SpringBoot 整合Logback框架

新日志框架LogBack介绍

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配置===========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

SpringBoot2.x日志讲解和自定义Logback配置实战

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

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

文件位置位于resource目录下

编写controller 测试

package vip.buildup.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;
//封装的消息返回
import vip.buildup.demo.domain.JsonData;

@RestController
@RequestMapping("/api/v2")
public class TestLogBackController {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    @GetMapping("test_log")
    public Object testLog() {
        logger.debug("this is debug level");
        logger.info("this is debug level");
        logger.warn("this is debug level");
        logger.error("this is debug level");
        return JsonData.buildSuccess();
    }   
}

测试接口后，刷新项目，项目路径下生成app_log目录，目录下生成日志文件。