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1.下载

http://logging.apache.org/log4j/1.2/

2.工程

3.详解

1）代码中使用

package com.wicresoft.demo;import java.util.Properties;import org.apache.log4j.Logger;import org.apache.log4j.PropertyConfigurator;public class Hello {	Logger logger = Logger.getLogger(Hello.class);		public Hello(){		logger.warn("Hello constructed.");		logger.warn("Hello constructed.");	}		/**	 * @param args	 */	public static void main(String[] args) {		// TODO Auto-generated method stub		PropertyConfigurator.configure("log4j.properties");		//initLog4j();		Hello hello = new Hello();	}		/*	 * Initialize configuration of log4j	 * you do not need file log4j.properties	 * */	private static void initLog4j() {		Properties prop = new Properties();		prop.setProperty("log4j.rootLogger", "DEBUG, CONSOLE");		prop.setProperty("log4j.appender.CONSOLE", "org.apache.log4j.ConsoleAppender");		prop.setProperty("log4j.appender.CONSOLE.layout", "org.apache.log4j.PatternLayout");		prop.setProperty("log4j.appender.CONSOLE.layout.ConversionPattern", "%d{HH:mm:ss,SSS} [%t] %-5p %C{1} : %m%n");		PropertyConfigurator.configure(prop);	}}

log4j.rootLogger=info, ServerDailyRollingFile, stdout log4j.appender.ServerDailyRollingFile=org.apache.log4j.DailyRollingFileAppender log4j.appender.ServerDailyRollingFile.DatePattern='.'yyyy-MM-dd log4j.appender.ServerDailyRollingFile.File=C\://logs/notify-subscription.log log4j.appender.ServerDailyRollingFile.layout=org.apache.log4j.PatternLayout log4j.appender.ServerDailyRollingFile.layout.ConversionPattern=%d - %m%n log4j.appender.ServerDailyRollingFile.Append=truelog4j.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} %p [%c] %m%n

5.问题解决

如果报文件找不到异常,则文件路径不对，bin目录应使用

PropertyConfigurator.configure("/bin/log4j.properties");