【SpringBoot】Logback日志框架介绍和SpringBoot整合实战

========================11、Logback日志框架介绍和SpringBoot整合实战 2节课================================

1、新日志框架LogBack介绍
简介：日志介绍和新日志框架Logback讲解

1.常用处理java的日志组件 slf4j,log4j,logback,common-logging 等

2、logback介绍：基于Log4j基础上大量改良，不能单独使用，推荐配合日志框架SLF4J来使用
logback当前分成三个模块：logback-core,logback-classic和logback-access;
logback-core是其它两个模块的基础模块

3、Logback的核心对象：
Logger：日志记录器
Appender：指定日志输出的目的地，目的地可以是控制台，文件
Layout：日志布局 格式化日志信息的输出

4、日志级别：DEBUG < INFO < WARN < ERROR

===========log4j示例===========
### 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=D://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D://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=D://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

===========logback============

4、Log4j日志转换为logback在线工具（支持log4j.properties转换为logback.xml,不支持 log4j.xml转换为logback.xml）
https://logback.qos.ch/translator/

2、SpringBoot2.x日志讲解和自定义Logback配置实战
简介：讲解SpringBoot2.x整合Logback配置实战

1、官网介绍：https://docs.spring.io/spring-boot/docs/2.1.0.BUILD-SNAPSHOT/reference/htmlsingle/#boot-features-logging

各个组件案例：https://logback.qos.ch/manual/index.html

2、分析SpringBoot启动日志
1）默认情况下，Spring Boot将日志输出到控制台

3、整合Logback实战
1）创建 日志文件logback-spring.xml，官方推荐 -spring.xml结尾
默认加载加载配置顺序 logback-spring.xml, logback-spring.groovy, logback.xml, or logback.groovy

注释：
<configuration> 子节点
<appender></appender>
<logger></logger>
<root></root>(要加在最后)

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

     <appender name="consoleApp" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </layout>
    </appender>

    <appender name="fileInfoApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
             <level>ERROR</level>
            <onMatch>DENY</onMatch>
            <onMismatch>ACCEPT</onMismatch>
        </filter>
        <encoder>
            <pattern>
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </encoder>
        <!-- 滚动策略 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 路径 -->
            <fileNamePattern>app_log/log/app.info.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>

    <appender name="fileErrorApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
        </filter>
        <encoder>
            <pattern>
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </encoder>

        <!-- 设置滚动策略 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 路径 -->
            <fileNamePattern>app_log/log/app.err.%d.log</fileNamePattern>

            <!-- 控制保留的归档文件的最大数量，超出数量就删除旧文件，假设设置每个月滚动，
            且<maxHistory> 是1，则只保存最近1个月的文件，删除之前的旧文件 -->
             <MaxHistory>1</MaxHistory>

        </rollingPolicy>
    </appender>
   <root level="INFO">
        <appender-ref ref="consoleApp"/>
        <appender-ref ref="fileInfoApp"/>
        <appender-ref ref="fileErrorApp"/>
    </root>
</configuration>

xml

package net.xdclass.base_project.controller;

import net.xdclass.base_project.domain.JsonData;

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")
public class UserController {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @GetMapping("log")
    public Object testLog(){

        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 JsonData.buildSuccess();
    }

}

Controller