SpringBoot集成websocket发送后台日志到前台页面
阅读原文时间:2023年07月08日阅读:17

业务需求

后台为一个采集系统,需要将采集过程中产生的日志实时发送到前台页面展示,以便了解采集过程。

技能点

  • SpringBoot 2.x
  • websocket
  • logback
  • thymeleaf
  • RabbitMQ

之所以使用到RabbitMQ是因为实际环境中采集服务为多个,为了统一处理日志信息,将日志都先灌入mq中,再统一从mq中进行消费

引入关键pom

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

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

<!--rabbitmq -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

logback配置文件引入AmqpAppender

<springProperty scope="context" name="rabbitmq-address" source="spring.rabbitmq.addresses" defaultValue="127.0.0.1:5672" />
<springProperty scope="context" name="rabbitmq-username" source="spring.rabbitmq.username" defaultValue="guest" />
<springProperty scope="context" name="rabbitmq-password" source="spring.rabbitmq.password" defaultValue="guest" />
<springProperty scope="context" name="rabbitmq-virtual-host" source="spring.rabbitmq.virtual-host" defaultValue="/" />
<springProperty scope="context" name="exhcange-name" source="platform.parameter.exhcangeName" defaultValue="default-exchange" />
<springProperty scope="context" name="binding-key" source="platform.parameter.bindingKey" defaultValue="default-routing" />

<appender name="RabbitMq"  class="org.springframework.amqp.rabbit.logback.AmqpAppender">
    <layout>
        <pattern>[%X{traceId}] - %d{HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern>     <!--<1>-->
    </layout>
    <!--rabbitmq地址 -->
    <addresses>${rabbitmq-address}</addresses>
    <username>${rabbitmq-username}</username>
    <password>${rabbitmq-password}</password>
    <virtualHost>${rabbitmq-username}</virtualHost>

    <declareExchange>false</declareExchange>
    <exchangeType>direct</exchangeType>
    <exchangeName>${exhcange-name}</exchangeName>
    <routingKeyPattern>${binding-key}</routingKeyPattern>
    <generateId>true</generateId>
    <charset>UTF-8</charset>
    <durable>true</durable>
    <deliveryMode>NON_PERSISTENT</deliveryMode>
    <filter class="com.log.websocket.stomp.LogFilter">
        <level>INFO</level>
    </filter>
</appender>

<springProfile name="dev">
    <root level="debug">
        <appender-ref ref="RabbitMq" />
    </root>
</springProfile>

日志过滤器

logback配置文件中添加的AmqpAppender使用了filter,具体的filter如下所示:

public class LogFilter extends AbstractMatcherFilter<ILoggingEvent> {

    Level level;

    @Override
    public FilterReply decide(ILoggingEvent event) {
        if (!isStarted()) {
            return FilterReply.NEUTRAL;
        }
        //过滤指定级别的日志
        if(event.getLevel().equals(level)){
            Map<String, String> mdcMap = event.getMDCPropertyMap();
            String tracId = mdcMap.get("traceId");
            //过滤日志中带有traceId的日志,其他的不需要,traceId使用aop添加
            if(StringUtils.isNotBlank(tracId)){
                return FilterReply.ACCEPT;
            }
        }
        return FilterReply.DENY;
    }

    public void setLevel(Level level) {
        this.level = level;
    }

    @Override
    public void start() {
        if (this.level != null) {
            super.start();
        }
    }
}

说明:

AmqpAppender中的filter设置了过滤级别,因此只过滤指定级别的日志;

过滤日志中带有traceId的日志,traceId通过aop添加,具体参考后面的aop设置;

aop方式添加traceId

编写LogAspect如下所示:

@Order(1)
@Aspect
@Component
public class LogAspect {

    /**
     * 所有的业务类的类名都是xxSpiderxxImpl,统一入口都是gatherData方法
     */
    @Pointcut("execution(* com.log..*.service..*Spider*Impl.gatherData(..))")
    public void pointCut() {}

