Springboot 整合Websocket+Stomp协议+RabbitMQ做消息代理实例教程

比眉伴天荒 2022-12-01 15:57 267阅读 0赞

# **前言** #

**如果你还没有了解过websocket，关于整合websocket的简单入门使用，可以先看看我这篇：**

**《**SpringBoot 整合WebSocket 简单实战案例**》**

[https://blog.csdn.net/qq\_35387940/article/details/93483678][https_blog.csdn.net_qq_35387940_article_details_93483678]

ok，若你是通过关键字搜索到该篇的，那么我清楚你想了解 什么，这也是我写该篇文章的目的。

我想让所有人对springboot整合 webSocket 再也不陌生，再也不怕去整合，包括使用rabbitmq等等，使用SendTo，SendToUser等等，你所迷惑的，在这篇文章，我都能给你解惑。

这是一篇结合实例以及代码简析的一篇教程文章，我个人非常啰嗦，所以没有耐心的读者可以跳跃性阅读。

# **正文** #

**那么该篇内容包括什么？**

**1.使用stomp协议**

**2.使用rabbitmq作为消息代理**

**3.使用rabbitmq接收发送消息**

**4.推送消息的确认，消费消息的确认**

**5.简单的页面配合收发消息测试**

**6. 通过连接websocekt时传递个人信息参数，后台接收（拦截获取参数）**

**7.一对一发收，一对多发收**

实例项目结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70][]

大致涉及内容的作用简略图，具体跟着案例代码了解：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 1][]

开始进入到我们的实例教程，

### **首先pom文件引入使用到的依赖：** ###

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-websocket</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.58</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-amqp</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-reactor-netty</artifactId>
            </dependency>

*ps：springboot该篇用的2.0.0.RELEASE，java1.8*

### **然后创建WebSocketConfig.java ：** ###

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.messaging.simp.config.ChannelRegistration;
    import org.springframework.messaging.simp.config.MessageBrokerRegistry;
    import org.springframework.web.socket.config.annotation.*;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    
    @Configuration
    @EnableWebSocketMessageBroker
    public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Autowired
    GetHeaderParamInterceptor getHeaderParamInterceptor;
        @Override
        public void registerStompEndpoints(StompEndpointRegistry registry) {
            registry.addEndpoint("/ws").setAllowedOrigins("*")
                    .withSockJS();
            //暴露多个节点,就一样直接addEndpoint 就可以
    //        registry.addEndpoint("/alone") .setAllowedOrigins("*")
    //               .withSockJS();
        }
    
        @Override
        public void configureMessageBroker(MessageBrokerRegistry registry) {
    
       //如果不使用rabbitmq作为消息代理,那么只需要暴露简单节点即可
       // 默认的Simple Broker
       //   registry.enableSimpleBroker("/topic","/user");
       //  registry.setApplicationDestinationPrefixes("/app");
    
    
            // 使用RabbitMQ做为消息代理，替换默认的Simple Broker
            //定义了服务端接收地址的前缀，也即客户端给服务端发消息的地址前缀,@SendTo(XXX) 也可以重定向
    
             registry.setUserDestinationPrefix("/user"); //这是给sendToUser使用,前端订阅需要加上/user
    
             registry.setApplicationDestinationPrefixes("/app"); //这是给客户端推送消息到服务器使用 ，推送的接口加上/app
            // "STOMP broker relay"处理所有消息将消息发送到外部的消息代理
            registry.enableStompBrokerRelay("/exchange","/topic","/queue","/amq/queue")
                    .setVirtualHost("JCChost") //对应自己rabbitmq里的虚拟host
                    .setRelayHost("localhost")
                    .setClientLogin("root")
                    .setClientPasscode("root")
                    .setSystemLogin("root")
                    .setSystemPasscode("root")
                    .setSystemHeartbeatSendInterval(5000)
                    .setSystemHeartbeatReceiveInterval(4000);
    
        }
        /**
         * 采用自定义拦截器，获取connect时候传递的参数
         *
         * @param registration
         */
        @Override
        public void configureClientInboundChannel(ChannelRegistration registration) {
            registration.interceptors(getHeaderParamInterceptor);
        }
    }

### **WebSocketConfig 代码简析及注意点 ：** ###

1.@EnableWebSocketMessageBroker

这个注解作用是为了 是程序能够识别出 连接了 暴露的stomp节点 发送过来的 请求。 配合 @MessageMapping 是用 。（后面有介绍）

2.registry.addEndpoint("/ws")

