 0 ? b & 0x7F + 128 : b;
}
public static String byteHEX(byte ib) {
char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
'B', 'C', 'D', 'E', 'F' };
char[] ob = new char[2];
ob[0] = Digit[(ib >>> 4) & 0X0F];
ob[1] = Digit[ib & 0X0F];
String s = new String(ob);
return s;
}
}
读取Config文件工具类 PropertiesConfig.java
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;
/**
* 读取Config文件工具类
* @version 1.0
* @since JDK 1.6
*/
public class PropertiesConfig {
/**
* 获取整个配置文件中的属性
* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
*/
public static Properties readData(String filePath) {
filePath = getRealPath(filePath);
Properties props = new Properties();
try {
InputStream in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
in.close();
return props;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static String getRealPath(String filePath) {
//获取绝对路径 并截掉路径的”file:/“前缀
return PropertiesConfig.class.getResource("/" + filePath).toString().substring(6);
}
}
package com.util;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;
/**
* 读取Config文件工具类
* @version 1.0
* @since JDK 1.6
*/
public class PropertiesConfig {
/**
* 获取整个配置文件中的属性
* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
*/
public static Properties readData(String filePath) {
filePath = getRealPath(filePath);
Properties props = new Properties();
try {
InputStream in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
in.close();
return props;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static String getRealPath(String filePath) {
//获取绝对路径 并截掉路径的”file:/“前缀
return PropertiesConfig.class.getResource("/" + filePath).toString().substring(6);
}
}
自动扫描FTP文件工具类 ScanFtp.java
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* 自动扫描FTP文件工具类
* 需要定时执行
*/
public class ScanFtp {
//服务器图片路径文件夹
private String serverLocal = "D:/TOOLS/Tomcat 6.0/webapps/BCCCSM/modelforcast/";
//图片上传文件夹存放路径,文件夹内应包含AGCM CSM ZS 3个子文件夹分别存放需要扫描到tomcat中的图片
private String saveLocal = "D:/modelForcast/";
/**
* 获得远程权限
* @return
*/
private void getFTPAdress(){
//登陆成功
}
/**
* 开始扫描
* @throws IOException
*/
private void scan() throws IOException {
this.getFTPAdress();
File file = new File(saveLocal + "AGCM"); //打开AGCM
File[] array = file.listFiles();
String fileName;
File fileTemp;
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 1);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
file = new File(saveLocal + "CSM"); //打开CSM
array = file.listFiles();
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 2);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
file = new File(saveLocal + "ZS"); //打开ZS
array = file.listFiles();
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 3);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
}
/**
* 开始执行
* @throws IOException
*/
public void execute() throws IOException{
scan();//开始扫描
}
/**
* 按类型存储
* @param file
* @param type
* @throws IOException
*/
private void saveFile(File file, int type) throws IOException {
String fileName = file.getName();
//类型A C 和 指数3种
String year = fileName.substring(1, 5);//获得发布年份
String date = fileName.substring(5, 9);//获得发布日期包含月日
String var = null;//获得变量名字
String dir = serverLocal;//存储目录名字
if (type == 1 ) {
var = fileName.substring(11, 15);
dir = dir + "AGCM/" + var + "/" + year + "/" + date;
} else if(type == 2) {
var = fileName.substring(11, 15);
dir = dir + "CSM/" + var + "/" + year + "/" + date;
} else {
var = fileName.substring(11, 15);//指数的暂时没处理
dir = dir + "ZS/" + var + "/" + year + "/" + date;
}
//判断是否存在这样的目录没有就自动创建
File savePath = new File(dir);
if(!savePath.exists()) {
savePath.mkdirs();
}
File saveFile = new File(dir + "/" + fileName);
if(!saveFile.exists()){//如果不存在,就存文件
FileInputStream fis = null;//这里用本地复制暂时代替FTP
FileOutputStream fos =null;
BufferedInputStream bis =null;
BufferedOutputStream bos =null;
int c;
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
fos = new FileOutputStream(dir + "/" + fileName);
bos = new BufferedOutputStream(fos);
while((c = bis.read())!= -1)
bos.write(c);
bos.flush();
if(bos != null) bos.close();
if(bis != null) bis.close();
if(fos != null) fos.close();
if(fis != null) fos.close();
} else {
System.out.println("文件已经存在,不进行存储,可清理当前文件.");
}
}
/**
* 测试方法
* @param argv
* @throws IOException
*/
public static void main(String argv[]) {
ScanFtp s = new ScanFtp();
try {
s.scan();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* 自动扫描FTP文件工具类
* 需要定时执行
