log4j 输入日志文件入门

朱雀 2022-09-29 06:32 120阅读 0赞

先对log4j的properties文件进行解释

### \u8BBE\u7F6E###
    log4j.rootLogger = debug,console,D,E
    
    ### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
    log4j.appender.console = org.apache.log4j.ConsoleAppender
    log4j.appender.console.Target = System.out
    log4j.appender.console.layout = org.apache.log4j.PatternLayout
    log4j.appender.console.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
    
    ### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
    log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.D.File = ./logs/dataUpdate.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
    
    ### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
    log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.E.File =./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

log4j.rootLogger = debug,console,D,E  
debug：代表了输出日志级别。  
console：控制对控制台的输出  
![这里写图片描述][SouthEast]

标注的地方只要单词一致，就可以。  
D，E同样的道理

java代码

private static Logger logger = Logger.getLogger(DataMain.class);
    private static void loadLogConfig() {   
            org.apache.log4j.PropertyConfigurator.configure("./conf/log4j.properties");
        }

加载日志文件

[SouthEast]: /images/20220708/a4969a24675643e0a50ada607c24d43b.png