这就是暴露节点，就是可以让客户端连接到websocket的节点。 如果需要暴露多个，就一样使用registry.addEndpoint("/XXX")即可。

3.configureMessageBroker

配置消息代理，前言说到我们该篇会使用rabbitmq来作为消息代理，所以咱们配置的代码就是使用的rabbitmq。

如果不想整合rabbitmq的话，单纯开启简单的消息代理，两三行代码即可。

registry.enableSimpleBroker("/topic","/queue");
    registry.setApplicationDestinationPrefixes("/app");
    registry.setUserDestinationPrefix("/user");

registry.enableSimpleBroker("/topic","/queue") ：

意思是在暴露的节点上，消息代理即将会处理 前缀为 /topic 和 /queue 的请求消息。 （可以理解为，服务端给客户端推送消息使用）

registry.setApplicationDestinationPrefixes("/app") ：

意思是客户端程序访问服务器，需带有/app 前缀，那么这些带有/app的消息就会匹配到@MessageMapping注解的方法上。

（可以理解为客户端向服务端推送消息使用）  
registry.setUserDestinationPrefix("/user") ：

这个就比较好玩，就是服务端指定给用户一对一推送消息，使用 sendToUser 方法时，会帮我们默认拼接上 /user，所以客户端也需要订阅相关的/user前缀的主题才能正常接收。（后面代码还会介绍到）

而我们该篇是使用rabbitmq作为消息代理，所以咱们的代码是：  
这些代码就没啥还解释了，上面都说了核心的几个代码意义了，其余就是连接rabbbitmq的一些相关信息，账号密码，虚拟host等。

registry.setUserDestinationPrefix("/user"); //这是给sendToUser使用,前端订阅需要加上/user
             registry.setApplicationDestinationPrefixes("/app"); //这是给客户端推送消息到服务器使用 ，推送的接口加上/app
            // "STOMP broker relay"处理所有消息将消息发送到外部的消息代理
            registry.enableStompBrokerRelay("/exchange","/topic","/queue","/amq/queue")
                    .setVirtualHost("JCChost")
                    .setRelayHost("localhost")
                    .setClientLogin("root")
                    .setClientPasscode("root")
                    .setSystemLogin("root")
                    .setSystemPasscode("root")
                    .setSystemHeartbeatSendInterval(5000)
                    .setSystemHeartbeatReceiveInterval(4000);

再来看 configureClientInboundChannel ，

这个就比较关键，使用客户端绑定配置，咱们绑定了一个拦截器 getHeaderParamInterceptor ，从命名看就知道，就是为了拦截一些参数。

没错，为了识别客户端连接到咱们的websocket上，到底是谁？ 我们该篇采取的就是，让客户端连接时携带自己的个人唯一识别信息过来，在建立连接时，取出该参数，为其实现用户信息认证设置。

### **需要创建GetHeaderParamInterceptor.java：** ###

import org.springframework.messaging.Message;
    import org.springframework.messaging.MessageChannel;
    import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
    import org.springframework.messaging.simp.stomp.StompCommand;
    import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
    import org.springframework.messaging.support.ChannelInterceptorAdapter;
    import org.springframework.messaging.support.MessageHeaderAccessor;
    import org.springframework.stereotype.Component;
    import java.util.LinkedList;
    import java.util.Map;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    @Component
    public class GetHeaderParamInterceptor extends ChannelInterceptorAdapter {
    
        @Override
        public Message<?> preSend(Message<?> message, MessageChannel channel) {
            StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
            if (StompCommand.CONNECT.equals(accessor.getCommand())) {
                Object raw = message.getHeaders().get(SimpMessageHeaderAccessor.NATIVE_HEADERS);
                if (raw instanceof Map) {
                    Object name = ((Map) raw).get("username"); //取出客户端携带的参数
                    System.out.println(name);
                    if (name instanceof LinkedList) {
                        // 设置当前访问的认证用户
                        accessor.setUser(new UserPrincipal(((LinkedList) name).get(0).toString()));
                    }
                }
            }
            return message;
        }
    }

### **为了完成用户信息的设置，需要使用到Principal ，所以我们还需要创建 UserPrincipal.java：** ###

import java.security.Principal;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    public class UserPrincipal implements Principal {
    
        private final String name;
    
        public UserPrincipal(String name) {
            this.name = name;
        }
    
        @Override
        public String getName() {
            return name;
        }
    }

ok，也就是说关于websocket的配置，我们创建了上面的三个文件（继续敲代码前，先自己回顾一下这三个东西的作用）：  
![20200831093903807.png][]

