批处理 使用500个线程并发下载远程文件

工程包文件：commons-io-1.1.jar、config.properties、download.jar、start.bat

说明：借助Apache Commons IO工具包（commons-io-1.1.jar）来简单实现文件（夹）的复制、移动、删除、获取大小等操作

config.properties 文件内容：

#远程服务器下载url
remoteUrl=http://localhost:8080/test/download/a.mp3
#下载文件保存位置如F:\download
saveFileUrl=F
#并发下载线程数
threadNums=10

start.bat文件内容：

set classpath=download.jar;commons-io-1.1.jar
java FileSave

pause

download.jar 文件主class文件源码：

import java.io.File;
import java.net.URL;
import java.util.Random;

import org.apache.commons.io.FileUtils;

public class FileSave
{
static String remoteUrl = "http://192.168.100.15:8080/myweb/001232.mp3";
static String saveFileUrl = "D:/download/";

public static void main(String[] args)
{
for (int i = 0; i < 500; i++)
{
new Thread(new myThread(remoteUrl, saveFileUrl)).start();
}
}

}

class myThread implements Runnable
{
int NUM = 1;

String remoteUrl = "";
String saveFileUrl = "";

public myThread(String remoteUrl, String saveFileUrl)
{
this.remoteUrl = remoteUrl;
this.saveFileUrl = saveFileUrl;
}

public void run()
{
downloadFromUrl(remoteUrl, saveFileUrl);
}

/**
* 文件下载的方法
*/
public static String downloadFromUrl(String url, String dir)
{
String fileName = "";

try
{
URL httpurl = new URL(url);
String[] us = url.split("/");
fileName = us[us.length - 1];
String ramdom = System.currentTimeMillis() + ""
+ new Random().nextInt(100);
fileName = ramdom + "_" + fileName;
System.out.println("fileName:" + fileName);
File f = new File(dir + fileName);
FileUtils.copyURLToFile(httpurl, f);
} catch (Exception e)
{
e.printStackTrace();
return "Fault!";
}

return fileName;
}

}