    @Before("pointCut()")
    public void before(JoinPoint joinPoint){
        //切点已经确定是com.log..*.service..*Spider*Impl.gatherData(..),该方法的参数只有一个,且为GatherTaskVO
        GatherTaskVO vo = (GatherTaskVO)joinPoint.getArgs()[0];
        //将任务id作为traceId
        MDC.put("traceId", vo.getId());
    }

    @After("pointCut()")
    public void after(JoinPoint joinPoint){
        //方法执行完成以后,删除traceId
        MDC.remove("traceId");
    }
}

解释一下MDC:

对于多个线程同时执行的系统或者分布式系统中,各个线程的日志穿插执行,导致我们无法直观的直接定位整个操作流程,因此,我们需要对一个线程的操作流程进行归类标记,比如使用线程+时间戳或者用户id等,从而使我们能够从混乱的日志中梳理处整个线程的操作流程,因此Slf4j的MDC应运而生,logback和log4j支持MDC。

MDC中提供的方法如下所示;

package org.jboss.logging;

import java.util.Collections;
import java.util.Map;

/**
 * 删除了非必须代码以及注释
 * Mapped diagnostic context. Each log provider implementation may behave different.
 */
public final class MDC {

   //uts the value onto the context.
    public static Object put(String key, Object val);

    //Returns the value for the key or {@code null} if no value was found.
    public static Object get(String key);

    //Removes the value from the context.
    public static void remove(String key);

   //Clears the message diagnostics context.
    public static void clear();
}

MDC提供的方法比较简单,使用也很简单,只需要将指定的值put到线程上下文中,在对应的地方调用get方法获取到值即可。

注意看上述AmqpAppender配置中标记<1>中的traceId即为我们此处添加到线程上下文中的值,如下所示

<layout>
    <pattern>[%X{traceId}] - %d{HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern>
</layout>

开启websocket支持

Springboot环境下注入ServerEndpointExporter以开启websocket支持

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

websocketServer

websocketServer用来开启连接,关闭连接以及接收消息等

@Slf4j
@ServerEndpoint("/socketserver/{taskId}")
@Component
public class WebSocketServer {
    /**concurrent包的线程安全Set,用来存放每个客户端对应的MyWebSocket对象。*/
    private static ConcurrentHashMap<String,WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**与某个客户端的连接会话,需要通过它来给客户端发送数据*/
    private Session session;
    /**接收taskId*/
    private String taskId="";

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("taskId") String taskId) {
        this.session = session;
        this.taskId=taskId;
        if(webSocketMap.containsKey(taskId)){
            webSocketMap.remove(taskId);
            webSocketMap.put(taskId,this);
        }else{
            webSocketMap.put(taskId,this);
        }
        try {
            sendMessage("socket连接成功");
        } catch (IOException e) {
            log.error("socket>>"+taskId+",网络异常!!!!!!");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if(webSocketMap.containsKey(taskId)){
            webSocketMap.remove(taskId);
        }
    }

    /**
     * 收到客户端消息后调用的方法
     * TODO 客户端交互使用,暂无用到
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("socket>>>:"+taskId+",报文:"+message);
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:"+this.taskId+",原因:"+error.getMessage());
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        //加锁,否则会出现java.lang.IllegalStateException: The remote endpoint was in state [TEXT_FULL_WRITING] which is an invalid state for called method异常,并发使用session发送消息导致的
        synchronized (this.session){
            this.session.getBasicRemote().sendText(message);
        }
    }

    public ConcurrentHashMap<String,WebSocketServer> getWebSocketMap(){ return webSocketMap; }
}

