jms

http://blog.csdn.net/zhangxs_3/archive/2009/03/29/4034788.aspx

 

http://docs.sun.com/app/docs/doc/820-4610/abdbo?l=zh&a=view

 

jms-activemq

 

import java.io.IOException;
import java.io.PrintWriter;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;

public class MessageReceiveServlet extends HttpServlet { //接收消息

 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
   doPost(req,resp);
 }
 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
   ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");  
         HttpSession httpsession=req.getSession(); 
         String userName=(String)httpsession.getAttribute("userName");
         //创建一个Queue  
       //  Queue queue = new ActiveMQQueue("testQueue");  
   Queue queue = new ActiveMQQueue(userName);
         //创建一个Session  
         try{
           Connection connection = factory.createConnection();  
           connection.start();  
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);  
         //注册消费者1  
         MessageConsumer comsumer1 = session.createConsumer(queue);  
         comsumer1.setMessageListener(new MessageListener(){ 
          
             public void onMessage(Message m) { 
                 try {  
                     System.out.println("Consumer1 get " + ((TextMessage)m).getText());  
                     //out.println("Message: "+" --"+((TextMessage)m).getText());
                 } catch (JMSException e) {  
                     e.printStackTrace();  
                 }  
             }  
         });  
        /* MessageConsumer comsumer = session.createConsumer(queue);//反应太慢
         Message recvMessage = comsumer.receive();
         System.out.println(((TextMessage)recvMessage).getText());*/
         }catch(JMSException e){
          e.printStackTrace();
         }
 }
}

public class MessageSendServlet extends HttpServlet { //发送消息

 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
   doPost(req,resp);
 }

 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
  String receiveName=req.getParameter("receiveName");  //zw
  String content=req.getParameter("content");
   ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");  
   try{
         Connection connection = factory.createConnection();  
         connection.start();  
        // Queue queue = new ActiveMQQueue("testQueue");   //里面的字符，和接收的是一样的，才能一对一的获取消息
       Queue queue=new ActiveMQQueue(receiveName);     //一般是用户名，必须唯一
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);  
         MessageProducer producer = session.createProducer(queue);  
         producer.setDeliveryMode(DeliveryMode.PERSISTENT); 

                   //就算用户不在线，只要服务器不关闭，发送的消息就存在，一上线就会出来
         producer.send(session.createTextMessage(content)); 
        // producer.send(session.createTextMessage("A persistent Message"));  
        // producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);   //发送一个non persistent消息, 而刚好这个时候没有消费者在监听, 这个消息也会丢失
        // producer.send(session.createTextMessage("A non persistent Message"));  
         producer.close();
         session.close();
         connection.close();
   }
   catch(JMSException e){
    e.printStackTrace();
   }
         System.out.println("Send messages sucessfully!");  
         resp.sendRedirect("index.jsp");
 }
}

 

有个问题：就是如何让消息显示出来？在后台，消息一发送，另一用户能知道。但是在MessageListener监听器中不能传递消息，只知道有消息了。