基于spring boot 和MDC实现同一笔记录的日志跟踪实现--1.filter

同一个项目中，一般包含controller/servlet、service、dao等。1笔记录的日志贯穿于controller、service、dao中，在并发情况下，那如何找出该笔日志？

可通过以下三种方式实现：

1、filter：依赖servlet容器

2、Interceptor：依赖spring

3、AOP：spring boot中，不能拦截servlet（我试过的，但可能也行）

以下时filter的实现。

首先，包结构：

代码实现：

logback.xml

<?xml version="1.0" encoding="UTF-8"?>

<configuration debug="false">

    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">

        <encoder>

            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%X{requestId}] %p | %logger{20}.%M:%L - %m%n</pattern>

        </encoder>

    </appender>

    <!-- TRACE < DEBUG < INFO < WARN < ERROR -->

    <root level="INFO">

        <appender-ref ref="console"/>

    </root>

</configuration>

MdcLogEnhancerFilter

package com.ebc.slf4j.mdc.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import org.slf4j.MDC;

import org.springframework.stereotype.Component;

import cn.hutool.core.lang.Console;

import cn.hutool.core.util.IdUtil;

@Component

public class MdcLogEnhancerFilter implements Filter {

    @Override

    public void destroy() {

    }

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)

            throws IOException, ServletException {

        MDC.put("requestId", IdUtil.objectId());

        filterChain.doFilter(servletRequest, servletResponse);

        MDC.remove("requestId");//否则内存溢出

        //Console.log("======{}",MDC.get("requestId"));//输出null

    }

}

Application

package com.ebc.slf4j.mdc;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication

@ServletComponentScan(basePackages="com.ebc.slf4j.mdc.servlet")

public class Application {

    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

}

下边是业务类

M2Servlet

package com.ebc.slf4j.mdc.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import lombok.extern.slf4j.Slf4j;

import org.springframework.web.context.WebApplicationContext;

import org.springframework.web.context.support.WebApplicationContextUtils;

import com.ebc.slf4j.mdc.service.WelcomeService;

@WebServlet("/M2Servlet")

@Slf4j

public class M2Servlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        log.info("进入了servlet");

        WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

        WelcomeService welcomeService = (WelcomeService) wac.getBean("welcomeService");

        String reStr = welcomeService.exec("遥远2");

        log.info("service返回：{}",reStr);

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);

    }

}

WelcomeService

package com.ebc.slf4j.mdc.service;

import lombok.extern.slf4j.Slf4j;

import org.springframework.stereotype.Service;

@Service

@Slf4j

public class WelcomeService {

    public String exec(String name) {

        log.info("service接收到：{}",name);

        return "hello "+name;

    }

}

执行：http://localhost:8080/M2Servlet

结果：

2019-01-22 11:22:03.900 [5c468c5bcbb014209e2ea828] INFO | c.e.s.m.s.M2Servlet.doGet:20 - 进入了servlet

2019-01-22 11:22:03.900 [5c468c5bcbb014209e2ea828] INFO | c.e.s.m.s.WelcomeService.exec:11 - service接收到：遥远2

2019-01-22 11:22:03.900 [5c468c5bcbb014209e2ea828] INFO | c.e.s.m.s.M2Servlet.doGet:24 - service返回：hello 遥远2

巴特西

基于spring boot 和MDC实现同一笔记录的日志跟踪实现--1.filter

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巴特西

基于spring boot 和MDC实现 同一笔记录的日志跟踪实现--1.filter

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基于spring boot 和MDC实现同一笔记录的日志跟踪实现--1.filter