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Java中给项目程序添加log主要有三种方式，一使用JDK中的java.util.logging包，一种是log4j，一种是commons-logging。其中log4j和commons-logging都是apache软件基金会的开源项目。这三种方式的区别如下：

Java.util.logging，JDK标准库中的类，是JDK 1.4 版本之后添加的日志记录的功能包。

log4j，最强大的记录日志的方式。可以通过配置 .properties 或是 .xml 的文件，配置日志的目的地，格式等等。

commons-logging，最综合和常见的日志记录方式，是Java中的一个日志接口，一般会与log4j一起使用。自带SimpleLog可用于日志记录。

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>

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log4j.rootLogger=CONSOLE,FILE
log4j.addivity.org.apache=true
# 应用于控制台
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=DEBUG
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n
# 每天新建日志
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=../logs/testimaplog
log4j.appender.A1.Encoding=UTF-8
log4j.appender.A1.Threshold=DEBUG
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n
#应用于文件
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=../logs/testimaplog/log
log4j.appender.FILE.Append=false
log4j.appender.FILE.Encoding=UTF-8
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
<version>1.5.3.RELEASE</version>
</dependency>

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log.path=../logs/imap-api/logs
log.name=imap.log
log.name.error=imap-error.log

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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<property resource="config/logback.properties" />
<appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
<Target>System.out</Target>
<encoder>
<pattern>%d [%t] %p %logger - %m%n</pattern>
</encoder>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>DEBUG</level>
</filter>
</appender>
<appender name="LogFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${log.path}/${log.name}</File>
<Append>true</Append>
<encoder>
<pattern>%d [%t] %p %logger{0} - %m%n</pattern>
</encoder>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>INFO</level>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.path}/${log.name}.%d{yyyy-MM-dd}</fileNamePattern>
</rollingPolicy>
</appender>
<appender name="ErrorFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${log.path}/${log.name.error}</File>
<encoder>
<pattern>%d [%t] %p %logger{0} - %m%n</pattern>
</encoder>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>ERROR</level>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.path}/${log.name.error}.%d{yyyy-MM-dd}</fileNamePattern>
</rollingPolicy>
<encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
<providers>
<mdc/>
<timestamp/>
<version/>
<pattern>
<pattern>
{"provider": "test"}
</pattern>
</pattern>
<message/>
<loggerName/>
<logLevel/>
<callerData/>
<context/>
<stackTrace/>
<arguments/>
<logstashMarkers/>
</providers>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="Console"/>
<appender-ref ref="LogFile"/>
<appender-ref ref="ErrorFile"/>
</root>
</configuration>

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