针对某些场景下，面对服务文件大，或者服务端服务器不稳定时使用该模块。功能代码如下：

 

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class MultiFileDownLoad {    private static int position = 0;    public static void doDownLoad(String url){        File targetFile=new File(MultiFileDownLoad.class.getResource("").getFile());        targetFile=targetFile.getParentFile();        targetFile=targetFile.getParentFile();        targetFile=targetFile.getParentFile();        targetFile=targetFile.getParentFile();        targetFile=new File(targetFile.getAbsolutePath()+File.separator+ System.currentTimeMillis()+".wmv");        if(!targetFile.exists()){            try {                targetFile.createNewFile();            } catch (IOException e) {                e.printStackTrace();            }        }        //File targetFile=new File("D://video.wmv");        writeFile(url,targetFile);    }    private static InputStream getInputStream(String url,long startPosition){        InputStream inputStream=null;        HttpURLConnection conn=null;        try {            URL filePath=new URL(url);            conn= (HttpURLConnection) filePath.openConnection();            conn.setConnectTimeout(3*1000);            //防止屏蔽程序抓取而返回403错误            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            long contentLength=conn.getContentLengthLong();            if(startPosition