使用HttpURLConnection类（利用sessionId保持会话

TestServlet.java

1. package nj.servlet;
3. import javax.servlet.http.HttpServlet;
4. import javax.servlet.http.HttpServletRequest;
5. import javax.servlet.http.HttpServletResponse;
6. import javax.servlet.http.HttpSession;
8. public class TestServlet extends HttpServlet {
9.     public void doPost(HttpServletRequest request,HttpServletResponse response){
10.         HttpSession session=request.getSession();
11.         String str=(String)session.getAttribute("name");
12.         System.out.println("name:"+str);
13.         session.setAttribute("name", "nj");
14.         /*String ss=request.getHeader("Cookie");
15.         System.out.println("session id:"+ss);*/
16.     }
17.     public void doGet(HttpServletRequest request,HttpServletResponse response){
18.         this.doPost(request, response);
19.     }
20. }

 

TestServlet.java

1. package nj.ws.test;
3. import java.io.IOException;
4. import java.io.InputStream;
5. import java.io.OutputStream;
6. import java.net.HttpURLConnection;
7. import java.net.URL;
8. import java.util.List;
9. import java.util.Map;
10. import java.util.Set;
12. public class TestConnection {
13.     
14.     public static void main(String[] args){
15.         //第一次连接，返回session id
16.         String sessionId=testUrlConnection();
17.         //第二次使用session id连接
18.         connectionBySession(sessionId);
19.     }
20.     
21.     public static String testUrlConnection(){
22.         String urlStr="Http://localhost:8080/WebServiceProject/testServlet";
23.         OutputStream out=null;
24.         InputStream in=null;
25.         try {
26.             URL url=new URL(urlStr);
27.             HttpURLConnection con=(HttpURLConnection)url.openConnection();
28.             con.setRequestMethod("POST");
29.             
30.             //打印请求头信息
31.             Map hfs=con.getHeaderFields();
32.             Set<String> keys=hfs.keySet();
33.             for(String str:keys){
34.                 List<String> vs=(List)hfs.get(str);
35.                 System.out.print(str+":");
36.                 for(String v:vs){
37.                     System.out.print(v+"\t");
38.                 }
39.                 System.out.println();
40.             }
41.             System.out.println("-----------------------");
42.             String cookieValue=con.getHeaderField("Set-Cookie");
43.             System.out.println("cookie value:"+cookieValue);
44.             String sessionId=cookieValue.substring(0, cookieValue.indexOf(";"));
45.             return sessionId;
46.         } catch (Exception e) {
47.             e.printStackTrace();
48.             return null;
49.         }finally{
50.             try {
51.                 if(in!=null)
52.                     in.close();
53.                 if(out!=null)
54.                     out.close();
55.             } catch (IOException e) {
56.                 e.printStackTrace();
57.             }
58.         }
59.     }
60.     
61.     public static void connectionBySession(String sessionId){
62.         InputStream in=null;
63.         try{
64.             String url="Http://localhost:8080/WebServiceProject/testServlet";
65.             URL u=new URL(url);
66.             HttpURLConnection con=(HttpURLConnection)u.openConnection();
67.             con.setRequestMethod("POST");
68.             con.setRequestProperty("Cookie", sessionId);
69.             in=con.getInputStream();
70.         }catch(Exception e){
71.             e.printStackTrace();
72.         }finally{
73.             try {
74.                 if(in!=null)
75.                     in.close();
76.             } catch (IOException e) {
77.                 e.printStackTrace();
78.             }
79.         }
80.     }
81. }

运行后打印结果：

Web服务端：

name:null
name:nj

 

测试类打印：

null:HTTP/1.1 200 OK 
Content-Length:0 
Set-Cookie:JSESSIONID=7827696933343BC5005E5244369CB2A8; Path=/WebServiceProject 
Date:Mon, 01 Dec 2008 03:16:30 GMT 
Server:Apache-Coyote/1.1 
-----------------------
cookie value:JSESSIONID=7827696933343BC5005E5244369CB2A8; Path=/WebServiceProject