*/
public class ScanFtp {
//服务器图片路径文件夹
private String serverLocal = "D:/TOOLS/Tomcat 6.0/webapps/BCCCSM/modelforcast/";
//图片上传文件夹存放路径,文件夹内应包含AGCM CSM ZS 3个子文件夹分别存放需要扫描到tomcat中的图片
private String saveLocal = "D:/modelForcast/";
/**
* 获得远程权限
* @return
*/
private void getFTPAdress(){
//登陆成功
}
/**
* 开始扫描
* @throws IOException
*/
private void scan() throws IOException {
this.getFTPAdress();
File file = new File(saveLocal + "AGCM"); //打开AGCM
File[] array = file.listFiles();
String fileName;
File fileTemp;
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 1);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
file = new File(saveLocal + "CSM"); //打开CSM
array = file.listFiles();
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 2);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
file = new File(saveLocal + "ZS"); //打开ZS
array = file.listFiles();
for(int i = 0; i < array.length; i++){
if(array[i].isFile()) {
fileTemp = array[i];
fileName = fileTemp.getName();//取出文件名
if (!fileName.equals("humbs.db")) {
this.saveFile(fileTemp, 3);//分析每一个文件名字并存储
System.out.println(fileName + " saved");
}
}
}
}
/**
* 开始执行
* @throws IOException
*/
public void execute() throws IOException{
scan();//开始扫描
}
/**
* 按类型存储
* @param file
* @param type
* @throws IOException
*/
private void saveFile(File file, int type) throws IOException {
String fileName = file.getName();
//类型A C 和 指数3种
String year = fileName.substring(1, 5);//获得发布年份
String date = fileName.substring(5, 9);//获得发布日期包含月日
String var = null;//获得变量名字
String dir = serverLocal;//存储目录名字
if (type == 1 ) {
var = fileName.substring(11, 15);
dir = dir + "AGCM/" + var + "/" + year + "/" + date;
} else if(type == 2) {
var = fileName.substring(11, 15);
dir = dir + "CSM/" + var + "/" + year + "/" + date;
} else {
var = fileName.substring(11, 15);//指数的暂时没处理
dir = dir + "ZS/" + var + "/" + year + "/" + date;
}
//判断是否存在这样的目录没有就自动创建
File savePath = new File(dir);
if(!savePath.exists()) {
savePath.mkdirs();
}
File saveFile = new File(dir + "/" + fileName);
if(!saveFile.exists()){//如果不存在,就存文件
FileInputStream fis = null;//这里用本地复制暂时代替FTP
FileOutputStream fos =null;
BufferedInputStream bis =null;
BufferedOutputStream bos =null;
int c;
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
fos = new FileOutputStream(dir + "/" + fileName);
bos = new BufferedOutputStream(fos);
while((c = bis.read())!= -1)
bos.write(c);
bos.flush();
if(bos != null) bos.close();
if(bis != null) bis.close();
if(fos != null) fos.close();
if(fis != null) fos.close();
} else {
System.out.println("文件已经存在,不进行存储,可清理当前文件.");
}
}
/**
* 测试方法
* @param argv
* @throws IOException
*/
public static void main(String argv[]) {
ScanFtp s = new ScanFtp();
try {
s.scan();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
邮件发送工具类 SendMail.java
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;
/**
* 邮件发送工具类
*/
public class SendMail {
private String hostName;//设置smtp服务器
private String sendMailAddress;//设置发送地址
private String mailPassword;//设置密码
private boolean TLS = false;//设置是否需要TLS登录
private String[] getMailAddress;//设置接收地址s
private String mailTitle;//设置标题
private String mailContent;//设置邮件内容
public void send(){
SimpleEmail email = new SimpleEmail();
email.setTLS(TLS); //是否TLS校验，，某些邮箱需要TLS安全校验，同理有SSL校验
email.setHostName(hostName);
try {
email.setFrom(sendMailAddress, sendMailAddress);
email.setAuthentication(sendMailAddress, mailPassword);
email.setCharset("utf-8");//解决中文乱码问题
email.setSubject(mailTitle); //标题
email.setMsg(mailContent);//内容
for(int i = 0; i < getMailAddress.length; ++i){
email.addTo(getMailAddress[i]); //接收方
email.send();
}
} catch (EmailException e) {
// e.printStackTrace();
}
}
public String getHostName() {
return hostName;
}
public void setHostName(String hostName) {
this.hostName = hostName;
}
public String getSendMailAddress() {
return sendMailAddress;
}
public void setSendMailAddress(String sendMailAddress) {
this.sendMailAddress = sendMailAddress;
}
public String getMailPassword() {
return mailPassword;
}
public void setMailPassword(String mailPassword) {
this.mailPassword = mailPassword;
}
public boolean isTLS() {
return TLS;
}
public void setTLS(boolean tls) {
TLS = tls;
}
public String[] getGetMailAddress() {
return getMailAddress;
}
public void setGetMailAddress(String[] getMailAddress) {
this.getMailAddress = getMailAddress;
}
public String getMailTitle() {
return mailTitle;
}
