WebSocket消息推送(群發和指定到個人)


1.客戶端:  HTML

<!DOCTYPE html>
<html>
<head>
    <title>Java后端WebSocket的Tomcat實現</title>
</head>
<body>
    Welcome<br/><input id="text" type="text"/>
    <button onclick="send()">發送消息</button>
    <hr/>
    <!--userno:發送消息人的編號-->
    <div id="userno">1234</div>
    <button onclick="closeWebSocket()">關閉WebSocket連接</button>
    <hr/>
    <div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;
    var userno=document.getElementById('userno').innerHTML;
    //判斷當前瀏覽器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:8899/websocket/"+userno);
    }
    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(sendMessage) {
        document.getElementById('message').innerHTML += sendMessage + '<br/>';
    }

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

    //發送消息
    function send() {
        var message = document.getElementById('text').value;//要發送的消息內容
        var now=getNowFormatDate();//獲取當前時間
        document.getElementById('message').innerHTML += (now+"發送人:"+userno+'<br/>'+"---"+message) + '<br/>';
        document.getElementById('message').style.color="red";
        var ToSendUserno="4567";//接收人編號:4567
        message=message+"|"+ToSendUserno//將要發送的信息和內容拼起來,以便於服務端知道消息要發給誰
        websocket.send(message);
    }
    //獲取當前時間
    function getNowFormatDate() {
        var date = new Date();
        var seperator1 = "-";
        var seperator2 = ":";
        var month = date.getMonth() + 1;
        var strDate = date.getDate();
        if (month >= 1 && month <= 9) {
            month = "0" + month;
        }
        if (strDate >= 0 && strDate <= 9) {
            strDate = "0" + strDate;
        }
        var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
                + " " + date.getHours() + seperator2 + date.getMinutes()
                + seperator2 + date.getSeconds();
        return currentdate;
} 
</script>
</html>

2.服務端:

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example.websocket</groupId>
	<artifactId>websocketdemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>websocketdemo</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-messaging</artifactId>
		</dependency>
		<!--添加websocket依賴-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-websocket</artifactId>
			<version>1.3.5.RELEASE</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

 java實體類:

WebSocketTest
package com.example.websocket.websocketdemo;


import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @ServerEndpoint 注解是一個類層次的注解,它的功能主要是將目前的類定義成一個websocket服務器端,
 * 注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
 * @ServerEndpoint 可以把當前類變成websocket服務類
 */
@ServerEndpoint("/websocket/{userno}")
@Component
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可以為用戶標識
    private static ConcurrentHashMap<String, WebSocketTest> webSocketSet = new ConcurrentHashMap<String, 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;
    //當前發消息的人員編號
    private String userno = "";

    /**
     * 連接建立成功調用的方法
     *
     * @param session 可選的參數。session為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(@PathParam(value = "userno") String param, Session session, EndpointConfig config) {
        System.out.println(param);
        userno = param;//接收到發送消息的人員編號
        this.session = session;
        webSocketSet.put(param, this);//加入map中
        addOnlineCount();           //在線數加1
        System.out.println("有新連接加入!當前在線人數為" + getOnlineCount());
    }

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

    /**
     * 收到客戶端消息后調用的方法
     *
     * @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);
//        session.get
        //群發消息
        if (1 < 2) {
            sendAll(message);
        } else {
            //給指定的人發消息
            sendToUser(message);
        }
    }

    /**
     * 給指定的人發送消息
     * @param message
     */
    private void sendToUser(String message) {
        String sendUserno = message.split("[|]")[1];
        String sendMessage = message.split("[|]")[0];
        String now = getNowTime();
        try {
            if (webSocketSet.get(sendUserno) != null) {
                webSocketSet.get(sendUserno).sendMessage(now + "用戶" + userno + "發來消息:" + " <br/> " + sendMessage);
            } else {
                System.out.println("當前用戶不在線");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 給所有人發消息
     * @param message
     */
    private void sendAll(String message) {
        String now = getNowTime();
        String sendMessage = message.split("[|]")[0];
        //遍歷HashMap
        for (String key : webSocketSet.keySet()) {
            try {
                //判斷接收用戶是否是當前發消息的用戶
                if (!userno.equals(key)) {
                    webSocketSet.get(key).sendMessage(now + "用戶" + userno + "發來消息:" + " <br/> " + sendMessage);
                    System.out.println("key = " + key);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    /**
     * 獲取當前時間
     *
     * @return
     */
    private String getNowTime() {
        Date date = new Date();
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time = format.format(date);
        return time;
    }
    /**
     * 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。沒有用注解,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);
        //this.session.getAsyncRemote().sendText(message);
    }

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

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

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


}
WebSocketConfig
package com.example.websocket.websocketdemo;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

SpringBoot啟動類:

package com.example.websocket.websocketdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class WebsocketdemoApplication extends SpringBootServletInitializer implements EmbeddedServletContainerCustomizer {

    public static void main(String[] args) {
        SpringApplication.run(WebsocketdemoApplication.class, args);
    }

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.setPort(8899);//設置服務端口為8899
    }

}

 

源碼下載地址:http://download.csdn.net/download/zb18829224773/10121298(導入直接可以跑)

 


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