接下来，我们需要为项目整合上 RabbitMQ。

### **创建MyRabbitConfig.java：** ###

提前说下，这个关于rabbitmq的所有东西，我暂且都配置在这里。

import cn.jc.springbootwebsocketdemo.service.ChatService;
    import org.springframework.amqp.core.*;
    import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
    import org.springframework.amqp.rabbit.connection.ConnectionFactory;
    import org.springframework.amqp.rabbit.core.ChannelAwareMessageListener;
    import org.springframework.amqp.rabbit.core.RabbitTemplate;
    import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
    import org.springframework.amqp.rabbit.support.CorrelationData;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2019/9/3
     * @Description :
     **/
    
    @Configuration
    public class MyRabbitConfig {
    
        @Autowired
        ChatService chatService;
    
    
        //绑定键
        public final static String msgTopicKey = "topic.public";
        //队列
        public final static String msgTopicQueue = "topicQueue";
    
        @Bean
        public Queue topicQueue() {
            return new Queue(MyRabbitConfig.msgTopicQueue,true);
        }
    
    
        @Bean
        TopicExchange exchange() {
            return new TopicExchange("topicWebSocketExchange",true,false);
        }
    
    
        //将firstQueue和topicExchange绑定,而且绑定的键值为topic.man
        //这样只要是消息携带的路由键是topic.man,才会分发到该队列
        @Bean
        Binding bindingExchangeMessage() {
            return BindingBuilder.bind(topicQueue()).to(exchange()).with(msgTopicKey);
        }
    
    
    
        @Bean
        public ConnectionFactory connectionFactory() {
            CachingConnectionFactory connectionFactory = new CachingConnectionFactory("127.0.0.1", 5672);
            connectionFactory.setUsername("root");
            connectionFactory.setPassword("root");
            connectionFactory.setVirtualHost("JCChost");
            connectionFactory.setPublisherConfirms(true); // 发送消息回调,必须要设置
            connectionFactory.setPublisherReturns(true);
            return connectionFactory;
        }
    
    
        @Bean
        public RabbitTemplate createRabbitTemplate(ConnectionFactory connectionFactory){
            RabbitTemplate rabbitTemplate = new RabbitTemplate();
            rabbitTemplate.setConnectionFactory(connectionFactory);
            //设置开启Mandatory,才能触发回调函数,无论消息推送结果怎么样都强制调用回调函数
            rabbitTemplate.setMandatory(true);
    
            rabbitTemplate.setConfirmCallback(new RabbitTemplate.ConfirmCallback() {
                @Override
                public void confirm(CorrelationData correlationData, boolean ack, String cause) {
                    System.out.println("ConfirmCallback:     "+"相关数据："+correlationData);
                    System.out.println("ConfirmCallback:     "+"确认情况："+ack);
                    System.out.println("ConfirmCallback:     "+"原因："+cause);
                }
            });
    
            rabbitTemplate.setReturnCallback(new RabbitTemplate.ReturnCallback() {
                @Override
                public void returnedMessage(org.springframework.amqp.core.Message message, int replyCode, String replyText, String exchange, String routingKey) {
                    System.out.println("ReturnCallback:     "+"消息："+message);
                    System.out.println("ReturnCallback:     "+"回应码："+replyCode);
                    System.out.println("ReturnCallback:     "+"回应信息："+replyText);
                    System.out.println("ReturnCallback:     "+"交换机："+exchange);
                    System.out.println("ReturnCallback:     "+"路由键："+routingKey);
                }
    
    
            });
    
            return rabbitTemplate;
        }
    
    
    
    
        /**
         * 接受消息的监听，这个监听会接受消息队列topicQueue的消息
         * 针对消费者配置
         * @return
         */
        @Bean
        public SimpleMessageListenerContainer messageContainer() {
            SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory());
            container.setQueues(topicQueue());
            container.setExposeListenerChannel(true);
            container.setMaxConcurrentConsumers(1);
            container.setConcurrentConsumers(1);
            container.setAcknowledgeMode(AcknowledgeMode.MANUAL); //设置确认模式手工确认
            container.setMessageListener(new ChannelAwareMessageListener() {
                public void onMessage(Message message, com.rabbitmq.client.Channel channel) throws Exception {
                    byte[] body = message.getBody();
                    String msg = new String(body);
                    System.out.println("rabbitmq收到消息 : " +msg);
                    Boolean sendToWebsocket = chatService.sendMsg(msg);
    
                    if (sendToWebsocket){
                        System.out.println("消息处理成功！ 已经推送到websocket！");
                        channel.basicAck(message.getMessageProperties().getDeliveryTag(), true); //确认消息成功消费
    
