1.前端代码
1.1 新建模块：spring-boot-websocker
1.2 添加pom依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId></dependency>
1.3 建包：config、controller
WebSocketConfig
/**
-
WebSocket的配置类
-
开启了WebSocket支持
*/
@Configuration
public class WebSocketConfig {@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
WebSocketServer
//客户端向服务器端建立WebSocket连接的url
@ServerEndpoint("/websocket")
@Component
public class WebSocketServer {
//静态变量，用来记录当前在线连接数,可选
private static int onlineCount = 0;
//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象，必须
private static CopyOnWriteArraySet<WebSocketServer> webSocketSet
= new CopyOnWriteArraySet<WebSocketServer>();
//与某个客户端的连接会话，需要通过它来给客户端发送数据,必须
private Session session;
/**
* 连接建立成功调用的方法
*/
@OnOpen
public void onOpen(Session session) {
this.session = session;
webSocketSet.add(this); //将客户端加入set中
addOnlineCount(); //在线数加1
System.out.println("有新窗口开始监听,当前在线人数为"
+ getOnlineCount());
try {
sendMessage("连接成功");
} catch (IOException e) {
System.out.println("WebSocket IO异常");
}
}
/**
* 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
System.out.println("有连接关闭！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) {
System.out.println("收到客户端的信息:" + 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) {
System.out.println("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) throws IOException {
System.out.println("推送消息内容:" + message);
for (WebSocketServer item : webSocketSet) {
try {
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--;
}
}
WebSocketController
@RestController
public class WebSocketController {
//推送数据接口
@GetMapping("/socket/push")
public String pushMsg(String message) {
try {
WebSocketServer.sendInfo(message);
} catch (IOException e) {
e.printStackTrace();
}
return "success";
}
}
2.后端代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>websocket示例</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<style type="text/css">
.alert_demo{
width: 150px;
height: 150px;
border:1px solid red;
position: absolute;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div id="app">
<h3>消息显示</h3>
<ul>
<li v-for="(message, index) in messages" :key="index">
{{message}}
</li>
</ul>
<hr>
<h3>发送消息 </h3>
<input type="text" v-model="sendMsg" />
<button type="button" @click="send">发送</button>
<el-alert v-if="isShow" :title="messages" type="success" description="接收到websocket数据,弹出此弹框" show-icon></el-alert>
<div class="alert_demo">
{{messages}}
</div>
</div>
<script type="text/javascript">
var socket;
var app = new Vue({
el: '#app',
data: {
messages: [],
sendMsg: '',
isShow:false
},
created: function() {
// var _this = this;
//创建WebSocket对象，指定要连接的服务器地址和端口，建立连接
socket = new WebSocket("ws://172.20.10.6:8080/websocket");
//打开连接
socket.onopen = function() {
console.log("Socket已打开");
};
//获得服务端推送的消息
socket.onmessage = (msg)=> {
console.log(msg.data);
this.messages.push(msg.data);
console.log(this.messages);
this.isShow = true
setTimeout(()=>{
this.isShow = false
},3000)
this.$message({
type:'success',
message:msg.data
})
};
//关闭连接
socket.onclose = function() {
console.log("Socket已关闭");
};
//发送错误
socket.onerror = function() {
alert("Socket发生了错误");
}
},
watch: {
// 如果 `messages` 发生改变，这个函数就会运行
messages: function(newMsg, oldMsg) {
this.messages = newMsg;
},
},
methods: {
send: function() {
socket.send(this.sendMsg);
}
}
})
</script>
</body>
</html>
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