Java Springboot websocket使用案例详解-编程学习网

什么是WebSocket

WebSocket是一种在单个TCP连接上进行全双工通信的协议 …

为什么要实现握手监控管理

如果说，连接随意创建，不管的话，会存在错误，broken pipe

表面看单纯报错，并没什么功能缺陷等，但实际，请求数增加，容易导致系统奔溃。这边画重点。

出现原因有很多种，目前我这边出现的原因，是因为客户端已关闭连接，服务端还持续推送导致。

如何使用

下面将使用springboot集成的webSocket

导入Maven

首先SpringBoot版本


<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.RELEASE</version>
</parent>

集成websocket


// 加个web集成吧
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

Java代码

Config配置

首先，我们需要重写WebSocketHandlerDecoratorFactory

主要用来监控客户端握手连接进来以及挥手关闭连接

代码

需要一个管理Socket的类


package com.li.manager;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.socket.WebSocketSession;

import java.util.concurrent.ConcurrentHashMap;


@Slf4j
public class SocketManager {
    private static ConcurrentHashMap<String, WebSocketSession> manager = new ConcurrentHashMap<String, WebSocketSession>();

    public static void add(String key, WebSocketSession webSocketSession) {
        log.info("新添加webSocket连接 {} ", key);
        manager.put(key, webSocketSession);
    }

    public static void remove(String key) {
        log.info("移除webSocket连接 {} ", key);
        manager.remove(key);
    }

    public static WebSocketSession get(String key) {
        log.info("获取webSocket连接 {}", key);
        return manager.get(key);
    }


}


package com.li.factory;

import com.li.manager.SocketManager;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.WebSocketHandlerDecorator;
import org.springframework.web.socket.handler.WebSocketHandlerDecoratorFactory;

import java.security.Principal;


@Component
@Slf4j
public class WebSocketDecoratorFactory implements WebSocketHandlerDecoratorFactory {
    @Override
    public WebSocketHandler decorate(WebSocketHandler handler) {
        return new WebSocketHandlerDecorator(handler) {
            @Override
            public void afterConnectionEstablished(WebSocketSession session) throws Exception {
                log.info("有人连接啦  sessionId = {}", session.getId());
                Principal principal = session.getPrincipal();
                if (principal != null) {
                    log.info("key = {} 存入", principal.getName());
                    // 身份校验成功，缓存socket连接
                    SocketManager.add(principal.getName(), session);
                }


                super.afterConnectionEstablished(session);
            }

            @Override
            public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
                log.info("有人退出连接啦  sessionId = {}", session.getId());
                Principal principal = session.getPrincipal();
                if (principal != null) {
                    // 身份校验成功，移除socket连接
                    SocketManager.remove(principal.getName());
                }
                super.afterConnectionClosed(session, closeStatus);
            }
        };
    }
}

注意：以上session变量，需要注意两点，一个是getId(),一个是getPrincipal().getName()

getId() ：返回的是唯一的会话标识符。

getPrincipal() : 经过身份验证，返回Principal实例，未经过身份验证，返回null

Principal: 委托人的抽象概念,可以是公司id，名字，用户唯一识别token等

当你按上面代码使用，你会发现getPrincipal()返回null，为什么？这边还需要重写一个DefaultHandshakeHandler

代码


package com.li.handler;

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.support.DefaultHandshakeHandler;

import javax.servlet.http.HttpServletRequest;
import java.security.Principal;
import java.util.Map;


@Slf4j
@Component
public class PrincipalHandshakeHandler extends DefaultHandshakeHandler {
    @Override
    protected Principal determineUser(ServerHttpRequest request, WebSocketHandler wsHandler, Map<String, Object> attributes) {
        
        if (request instanceof ServletServerHttpRequest) {
            ServletServerHttpRequest servletServerHttpRequest = (ServletServerHttpRequest) request;
            HttpServletRequest httpRequest = servletServerHttpRequest.getServletRequest();
            
            final String token = httpRequest.getParameter("token");
            if (StringUtils.isEmpty(token)) {
                return null;
            }
            return new Principal() {
                @Override
                public String getName() {
                    return token;
                }
            };
        }
        return null;
    }
}

需要的东西都有了，那准备装载吧

代码


package com.li.config;

import com.li.factory.WebSocketDecoratorFactory;
import com.li.handler.PrincipalHandshakeHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketTransportRegistration;



@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Autowired
    private WebSocketDecoratorFactory webSocketDecoratorFactory;
    @Autowired
    private PrincipalHandshakeHandler principalHandshakeHandler;

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        
        registry.addEndpoint("/myUrl")
                .setAllowedOrigins("*")
                .setHandshakeHandler(principalHandshakeHandler)
                .withSockJS();
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        
        registry.enableSimpleBroker("/queue", "/topic");
        registry.setUserDestinationPrefix("/user");
    }

