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java注解实现websocket服务的两种方式

作者:humannoid

Java WebSocket是一种基于TCP协议的双向全双工消息传输技术,它允许服务器和客户端之间实时通信,具有低延迟和高效率的特点,下面这篇文章主要给大家介绍了关于java注解实现websocket服务的两种方式,需要的朋友可以参考下

1.基于java注解实现websocket服务器端

1.1需要的类

1.1.1服务终端类

用java注解来监听连接@ServerEndpoint、连接成功@OnOpen、连接失败@OnClose、收到消息等状态@OnMessage

1.1.2配置类

把spring中的ServerEndpointExporter对象注入进来

2.1代码示例

2.1.1 maven配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.heima</groupId>
    <artifactId>ws-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
           <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-websocket -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <version>2.7.14</version>
        </dependency>



    </dependencies>

</project>

2.1.2 WsServerEndpoint类

package com.heima;

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/***
 * 监听websocket地址  /myWs
 */
@ServerEndpoint("/myWs")
@Component
@Slf4j
@EnableScheduling
public class WsServerEndpoint {

    static Map<String,Session> map = new ConcurrentHashMap<String,Session>();

    /***
     * 连接建立时执行的操作
     * @param session
     */
    @OnOpen
    public void onOpen(Session session)
    {
        map.put(session.getId(),session);
        log.info("websocket is open");
    }

    /***
     * 收到客户端消息执行的操作
     * @param text
     */
    @OnMessage
    public String OnMessage(String text)
    {
        log.info("收到了一条信息"+text);
        return "已收到你的信息" ;
    }

    /***
     * 连接关闭时执行的操作
     * @param session
     */
    @OnClose
    public void OnClose(Session session)
    {
        map.remove(session.getId());
        log.info("连接关闭时执行的操作");
    }

    /***
     * 向客户端发送信息
     */
    @Scheduled(fixedRate = 2000)
    public void sendMsg() throws IOException {
        for (String key : map.keySet())
        {
            map.get(key).getBasicRemote().sendText("你好,你好");
        }
    }
}

2.1.3 WebSocketConfig

package com.heima;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WebSocketConfig {


    @Bean
 public ServerEndpointExporter serverEndpointExporter()
 {
     return new ServerEndpointExporter();
 }



}

2.1.3 前端测试代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>wsClient</title>
</head>
<body>

<script>
     // 创建websocket
    let ws = new WebSocket("ws://localhost:8080/myWs")
     //向服务器发送hello
    ws.onopen=function (){
        ws.send("hello")
    }
    //监听数据ws://localhost:8080/myWs
    ws.onmessage=function (message){
        console.log(message.data)
    }
</script>
</body>
</html>

2.1.4测试结果

2.1.4.1 当打开浏览器时

2.1.4.2 当关闭浏览器时

2.1.4.3 当刷新浏览器的时候

2.基于spring提供的类和接口刷新websocket服务器端

2.1:HttpSessionHandShakeInter 握手拦截器

package com.spring;

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor;

import java.util.Map;

/***
 * 握手拦截器
 */
@Component
@Slf4j
public class MyWsInterceptor extends HttpSessionHandshakeInterceptor {


    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        log.info(request.getRemoteAddress().toString()+"开始握手");
        return super.beforeHandshake(request, response, wsHandler, attributes);
    }

    @Override
    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) {
         log.info(request.getRemoteAddress().toString()+"完成握手");
        super.afterHandshake(request, response, wsHandler, ex);
    }
}

2.2  MyWsHandler 主处理程序

sessionbean封装类

import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.web.socket.WebSocketSession;

@Data
@AllArgsConstructor
public class SessionBean {
    private WebSocketSession webSocketSession;
    private Integer clientId;
}

 主处理程序

package com.spring;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.server.Session;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.AbstractWebSocketHandler;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

/***
 * webSocket 主处理程序
 */
@Component
@Slf4j
@EnableScheduling
public class MyWsHandler extends AbstractWebSocketHandler {
    //map有并发线程问题  所以用ConcurrentHashMap
    private static Map<String, SessionBean> map ;
    //id有并发问题 所以用Integer的安全类型
    private static AtomicInteger clientIdMaker;
    static {

        map = new ConcurrentHashMap<>();
        clientIdMaker=new AtomicInteger(0);
    }
    //连接建立
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        super.afterConnectionEstablished(session);
        //将session 进一步封装  id采用的是自增
        SessionBean sessionBean = new SessionBean(session, clientIdMaker.getAndIncrement());
        map.put(session.getId(),sessionBean);
        log.info(map.get(session.getId()).getClientId()+"建立了连接");
    }

    //收到消息
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        super.handleTextMessage(session, message);
        log.info(map.get(session.getId()).getClientId()+":"+message.getPayload());
    }

    //传输异常
    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
        super.handleTransportError(session, exception);

        if (session.isOpen())
        {
            session.close();
        }
        map.remove(session.getId());

    }
    //连接关闭
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        super.afterConnectionClosed(session, status);
        log.info(map.get(session.getId()).getClientId()+"关闭连接");
    }

    /***
     * 向客户端发送信息
     */
    @Scheduled(fixedRate = 2000)
    public void sendMsg() throws IOException {
        for (String key : map.keySet())
        {
            map.get(key).getWebSocketSession().sendMessage(new TextMessage("hello," +
                    "spring socket"));
        }
    }
}

2.3 WebSocketConfigurer 注册拦截器和主处理程序以及监听路径

package com.spring;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;

import javax.annotation.Resource;

@Configuration
@EnableWebSocket
public class MyWsConfig implements WebSocketConfigurer {
    @Resource
    private MyWsHandler wsHandler;
    @Resource
    private MyWsInterceptor wsInterceptor;
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(wsHandler,"/myWs1").addInterceptors(wsInterceptor).setAllowedOriginPatterns("*");
    }
}

2.4 前端测试

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>wsClient</title>
</head>
<body>

<script>
     // 创建websocket
    let ws = new WebSocket("ws://localhost:8080/myWs1")
     //向服务器发送hello
    ws.onopen=function (){
        ws.send("hello")
    }
    //监听数据ws://localhost:8080/myWs
    ws.onmessage=function (message){
        console.log(message.data)
    }
</script>
</body>
</html>

总结 

到此这篇关于java注解实现websocket服务两种方式的文章就介绍到这了,更多相关java websocket服务实现内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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