java一个简单的下载功能分享
最近闲来无事，所以写了一个java的下载模块，稍微修改了一下弄成了无限下载。
首先是线程类：
package com.gzh.test;import java.io.BufferedInputStream;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import java.net.HttpURLConnection;import java.net.URL;public class DownloadThread extends Thread {private String url = null;private String file = null;private long offset = 0;private long length = 0;public DownloadThread(String url, String file, long offset, long length) {this.url = url;this.file = file;this.offset = offset;this.length = length;}@Overridepublic void run() {try {HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();conn.setRequestMethod("GET");conn.setRequestProperty("RANGE", "bytes=" + this.offset + "-"+ (this.offset + this.length - 1));BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());byte[] buf = new byte[1024];int bytesRead;while ((bytesRead = bis.read(buf, 0, buf.length)) != -1) {this.writeFile(file, offset, buf, bytesRead);this.offset += bytesRead;}} catch (IOException e) {e.printStackTrace();}}public void writeFile(String fileName, long offset, byte[] bytes,int realLength) throws IOException {File file = new File(fileName);RandomAccessFile raf = new RandomAccessFile(file, "rw");raf.seek(offset);raf.write(bytes, 0, realLength);raf.close();}}?然后随便写一个类实现main():
while循环是个死循环，每隔10秒运行一次线程。
?
package com.gzh.test;import java.io.File;public class Main {public static void main(String[] args) {String url = "http://d2.eoemarket.com/upload/apps/2013/0607/148237/apks/07c73b70-9cbf-4a7f-eeb7-1f8b35e24cd1.apk";int a = 0;while (true) {String file = "D:\\javaTest\" + System.currentTimeMillis()+ ".apk";long offset = 0;long length = 0;new DownloadThread(url, file, offset, length).start();try {Thread.sleep(15000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(a++);}}}?灰常无聊啊，只是希望初学者能够掌握简单的java单线程下载。最后推荐一款IT学习软件“IT视频排行榜”，绿色健康小清新呦，地址→http://www.eoemarket.com/soft/148237.html