使用HttpURLConnection类（利用sessionId保持会话
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:nullname: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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