服務端代碼：

WebSocketConfig代碼

package org.example.hufamessagedemo;import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.*;@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {@Overridepublic void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {registry.addHandler(new MessageHandler(), "/ws").setAllowedOrigins("*"); // 允許所有客戶端跨域連接}
}

MessageHandler代碼

package org.example.hufamessagedemo;import org.springframework.web.socket.*;
import org.springframework.web.socket.handler.TextWebSocketHandler;import java.util.concurrent.CopyOnWriteArrayList;public class MessageHandler extends TextWebSocketHandler {private static final CopyOnWriteArrayList<WebSocketSession> sessions = new CopyOnWriteArrayList<>();@Overridepublic void afterConnectionEstablished(WebSocketSession session) {sessions.add(session);System.out.println("新客戶端連接: " + session.getId());}@Overrideprotected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {System.out.println("收到消息: " + message.getPayload());// 廣播給所有客戶端for (WebSocketSession s : sessions) {if (s.isOpen()) {s.sendMessage(new TextMessage("用戶" + session.getId() + ": " + message.getPayload()));}}}@Overridepublic void afterConnectionClosed(WebSocketSession session, CloseStatus status) {sessions.remove(session);System.out.println("客戶端斷開: " + session.getId());}
}

HufamessagedemoApplication代碼

package org.example.hufamessagedemo;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class HufamessagedemoApplication {public static void main(String[] args) {SpringApplication.run(HufamessagedemoApplication.class, args);}}

pom.xml代碼如下：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.5.5</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>org.example</groupId><artifactId>hufamessagedemo</artifactId><version>0.0.1-SNAPSHOT</version><name>hufamessagedemo</name><description>hufamessagedemo</description><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>17</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

客戶端代碼：

DemoApplication代碼

package com.example.demo;import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketHttpHeaders;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.client.WebSocketClient;
import org.springframework.web.socket.client.standard.StandardWebSocketClient;
import org.springframework.web.socket.handler.TextWebSocketHandler;import java.net.URI;@SpringBootApplication
public class DemoApplication implements CommandLineRunner{public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}@Overridepublic void run(String... args) throws Exception {WebSocketClient client = new StandardWebSocketClient();WebSocketHandler handler = new TextWebSocketHandler() {@Overridepublic void afterConnectionEstablished(WebSocketSession session) throws Exception {System.out.println("? 已連接到服務端");session.sendMessage(new TextMessage("你好，我是客戶端！"));}@Overrideprotected void handleTextMessage(WebSocketSession session, TextMessage message) {System.out.println("📩 收到服務端消息: " + message.getPayload());}};WebSocketHttpHeaders headers = new WebSocketHttpHeaders();// 這里傳 handler、headers、URIWebSocketSession session = client.execute(handler, headers, URI.create("ws://localhost:8080/ws")).get();// 再發一條消息session.sendMessage(new TextMessage("第二條消息 from client"));}
}

pom.xml代碼如下：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.5.5</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>org.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>demo</description><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>17</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-websocket</artifactId></dependency><dependency><groupId>org.glassfish.tyrus.bundles</groupId><artifactId>tyrus-standalone-client</artifactId><version>2.1.3</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

客戶端端口8081，服務端端口8080.

效果圖：