其實 關鍵就是 header中 的 Referer 屬性，可以通過firebug 檢視頭資訊 並獲得Referer，但有些情況下可能不能獲取，就只能通過抓包的方法來獲得了。

1. import java.io.BufferedInputStream;  
2. import java.io.BufferedOutputStream;  
3. import java.io.BufferedReader;  
4. import java.io.File;  
5. import java.io.FileOutputStream;  
6. import java.io.InputStreamReader;  
7. import java.net.HttpURLConnection;  
8. import java.net.URL;  
9. publicclass refererPost {  
10.     publicstaticvoid main(String[] args){  
11.         String urls = "http://113.107.42.72:88/images/uploadimg/rw201209231804.jpg";  
12.         URL url = null;  
13.         HttpURLConnection http = null;  
14.         try {  
15.             url = new
     URL(urls);  
16.             http = (HttpURLConnection) url.openConnection();  
17.             http.setDoInput(true);  
18.             http.setDoOutput(true);  
19.             http.setUseCaches(false);  
20.             http.setConnectTimeout(50000);  
21.             http.setReadTimeout(50000);  
22.             http.setRequestMethod("GET"
    );  
23.             http.setRequestProperty("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");  
24.             http.setRequestProperty("Accept-Encoding", "gzip");    
25.             http.setRequestProperty("Referer", "http://dmm.hk/");    
26.             String param = "zs=dddddddddddddddddd";  
27.             //http.getOutputStream().write(param.getBytes());    
28.             //http.getOutputStream().flush();
29.             //http.getOutputStream().close();
30.             System.out.println("getResponseCode====="+http.getResponseCode());  
31.             if (http.getResponseCode() == 200) {  
32.                 File f = new File("D://a.jpg");  
33.                 System.out.println("111111111111111111111111111111");  
34.                 BufferedInputStream in = new BufferedInputStream(  
35.             http.getInputStream());  
36.             int c = 0;  
37.             BufferedOutputStream b = new BufferedOutputStream(new FileOutputStream(f));  
38.             while((c=in.read())!=-1){  
39.                 b.write(c);  
40.                 b.flush();  
41.             }  
42.             b.close();  
43.             in.close();  
44.             }  
45.         } catch (Exception e) {  
46.             System.out.println("err");  
47.         } finally {  
48.         if (http != null)  
49.             http.disconnect();  
50.         }  
51.     }  
52.     }  

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


public class refererPost {
	public static void main(String[] args){
		String urls = "http://113.107.42.72:88/images/uploadimg/rw201209231804.jpg";
		URL url = null;
		HttpURLConnection http = null;
		try {
			url = new URL(urls);
			http = (HttpURLConnection) url.openConnection();
			http.setDoInput(true);
			http.setDoOutput(true);
			http.setUseCaches(false);
			http.setConnectTimeout(50000);
			http.setReadTimeout(50000);
			http.setRequestMethod("GET");
			http.setRequestProperty("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");
			http.setRequestProperty("Accept-Encoding", "gzip");  
			http.setRequestProperty("Referer", "http://dmm.hk/");  
			String param = "zs=dddddddddddddddddd";
			//http.getOutputStream().write(param.getBytes());    
			//http.getOutputStream().flush();
			//http.getOutputStream().close();
			System.out.println("getResponseCode====="+http.getResponseCode());
			if (http.getResponseCode() == 200) {
				File f = new File("D://a.jpg");
				System.out.println("111111111111111111111111111111");
				BufferedInputStream in = new BufferedInputStream(
			http.getInputStream());
			int c = 0;
			BufferedOutputStream b = new BufferedOutputStream(new FileOutputStream(f));
			while((c=in.read())!=-1){
				b.write(c);
				b.flush();
			}
			
			b.close();
			in.close();
			}
		} catch (Exception e) {
			System.out.println("err");
		} finally {
		if (http != null)
			http.disconnect();
		}
	}
	}