<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.7.4</version>
<!-- <exclusions>-->
<!-- <exclusion>-->
<!-- <groupId>org.hibernate.validator</groupId>-->
<!-- <artifactId>hibernate-validator</artifactId>-->
<!-- </exclusion>-->
<!-- </exclusions>-->
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
</dependency>
websocket 是一种在单个TCP连接上进行全双工通信的协议
HTTP请求可能包含较长的头部，其中真正有效的数据可能只是很小的一部分，显然这样会浪费很多的带宽等资源
https://www.cnblogs.com/xuwenjin/p/12664650.html
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
@Slf4j
@Component
@ServerEndpoint(value="/websocketTest/{userId}")
public class WebsocketTest {
private static String userId;
//连接时执行
@OnOpen
public void onOpen(@PathParam("userId") String userId, Session session) throws IOException {
this.userId = userId;
log.info("新连接：{}",userId);
}
//关闭时执行
@OnClose
public void onClose(){
log.info("连接：{} 关闭",this.userId);
}
//收到消息时执行
@OnMessage
public void onMessage(String message, Session session) throws IOException {
log.info("收到用户{}的消息{}",this.userId,message);
session.getBasicRemote().sendText("收到"+this.userId+"的消息:"+message); //回复用户
log.info("wait before");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
log.info("wait ater");
session.getBasicRemote().sendText("收到"+this.userId+"的消息2:"+message); //回复用户
}
//连接错误时执行
@OnError
public void onError(Session session, Throwable error){
log.info("用户id为：{}的连接发送错误",this.userId);
error.printStackTrace();
}
}
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
websocket Demo---- user000 <br />
<input id="text" type="text" />
<button onclick="send()"> Send </button>
<button onclick="closeWebSocket()"> Close </button>
<div id="message"> </div>
<script type="text/javascript">
//判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
websocket = new WebSocket("ws://localhost:9990/websocketTest/userIdValue001");
console.log("link success")
}else{
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function(){
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event){
setMessageInnerHTML("open");
}
console.log("-----")
//接收到消息的回调方法
websocket.onmessage = function(event){
setMessageInnerHTML(event.data);
}
//连接关闭的回调方法
websocket.onclose = function(){
setMessageInnerHTML("close");
}
//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function(){
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML){
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket(){
websocket.close();
}
//发送消息
function send(){
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</body>
</html>