前台页面

前台页面使用js来调用websocket,请求websocketserver打开socket连接,并且开始和后台交互发送消息

<!DOCTYPE html >
<html xmlns:th="http://www.thymeleaf.org" >
<head>
    <meta charset="utf-8">
    <title>任务日志展示</title>
</head>
<body>
<script th:src="@{/js/jquery.min.js}"></script>
<input type="hidden" id="gather_task_id" th:value="${taskId}" />
<script>

    var socket;
    function openSocket() {
        var detailDiv = $("#log_detail");
        var taskId = $("#gather_task_id").val();
        //实现化WebSocket对象,指定要连接的服务器地址与端口  建立连接
        var socketUrl="http://localhost:8888/socketserver/"+taskId;
        socketUrl=socketUrl.replace("https","ws").replace("http","ws");
        if(socket!=null){
            socket.close();
            socket=null;
        }
        socket = new WebSocket(socketUrl);
        //打开事件
        socket.onopen = function() {
            console.log("websocket已打开");
        };
        //获得消息事件
        socket.onmessage = function(msg) {
            console.log(msg.data);
            //发现消息进入    开始处理前端触发逻辑
            detailDiv.append("<p>"+msg.data+"</p>")
        };
        //关闭事件
        socket.onclose = function() {
            console.log("websocket已关闭");
        };
        //发生了错误事件
        socket.onerror = function() {
            console.log("websocket发生了错误");
        }
    }
    function sendMessage() {
        if(typeof(WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
        }else {
            console.log("您的浏览器支持WebSocket");
            console.log('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
            socket.send('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
        }
    }

    function printLog(){
        if(typeof(WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
            alert("您的浏览器不支持WebSocket");
        }else {
            openSocket();
        }
    }

    function quit(){
        if(socket!=null){
            socket.close();
            socket=null;
            var detailDiv = $("#log_detail");
            detailDiv.append("<p>客户端已退出</p>")
        }
    }
</script>

<a href="javascript:void(0);" onclick="printLog()" >打印日志</a>
<a href="javascript:void(0);" onclick="quit()">退出</a>
<div id="log_detail">

</div>
</body>

</html>

消费mq中的日志消息

service中产生的日志是添加到mq队列中的,因此需要一个消费者消费队列中的数据,并且使用websocketserver将消息发送到对应的页面上,从而在页面上进行展示

@Component
@Slf4j
public class LogConsumer {
    @Resource
    private WebSocketService webSocketService;

    @RabbitHandler
    @RabbitListener(
            bindings = @QueueBinding(
                    value = @Queue(name = "${platform.parameter.queueName}",durable = "true"),
                    exchange = @Exchange(name = "${platform.parameter.exhcangeName}",ignoreDeclarationExceptions="true",durable = "true"),
                    key = "${platform.parameter.bindingKey}"
            ),
            concurrency = "2"
    )
    public void listennerPush(String msg, Channel channel, Message message) throws IOException {
        try {
            log.debug("consumer>>>接收到的消息>>>{}",msg);
            //[1] - 13:15:17.484 - TwitterSpiderMobileService实现类方法<<<<任务id:1
            msg.split(" - ")[0].trim().replace("[","").replace("]","");
            String tracId =  msg.substring(0,msg.indexOf(" - ")).trim().replace("[","").replace("]","");
            msg = msg.substring(msg.indexOf(" - ")+2);
            //调用websocket发送日志信息到页面上
            webSocketService.sendMessage(tracId,msg);
        } catch (Exception e) {
            log.error("获取消息失败,异常原因:{}",e.getMessage(),e);
        } finally {
            channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
        }
    }
}

sendMessage方法如下所示:

@Override
public void sendMessage(String taskId, String logMessage) {
    try {
        ConcurrentHashMap<String, WebSocketServer> map =  webSocketServer.getWebSocketMap();
        WebSocketServer server =  map.get(taskId);
        if(server!=null){
            server.sendMessage(logMessage);
        }else{
            log.warn("客户端已退出");
        }
    } catch (IOException e) {
        log.error("向客户端发送消息时出现异常,异常原因:{}",e.getMessage(),e);
    }
}

最终效果图

经过以上步骤即可将service中生成的日志接近实时的显示在前台页面上,最后的显示效果如下所示:

参考资料

1.SpringBoot2.0集成WebSocket,实现后台向前端推送信息

本文所对应的代码已上传gitee,有需要的可以自行下载。

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