[问题记录]log4j使用记录

朱雀 2022-03-26 05:07 327阅读 0赞

转自：[https://blog.csdn.net/yeweiouyang/article/details/53645458][https_blog.csdn.net_yeweiouyang_article_details_53645458]

**步骤一：maven配置依赖**

[https://mvnrepository.com/artifact/log4j/log4j/1.2.16][https_mvnrepository.com_artifact_log4j_log4j_1.2.16]

**步骤二：IDEA加入`log4j.properties`文件**

`File->Project Structure`

![idea\_setting\_1][idea_setting_1]

将`log4j.properties`文件放入`resources`文件夹中  
![idea\_setting\_2][idea_setting_2]  
idea\_setting\_2

**步骤三：配置`log4j.properties`文件**

*  输出到控制台
 *  输出到../logs/task\_node.log文件（每天生成一个新文件，旧文件自动被重命名为`task_node.log_xxxx-xx-xx`）

log4j.rootLogger=DEBUG,console,FILE
    log4j.appender.console=org.apache.log4j.ConsoleAppender
    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] - %c -%F(%L) -%m%n 
    #log4j.appender.FILE=org.apache.log4j.RollingFileAppender
    #log4j.appender.FILE.Append=true 
    #log4j.appender.FILE.File=../logs/TaskNode.log 
    #log4j.appender.FILE.Threshold=INFO
    #log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
    #log4j.appender.FILE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%5p] - %c -%F(%L) -%m%n
    #log4j.appender.FILE.MaxFileSize=10MB 
    # Direct log messages to a log file 
    # Define the file appender log4j.appender.FILE=org.apache.log4j.DailyRollingFileAppender 
    # Set the name of the file log4j.appender.FILE.File=../logs/task_node.log 
    # Set the immediate flush to true (default) log4j.appender.FILE.ImmediateFlush=true 
    # Set the threshold to debug mode log4j.appender.FILE.Threshold=INFO 
    # Set the append to false, should not overwrite log4j.appender.FILE.Append=true 
    # Set the DatePattern log4j.appender.FILE.DatePattern='_'yyyy-MM-dd 
    # Define the layout for file appender
    log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
    log4j.appender.FILE.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%5p] - %c -%F(%L) -%m%n

**Usage**

private static final Logger logger = Logger.getLogger(GitUtil.class);
    
    logger.info("xxx");

[https_blog.csdn.net_yeweiouyang_article_details_53645458]: https://blog.csdn.net/yeweiouyang/article/details/53645458
[https_mvnrepository.com_artifact_log4j_log4j_1.2.16]: https://mvnrepository.com/artifact/log4j/log4j/1.2.16
[idea_setting_1]: https://img-my.csdn.net/uploads/201612/14/1481717259_8916.png
[idea_setting_2]: https://img-my.csdn.net/uploads/201612/14/1481717259_7709.png