socket實現java聊天室，公告等功能，前後端分離（附源碼）

 pom文件

<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

 application.yml中端口設置

server:
  port: 11112

 

 下面是代碼

package com.websocket.demo.websocket;

import org.junit.jupiter.api.Test;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;

import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author lzy
 * @Date 2019/8/14 9:44
 * @Version 1.0
 * @name 創建處理器
 */
public class WebSocketPushHandler extends TextWebSocketHandler {
    private static final List<WebSocketSession> USER_LIST = new ArrayList<>();

    /**
     * 用戶進入系統監聽
     */
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("3.用戶進入系統。。。");
        System.out.println("用戶信息:" + session.getAttributes());
        Map<String, Object> map = session.getAttributes();
        for (String key : map.keySet()) {
            System.out.println("key:" + key + " and value:" + map.get(key));
        }
        USER_LIST.add(session);
    }

    /**
     * 處理用戶請求
     */
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        System.out.println("系統處理xxx用戶的請求信息。。。");
        System.out.println("===>>> 當前系統用戶數爲:"+USER_LIST.size());
        System.out.println("用戶所發送消息爲："+message.getPayload() );
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("----------------"+ LocalTime.now() +"----------------");
        stringBuilder.append("<h3>當前系統在線用戶數爲:"+USER_LIST.size()+"</h3><br/><br/>");
        stringBuilder.append("<h4>用戶"+session.getAttributes().get("userId")+"：</h4><br/>");
        stringBuilder.append("<h5>"+message.getPayload()+"</h5><br/>");
        TextMessage textMessage = new TextMessage(stringBuilder.toString());
        //向所有用戶廣播消息
        sendMessagesToUsers(textMessage);
    }

    /**
     * 用戶退出後的處理
     */
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        if (session.isOpen()) {
            session.close();
        }
        System.out.println("===>>> 退出系統時用戶數爲:"+USER_LIST.size());
        USER_LIST.remove(session);
        System.out.println(session.getAttributes().get("userId")+"xxx用戶退出系統。。。");
    }

    /**
     * 自定義函數
     * 給所有的在線用戶發送消息
     */
    public static  void sendMessagesToUsers(TextMessage message) {
        for (WebSocketSession user : USER_LIST) {
            try {
                // isOpen()在線就發送
                if (user.isOpen()) {
                    StringBuilder stringBuilder = new StringBuilder();
                    stringBuilder
                            .append("######################################## <br/>")
                            .append("&nbsp;&nbsp;&nbsp;&nbsp;").append(LocalDateTime.now()).append("<br/>")
                            .append("[用戶] <br/>")
                            .append(message.getPayload()).append("<br/>")
                            .append("######################################## <br/>");
                    TextMessage textMessage = new TextMessage(stringBuilder);
                    user.sendMessage(textMessage);
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println(e.getLocalizedMessage());
            }
        }
    }

    /**
     * 自定義函數
     * 發送消息給指定的在線用戶
     */
    public static void sendMessageToUser(String userId, TextMessage message) {
        for (WebSocketSession user : USER_LIST) {
            if (user.getAttributes().get("userId").equals(userId)) {
                try {
                    // isOpen()在線就發送
                    if (user.isOpen()) {
                        StringBuilder stringBuilder = new StringBuilder();
                        stringBuilder
                                .append("######################################## <br/>")
                                .append("&nbsp;&nbsp;&nbsp;&nbsp;").append(LocalDateTime.now()).append("<br/>")
                                .append("[用戶] <br/>")
                                .append(message.getPayload()).append("<br/>")
                                .append("######################################## <br/>");
                        TextMessage textMessage = new TextMessage(stringBuilder);
                        user.sendMessage(textMessage);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println(e.getLocalizedMessage());
                }
            }
        }
    }

    @Test
    public void Test(List<WebSocketSession> USER_LIST){
        for (WebSocketSession user : USER_LIST) {
            System.out.println(user);
        }
    }

}

package com.websocket.demo.websocket;

import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;

import java.util.Map;

/**
 * @author lzy
 * @Date 2019/8/14 9:41
 * @Version 1.0
 * @name 創建握手 此類用來獲取登錄用戶信息並交由websocket管理
 * @Description HandshakeInterceptor WebSocket握手請求的攔截器. 檢查握手請求和響應, 對WebSocketHandler傳遞屬性
 */
public class MyWebSocketInterceptor implements HandshakeInterceptor {

