SpringBoot WebSocket配合react 使用消息通信

引入websocket依赖

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

配置websocket

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;@Configuration
@EnableWebSocket
public class WebSocketConfig {@Beanpublic ServerEndpointExporter serverEndpoint() {return new ServerEndpointExporter();} }

websocket核心代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;@Component
@ServerEndpoint("/socket")
public class WebSocketServer {private static final Logger LOGGER = LoggerFactory.getLogger(WebSocketServer.class);private ConcurrentHashMap<String, Session> sessionMap = new ConcurrentHashMap(8);/*** 连接成功* @param session*/@OnOpenpublic void onOpen(Session session) {sessionMap.put(session.getId(), session);String queryString = session.getQueryString();LOGGER.info("session id is {}", session.getId());LOGGER.info("queryString is {}", queryString);LOGGER.info("setup connection success userId is {}", session.getId());try {sendMessage(session, "cxk");} catch (IOException e) {throw new RuntimeException(e);}}/*** 连接关闭** @param session*/@OnClosepublic void onClose(Session session) {System.out.println("连接关闭");}/*** 接收到消息** @param text*/@OnMessagepublic void onMsg(String text, Session session) throws IOException {LOGGER.info("get message {}", text);}/*** 实现服务器主动推送*/public void sendMessage(Session session, String message) throws IOException {session.getBasicRemote().sendText(message);}@OnErrorpublic void onError(Session session, Throwable throwable) {LOGGER.error("get error");}}

react 前端部分代码

import React, {useEffect, useState} from 'react';//	这里不要使用 import 或者 require 引入，否则报错useEffect(() => {const webSocket: WebSocket = new WebSocket('ws://localhost:8777/socket')webSocket.onopen = () => {console.log('ws onopen');webSocket.send('from client: hello');};webSocket.onmessage = (e) => {console.log('ws onmessage');console.log('from server: ' + e.data);};}, [])