                    }
                }
    
            });
            return container;
        }
    
    }

### **看到这么多代码是不是一下子有点懵，没事，看我的MyRabbitConfig代码简析 ：** ###

1.连接rabbitmq代码

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 2][]

2.简单使用一下主题交换机

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 3][]

（其实可以配置更多的交换机，对于使用rabbitmq方面，完全没接触过的小伙伴，不妨先看看这篇文章，《Springboot 整合RabbitMq ，用心看完这一篇就够了》 链接： [https://blog.csdn.net/qq\_35387940/article/details/100514134][https_blog.csdn.net_qq_35387940_article_details_100514134]）

3.配置生产者推送消息触发的回调函数

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 4][]

4.消费者监听器，采取开启手动确认

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 5][]

ok，到这里我们可以看到整合上rabbitmq的相关内容，完毕。

![20200831095827920.png][]

那么还有接收消息使用到的实体类，处理消息的业务类，也就是

ChatMessage.java：

*这里实体类比较简单，大家可以自己扩展符合自己消息内容场景的。*

/**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    public class ChatMessage {
        private MessageType type;
        private String content;
        private String sender;
        private String to;
    
        public enum MessageType {
            CHAT,
            JOIN,
            LEAVE
        }
    
        @Override
        public String toString() {
            return "ChatMessage{" +
                    "type=" + type +
                    ", content='" + content + '\'' +
                    ", sender='" + sender + '\'' +
                    ", to='" + to + '\'' +
                    '}';
        }
    
        public MessageType getType() {
            return type;
        }
    
        public void setType(MessageType type) {
            this.type = type;
        }
    
        public String getContent() {
            return content;
        }
    
        public void setContent(String content) {
            this.content = content;
        }
    
        public String getSender() {
            return sender;
        }
    
        public void setSender(String sender) {
            this.sender = sender;
        }
    
        public String getTo() {
            return to;
        }
    
        public void setTo(String to) {
            this.to = to;
        }
    }

然后是ChatService.java：

import cn.jc.springbootwebsocketdemo.model.ChatMessage;
    import com.alibaba.fastjson.JSONObject;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.messaging.MessagingException;
    import org.springframework.messaging.simp.SimpMessageSendingOperations;
    import org.springframework.stereotype.Service;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    @Service
    public class ChatService {
    
        @Autowired
        private SimpMessageSendingOperations simpMessageSendingOperations;
    
    
        public Boolean sendMsg(String msg) {
            try {
                JSONObject msgJson = JSONObject.parseObject(msg);
                if (msgJson.getString("to").equals("all") && msgJson.getString("type").equals(ChatMessage.MessageType.CHAT.toString())){
                    simpMessageSendingOperations.convertAndSend("/topic/public", msgJson);
               
                }else if (msgJson.getString("to").equals("all") && msgJson.getString("type").equals(ChatMessage.MessageType.JOIN.toString())) {
                    simpMessageSendingOperations.convertAndSend("/topic/public", msgJson);
               
                }else if(msgJson.getString("to").equals("all") &&  msgJson.getString("type").equals(ChatMessage.MessageType.LEAVE.toString())) {
                    simpMessageSendingOperations.convertAndSend("/topic/public", msgJson);
                
                }else if (!msgJson.getString("to").equals("all") &&  msgJson.getString("type").equals(ChatMessage.MessageType.CHAT.toString())){
                    simpMessageSendingOperations.convertAndSendToUser(msgJson.getString("to"),"/topic/msg", msgJson);
                }
            } catch (MessagingException e) {
                e.printStackTrace();
                return false;
            }
            return true;
    
        }
    
    
    }

这个很关键，该实例的点对点推送消息，群发的处理代码都在这个业务处理类里面了，

那么也是稍微做下代码简析：  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 6][]

简单点就是 convertAndSend 和 convertAndSendToUser的使用， 一个是群发，一个是单发（单发会在主题前拼接/user）

还有使用到的json转换工具类，其实也就是fastjosn的方法：

import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    public final class JsonUtil {
        
        /**
         * 把Java对象转换成json字符串
         *
         * @param object 待转化为JSON字符串的Java对象
         * @return json 串 or null
         */
        public static String parseObjToJson(Object object) {
            String string = null;
            try {
                string = JSONObject.toJSONString(object);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
            return string;
        }
    
        /**
         * 将Json字符串信息转换成对应的Java对象
         *
         * @param json json字符串对象
         * @param c    对应的类型
         */
        public static <T> T parseJsonToObj(String json, Class<T> c) {
            try {
                JSONObject jsonObject = JSON.parseObject(json);
                return JSON.toJavaObject(jsonObject, c);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
            return null;
        }
    }

