介绍MyEclipse集成Tomcat7，并开发WebSocket的全过程

1.首先使MyEclipse8.6集成Tomcat7

注意配置参数

注意jar包

主机JDK版本

2.开发WebSocket

导入websocket-api.jar

开发java文件

package com.chen.websocket;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
 
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
 
@ServerEndpoint("/websocket")
public class MyWebSocket {
    private static int onlineCount = 0;
     
    private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();
     
    private Session session;

    @OnOpen
    public void onOpen(Session session){
        this.session = session;
        webSocketSet.add(this);    
        addOnlineCount();           
        System.out.println("aaaΪ" + getOnlineCount());
    }
     

    @OnClose
    public void onClose(){
        webSocketSet.remove(this);  
        subOnlineCount();               
        System.out.println("bbbbΪ" + getOnlineCount());
    }
     
 
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("ttt" + message);
         

        for(MyWebSocket item: webSocketSet){             
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
                continue;
            }
        }
    }

    @OnError
    public void onError(Session session, Throwable error){
        System.out.println("yy");
        error.printStackTrace();
    }
     

    public void sendMessage(String message) throws IOException{
        this.session.getBasicRemote().sendText(message);
        //this.session.getAsyncRemote().sendText(message);
    }
 
    public static synchronized int getOnlineCount() {
        return onlineCount;
    }
 
    public static synchronized void addOnlineCount() {
        MyWebSocket.onlineCount++;
    }
     
    public static synchronized void subOnlineCount() {
        MyWebSocket.onlineCount--;
    }
}
开发JSP
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML>
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My WebSocket</title>
  </head>
   
  <body>
    Welcome<br/>
    <input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>
    <div id="message">
    </div>
  </body>
   
  <script type="text/javascript">
      var websocket = null;
       
      //判断当前浏览器是否支持WebSocket
      if('WebSocket' in window){
          websocket = new WebSocket("ws://localhost:8080/MyWebSocket/websocket");
      }
      else{
          alert('Not support websocket')
      }
       
      //连接发生错误的回调方法
      websocket.onerror = function(){
          setMessageInnerHTML("error");
      };
       
      //连接成功建立的回调方法
      websocket.onopen = function(event){
          setMessageInnerHTML("open");
      }
       
      //接收到消息的回调方法
      websocket.onmessage = function(){
          setMessageInnerHTML(event.data);
      }
       
      //连接关闭的回调方法
      websocket.onclose = function(){
          setMessageInnerHTML("close");
      }
       
      //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
      window.onbeforeunload = function(){
          websocket.close();
      }
       
      //将消息显示在网页上
      function setMessageInnerHTML(innerHTML){
          document.getElementById('message').innerHTML += innerHTML + '<br/>';
      }
       
      //关闭连接
      function closeWebSocket(){
          websocket.close();
      }
       
      //发送消息
      function send(){
          var message = document.getElementById('text').value;
          websocket.send(message);
      }
  </script>
</html>


3.部署


部署完之后需要在部署文件下删除websocket-api.jar，因为tomcat7已经有




 


4.运行项目















 


 






            

            
posted @ 
2016-10-04 10:19 
liuhg 
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