spring+springmvc實現websoket1

用註解@ServerEndpoint(“/websocket”)

1. 兩種方法實現代碼地址(包含相關jar包) :http://pan.baidu.com/s/1dF2ElVV 密碼：8x6x
   方法1：用註解@ServerEndpoint(“/websocket”)
   方法2：spring-websocket-4.3.6.RELEASE.jar實現
2. 註解@ServerEndpoint(“/websocket”)實現websoket(實現定時向瀏覽器發送定時任務)
   配置文件applicationContext-java.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.1.xsd">


    <bean name="monitor" class="com.spring.java.websocket.Monitor" lazy-init="false"   init-method="sendMsg"></bean>
    </beans>

Monitor類

package com.spring.java.websocket;
import com.spring.java.websocket.WebSocketTest;

import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;


public class Monitor implements Runnable {


    @Override
    public void run() {
        WebSocketTest webSocketTest = new WebSocketTest();
        webSocketTest.sendMsg("當前時間:" + new Date());
    }

    public void sendMsg() {
        ScheduledExecutorService newScheduledThreadPool = Executors.newSingleThreadScheduledExecutor();
        newScheduledThreadPool.scheduleWithFixedDelay(new Monitor(), 20, 5, TimeUnit.SECONDS);
    }
}

測試類WebSocketTest

package com.spring.java.websocket;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;


/**
 * @ServerEndpoint 註解是一個類層次的註解，它的功能主要是將目前的類定義成一個websocket服務器端,
 * 註解的值將被用於監聽用戶連接的終端訪問URL地址,客戶端可以通過這個URL來連接到WebSocket服務器端
 * @author uptop
 */
@ServerEndpoint("/websocket")
public class WebSocketTest {
    //靜態變量，用來記錄當前在線連接數。應該把它設計成線程安全的。
    private static int onlineCount = 0;

    //concurrent包的線程安全Set，用來存放每個客戶端對應的MyWebSocket對象。若要實現服務端與單一客戶端通信的話，可以使用Map來存放，其中Key可以爲用戶標識
    public static CopyOnWriteArraySet<WebSocketTest> webSocketSet = new CopyOnWriteArraySet<WebSocketTest>();

    //與某個客戶端的連接會話，需要通過它來給客戶端發送數據
    private Session session;

    /**
     * 連接建立成功調用的方法
     *
     * @param session 可選的參數。session爲與某個客戶端的連接會話，需要通過它來給客戶端發送數據
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在線數加1
        System.out.println("有新連接加入！當前在線人數爲" + getOnlineCount());
    }

    /**
     * 連接關閉調用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //從set中刪除
        subOnlineCount();           //在線數減1
        System.out.println("有一連接關閉！當前在線人數爲" + getOnlineCount());
    }

    /**
     * 收到客戶端消息後調用的方法
     *
     * @param message 客戶端發送過來的消息
     * @param session 可選的參數
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("來自客戶端的消息:" + message);
        //羣發消息
        for (WebSocketTest item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
                continue;
            }
        }
    }

    /**
     * 發生錯誤時調用
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("發生錯誤");
        error.printStackTrace();
    }

    /**
     * 這個方法與上面幾個方法不一樣。沒有用註解，是根據自己需要添加的方法。
     *
     * @param message
     * @throws IOException
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);

    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketTest.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketTest.onlineCount--;
    }


    public void sendMsg(String msg) {
        for (WebSocketTest item : webSocketSet) {
            try {
                item.sendMessage(msg);
            } catch (IOException e) {
                e.printStackTrace();
                continue;
            }
        }
    }


}

index.jsp文件

<%@ page language="java" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>spring-javawebsoket</title>
</head>
<body>
    Welcome<br/><input id="text" type="text"/>
    <button onclick="send()">發送消息</button>
    <hr/>
    <button onclick="closeWebSocket()">關閉WebSocket連接</button>
    <hr/>
    <div id="message"></div>
    <table id="tb" class="altrowstable">
        <th align="center"  colspan="9">實時信息監控</th>
    </table>
</body>
<script type="text/javascript" src="js/jqueryV2.2.3.min.js"></script>
<script type="text/javascript">
    var websocket = null;
    //判斷當前瀏覽器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:8082/websoket_test/websocket");
    }
    else {
        alert('當前瀏覽器 Not support websocket')
    }

    //連接發生錯誤的回調方法
    websocket.onerror = function () {
        setMessageInnerHTML("WebSocket連接發生錯誤");
    };

    //連接成功建立的回調方法
    websocket.onopen = function () {
        setMessageInnerHTML("WebSocket連接成功");
    }

    //接收到消息的回調方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

    //連接關閉的回調方法
    websocket.onclose = function () {
        setMessageInnerHTML("WebSocket連接關閉");
    }

    //監聽窗口關閉事件，當窗口關閉時，主動去關閉websocket連接，防止連接還沒斷開就關閉窗口，server端會拋異常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

    //將消息顯示在網頁上
    function setMessageInnerHTML(innerHTML) {
        var msg=innerHTML.split(" - ")

        var table=document.getElementById("tb");

         var row;
         row=table.insertRow(1);
        for(var i=0;i<msg.length;i++){
             var cell = row.insertCell(i);
             cell.appendChild(document.createTextNode(msg[i]));
        }
        if(table.rows.length>50){
            table.deleteRow(table.rows.length-1);
        }
      //  document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //關閉WebSocket連接
    function closeWebSocket() {
        websocket.close();
    }

    //發送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>

web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <!-- jave websoket -->
        <!-- 
               測試地址:http://localhost:8082/websoket_test/index.jsp
        <param-value>classpath:applicationContext-java.xml</param-value>
         -->
         <!-- 測試地址:http://localhost:8082/websoket_test/websocket/login.action?username=ddd -->
         <param-value>classpath:applicationContext-java.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>
    <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.action</url-pattern>
  </servlet-mapping>
    <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>*.action</url-pattern>
  </filter-mapping>
</web-app>

3.訪問地址：http://localhost:8082/websoket_test/index.jsp