这一小段咱们完成了这几个文件：  
![20200831101241932.png][]

好了，到这里，我们后端的代码也就完成了。

噢对了，还有我们的一个较为关键的，使用@MessageMapping 的 controller，

创建ChatController.java：

import cn.jc.springbootwebsocketdemo.model.ChatMessage;
    import cn.jc.springbootwebsocketdemo.util.JsonUtil;
    import org.springframework.amqp.rabbit.core.RabbitTemplate;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.messaging.handler.annotation.MessageMapping;
    import org.springframework.messaging.handler.annotation.Payload;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import java.security.Principal;
    /**
     * @Author : JCccc
     * @CreateTime : 2020/8/26
     * @Description :
     **/
    @Controller
    public class ChatController {
    
    
        @Autowired
        private RabbitTemplate rabbitTemplate;
    
        /**
         * 服务端推送给单人的接口
         * @param uid
         * @param content
         */
        @ResponseBody
        @GetMapping("/sendToOne")
        public void sendToOne(@RequestParam("uid") String uid,@RequestParam("content") String content ){
    
            ChatMessage chatMessage=new ChatMessage();
            chatMessage.setType(ChatMessage.MessageType.CHAT);
            chatMessage.setContent(content);
            chatMessage.setTo(uid);
            chatMessage.setSender("系统消息");
            rabbitTemplate.convertAndSend("topicWebSocketExchange","topic.public", JsonUtil.parseObjToJson(chatMessage));
    
        }
    
    
        /**
         * 接收 客户端传过来的消息 通过setSender和type 来判别时单发还是群发
         * @param chatMessage
         * @param principal
         */
        @MessageMapping("/chat.sendMessageTest")
        public void sendMessageTest(@Payload ChatMessage chatMessage, Principal principal) {
            try {
    
                String name = principal.getName();
                chatMessage.setSender(name);
                rabbitTemplate.convertAndSend("topicWebSocketExchange","topic.public", JsonUtil.parseObjToJson(chatMessage));
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
    
        }
    
        /**
         * 接收 客户端传过来的消息 上线消息
         * @param chatMessage
         */
        @MessageMapping("/chat.addUser")
        public void addUser(@Payload ChatMessage chatMessage) {
    
            System.out.println("有用户加入到了websocket 消息室" + chatMessage.getSender());
            try {
    
                System.out.println(chatMessage.toString());
                rabbitTemplate.convertAndSend("topicWebSocketExchange","topic.public", JsonUtil.parseObjToJson(chatMessage));
    
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }
    
    }

我们也稍微做个代码简析：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 7][]

那么为了做个简单的实力测试，我们也搞了点页面：

![20200831101343460.png][]

main.css：

* {
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
    }
    
    html,body {
        height: 100%;
        overflow: hidden;
    }
    
    body {
        margin: 0;
        padding: 0;
        font-weight: 400;
        font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
        font-size: 1rem;
        line-height: 1.58;
        color: #333;
        background-color: #f4f4f4;
        height: 100%;
    }
    
    body:before {
        height: 50%;
        width: 100%;
        position: absolute;
        top: 0;
        left: 0;
        background: #128ff2;
        content: "";
        z-index: 0;
    }
    
    .clearfix:after {
        display: block;
        content: "";
        clear: both;
    }
    
    .hidden {
        display: none;
    }
    
    .form-control {
        width: 100%;
        min-height: 38px;
        font-size: 15px;
        border: 1px solid #c8c8c8;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    input {
        padding-left: 10px;
        outline: none;
    }
    
    h1, h2, h3, h4, h5, h6 {
        margin-top: 20px;
        margin-bottom: 20px;
    }
    
    h1 {
        font-size: 1.7em;
    }
    
    a {
        color: #128ff2;
    }
    
    button {
        box-shadow: none;
        border: 1px solid transparent;
        font-size: 14px;
        outline: none;
        line-height: 100%;
        white-space: nowrap;
        vertical-align: middle;
        padding: 0.6rem 1rem;
        border-radius: 2px;
        transition: all 0.2s ease-in-out;
        cursor: pointer;
        min-height: 38px;
    }
    
    button.default {
        background-color: #e8e8e8;
        color: #333;
        box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
    }
    
    button.primary {
        background-color: #128ff2;
        box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
        color: #fff;
    }
    
    button.accent {
        background-color: #ff4743;
        box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
        color: #fff;
    }
    
