java 多线程文件拷贝_Java多线程实现文件copy | 学步园

package com.file.study;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FilenameFilter;

import java.sql.Timestamp;

public class DirClass {

public static void main(String args[]) throws Exception{

File srcDir = new File("java");

if(!(srcDir.exists() && srcDir.isDirectory()))

throw new Exception("directory not exit");

File[] files = srcDir.listFiles(new FilenameFilter() {

public boolean accept(File dir, String name) {

return name.endsWith(".java");

}

});

System.out.println(files.length);

File destDir = new File("jad");

if(!(destDir.exists())) {

destDir.mkdir();

}

System.out.println( new Timestamp(System.currentTimeMillis()));

/*每个文件启动一个线程*/

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

/*

FileInputStream fis = new FileInputStream(files[i]);

String destFileName = files[i].getName().replaceAll("\\.java$", ".jad");

FileOutputStream fos = new FileOutputStream(new File(destDir, destFileName));

copy(fis,fos);

fis.close();

fos.close();

*/

Copy c = new Copy(files[i]);

c.start();

}

System.out.println( new Timestamp(System.currentTimeMillis()));

}

/*

private static void copy(FileInputStream ips, FileOutputStream ops) throws Exception {

int len = 0;

byte[] buf = new byte[1024];

while((len = ips.read(buf)) != -1) {

ops.write(buf,0,len);

}

}

*/

}

class Copy extends Thread {

private File ifile;

private File destDir;

public Copy(File ips) {

this.destDir = new File("test");

if(!(destDir.exists())) {

destDir.mkdir();

}

this.ifile = ips;

}

public Copy() {

}

public void run() {

FileInputStream fis = null;

FileOutputStream fos = null;

try {

fis = new FileInputStream(ifile);

String destFileName = ifile.getName().replaceAll("\\.java$", ".jad");

fos = new FileOutputStream(new File(destDir, destFileName));

int len = 0;

byte[] buf = new byte[1024];

while((len = fis.read(buf)) != -1) {

fos.write(buf,0,len);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

fis.close();

fos.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}