log4j的xml配备方式

log4j的xml配置方式
一，原来一贯用的properties配置文件
log4j.properties

log4j.rootLogger = WARN, stdout#, file, html#----------------------------# Consolelog4j.appender.stdout = org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout = org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n#----------------------------# File#log4j.appender.file = org.apache.log4j.FileAppender#log4j.appender.file.File = d:/mylog.log#log4j.appender.file.layout = org.apache.log4j.PatternLayout#log4j.appender.file.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n#----------------------------# HTML#log4j.appender.html = org.apache.log4j.FileAppender#log4j.appender.html.File = d:/mylog.html#log4j.appender.html.layout = org.apache.log4j.HTMLLayout#----------------------------# Package !!!#log4j.logger.com.ying.dang.actions=DEBUG

二，今天在东洋人的要求下开始使用xml方式的配置文件
log4j.xml 比较典型

<?xml version="1.0" encoding="UTF-8"?>    <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"><appender name="stdout" value="%d{ABSOLUTE} %5p %c{1}:%L - %m%n" /></layout></appender><appender name="file" value="D:/test.log" /><param name="Append" value="true" /><layout value="%d{ABSOLUTE} %5p %c{1}:%L - %m%n" /></layout></appender><appender name="html" value="true" /><param name="File" value="D:/test.html" /><layout /></appender><appender name="daily" value="log/daily.log" /><param name="DatePattern" value="'daily.'yyyy-MM-dd'.log'" /><param name="Append" value="true" /><layout value="%d{ABSOLUTE} %5p %c{1}:%L - %m%n" />     </layout></appender><category name="cn.com.legendapl.spring.log" additivity="false">  <level value="DEBUG" /><appender-ref ref="stdout" /></category><root><level value="ERROR" /><appender-ref ref="stdout" /><appender-ref ref="file" /><appender-ref ref="html" /></root></log4j:configuration>

三，log4j的xml配置文件的树状结构如下所示，注意下图只显示了常用的部分。

xml declaration and dtd
            |
          log4j:configuration
            |
            +-- appender (name, class)
            |     |
            |     +-- param (name, value)
            |     +-- layout (class)
            |           |
            |           +-- param (name, value)
            +-- logger (name, additivity)
            |     |
            |     +-- level (class, value)
            |     |     |
            |     |     +-- param (name, value)
            |     +-- appender-ref (ref)
            +-- root
                  |
                  +-- param (name, class)
                  +-- level
                  |     |
                  |     +-- param (name, value)
                  +-- appender-ref (ref)

四，日志格式的含义
%m 输出代码中指定的消息 %p 输出优先级,即DEBUG,INFO,WARN,ERROR,FATAL  %r 输出自应用启动到输出该log信息耗费的毫秒数  %c 输出所属的类目,通常就是所在类的全名%t 输出产生该日志事件的线程名%n 输出一个回车换行符,Windows平台为"\r\n",Unix平台为"\n"%d 输出日志时间点的日期或时间,默认格式为ISO8601,也可以在其后指定格式

五，Log4j的初始化

public class Log4jInit extends HttpServlet {     public void init() {          String prefix = getServletContext().getRealPath("/");          String file = getInitParameter("Log4j-init-file");          if(file != null) {             PropertyConfigurator.configure(prefix+file);          }      }}

web.xml中配置一下

<servlet>  <servlet-name>Log4j-init</servlet-name>  <servlet-class>xx.xx.Log4jInit</servlet-class>  <init-param>    <param-name>Log4j-init-file</param-name>    <param-value>WEB-INF/classes/Log4j.properties</param-value>  </init-param>  <load-on-startup>1</load-on-startup></servlet>

1 楼 wait8712 2012-05-23   配置的太多了，还是properties配置文件比较好用，只是你的功能太少了，呵呵 2 楼 yingzhor 2012-05-23   我还写过这样一篇博客啊。 我自己都不记得了。

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