    #username-page {
        text-align: center;
    }
    
    .username-page-container {
        background: #fff;
        box-shadow: 0 1px 11px rgba(0, 0, 0, 0.27);
        border-radius: 2px;
        width: 100%;
        max-width: 500px;
        display: inline-block;
        margin-top: 42px;
        vertical-align: middle;
        position: relative;
        padding: 35px 55px 35px;
        min-height: 250px;
        position: absolute;
        top: 50%;
        left: 0;
        right: 0;
        margin: 0 auto;
        margin-top: -160px;
    }
    
    .username-page-container .username-submit {
        margin-top: 10px;
    }
    
    
    #chat-page {
        position: relative;
        height: 100%;
    }
    
    .chat-container {
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
        background-color: #fff;
        box-shadow: 0 1px 11px rgba(0, 0, 0, 0.27);
        margin-top: 30px;
        height: calc(100% - 60px);
        max-height: 600px;
        position: relative;
    }
    
    #chat-page ul {
        list-style-type: none;
        background-color: #FFF;
        margin: 0;
        overflow: auto;
        overflow-y: scroll;
        padding: 0 20px 0px 20px;
        height: calc(100% - 150px);
    }
    
    #chat-page #messageForm {
        padding: 20px;
    }
    
    #chat-page ul li {
        line-height: 1.5rem;
        padding: 10px 20px;
        margin: 0;
        border-bottom: 1px solid #f4f4f4;
    }
    
    #chat-page ul li p {
        margin: 0;
    }
    
    #chat-page .event-message {
        width: 100%;
        text-align: center;
        clear: both;
    }
    
    #chat-page .event-message p {
        color: #777;
        font-size: 14px;
        word-wrap: break-word;
    }
    
    #chat-page .chat-message {
        padding-left: 68px;
        position: relative;
    }
    
    #chat-page .chat-message i {
        position: absolute;
        width: 42px;
        height: 42px;
        overflow: hidden;
        left: 10px;
        display: inline-block;
        vertical-align: middle;
        font-size: 18px;
        line-height: 42px;
        color: #fff;
        text-align: center;
        border-radius: 50%;
        font-style: normal;
        text-transform: uppercase;
    }
    
    #chat-page .chat-message span {
        color: #333;
        font-weight: 600;
    }
    
    #chat-page .chat-message p {
        color: #43464b;
    }
    
    #messageForm .input-group input {
        float: left;
        width: calc(100% - 85px);
    }
    
    #messageForm .input-group button {
        float: left;
        width: 80px;
        height: 38px;
        margin-left: 5px;
    }
    
    .chat-header {
        text-align: center;
        padding: 15px;
        border-bottom: 1px solid #ececec;
    }
    
    .chat-header h2 {
        margin: 0;
        font-weight: 500;
    }
    
    .connecting {
        padding-top: 5px;
        text-align: center;
        color: #777;
        position: absolute;
        top: 65px;
        width: 100%;
    }
    
    
    @media screen and (max-width: 730px) {
    
        .chat-container {
            margin-left: 10px;
            margin-right: 10px;
            margin-top: 10px;
        }
    }
    
    @media screen and (max-width: 480px) {
        .chat-container {
            height: calc(100% - 30px);
        }
    
        .username-page-container {
            width: auto;
            margin-left: 15px;
            margin-right: 15px;
            padding: 25px;
        }
    
        #chat-page ul {
            height: calc(100% - 120px);
        }
    
        #messageForm .input-group button {
            width: 65px;
        }
    
        #messageForm .input-group input {
            width: calc(100% - 70px);
        }
    
        .chat-header {
            padding: 10px;
        }
    
        .connecting {
            top: 60px;
        }
    
        .chat-header h2 {
            font-size: 1.1em;
        }
    }

main.js ：

'use strict';
    
    var usernamePage = document.querySelector('#username-page');
    var chatPage = document.querySelector('#chat-page');
    var usernameForm = document.querySelector('#usernameForm');
    var messageForm = document.querySelector('#messageForm');
    var messageInput = document.querySelector('#message');
    var messageArea = document.querySelector('#messageArea');
    var connectingElement = document.querySelector('.connecting');
    
    var stompClient = null;
    var username = null;
    
    var colors = [
        '#2196F3', '#32c787', '#00BCD4', '#ff5652',
        '#ffc107', '#ff85af', '#FF9800', '#39bbb0'
    ];
    
    function connect(event) {
        username = document.querySelector('#name').value.trim();
    
        if(username) {
            usernamePage.classList.add('hidden');
            chatPage.classList.remove('hidden');
    
            var socket = new SockJS('/ws');
            stompClient = Stomp.over(socket);
    
            stompClient.connect({
                username:username
    
            }, onConnected, onError);
        }
        event.preventDefault();
    }
    
    
    function onConnected() {
    
        // Subscribe to the Public Topic
        stompClient.subscribe('/topic/public', onMessageReceived);
    
