如何写日志

web配置要增加

  <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/classes/log4j.properties</param-value>
    </context-param>

    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.util.Log4jConfigListener
        </listener-class>
    </listener>

单机测试的是否不需要加listener

再将log4j.properties文件放入classes文件目录下

一个自己写的例子，将log写入mylog文件夹下

输出目录可以自动生成。。

log4j.properties

#### Use one appender to log to console

log4j.rootCategory=DEBUG, stdout,R

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

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

log4j.appender.stdout.layout.ConversionPattern=%5p (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender

log4j.appender.R.file=../MyLogs/log.txt

log4j.appender.R.DatePattern='.'yyyy-MM-dd-HH

log4j.appender.R.file.Append=true

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

log4j.appender.R.layout.ConversionPattern=%d %-5p [%c] %m%n

使用时候

private static Logger log = Logger.getLogger(MemberServlet.class.getName());

log.debug(xxxxxx);

log.info(xxx);

具体使用见网页http://www.builder.com.cn/2008/0517/866964.shtml