HttpURLConnection类的保持session会话

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TestServlet.javapackage nj.servlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class TestServlet extends HttpServlet {    public void doPost(HttpServletRequest request,HttpServletResponse response){        HttpSession session=request.getSession();        String str=(String)session.getAttribute("name");        System.out.println("name:"+str);        session.setAttribute("name", "nj");        /*String ss=request.getHeader("Cookie");        System.out.println("session id:"+ss);*/    }    public void doGet(HttpServletRequest request,HttpServletResponse response){        this.doPost(request, response);    }} TestServlet.javapackage nj.ws.test;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;import java.util.Map;import java.util.Set;public class TestConnection {        public static void main(String[] args){        //第一次连接，返回session id        String sessionId=testUrlConnection();        //第二次使用session id连接        connectionBySession(sessionId);    }        public static String testUrlConnection(){        String urlStr="Http://localhost:8080/WebServiceProject/testServlet";        OutputStream out=null;        InputStream in=null;        try {            URL url=new URL(urlStr);            HttpURLConnection con=(HttpURLConnection)url.openConnection();            con.setRequestMethod("POST");                        //打印请求头信息            Map hfs=con.getHeaderFields();            Set<String> keys=hfs.keySet();            for(String str:keys){                List<String> vs=(List)hfs.get(str);                System.out.print(str+":");                for(String v:vs){                    System.out.print(v+"\t");                }                System.out.println();            }            System.out.println("-----------------------");            String cookieValue=con.getHeaderField("Set-Cookie");            System.out.println("cookie value:"+cookieValue);            String sessionId=cookieValue.substring(0, cookieValue.indexOf(";"));            return sessionId;        } catch (Exception e) {            e.printStackTrace();            return null;        }finally{            try {                if(in!=null)                    in.close();                if(out!=null)                    out.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }        public static void connectionBySession(String sessionId){        InputStream in=null;        try{            String url="Http://localhost:8080/WebServiceProject/testServlet";            URL u=new URL(url);            HttpURLConnection con=(HttpURLConnection)u.openConnection();            con.setRequestMethod("POST");            con.setRequestProperty("Cookie", sessionId);            in=con.getInputStream();        }catch(Exception e){            e.printStackTrace();        }finally{            try {                if(in!=null)                    in.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

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

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