        //额外订阅了mike频道,暂时当做自己的频道,别人需要特意往这个频道发送消息,才能完成 ‘单对单’
        stompClient.subscribe('/user/topic/msg', onMessageReceived);
    
        // Tell your username to the server
        stompClient.send("/app/chat.addUser",
            {},
            JSON.stringify({sender: username, type: 'JOIN',to:'all'})
        )
    
        connectingElement.classList.add('hidden');
    }
    
    
    function onError(error) {
        connectingElement.textContent = 'Could not connect to WebSocket server. Please refresh this page to try again!';
        connectingElement.style.color = 'red';
    }
    
    
    function sendMessage(event) {
        var messageContent = messageInput.value.trim();
    
        if(messageContent && stompClient) {
            var chatMessage = {
                sender: username,
                content: messageInput.value,
                type: 'CHAT',
                to:'all'
    
            };
            console.log("----- ："+ messageInput.value);
            stompClient.send("/app/chat.sendMessageTest", {}, JSON.stringify(chatMessage));
            messageInput.value = '';
        }
        event.preventDefault();
    }
    
    
    function onMessageReceived(payload) {
        var message = JSON.parse(payload.body);
    
        var messageElement = document.createElement('li');
    
        if(message.type === 'JOIN') {
            messageElement.classList.add('event-message');
            message.content = message.sender + ' 上线~!';
        } else if (message.type === 'LEAVE') {
            messageElement.classList.add('event-message');
            message.content = message.sender + ' 离线了!';
        } else {
            messageElement.classList.add('chat-message');
    
            var avatarElement = document.createElement('i');
            var avatarText = document.createTextNode(message.sender[0]);
            avatarElement.appendChild(avatarText);
            avatarElement.style['background-color'] = getAvatarColor(message.sender);
    
            messageElement.appendChild(avatarElement);
    
            var usernameElement = document.createElement('span');
            var usernameText = document.createTextNode(message.sender);
            usernameElement.appendChild(usernameText);
            messageElement.appendChild(usernameElement);
        }
    
        var textElement = document.createElement('p');
        var messageText = document.createTextNode('消息：'+message.content);
        textElement.appendChild(messageText);
    
        messageElement.appendChild(textElement);
    
        messageArea.appendChild(messageElement);
        messageArea.scrollTop = messageArea.scrollHeight;
    }
    
    
    function getAvatarColor(messageSender) {
        var hash = 0;
        for (var i = 0; i < messageSender.length; i++) {
            hash = 31 * hash + messageSender.charCodeAt(i);
        }
    
        var index = Math.abs(hash % colors.length);
        return colors[index];
    }
    
    usernameForm.addEventListener('submit', connect, true)
    messageForm.addEventListener('submit', sendMessage, true)

这里我们需要注意一些用法：

连接方法：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 8][]

同时在连接时，触发的方法OnConnected：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 9][]

发送消息方法sendMessage：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 10][]

最后时咱们的客户端测试页面，index.html：

<!DOCTYPE html>
    <html>
      <head>
          <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
          <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
          <title>Spring Boot WebSocket Chat Application | CalliCoder</title>
          <link rel="stylesheet" href="/css/main.css" />
      </head>
      <body>
        <noscript>
          <h2>Sorry! Your browser doesn't support Javascript</h2>
        </noscript>
    
        <div id="username-page">
            <div class="username-page-container">
                <h1 class="title">接收消息测试</h1>
                <form id="usernameForm" name="usernameForm">
                    <div class="form-group">
                        <input type="text" id="name" placeholder="Username" autocomplete="off" class="form-control" />
                    </div>
                    <div class="form-group">
                        <button type="submit" class="accent username-submit">进入消息接收室</button>
                    </div>
                </form>
            </div>
        </div>
    
        <div id="chat-page" class="hidden">
            <div class="chat-container">
                <div class="chat-header">
                    <h2>消息测试</h2>
                </div>
                <div class="connecting">
                    Connecting...
                </div>
                <ul id="messageArea">
    
