SpringBoot应用与原理之集成Log4j2

小咪咪 2022-05-30 10:23 175阅读 0赞

## 一 本章概述 ##

SpringBoot应用替换默认的Logback日之框架，采用Log4j2实现

## 二 SpringBoot应用集成Log4j2 ##

1 替换默认的logback

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

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2 加入基于SpringBoot的Log4j2 Starter

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-log4j2</artifactId>
            </dependency>

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3 配置log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
    
    <configuration status="warn">
        <properties>
    
            <Property name="app_name">springboot-web</Property>
            <Property name="log_path">logs/${app_name}</Property>
    
        </properties>
        <appenders>
            <console name="Console" target="SYSTEM_OUT">
                <PatternLayout pattern="[%d][%t][%p][%l] %m%n" />
            </console>
    
            <RollingFile name="RollingFileInfo" fileName="${log_path}/info.log" filePattern="${log_path}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz">
                <Filters>
                    <ThresholdFilter level="INFO" />
                    <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL" />
                </Filters>
                <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" />
                <Policies>
                    
                    <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                    
                    <SizeBasedTriggeringPolicy size="2 MB" />
                </Policies>
                
                <DefaultRolloverStrategy compressionLevel="0" max="10"/>
            </RollingFile>
    
            <RollingFile name="RollingFileWarn" fileName="${log_path}/warn.log" filePattern="${log_path}/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz">
                <Filters>
                    <ThresholdFilter level="WARN" />
                    <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL" />
                </Filters>
                <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" />
                <Policies>
                    
                    <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                    
                    <SizeBasedTriggeringPolicy size="2 MB" />
                </Policies>
                
                <DefaultRolloverStrategy compressionLevel="0" max="10"/>
            </RollingFile>
    
            <RollingFile name="RollingFileError" fileName="${log_path}/error.log" filePattern="${log_path}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz">
                <ThresholdFilter level="ERROR" />
                <PatternLayout pattern="[%d][%t][%p][%c:%L] %m%n" />
                <Policies>
                    
                    <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                    
                    <SizeBasedTriggeringPolicy size="2 MB" />
                </Policies>
                
                <DefaultRolloverStrategy compressionLevel="0" max="10"/>
            </RollingFile>
    
            
        </appenders>
    
        <loggers>
            
    
            <root level="info">
                <appender-ref ref="Console" />
                <appender-ref ref="RollingFileInfo" />
                <appender-ref ref="RollingFileWarn" />
                <appender-ref ref="RollingFileError" />
                
            </root>
    
        </loggers>
    
    </configuration>

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4 配置appliaction.properties

logging.config=classpath:log4j2.xml

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三 Log4j2的应用

package com.ekeyfund.framework.springboot.web.controller;
    
    import org.apache.logging.log4j.LogManager;
    import org.apache.logging.log4j.Logger;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * IndexController * * @author tony 18601767221@163.com * @create 2017-09-14-下午4:51 * @see * @since JDK1.8u141 */
    @RestController
    public class IndexController { 
    
    
        private static final Logger logger = LogManager.getLogger(IndexController.class);
    
        @GetMapping("/index")
        public String index(){
    
            for(int i=0;i<10_0000;i++){
                logger.info("info execute index method");
                logger.warn("warn execute index method");
                logger.error("error execute index method");
    
            }
    
    
            return "My First SpringBoot Application";
        }
    }

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启动应用会发现日志会根据不同的级别存储在不同的文件，当日志文件大小超过2M以后会分多个文件压缩存储，生产环境的日志文件大小建议调整为20-50MB。

> [http://blog.csdn.net/ittechnologyhome/article/details/78070876][http_blog.csdn.net_ittechnologyhome_article_details_78070876]  
>

[http_blog.csdn.net_ittechnologyhome_article_details_78070876]: http://blog.csdn.net/ittechnologyhome/article/details/78070876