Servlet實現控制文件下載速度

  long speed =1024*100L;//限制下載速度為100k/s,
        long current=0;
        ServletOutputStream out = resp.getOutputStream();


    File file =new File("xxxxxx");
    FileInputStream in = new FileInputStream(file);
    byte[]temp=new byte[1024];
    int i;
    long startTime=System.currentTimeMillis();
    while((i=in.read(temp))!=-1){
        current=current+i;
        out.write(temp);
        if(current>speed){
            startPause(startTime+1000);
            current=0;
            startTime=System.currentTimeMillis();
        }
    }
    in.close();
}

private void startPause(long time){
    while(true){
        if(System.currentTimeMillis()>time){
            break;
        }
    }
} </pre><br />