你好! 这片文章将教会你从后端springCloud到前端VueEleementAdmin如何搭建Websocket
// my-js-file.js
import { Notification } from 'element-ui'
// 暴露自定义websocket对象
export const socket = {
// 后台请求路径
url: '',
websocketCount: -1,
// websocket对象
websocket: null,
// websocket状态
websocketState: false,
// 重新连接次数
reconnectNum: 0,
// 重连锁状态,保证重连按顺序执行
lockReconnect: false,
// 定时器信息
timeout: null,
clientTimeout: null,
serverTimeout: null,
// 初始化方法,根据url创建websocket对象封装基本连接方法,并重置心跳检测
initWebSocket(newUrl) {
socket.url = newUrl
socket.websocket = new WebSocket(socket.url)
socket.websocket.onopen = socket.websocketOnOpen
socket.websocket.onerror = socket.websocketOnError
socket.websocket.onmessage = socket.webonmessage
socket.websocket.onclose = socket.websocketOnClose
this.resetHeartbeat()
},
reconnect() {
// 判断连接状态
console.log('判断连接状态')
if (socket.lockReconnect) return
socket.reconnectNum += 1
// 重新连接三次还未成功调用连接关闭方法
if (socket.reconnectNum === 3) {
socket.reconnectNum = 0
socket.websocket.onclose()
return
}
// 等待本次重连完成后再进行下一次
socket.lockReconnect = true
// 5s后进行重新连接
socket.timeout = setTimeout(() => {
socket.initWebSocket(socket.url)
socket.lockReconnect = false
}, 5000)
},
// 重置心跳检测
resetHeartbeat() {
socket.heartbeat()
},
// 心跳检测
heartbeat() {
socket.clientTimeout = setTimeout(() => {
if (socket.websocket) {
// 向后台发送消息进行心跳检测
socket.websocket.send(JSON.stringify({ type: 'heartbeat' }))
socket.websocketState = false
// 一分钟内服务器不响应则关闭连接
socket.serverTimeout = setTimeout(() => {
if (!socket.websocketState) {
socket.websocket.onclose()
console.log('一分钟内服务器不响应则关闭连接')
} else {
this.resetHeartbeat()
}
}, 60 * 1000)
}
}, 3 * 1000)
},
// 发送消息
sendMsg(message) {
socket.websocket.send(message)
},
websocketOnOpen(event) {
// 连接开启后向后台发送消息进行一次心跳检测
socket.sendMsg(JSON.stringify({ type: 'heartbeat' }))
},
// 初始化websocket对象
// window.location.host获取ip和端口,
// process.env.VUE_APP_WEBSOCKET_BASE_API获取请求前缀
// 绑定接收消息方法
webonmessage(event) {
// 初始化界面时,主动向后台发送一次消息,获取数据
this.websocketCount += 1
if (this.websocketCount === 0) {
const queryCondition = {
type: 'message'
}
socket.sendMsg(JSON.stringify(queryCondition))
console.log('初始化界面时,主动向后台发送一次消息,获取数据')
}
const info = JSON.parse(event.data)
switch (info.type) {
case 'heartbeat':
socket.websocketState = true
console.log(JSON.stringify(info))
break
case 'message':
if (info.message === '物资管理模块-导入成功!') {
Notification({
title: '消息',
message: '物资管理模块-导入成功,请手动刷新页面查看数据!',
type: 'success',
duration: 0,
position: 'top-righ'
})
} else {
Notification({
title: '消息',
message: '错了:' + info.message,
type: 'error',
duration: 0,
position: 'top-righ'
})
}
break
case 'error':
console.log('websocket:error')
break
}
},
websocketOnError(error) {
console.log(error)
console.log('websocket报错了' + error)
socket.reconnect()
},
websocketOnClose() {
console.log('websocke他关闭了')
socket.websocket.close()
}
}
this. s o c k e t . i n i t W e b S o c k e t ( ‘ w s : socket.initWebSocket( `ws: socket.initWebSocket(‘ws:{process.env.VUE_APP_WEBSOCKET_BASE_API}/websocket/` + this.loginForm.username
) 这句是开启websocket连接的。
// 登录方法
handleLogin() {
this.$refs.loginForm.validate(valid => {
if (valid) {
this.loading = true
this.$store.dispatch('user/login', this.loginForm)
.then(() => {
this.$router.push({ path: this.redirect || '/', query: this.otherQuery })
this.$store.dispatch('user/addInfomation', this.infoMation)
this.$socket.initWebSocket(
`ws:${process.env.VUE_APP_WEBSOCKET_BASE_API}/websocket/` + this.loginForm.username
)
this.loading = false
})
.catch(() => {
this.loading = false
})
} else {
console.log('error submit!!')
