java ---讲一个文件复制到另一个文件

java 将一个文件复制到另一个目录下

2012-08-03 16:29:31| 分类: Java|订阅

**

* 复制单个文件

* @param oldPath String 原文件路径 如:c:/fqf.txt

* @param newPath String 复制后路径 如:f:/fqf.txt

* @return boolean

*/

public void copyFile(String oldPath, String newPath) {

try {

int bytesum = 0;

int byteread = 0;

File oldfile = new File(oldPath);

if (oldfile.exists()) { //文件存在时

InputStream inStream = new FileInputStream(oldPath); //读入原文件

FileOutputStream fs = new FileOutputStream(newPath);

byte[] buffer = new byte[1444];

int length;

while ( (byteread = inStream.read(buffer)) != -1) {

bytesum += byteread; //字节数 文件大小

System.out.println(bytesum);

fs.write(buffer, 0, byteread);

}

inStream.close();

}

} catch (Exception e) {

System.out.println("复制单个文件操作出错");

e.printStackTrace();

}

}

/**

* 复制整个文件夹内容

* @param oldPath String 原文件路径 如:c:/fqf

* @param newPath String 复制后路径 如:f:/fqf/ff

* @return boolean

*/

public void copyFolder(String oldPath, String newPath) {

try {

(new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹

File a=new File(oldPath);

String[] file=a.list();

File temp=null;

for (int i = 0; i < file.length; i++) {

if(oldPath.endsWith(File.separator)){

temp=new File(oldPath+file[i]);

}

else{

temp=new File(oldPath+File.separator+file[i]);

}

if(temp.isFile()){

FileInputStream input = new FileInputStream(temp);

FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString());

byte[] b = new byte[1024 * 5];

int len;

while ( (len = input.read(b)) != -1) {

output.write(b, 0, len);

}

output.flush();

output.close();

input.close();

}

if(temp.isDirectory()){ //如果是子文件夹

copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);

}

}

} catch (Exception e) {

System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

}