12.log4j.properties例子:log4j.appender.file.Append

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package com.v512.log4j;import org.apache.log4j.Logger;public class HelloLog4J {// 构造记录器,形参是记录器所在的类,表示要在该类做日志private static Logger logger = Logger.getLogger(HelloLog4J.class);/**  * @param args */public static void main(String[] args) {getMessage();}private static void getMessage() {// 记录下各种级别的信息,这些信息放在哪儿,以哪种方式存放,在log4j.properties文件中配置.logger.debug("This is debug message.");logger.info("This is a info message.");logger.warn("This is a warn message.");logger.error("This is a error message.............");}}

log4j.rootLogger=info,filelog4j.appender.file=org.apache.log4j.FileAppenderlog4j.appender.file.File=Message.loglog4j.appender.file.Append=falselog4j.appender.file.layout=org.apache.log4j.PatternLayoutlog4j.appender.file.layout.ConversionPattern=%d{yyyyMMdd HH:mm:ss} %p %l [%t] %m%n

Message.log(工程目录下)20120730 11:21:13 INFO com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:18) [main] This is a info message.20120730 11:21:13 WARN com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:19) [main] This is a warn message.20120730 11:21:13 ERROR com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:20) [main] This is a error message.............总结:,log4j.appender.file.Append=false,不追加写到文件,最后输出的信息总是覆盖掉前面输出的信息