return false
}
})
},
if (socket.websocketState === false) {
socket.initWebSocket(
`ws:${process.env.VUE_APP_WEBSOCKET_BASE_API}/websocket/` + localStorage.getItem('USERNAME')
)
}
this.$socket.websocketOnClose()这句是关闭websocket连接的
logout() {
await this.$store.dispatch('user/logout')
// 重点
this.$socket.websocketOnClose()
this.$router.push(`/login?redirect=${this.$route.fullPath}`)
}
重点和需要配置的地方都在websocket.js里比如接收消息方法webonmessage
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-websocketartifactId>
dependency>
package com.szc.material.analysisService.confg.WebSocket;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketConfig {
/**
* 注入ServerEndpointExporter,
* 这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
*/
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
package com.szc.material.analysisService.confg.WebSocket;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import javax.security.auth.message.MessageInfo;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* @author zhj
* @ServerEndpoint:将目前的类定义成一个websocket服务器端,注解的值将被用于监听用户连接的终端访问URL地址,客户端可以通过这个URL来连接到WebSocket服务器端
* @OnOpen:当WebSocket建立连接成功后会触发这个注解修饰的方法。
* @OnClose:当WebSocket建立的连接断开后会触发这个注解修饰的方法。
* @OnMessage:当客户端发送消息到服务端时,会触发这个注解修改的方法。
* @OnError:当WebSocket建立连接时出现异常会触发这个注解修饰的方法。
* ————————————————
* 版权声明:本文为CSDN博主「人人都在发奋」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
* 原文链接:https://blog.csdn.net/qq991658923/article/details/127022522
*/
@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")
public class MyWebSocketHandler extends TextWebSocketHandler {
/**
* 线程安全的无序的集合
*/
private static final CopyOnWriteArraySet<Session> SESSIONS = new CopyOnWriteArraySet<>();
/**
* 存储在线连接数
*/
private static final Map<String, Session> SESSION_POOL = new HashMap<>();
@OnOpen
public void onOpen(Session session, @PathParam(value = "userId") String userId) {
try {
SESSIONS.add(session);
SESSION_POOL.put(userId, session);
log.info("【WebSocket消息】有新的连接,总数为:" + SESSIONS.size());
} catch (Exception e) {
e.printStackTrace();
}
}
@OnClose
public void onClose(Session session,@PathParam(value = "userId") String userId) {
try {
SESSIONS.remove(session);
SESSION_POOL.remove(userId);
log.info("【WebSocket消息】连接断开,总数为:" + SESSION_POOL.size());
} catch (Exception e) {
e.printStackTrace();
}
}
@OnMessage
public void onMessage(String message, @PathParam(value = "userId") String userId) {
JSONObject jsonObject = JSON.parseObject(message);
if("heartbeat".equals(jsonObject.get("type").toString())){
Map<String,String> messageInfor=new HashMap<>();
messageInfor.put("type","heartbeat");
messageInfor.put("message","我收到了你的心跳");
sendOneMessage( userId,messageInfor);
log.info("【WebSocket消息】收到客户端消息:" + message);
}
}
/**
* 此为广播消息
*
* @param message 消息
*/
public void sendAllMessage(String message) {
log.info("【WebSocket消息】广播消息:" + message);
for (Session session : SESSIONS) {
try {
if (session.isOpen()) {
session.getAsyncRemote().sendText(message);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 此为单点消息
*
* @param userId 用户编号
* @param message 消息
*/
public void sendOneMessage(String userId, Map<String,String> message) {
Session session = SESSION_POOL.get(userId);
if (session != null && session.isOpen()) {
try {
synchronized (session) {
log.info("【WebSocket消息】单点消息:" + message.get("message"));
session.getAsyncRemote().sendText(JSON.toJSONString(message));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 此为单点消息(多人)
*
* @param userIds 用户编号列表
* @param message 消息
*/
public void sendMoreMessage(String[] userIds, String message) {
for (String userId : userIds) {
Session session = SESSION_POOL.get(userId);
if (session != null && session.isOpen()) {
try {
log.info("【WebSocket消息】单点消息:" + message);
session.getAsyncRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
(1)先注入websocket服务类
@Autowired
MyWebSocketHandler myWebSocketHandler;
(2)在方法中调用给前端发消息的方法
myWebSocketHandler.sendOneMessage(userId,messageInfor);
1.如果你在controller层调用了service层中身为异步的方法出现了HttpServeletrequst空指针你需要在controller层调用异步方法前加入下面的代码。
ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
RequestContextHolder.getRequestAttributes().setAttribute("request", request, RequestAttributes.SCOPE_REQUEST);
RequestContextHolder.setRequestAttributes(servletRequestAttributes,true);//设置子线程共享
调用requst中的参数时必须使用下面的方法
HttpServletRequest request2 = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
if( request2.getHeader(UserContext.USER_NAME)!=null){
return Optional.of(request2.getHeader(UserContext.USER_NAME));
}