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  • log4j基础配置使用

    添加log4j的jar包:可以从maven处下载:https://mvnrepository.com/artifact/log4j/log4j/1.2.17

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>

    在src目录下创建:log4j.properties:

    # priority  :debug<info<warn<error
    #you cannot specify every priority with different file for log4j
    log4j.rootLogger=debug,stdout,info,debug,warn,error 
    
    #console
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender 
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 
    log4j.appender.stdout.layout.ConversionPattern= [%d{yyyy-MM-dd HH:mm:ss a}]:%p %l%m%n
    #info log
    log4j.logger.info=info
    log4j.appender.info=org.apache.log4j.DailyRollingFileAppender 
    log4j.appender.info.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.info.File=./src/com/autohome/log/info.log
    log4j.appender.info.Append=true
    log4j.appender.info.Threshold=INFO
    log4j.appender.info.layout=org.apache.log4j.PatternLayout 
    log4j.appender.info.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    #debug log
    log4j.logger.debug=debug
    log4j.appender.debug=org.apache.log4j.DailyRollingFileAppender 
    log4j.appender.debug.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.debug.File=./src/com/autohome/log/debug.log
    log4j.appender.debug.Append=true
    log4j.appender.debug.Threshold=DEBUG
    log4j.appender.debug.layout=org.apache.log4j.PatternLayout 
    log4j.appender.debug.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    #warn log
    log4j.logger.warn=warn
    log4j.appender.warn=org.apache.log4j.DailyRollingFileAppender 
    log4j.appender.warn.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.warn.File=./src/com/autohome/log/warn.log
    log4j.appender.warn.Append=true
    log4j.appender.warn.Threshold=WARN
    log4j.appender.warn.layout=org.apache.log4j.PatternLayout 
    log4j.appender.warn.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    #error
    log4j.logger.error=error
    log4j.appender.error = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.error.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.error.File = ./src/com/autohome/log/error.log 
    log4j.appender.error.Append = true
    log4j.appender.error.Threshold = ERROR 
    log4j.appender.error.layout = org.apache.log4j.PatternLayout
    log4j.appender.error.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n

    创建测试类:

    package com.autohome.test;
    import org.apache.log4j.Logger;
    public class LogTest {
        private static Logger log=Logger.getLogger(LogTest.class);
        public static void main(String[] args){
            log.info("this is info message");
            log.debug("this is debug message");
            log.warn("this is warn message");
            log.error("this is error message");
        }
    }
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  • 原文地址:https://www.cnblogs.com/linkmust/p/10943830.html
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