使用webSocket长连接实现弹幕
maven坐标
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>2.5.1</version>
</dependency>
创建一个实体
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter(){
return new ServerEndpointExporter();
}
}
创建一个连接 WebSocketService
package com.bibibi.websocket;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
/**
* @author victor_Yao
* @createDate 2022/12/31 16:26
*/
@Component
//前端要连接到这个service地址
@ServerEndpoint("/imserService/{token}")
public class WebSocketService {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
/**
* 线程安全
*/
private static final AtomicInteger ONULINE_COUNT = new AtomicInteger(0);
/**
* concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
*/
private static final ConcurrentHashMap<String, WebSocketService> WEBSOCKET_MAP = new ConcurrentHashMap<>();
private Session session;
private String sessionId;
private String userId;
/**
* 因为是多例 没办法直接植入Bean
*/
private static ApplicationContext APPLICATION_CONTEXT;
//在启动类上 在创建把app带入
public static void setApplicationContext(ApplicationContext applicationContext) {
WebSocketService.APPLICATION_CONTEXT = applicationContext;
}
@OnOpen
public void openConnection(Session session, @PathParam("token") String token) {
/* this.userId= TokenUtil.ver*/
/* RedisTemplate<String, Object> redisTemplate = (RedisTemplate<String, Object>) WebSocketService.APPLICATION_CONTEXT.getBean("redisTemplate");
redisTemplate.opsForValue().get("sss");*/
this.sessionId = session.getId();
this.session = session;
if (WEBSOCKET_MAP.containsKey(sessionId)) {
WEBSOCKET_MAP.remove(sessionId);
WEBSOCKET_MAP.put(sessionId, this);
} else {
WEBSOCKET_MAP.put(sessionId, this);
//在线人数加一
ONULINE_COUNT.getAndIncrement();
}
logger.info("用户连接成功:" + sessionId + "当前在线人数:" + ONULINE_COUNT.get());
try {
this.sendMessage("0");
} catch (Exception e) {
logger.error("连接异常");
}
}
private void sendMessage(String message) throws IOException {
//发送信息
this.session.getBasicRemote().sendText(message);
}
/**
* 关闭
*/
@OnClose
public void closeConnection() {
if (WEBSOCKET_MAP.containsKey(sessionId)) {
WEBSOCKET_MAP.remove(sessionId);
//在线人数减一
ONULINE_COUNT.getAndDecrement();
}
logger.info("用户退出:" + sessionId + "当前在线人数:" + ONULINE_COUNT.get());
}
/**
* 拿到信息
*
* @param message
*/
@OnMessage
public void onMessage(String message) {
logger.info("用户信息:" + sessionId + ":::" + "报文:" + message);
if (Objects.nonNull(message)) {
try {
//群发消息
for (Map.Entry<String, WebSocketService> entry : WEBSOCKET_MAP.entrySet()) {
WebSocketService webSocketService = entry.getValue();
//TODO 加入MQ队列
if (webSocketService.session.isOpen()) {
webSocketService.sendMessage(message);
}
}
//TODO 发送弹幕到数据库中 或REDIS
} catch (Exception e) {
logger.error("弹幕接收异常");
e.printStackTrace();
}
}
}
/**
* 异常
*
* @param error
*/
@OnError
public void onError(Throwable error) {
}
public Session getSession() {
return session;
}
public String getSessionId() {
return sessionId;
}
}
在启动类中添加一个全局变量
@SpringBootApplication
@ComponentScan(basePackages = "com.bibibi.*")
@ServletComponentScan
//开启定时器
@EnableScheduling
//开启异步
@EnableAsync
public class BibibiApplication {
public static void main(String[] args) {
ApplicationContext app = SpringApplication.run(BibibiApplication.class, args);
//全局的变量
WebSocketService.setApplicationContext(app);
}
}
前端测试页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebSocket</title>
</head>
<body>
<h3>hello socket</h3>
<p>【userId】：<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【toUserId】：<div><input id="toUserId" name="toUserId" type="text" value="20"></div>
<p>【toUserId】：<div><input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>操作:<div><a onclick="openSocket()">开启socket</a></div>
<p>【操作】：<div><a onclick="sendMessage()">发送消息</a></div>
</body>
var socket;
function openSocket() {
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else{
console.log("您的浏览器支持WebSocket");
//实现化WebSocket对象，指定要连接的服务器地址与端口 建立连接
var userId = document.getElementById('userId').value;
//添加webSocket地址 dfsfdsf /token模拟
var socketUrl="ws://127.0.0.1:8081/imserService/dfsfdsf";
console.log(socketUrl);
if(socket!=null){
socket.close();
socket=null;
}
socket = new WebSocket(socketUrl);
//打开事件
socket.onopen = function() {
console.log("websocket已打开");
//socket.send("这是来自客户端的消息" + location.href + new Date());
};
//获得消息事件
socket.onmessage = function(msg) {
var serverMsg = "收到服务端信息：" + msg.data;
console.log(serverMsg);
//发现消息进入 开始处理前端触发逻辑
};
//关闭事件
socket.onclose = function() {
console.log("websocket已关闭");
};
//发生了错误事件
socket.onerror = function() {
console.log("websocket发生了错误");
}
}
}
function sendMessage() {
if(typeof(WebSocket) == "undefined") {
console.log("您的浏览器不支持WebSocket");
}else {
// console.log("您的浏览器支持WebSocket");
var toUserId = document.getElementById('toUserId').value;
var contentText = document.getElementById('contentText').value;
var msg = '{"toUserId":"'+toUserId+'","contentText":"'+contentText+'"}';
console.log(msg);
socket.send(msg);
}
}
</html>
注意：本文归作者所有，未经作者允许，不得转载
