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1.简单的实现了聊天室功能，注意页面刷新后聊天记录不会保存，后端没有做消息的持久化
2.后端用户的识别只简单使用Session用户的身份
0.依赖
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency>1.配置WebSocketConfigurer配置类
package com.example.config;import org.springframework.context.annotation.Configuration;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.server.HandshakeInterceptor;import javax.servlet.http.HttpSession;
import java.util.Map;@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfigurer implements WebSocketMessageBrokerConfigurer {@Overridepublic void configureMessageBroker(MessageBrokerRegistry config) {config.enableSimpleBroker("/topic");config.setApplicationDestinationPrefixes("/app");}@Overridepublic void registerStompEndpoints(StompEndpointRegistry registry) {registry.addEndpoint("/ws").withSockJS().setInterceptors(new HttpHandshakeInterceptor());}public class HttpHandshakeInterceptor implements HandshakeInterceptor {@Overridepublic boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response,WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {if (request instanceof ServletServerHttpRequest) {ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;HttpSession session = servletRequest.getServletRequest().getSession(false);if (session != null) {//使用session中的userString user = (String) session.getAttribute("user");if(user!=null){attributes.put("user", user);}}}return true;}@Overridepublic void afterHandshake(ServerHttpRequest request, ServerHttpResponse response,WebSocketHandler wsHandler, Exception exception) { }}}2.MessageHandler用于处理接收消息
package com.example.webController;import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;import javax.servlet.http.HttpSession;@Controller
public class MessageHandler {@MessageMapping("/chat")@SendTo("/topic/messages")public String chat(@PathVariable("messages") String message, SimpMessageHeaderAccessor headerAccessor) {// 获取用户数据Object user = headerAccessor.getSessionAttributes().get("user");System.out.println("User: " + user);return user.toString()+":" + message;}//登录@GetMapping("login/{userName}")public void login(@PathVariable String userName, HttpSession session) {System.out.println("User " + userName);session.setAttribute("user", userName);}
}3.前端页面
先登录后发送消息
4.前端代码
<!DOCTYPE html>
<html>
<head><title>WebSocket Demo</title><script src="https://cdn.jsdelivr.net/npm/sockjs-client/dist/sockjs.min.js"></script><script src="https://cdn.jsdelivr.net/npm/stompjs/lib/stomp.min.js"></script><style>#chatBox {width: 60%;margin: auto;height: 500px;border: 1px solid black;padding: 10px;border-radius: 7px;}.chat-message {height: 85%;overflow: auto;}.flex-row, .flex-row-reverse {display: flex;justify-content: space-between;padding: 10px 0;}.message {max-width: 60%;padding: 10px;border-radius: 10px;}.user {background-color: #7986cb;color: white;}.assistant {background-color: #ffe082;}#inputMessage {width: 80%;padding: 10px;border-radius: 10px;border: 1px solid black;margin-top: 10px;}#sendButton {width: 15%;margin-left: 5%;padding: 11px;background-color: #ff7043;color: white;border: none;border-radius: 10px;cursor: pointer;}</style>
</head>
<body>
<div id="chat"><div id="chatBox"><div class="chat-message"><div class="flex-row"><div class="message user"><p>Hello</p></div></div><div class="flex-row-reverse"><div class="message assistant"><p>Hi, How can I help you?</p></div></div></div><input type="text" id="inputMessage" placeholder="Type message.." /><button id="sendButton" onclick="send()">Send</button></div><input type="text" id="login" placeholder="输入用户名。。。" /><button onclick="login()">Login</button></div>
<script>var socket = new SockJS('/ws');var stompClient = Stomp.over(socket);stompClient.connect({}, function(frame) {stompClient.subscribe('/topic/messages', function(message) {var div = document.createElement('div');div.className = "flex-row-reverse";var messageDiv = document.createElement('div');messageDiv.className = "message assistant";var p = document.createElement('p');p.textContent = message.body;messageDiv.appendChild(p);div.appendChild(messageDiv);document.querySelector('.chat-message').appendChild(div);});});function login() {var value = document.getElementById('login').value;//发送get请求fetch('/login/' + value)//刷新页面window.location.reload();}function send() {var inputValue = document.getElementById('inputMessage').value;var div = document.createElement('div');div.className = "flex-row";// var messageDiv = document.createElement('div');// messageDiv.className = "message user";// var p = document.createElement('p');// p.textContent = inputValue;// messageDiv.appendChild(p);// div.appendChild(messageDiv);document.querySelector('.chat-message').appendChild(div);stompClient.send("/app/chat", {}, inputValue);document.getElementById('inputMessage').value = '';}
</script>
</body>
</html>