帮助文档:
https://docs.spring.io/spring-boot/docs/2.1.0.BUILD-SNAPSHOT/reference/htmlsingle/#boot-feature-logging
log4j.properties转换logback.xml
https://logback.qos.ch/translator/https://logback.qos.ch/manual/index.html
转换前代码:
### 设置###
log4j.rootLogger = debug,stdout,D,E
### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
### 输出ERROR 级别以上的日志到=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
1.添加pom.xml的依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>top.ytheng</groupId>
<artifactId>springboot-demo</artifactId>
<version>0.0.1</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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-thymeleaf</artifactId>
</dependency>
<!-- 热部署 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
</dependencies>
<build>
<!-- 打包的名称 -->
<finalName>myspringboot</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.添加lockback-spring.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<!-- 日志记录器,日期滚动记录 -->
<appender name="fileInfoApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
<!-- 正在记录的日志文件的路径及文件名 -->
<!-- <file>${LOG_PATH}/warn/log_warn.log</file> -->
<!-- 日志记录器的滚动策略,按日期,按大小记录 -->
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!-- 归档的日志文件的路径,例如今天是2013-12-21日志,当前写的日志文件路径为file节点指定,可以将此文件与file指定文件路径设置为不同路径,从而将当前日志文件或归档日志文件置不同的目录。
而2013-12-21的日志文件在由fileNamePattern指定。%d{yyyy-MM-dd}指定日期格式,%i指定索引 -->
<fileNamePattern>app_log/log/log-error-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
<!-- 表示只保留最近30天的日志,以防止日志填满整个磁盘空间。-->
<maxHistory>30</maxHistory>
<!--用来指定日志文件的上限大小,例如设置为1GB的话,那么到了这个值,就会删除旧的日志。-->
<totalSizeCap>1GB</totalSizeCap>
<!-- 除按日志记录之外,还配置了日志文件不能超过2M,若超过2M,日志文件会以索引0开始,命名日志文件,例如log-error-2013-12-21.0.log -->
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>2MB</maxFileSize>
</timeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>
<!-- 追加方式记录日志 -->
<append>true</append>
<!-- 日志文件的格式 -->
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>===%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger Line:%-3L - %msg%n</pattern>
<charset>utf-8</charset>
</encoder>
<!-- 此日志文件只记录war级别的 -->
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<!-- 只保留error日志 -->
<!-- level:debug,info,warn,error -->
<level>ERROR</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
</appender>
<!-- root节点要放到appender之后 -->
<root level="INFO">
<appender-ref ref="STDOUT" />
<appender-ref ref="fileInfoApp" />
</root>
</configuration>
3.添加控制器
package top.ytheng.demo.controller;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/api/v1/log")
public class LogController {
private Logger logger = LoggerFactory.getLogger(this.getClass());
@GetMapping("/test")
public Object test() {
logger.debug("this is debug level");
logger.info("this is info level");
logger.warn("this is warn level");
logger.error("this is error level");
return "success";
}
}
4.添加启动类
package top.ytheng.demo;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication //等于下面3个
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
5.右键项目Rum As启动,访问地址
http://localhost:8080/api/v1/log/test
如图:

另附:

转载:
https://www.cnblogs.com/xm-02/p/9109563.html
来源:https://www.cnblogs.com/tianhengblogs/p/9826212.html