                </ul>
                <form id="messageForm" name="messageForm" nameForm="messageForm">
                    <div class="form-group">
                        <div class="input-group clearfix">
                            <input type="text" id="message" placeholder="Type a message..." autocomplete="off" class="form-control"/>
                            <button type="submit" class="primary">Send</button>
                        </div>
                    </div>
                </form>
            </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="/js/main.js"></script>
      </body>
    </html>

到这里，这个实例的前后端咱们总算是完毕了。

ps：  application.properties 项目配置文件咱们就开了个端口

![20200831103211916.png][]

进入实操演练环节， 运行项目：

先不着急，我们登录rabbitmq的管理页面看一眼（[http://localhost:15672][http_localhost_15672]）：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 11][]

其余的队列啥的，自己看看咯，不多介绍了。

打开第一个页面index.html：

我们输入一个客户端用户识别信息， A1001  连接后端weboscket节点。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 12][]

这时候，先看一眼控制台，

### 流程： ###

**没错在连接上后端服务节点的时候携带的A1001已经被我们的拦截器拦截，也设置了用户认证信息；**

**而且也执行了onConnected方法，往/app/chat.addUser 推送了一条加入消息，对应到的就是ChatController里的@MessageMapping("/chat.sendMessageTest") 方法；**

**然后推送成功触发了回调函数，且与此同时消费者监听器也消费了下来，并且调用chatService里的方法，将消息判断时群发或者单发后进行最终的推送：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 13][]

事不宜迟，我们再打开一个index.html，以 B2002  连接 进入：  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 14][]

可以看到，A1001 和 B2002 都能收到上线消息：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 15][]

OK，接下来，A1001  与 B2002 随便发送点消息 （其实就是调用js里的sendMessage方法）：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 16][]

ok，群发功能也就这样测试完了。

接下来我们来看看单独推送，我们以接口方法来模拟下我们服务端给指定用户推送消息，单发（点对点）：

那么我们调用的接口就是，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 17][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 18][]

可以看到，我们给 B2002 单独推送了一条消息：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 19][]

ps： 系统给用户单独推送消息学会了，那么用户直接互相推送也就自然明白了。只是把发送者从系统改为具体的用户id.

ok，到此。

[https_blog.csdn.net_qq_35387940_article_details_93483678]: https://blog.csdn.net/qq_35387940/article/details/93483678
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70]: /images/20221123/59c1dbc233fe4e92b141ef9014dcfe3d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 1]: /images/20221123/2609d160561747f9970d2d4898499637.png
[20200831093903807.png]: /images/20221123/4edaf55a33dd44a380645d937eabd376.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 2]: /images/20221123/e7bdfae1d5214d799dbe1daeff89abe3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 3]: /images/20221123/c80aab58c6604a769e6d267ed7dee263.png
[https_blog.csdn.net_qq_35387940_article_details_100514134]: https://blog.csdn.net/qq_35387940/article/details/100514134
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 4]: /images/20221123/a383562878df4788bb75b29755eaf3a2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 5]: /images/20221123/9c84e3cd63d14d748dd36c5bd1ff3161.png
[20200831095827920.png]: /images/20221123/d556693ba83046758ecd11cb5efc00e1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 6]: /images/20221123/ba012265b47e4f7eaffeb31a8228c07b.png
[20200831101241932.png]: /images/20221123/2e0256b25c834f3daf6d6bc0a4108365.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 7]: /images/20221123/be4cfdfdd1994ade81b4d6dd202a41a0.png
[20200831101343460.png]: /images/20221123/381d3823e8924a3d9df8f654ff802d44.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 8]: /images/20221123/195573a466244eea9b5064a5dfda9919.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 9]: /images/20221123/3ff3b13c6dc0452ba0e3a23b76abf8d6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 10]: /images/20221123/189bc569ecf644669ca9d2a7458674fc.png
[20200831103211916.png]: /images/20221123/45dc4c7c4af54a729d1b2feaff896e51.png
[http_localhost_15672]: http://localhost:15672
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 11]: /images/20221123/d58a2b2f4669415c873867f216e8e0e8.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 12]: /images/20221123/26b03bfcfe764cf1803ed0770c6ccfa2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 13]: /images/20221123/e85d859ecf4f428ab7244b14359be8b0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 14]: /images/20221123/1798ef0684c545538b91ab693059763b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 15]: /images/20221123/df720807ae024fdc850297ba47da11ca.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 16]: /images/20221123/209c5846c6994b1ebcf00d056274e82a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 17]: /images/20221123/23ef1a85bd6f44ea906b10812632ca4b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 18]: /images/20221123/1005fa18ebb64b0797b4c506834827d4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70 19]: /images/20221123/d44eb5c8080141cb8fe70fff60261e28.png