public void setMailTitle(String mailTitle) {
this.mailTitle = mailTitle;
}
public String getMailContent() {
return mailContent;
}
public void setMailContent(String mailContent) {
this.mailContent = mailContent;
}
}
package com.util;
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;
/**
* 邮件发送工具类
*/
public class SendMail {
private String hostName;//设置smtp服务器
private String sendMailAddress;//设置发送地址
private String mailPassword;//设置密码
private boolean TLS = false;//设置是否需要TLS登录
private String[] getMailAddress;//设置接收地址s
private String mailTitle;//设置标题
private String mailContent;//设置邮件内容
public void send(){
SimpleEmail email = new SimpleEmail();
email.setTLS(TLS); //是否TLS校验，，某些邮箱需要TLS安全校验，同理有SSL校验
email.setHostName(hostName);
try {
email.setFrom(sendMailAddress, sendMailAddress);
email.setAuthentication(sendMailAddress, mailPassword);
email.setCharset("utf-8");//解决中文乱码问题
email.setSubject(mailTitle); //标题
email.setMsg(mailContent);//内容
for(int i = 0; i < getMailAddress.length; ++i){
email.addTo(getMailAddress[i]); //接收方
email.send();
}
} catch (EmailException e) {
// e.printStackTrace();
}
}
public String getHostName() {
return hostName;
}
public void setHostName(String hostName) {
this.hostName = hostName;
}
public String getSendMailAddress() {
return sendMailAddress;
}
public void setSendMailAddress(String sendMailAddress) {
this.sendMailAddress = sendMailAddress;
}
public String getMailPassword() {
return mailPassword;
}
public void setMailPassword(String mailPassword) {
this.mailPassword = mailPassword;
}
public boolean isTLS() {
return TLS;
}
public void setTLS(boolean tls) {
TLS = tls;
}
public String[] getGetMailAddress() {
return getMailAddress;
}
public void setGetMailAddress(String[] getMailAddress) {
this.getMailAddress = getMailAddress;
}
public String getMailTitle() {
return mailTitle;
}
public void setMailTitle(String mailTitle) {
this.mailTitle = mailTitle;
}
public String getMailContent() {
return mailContent;
}
public void setMailContent(String mailContent) {
this.mailContent = mailContent;
}
}
分页工具类 SharePager.java
/**
* 分页工具类
*
*/
public class SharePager {
private int totalRows; //总行数
private int pageSize = 20; //每页显示的行数
private int currentPage; //当前页号
private int totalPages; //总页数
private int startRow; //当前页在数据库中的起始行
/**
* 默认构造函数
*/
public SharePager()
{
}
/**默认每页10行
* @param totalRows
*/
public SharePager(int totalRows)
{
this.totalRows = totalRows;
totalPages =(int) Math.ceil((double)totalRows / (double)pageSize);
startRow = 0;
}
/**可自定义每页显示多少页
* @param totalRows
* @param pageSize
*/
public SharePager(int totalRows, int pageSize)
{
this.totalRows = totalRows;
this.pageSize = pageSize;
if(this.pageSize<1)
this.pageSize=1;
else if(pageSize>20)
this.pageSize=20;
// if(this.pageSize>totalRows){
// this.pageSize=(int)totalRows;
// }
totalPages =(int) Math.ceil((double)totalRows / (double)this.pageSize);
currentPage = 1;
startRow = 0;
}
/**
* 跳转到首页
*/
public void first()
{
this.currentPage = 1;
this.startRow = 0;
}
/**
* 跳转到上一页
*/
public void previous()
{
if (currentPage == 1)
{
return;
}
currentPage--;
startRow = (currentPage-1) * pageSize;
}
/**
* 跳转到下一页
*/
public void next()
{
if (currentPage < totalPages)
{
currentPage++;
}
startRow = (currentPage-1) * pageSize;
}
/**
* 跳转到尾页
*/
public void last()
{
this.currentPage = totalPages;
if(currentPage<1){
currentPage = 1;
}
this.startRow = (currentPage-1) * this.pageSize;
totalPages =(int) Math.ceil((double)totalRows / (double)this.pageSize);
}
/**
* 跳转到指定页
* @param currentPage 指定的页
*/
public void refresh(int currentPage)
{
if(currentPage < 0)
{
first();
}
if (currentPage > totalPages)
{
last();
}else{
this.currentPage = currentPage;
this.startRow = (currentPage-1) * this.pageSize;
}
}
public int getStartRow()
{
return startRow;
}
public int getTotalPages()
{
return totalPages;
}
public int getCurrentPage()
{
return currentPage;
}
public int getPageSize()
{
return pageSize;
}
public void setTotalRows(int totalRows)
{
this.totalRows = totalRows;
}
public void setStartRow(int startRow)
{
this.startRow = startRow;
}
public void setTotalPages(int totalPages)
{
this.totalPages = totalPages;
}
public void setCurrentPage(int currentPage)
{
this.currentPage = currentPage;
}
public void setPageSize(int pageSize)
{
this.pageSize = pageSize;
}
public int getTotalRows()
{
return totalRows;
}
}
资料转自http://blog.csdn.net/justdb/article/details/8653166