    @Override
    public void configureWebSocketTransport(WebSocketTransportRegistration registration) {
        registration.addDecoratorFactory(webSocketDecoratorFactory);
        super.configureWebSocketTransport(registration);
    }
}

终于完成了

最后，来一个通过http请求，将其发送到客户端

代码


package com.li.controller;

import com.li.manager.SocketManager;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.messaging.simp.SimpMessagingTemplate;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.socket.WebSocketSession;

import java.util.Map;

@RestController
@Slf4j
public class TestController {

    @Autowired
    private SimpMessagingTemplate template;

    
    @RequestMapping("/sendUser")
    public void sendUser(String token) {
        log.info("token = {} ,对其发送您好", token);
        WebSocketSession webSocketSession = SocketManager.get(token);
        if (webSocketSession != null) {
            
            template.convertAndSendToUser(token, "/queue/sendUser", "您好");
        }

    }

    
    @RequestMapping("/sendTopic")
    public void sendTopic() {
        template.convertAndSend("/topic/sendTopic", "大家晚上好");

    }

    
    // 相当于RequestMapping
    @MessageMapping("/sendServer")
    public void sendServer(String message) {
        log.info("message:{}", message);
    }

    
    @MessageMapping("/sendAllUser")
    @SendTo("/topic/sendTopic")
    public String sendAllUser(String message) {
        // 也可以采用template方式
        return message;
    }

    
    @MessageMapping("/sendMyUser")
    public void sendMyUser(@RequestBody Map<String, String> map) {
        log.info("map = {}", map);
        WebSocketSession webSocketSession = SocketManager.get(map.get("name"));
        if (webSocketSession != null) {
            log.info("sessionId = {}", webSocketSession.getId());
            template.convertAndSendToUser(map.get("name"), "/queue/sendUser", map.get("message"));
        }
    }


}

前端代码

可以直接启动


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Spring Boot WebSocket+广播式</title>
</head>
<body>
    <noscript>
        <h2 style="color:#ff0000">貌似你的浏览器不支持websocket</h2>
    </noscript>
    <div>
        <div>
            <button id="connect" onclick="connect()">连接</button>
            <button id="disconnect"  onclick="disconnect();">断开连接</button>
        </div>
        <div id="conversationDiv">
            <label>输入你的名字</label> <input type="text" id="name" />
            <br>
            <label>输入消息</label> <input type="text" id="messgae" />
            <button id="send" onclick="send();">发送</button>
            <p id="response"></p>
        </div>
    </div>
    <script src="https://cdn.bootcss.com/sockjs-client/1.1.4/sockjs.min.js"></script>
    <script src="https://cdn.bootcss.com/stomp.js/2.3.3/stomp.min.js"></script>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript">
        var stompClient = null;
        //gateway网关的地址
        var host="http://127.0.0.1:8888";
        function setConnected(connected) {
            document.getElementById('connect').disabled = connected;
            document.getElementById('disconnect').disabled = !connected;
            document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
            $('#response').html();
        }
        // SendUser ***********************************************
        function connect() {
            //地址+端点路径，构建websocket链接地址,注意，对应config配置里的addEndpoint
            var socket = new SockJS(host+'/myUrl' + '?token=4567');
            stompClient = Stomp.over(socket);
            stompClient.connect({}, function(frame) {
                setConnected(true);
                console.log('Connected:' + frame);
                //监听的路径以及回调
                stompClient.subscribe('/user/queue/sendUser', function(response) {
                    showResponse(response.body);
                });
            });
        }
        
        function disconnect() {
            if (stompClient != null) {
                stompClient.disconnect();
            }
            setConnected(false);
            console.log("Disconnected");
        }
        function send() {
            var name = $('#name').val();
            var message = $('#messgae').val();
            
            
            
            stompClient.send("/sendMyUser", {}, JSON.stringify({name:name,message:message}));
        }
        function showResponse(message) {
            var response = $('#response');
            response.html(message);
        }
    </script>
</body>
</html>

到此这篇关于Java Springboot websocket使用案例详解的文章就介绍到这了,更多相关Java Springboot websocket使用内容请搜索编程网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编程网！

文章详情

Java Springboot websocket使用案例详解

什么是WebSocket

为什么要实现握手监控管理

如何使用

Java代码

Config配置

首先，我们需要重写WebSocketHandlerDecoratorFactory

代码

注意：以上session变量，需要注意两点，一个是getId(),一个是getPrincipal().getName()

当你按上面代码使用，你会发现getPrincipal()返回null，为什么？这边还需要重写一个DefaultHandshakeHandler

代码

需要的东西都有了，那准备装载吧

代码

终于完成了

最后，来一个通过http请求，将其发送到客户端

代码

前端代码

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