Java程序打印日志

一、maven依赖

POM文件中添加以下依赖，maven依赖的jar包版本可以在maven central repository 查看

<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.34</version><scope>compile</scope>
</dependency>
<dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>2.0.13</version><scope>compile</scope>
</dependency>
<dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>2.0.13</version><scope>compile</scope>
</dependency>
<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-to-slf4j</artifactId><version>2.23.1</version><scope>compile</scope>
</dependency>
<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>2.23.1</version><scope>compile</scope>
</dependency>
<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.23.1</version><scope>compile</scope>
</dependency>

二、配置文件

在resources目录下新建log4j.properties配置文件，配置内容如下。

#指定打印级别和打印位置
log4j.rootLogger=DEBUG,console,infoFile,errorFile#控制台输出
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Target=System.out
log4j.appender.console.Threshold=INFO
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%-5p] [%t] - [%X{traceId}] - %c.%M():%L - %m%n#输出info日志
log4j.appender.infoFile=org.apache.log4j.RollingFileAppender
log4j.appender.infoFile.File=./log/info.log
log4j.appender.infoFile.MaxFileSize=50mb
log4j.appender.infoFile.Threshold=INFO
log4j.appender.infoFile.layout=org.apache.log4j.PatternLayout
log4j.appender.infoFile.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%-5p] [%t] - [%X{traceId}] - %c.%M():%L - %m%n#info日志中指定打印的最低级别和最高级别
log4j.appender.infoFile.filter.infoFilter=org.apache.log4j.varia.LevelRangeFilter
log4j.appender.infoFile.filter.infoFilter.levelMin=INFO
log4j.appender.infoFile.filter.infoFilter.levelMax=INFO#输出error日志
log4j.appender.errorFile=org.apache.log4j.RollingFileAppender
log4j.appender.errorFile.File=./log/error.log
log4j.appender.errorFile.MaxFileSize=50mb
log4j.appender.errorFile.Threshold=ERROR
log4j.appender.errorFile.layout=org.apache.log4j.PatternLayout
log4j.appender.errorFile.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%-5p] [%t] - [%X{traceId}] - %c.%M():%L - %m%n#打印sql日志
log4j.logger.org.mybatis=INFO
log4j.logger.java.sql=INFO
log4j.logger.java.sql.Statement=INFO
log4j.logger.java.sgl.ResultSet=INFO
log4j.logger.java.sq1.PreparedStatement=INFO