Java多线程下载文件.pdf

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[置顶] Java多线程下载文件
分类: JAVA基础 2012-02-29 00:19 529人阅读评论(8) 收藏举报
文件下载采用多线程方式能够充分利用CPU资源,关键点是设置线程的读取开
始和结束位置。下面的代码,采用线程池启动10个线程来执行下载。
import ;
import ;
import ;
import .HttpURLConnection;
import .URL;
import .URLConnection;
import ;
import ;
import ;
public class FileDownLoadTest {
private static final int TCOUNT = 10;
private CountDownLatch latch = new CountDownLatch(TCOUNT);
private pleteLength = 0;
private long fileLength;
/**
* ***@param args
* ***@throws Exception
*/
public static void main(String[] args) throws Exception {
new FileDownLoadTest().download("http://localhost:8080/test/");
}
public void download(String address) throws Exception{
ExecutorService service = (TCOUNT);
URL url = new URL(address);
= ();
("Referer", "");
fileLength = ();
long packageLength = fileLength/TCOUNT;
long leftLength = fileLength%TCOUNT;
essFile file = new essFile("d:\\","rw");
//计算每个线程请求文件的开始和结束位置
long pos = 0;
long endPos = pos + packageLength;
for(int i=0; i<TCOUNT; i++){
if(leftLength >0){
endPos ++;
leftLength--;
}