1.概念
建立网络通信连接至少要一对端口号(socket)。socket本质是编程接口(API)，对TCP/IP的封装，TCP/IP也要提供可供程序员做网络开发所用的接口，这就是Socket编程接口；HTTP是轿车，提供了封装或者显示数据的具体形式；Socket是发动机，提供了网络通信的能力。
2.在pom中加个依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
3.WebSocketConfig
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
4.WebSocketServer
@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";
}
}
5.
<!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>
<style>
/* .message-box {
position: fixed;
height: 100px;
width: 300px;
right: 10px;
bottom: 10px;
border: #AAAAAA 1px solid;
box-shadow: #A9A9A9 0 0 6px 0;
}
.close {
margin-right: 1px;
margin-top: 5px;
} */
@keyframes myfirst{
from{
bottom:-25rem;
}
to{
bottom: 0;
}
}
.container{
animation: myfirst 8s;
background-color: /* rgb(128,209,255) */ red;
position: fixed;
right: 0;
bottom: 0;
width: 12.5rem;
height: 12.5rem;
border-top-right-radius: 0.9375rem;
border-top-left-radius: 0.9375rem;
border: 0.1875rem solid /* rgb(128,209,255) */ red;
}
.content{
background-color: #FFFFFF;
width: 100%;
height: 11.25rem;
display: flex;
flex-direction: column;
/* align-items: center; */
}
.item{
width: 90%;
height: 2.5rem;
display: flex;
justify-content: center;
align-items: center;
border-bottom: 1px dashed #EEEEEE;
}
.title{
display: flex;
justify-content: space-between;
}
.title-left{
margin-left: 0.625rem;
}
.title-right{
display: flex;
margin-right: 0.625rem;
}
.icon-minus{
margin-right: 0.625rem;
}
.icon-remove:hover{
cursor: pointer;
color: red;
}
.icon-minus:hover{
cursor: pointer;
color: red;
}
a:hover{
color:red ;
cursor: pointer;
text-decoration: underline;
}
</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>
<!-- <div v-show="show" class="message-box">
<li v-for="(message, index) in messages" :key="index">
{{message}}
</li>
<div class="close">
<button class="close-btn" type="button" @click="close">关闭</button>
</div></div> -->
<div class="container" v-show="close">
<div class="title">
<div class="title-left">消息</div>
<div class="title-right">
<i class="icon-minus"></i>
<i class="icon-remove" @click="closepage"></i>
<button @click="closepage">×</button>
</div>
</div>
<div class="content">
{{msg}}
</div>
</div>
</div>
<script type="text/javascript">
var socket;
var app = new Vue({
el: '#app',
data: {
messages: [],
sendMsg: '',
close:true,
show: false,
msg:''
},
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://localhost: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 = function(msg) {
console.log(msg.data);
_this.messages.push(msg.data);
console.log(_this.messages);
};
//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.msg = this.messages[this.messages.length-1];
this.messages = newMsg;
this.show = true;
},
},
methods: {
close: function() {
this.show = false;
},
send: function() {
socket.send(this.sendMsg);
},
closepage: function() {
this.close = false;
}
}
})
</script>
</body>
</html>
