package com.cmc.test;import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;/*** 使用多线程下载防盗链图片* * @author chenmc* @date 2017年8月30日 下午2:39:23*/
public class DownloadPicture {public static void main(String[] args) throws InterruptedException {for (int i = 1; i <= 10; i++) {int n = i;Thread t = new Thread(){@Overridepublic synchronized void run() {try {httpRequest(n);} catch (Exception e) {e.printStackTrace();}super.run();}};t.start();}}/*** 发起http请求* * @author chenmc* @date 2017年8月30日 下午2:36:09* @param n* @throws Exception*/public static void httpRequest(int n) throws Exception {for (int i = (n-1)*5 > 1 ? (n-1)*5 : 1; i < n*5; i++) { long startTime = System.currentTimeMillis();String path = "C:/Users/admin/Pictures/壁纸/" + String.format("%03d", i) + ".jpg";//这里url写你想要下载图片的urlString uri = String.format("http://bizhi.xxx.com/rluo/%s.jpg", String.format("%03d", i));System.out.println(uri);URL url = new URL(uri);  HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestProperty("referer", "http://bizhi.xxx.com"); //这是破解防盗链添加的参数conn.setRequestMethod("GET");  conn.setConnectTimeout(5 * 1000);  InputStream inStream = conn.getInputStream();//通过输入流获取图片数据readInputStream(inStream, path);//得到图片的二进制数据，并保存long endTime = System.currentTimeMillis();System.out.println(path + "--耗时：" + (endTime-startTime)/1000 + "s");}}/*** 保存图片* * @author chenmc* @date 2017年8月30日 下午2:35:54* @param inStream* @param path* @throws Exception*/public static void readInputStream(InputStream inStream, String path) throws Exception{  FileOutputStream fos = new FileOutputStream(new File(path));byte[] buffer = new byte[102400];  int len = 0;  while( (len=inStream.read(buffer)) != -1 ){  fos.write(buffer, 0, len);  }  inStream.close();  fos.flush();fos.close();}
}