log4j Test

package test;



import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;



public class Log4jTest {

    private static Log logger = LogFactory.getLog(Log4jTest.class); 

    public static void main(String[] args) {

        logger.error("ERROR");

        logger.debug("DEBUG");

        logger.warn("WARN");

        logger.info("INFO");

        logger.trace("TRACE");

        System.out.println(logger.getClass());

    }



}

1 将commons-logging-1.0.4.jar，log4j.jar放入新建文件夹lib下，然后选中二者，build path 后，classpath发生了改变

<?xml version="1.0" encoding="UTF-8"?>

<classpath>

    <classpathentry kind="src" path="src"/>

    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>

    <classpathentry kind="lib" path="lib/commons-logging-1.0.4.jar"/>

    <classpathentry kind="lib" path="lib/log4j.jar"/>

    <classpathentry kind="output" path="bin"/>

</classpath>

2 添加 \bin\log4j.properties

# log4j configuration used during build and unit tests



log4j.rootLogger=info,stdout,R

log4j.threshhold=ALL

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} (%F:%M(%L)) - %m%n



log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.File=test.txt

log4j.appender.R.MaxFileSize=100KB

log4j.appender.R.MaxBackupIndex=0

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} (%F:%M(%L)) - %m%n

运行，日志文件位置：log4jtest\test.txt