java httpurlconnection 发送cookie时,cookie要在Post前发送

1. public InputStream getStream(URL url,String post,URL cookieurl){  
2.         HttpURLConnection connection;  
3.         String cookieVal = null;  
4.         String sessionId = “”;  
5.         String key=null;  
6.         if(cookieurl!=null){              
7.             try{  
8.                 connection = (HttpURLConnection)cookieurl.openConnection();  
9.                 for (int i = 1; (key = connection.getHeaderFieldKey(i)) != null; i++ ) {  
10.                     if (key.equalsIgnoreCase(“set-cookie”)) {  
11.                         cookieVal = connection.getHeaderField(i);  
12.                         cookieVal = cookieVal.substring(0, cookieVal.indexOf(“;”));  
13.                         sessionId = sessionId+cookieVal+“;”;  
14.                     }  
15.                 }  
16.                 InputStream in = connection.getInputStream();  
17.                 System.out.println(sessionId);  
18.             }catch(MalformedURLException e){  
19.                 System.out.println(“url can’t connection”);  
20.                 return null;  
21.             }catch(IOException e){  
22.                 System.out.println(e.getMessage());  
23.                 return null;  
24.             }  
25.         }  
26.   
27.         try {  
28.             connection = (HttpURLConnection)url.openConnection();  
29.             //这个要写在Post前,否则会取不到值,原因我不知道  
30.             if(cookieurl!=null){  
31.                 connection.setRequestProperty(“Cookie”, sessionId);  
32.             }  
33.             if(post!=“”){  
34.                 connection.setDoOutput(true);  
35.                 connection.setRequestMethod(“POST”);  
36.                 connection.getOutputStream().write(post.getBytes());  
37.                 connection.getOutputStream().flush();  
38.                 connection.getOutputStream().close();  
39.             }  
40.             int responseCode = connection.getResponseCode();  
41.             int contentLength = connection.getContentLength();  
42.             // System.out.println(“Content length: “+contentLength);  
43.             if (responseCode != HttpURLConnection.HTTP_OK ) return(null);  
44.             InputStream in = connection.getInputStream();  
45.             return(in);  
46.         }  
47.         catch(Exception e) {  
48.             // System.out.println(e);  
49.             // e.printStackTrace();  
50.             return(null);  
51.         }  
52.           
53.     }  

转自：http://stephenjqj.javaeye.com/blog/477194