websocket基础

下面就以代码来进行说明

1，先导入websocket依赖

        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId></dependency>

2.编写websocket相关bean管理配置

@Configuration
public class config {//申明websocket是由bean管理的@Beanpublic ServerEndpointExporter serverEndpointExporter() {return new ServerEndpointExporter();}
}

3.编写业务层代码

@ServerEndpoint("/api/{user_id}")
@Component
public class servlet {private  String id;//客户端建立@OnOpenpublic  void  onopen(Session  session,  @PathParam("user_id")String id){this.id=id;try {session.getBasicRemote().sendText("连接建立成功");} catch (IOException e) {throw new RuntimeException(e);}System.out.println("连接建立");}//客户端发送消息，服务端接受@OnMessagepublic  void  onoMessage(String  message,  Session session){System.out.println(message);try {//向客户端返还信息session.getBasicRemote().sendText("消息收到");} catch (IOException e) {throw new RuntimeException(e);}}//客户端关闭时候@OnClosepublic  void  onoClose(Session  session,  @PathParam("user_id")String id){this.id=id;System.out.println("连接关闭");}
}

注意@ServerEndpoint("/api/{user_id}")此注解供websocket提供访问连接url

4.附赠前端代码一份

<!doctype html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport"content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title>
</head><body>
<input id="input"  type="text" placeholder="输入你的内容">
<button id="but">发送请求</button>
<div id="div1" style="width: 200px;height: 200px; background:yellow;"></div>
<script>let input = document.getElementById("input");let but = document.getElementById("but");let div1 = document.getElementById("div1");//参数1：websocket服务地址var socket=new WebSocket("ws://localhost:8080/api/1");//open:当websocket服务连接成功socket.addEventListener("open",function (){div1.innerHTML="连接服务成功了"//客户端发送消息socket.send("发送成功")})//message:接受客户端的信息socket.addEventListener("message",function (re){console.log(re.data)})//客户端关闭时socket.addEventListener("close",function (){div1.innerHTML="我已经离开了"})
</script>
</body>
</html>

5.代码一些关键解析