Spring Boot 集成 WebSocket,轻松实现信息推送!
共 15569字,需浏览 32分钟
·
2021-04-23 17:12
阅读本文大概需要 6 分钟。
来自:blog.csdn.net/MacWx/article/details/111319558
一、什么是websocket?
二、使用步骤
1.添加依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
2.启用Springboot对WebSocket的支持
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
/**
* @ Auther: 马超伟
* @ Date: 2020/06/16/14:35
* @ Description: 开启WebSocket支持
*/
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3.核心配置:WebSocketServer
package cc.mrbird.febs.external.webScoket;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Created with IntelliJ IDEA.
* @ Auther: 马超伟
* @ Date: 2020/06/16/14:35
* @ Description:
* @ ServerEndpoint 注解是一个类层次的注解,它的功能主要是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
*/
@Component
@Slf4j
@Service
@ServerEndpoint("/api/websocket/{sid}")
public class WebSocketServer {
//当前在线连接数
private static int onlineCount = 0;
//存放每个客户端对应的MyWebSocket对象
private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
private Session session;
//接收sid
private String sid = "";
/**
* 连接建立成功调用的方法
*/
@OnOpen
public void onOpen(Session session, @PathParam("sid") String sid) {
this.session = session;
webSocketSet.add(this); //加入set中
this.sid = sid;
addOnlineCount(); //在线数加1
try {
sendMessage("conn_success");
log.info("有新窗口开始监听:" + sid + ",当前在线人数为:" + getOnlineCount());
} catch (IOException e) {
log.error("websocket IO Exception");
}
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
webSocketSet.remove(this); //从set中删除
subOnlineCount(); //在线数减1
log.info("释放的sid为:"+sid);
log.info("有一连接关闭!当前在线人数为" + getOnlineCount());
}
/**
* 收到客户端消息后调用的方法
* @ Param message 客户端发送过来的消息
*/
@OnMessage
public void onMessage(String message, Session session) {
log.info("收到来自窗口" + sid + "的信息:" + message);
//群发消息
for (WebSocketServer item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* @ Param session
* @ Param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.error("发生错误");
error.printStackTrace();
}
/**
* 实现服务器主动推送
*/
public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
}
/**
* 群发自定义消息
*/
public static void sendInfo(String message, @PathParam("sid") String sid) throws IOException {
log.info("推送消息到窗口" + sid + ",推送内容:" + message);
for (WebSocketServer item : webSocketSet) {
try {
//为null则全部推送
if (sid == null) {
// item.sendMessage(message);
} else if (item.sid.equals(sid)) {
item.sendMessage(message);
}
} catch (IOException e) {
continue;
}
}
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
WebSocketServer.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSocketServer.onlineCount--;
}
public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
return webSocketSet;
}
}
4.测试Controller
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Created with IntelliJ IDEA.
*
* @ Auther: 马超伟
* @ Date: 2020/06/16/14:38
* @ Description:
*/
@Controller("web_Scoket_system")
@RequestMapping("/api/socket")
public class SystemController {
//页面请求
@GetMapping("/index/{userId}")
public ModelAndView socket(@PathVariable String userId) {
ModelAndView mav = new ModelAndView("/socket1");
mav.addObject("userId", userId);
return mav;
}
//推送数据接口
@ResponseBody
@RequestMapping("/socket/push/{cid}")
public Map pushToWeb(@PathVariable String cid, String message) {
Map<String,Object> result = new HashMap<>();
try {
WebSocketServer.sendInfo(message, cid);
result.put("code", cid);
result.put("msg", message);
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
}
5.测试页面index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Java 后端 WebSocket 的 Tomcat 实现</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<body>
<div id="main" style="width: 1200px;height:800px;"></div>
Welcome<br/><input id="text" type="text" />
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>
</body>
<script type="text/javascript">
var websocket = null;
//判断当前浏览器是否支持WebSocket
if('WebSocket' in window) {
websocket = new WebSocket("ws://192.168.100.196:8082/api/websocket/100");
} else {
alert('当前浏览器 Not support websocket')
}
//连接发生错误回调方法
websocket.onerror = function() {
setMessageInnerHTML("WebSocket连接发生错误");
};
//连接成功建立回调方法
websocket.onopen = function() {
setMessageInnerHTML("WebSocket连接成功");
}
var U01data, Uidata, Usdata
//接收消息回调方法
websocket.onmessage = function(event) {
console.log(event);
setMessageInnerHTML(event);
setechart()
}
//连接关闭回调方法
websocket.onclose = function() {
setMessageInnerHTML("WebSocket连接关闭");
}
//监听窗口关闭事件
window.onbeforeunload = function() {
closeWebSocket();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭WebSocket连接
function closeWebSocket() {
websocket.close();
}
//发送消息
function send() {
var message = document.getElementById('text').value;
websocket.send('{"msg":"' + message + '"}');
setMessageInnerHTML(message + " ");
}
</script>
</html>
6.结果展示
总结
推荐阅读:
内容包含Java基础、JavaWeb、MySQL性能优化、JVM、锁、百万并发、消息队列、高性能缓存、反射、Spring全家桶原理、微服务、Zookeeper、数据结构、限流熔断降级......等技术栈!
⬇戳阅读原文领取! 朕已阅