Java 小程序 实现网络下载图片到制定文件夹，压缩和删除文件
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class Mytest extends Thread {
public volatile static boolean exit =false;
public static void main(String args[]) throws IOException, InterruptedException {
final String fname = "C:/Users/Administrator/Desktop/img";
final String fname2 = "C:/Users/Administrator/Desktop/img/";
final String fname1 = "C:/Users/Administrator/Desktop";
Mytest thread = new Mytest();
createDir(fname);
final String[] url = {
"http://4493bz.1985t.com/uploads/allimg/150127/4-15012G52133.jpg",
"http://img4.duitang.com/uploads/item/201408/19/20140819121630_hv3FP.gif",
"http://img1.imgtn.bdimg.com/it/u=4090372236,3427938161&fm=21&gp=0.jpg",
"http://img4.imgtn.bdimg.com/it/u=996240150,1058761816&fm=21&gp=0.jpg",
"http://i2.w.yun.hjfile.cn/doc/201304/f011e054c6734c3d88aace7fe7497758.gif",
"http://img4.imgtn.bdimg.com/it/u=819201812,3553302270&fm=23&gp=0.jpg" };
ExecutorService pool = Executors.newFixedThreadPool(6);
for (int i = 0; i < url.length; i++) {
final int index = i;
pool.execute(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
//此方法实现图片的下载
download(url[index], "第" + index + "图片", fname, index);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
String img = "img";
boolean flag = Mytest.fileToZip(fname, fname1, img);
if (flag) {
System.out.println("文件打包成功!");
} else {
System.out.println("文件打包失败!");
}
thread.sleep(5000);
thread.exit=true;
File file = new File(fname);
deleteAllFilesOfDir(file);
}
//此方法实现文件夹的删除
public static void deleteAllFilesOfDir(File path) {
if (!path.exists())
return;
if (path.isFile()) {
path.delete();
return;
}
File[] files = path.listFiles();
for (int i = 0; i < files.length; i++) {
deleteAllFilesOfDir(files[i]);
System.out.println("删除图片" + files[i]);
}
path.delete();
}
//此方法实现文件夹的压缩
public static boolean fileToZip(String sourceFilePath, String zipFilePath,
String fileName) {
boolean flag = false;
File sourceFile = new File(sourceFilePath);
FileInputStream fis = null;
BufferedInputStream bis = null;
FileOutputStream fos = null;
ZipOutputStream zos = null;
if (sourceFile.exists() == false) {
System.out.println("待压缩的文件目录：" + sourceFilePath + "不存在.");
} else {
try {
File zipFile = new File(zipFilePath + "/" + fileName + ".zip");
if (zipFile.exists()) {
System.out.println(zipFilePath + "目录下存在名字为:" + fileName
+ ".zip" + "打包文件.");
} else {
File[] sourceFiles = sourceFile.listFiles();
if (null == sourceFiles || sourceFiles.length < 1) {
System.out.println("待压缩的文件目录：" + sourceFilePath
+ "里面不存在文件，无需压缩.");
} else {
fos = new FileOutputStream(zipFile);
zos = new ZipOutputStream(new BufferedOutputStream(fos));
byte[] bufs = new byte[1024 * 10];
for (int i = 0; i < sourceFiles.length; i++) {
// 创建ZIP实体，并添加进压缩包
ZipEntry zipEntry = new ZipEntry(
sourceFiles[i].getName());
zos.putNextEntry(zipEntry);
// 读取待压缩的文件并写进压缩包里
fis = new FileInputStream(sourceFiles[i]);
bis = new BufferedInputStream(fis, 1024 * 10);
int read = 0;
while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
zos.write(bufs, 0, read);
}
}
flag = true;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new RuntimeException(e);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
// 关闭流
try {
if (null != bis)
bis.close();
if (null != zos)
zos.close();
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
return flag;
}
//此方法实现图片下载
protected static void download(String url, String string, String fname,
int index) throws IOException {
// TODO Auto-generated method stub
URL u = new URL(url);
URLConnection con = u.openConnection();
System.out.println("开始下载第" + index + " 图片");
try {
con.setConnectTimeout(20 * 1000);
con.setReadTimeout(10 * 1000);
} catch (Exception e) {
System.out.println("第" + index + "下载失败");
}
try {
InputStream is = con.getInputStream();
byte[] bs = new byte[1024];
int len;
File sf = new File(fname);
if (!sf.exists()) {
sf.mkdir();
} else {
System.out.println("下载失败");
}
OutputStream os = new FileOutputStream(sf.getPath() + "\\" + string);
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
System.out.println("下载第" + index + "图片完成");
os.close();
is.close();
} catch (Exception e) {
// TODO: handle exception
}
}
//此方法实现文件夹得创建
public static boolean createDir(String fname) {
File dir = new File(fname);
if (dir.exists()) {
System.out.println("创建目录" + fname + "失败，目标目录已存在！");
return false;
}
// 判断字符串是否以‘/’作为分隔符
if (!fname.endsWith(File.separator))
fname = fname + File.separator;
// 创建单个目录
if (dir.mkdirs()) {
System.out.println("创建目录" + fname + "成功！");
return true;
} else {
System.out.println("创建目录" + fname + "成功！");
return false;
}
}
}