    /**
     * 在握手之前執行該方法, 繼續握手返回true, 中斷握手返回false. 通過attributes參數設置WebSocketSession的屬性
     */
    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        System.out.println("1.用戶建立連接。。。");
        if (request instanceof ServletServerHttpRequest) {
            String userId = ((ServletServerHttpRequest) request).getServletRequest().getParameter("userId");
            attributes.put("userId", userId);
            System.out.println("用戶唯一標識:" + userId);
        }
        return true;
    }

    /**
     * 在握手之後執行該方法. 無論是否握手成功都指明瞭響應狀態碼和相應頭.
     */
    @Override
    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,Exception exception) {
        System.out.println("2.在握手之後執行該方法. 無論是否握手成功都指明瞭響應狀態碼和相應頭");
    }
}

package com.websocket.demo.config;

import com.websocket.demo.websocket.MyWebSocketInterceptor;
import com.websocket.demo.websocket.WebSocketPushHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
import org.springframework.web.socket.server.HandshakeInterceptor;

/**
 * @author lzy
 * @Date 2019/8/14 9:47
 * @Version 1.0
 * @name websocket配置類
 */
@Configuration
@EnableWebSocket
public class WebSocketConfig  implements WebSocketConfigurer {
    /**
     * 註冊WebSocket處理類
     */
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        System.out.println("註冊WebSocket處理類");
        registry.addHandler(createWebSocketPushHandler(), "/webSocketServer")
                .addInterceptors(createHhandshakeInterceptor()).setAllowedOrigins("*");
        registry.addHandler(createWebSocketPushHandler(), "/sockjs/webSocketServer")
                .addInterceptors(createHhandshakeInterceptor()).withSockJS();
    }

    /**
     *
     * @Title: createHhandshakeInterceptor
     * @Description: 握手攔截器
     * @return
     */
    @Bean
    public HandshakeInterceptor createHhandshakeInterceptor() {
        System.out.println("握手攔截器");
        return new MyWebSocketInterceptor();
    }

    /**
     *
     * @Title: createWebSocketPushHandler
     * @Description: 處理類
     * @return
     */
    @Bean
    public WebSocketHandler createWebSocketPushHandler() {
        System.out.println("處理類");
        return new WebSocketPushHandler();
    }
}

package com.websocket.demo.controller;

import com.websocket.demo.websocket.WebSocketPushHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;

/**
 * @author lzy
 * @Date 2019/8/14 14:51
 * @Version 1.0
 * @name
 */
@RestController
@RequestMapping("/msg")
public class MsgController {

    /**
     * 功能描述:向全體廣播消息
     * @param: [msg] 消息內容
     * @return: boolean
     * @auther: lzy
     * @date: 2019/8/14 16:10
     */
    @PostMapping("/sendMsg")
    public boolean sendMsg(String msg){
        System.out.println("全體廣播消息 ["+msg+"]");
        TextMessage textMessage = new TextMessage(msg);
        try{
            WebSocketPushHandler.sendMessagesToUsers(textMessage);
        }catch (Exception e){
            return false;
        }
        return true;
    }

    /**
     * 功能描述:向指定用戶發送消息
     * @param msg 消息內容
     * @param userId 用戶編號
     * @return: boolean
     * @auther: lzy
     * @date: 2019/8/14 16:13
     */
    @PostMapping("/sendMsgByUser")
    public boolean sendMsgByUser(String msg,String userId){
        System.out.println("向 "+userId+" 發送消息，消息內容爲:"+msg);
        TextMessage textMessage = new TextMessage(msg);
        try{
            WebSocketPushHandler.sendMessageToUser(userId,textMessage);
        }catch (Exception e){
            return false;
        }
        return true;
    }
}

頁面代碼 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Java後端WebSocket的Tomcat實現</title>
</head>
<body>
Welcome<br/><label for="text"></label><input id="text" type="text"/>
<button οnclick="send()">發送消息</button>
<hr/>
<button οnclick="closeWebSocket()">關閉WebSocket連接</button>
<hr/>
<div id="message"></div>
</body>

<script type="text/javascript">
    let websocket = null;
    //判斷當前瀏覽器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:11112/webSocketServer?userId=user1"+new Date().getTime());
    }
    else {
        alert('當前瀏覽器不支持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) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

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

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

源碼下載鏈接：https://download.csdn.net/download/qq_39187822/11546600