<!-- Tomcat使用 -->
<!-- <context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>
classpath:config/log4j.xml
</param-value>
</context-param>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:config/applicationContext.xml
</param-value>
</context-param> -->
<!-- JBoss使用 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:config/log4j.xml
classpath:config/applicationContext.xml
</param-value>
</context-param> 主要分为两个部分，分别在Tomcat和JBoss下使用，但需要注意使用contextConfigLocation时，不支持log4j的properties配置文件，只可以使用xml。<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/doc-files/log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<!-- 控制台配置 -->
<appender name="console" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
</layout>
</appender>
<!-- 文件配置 -->
<!-- <appender name="file" class="org.apache.log4j.RollingFileAppender">
<param name="append" value="false" />
<param name="maxFileSize" value="10MB" />
<param name="maxBackupIndex" value="10" />
<param name="file" value="${catalina.home}/logs/pro.log" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
</layout>
</appender> -->
<root>
<level value="WARN" />
<appender-ref ref="console" />
<!-- <appender-ref ref="file" /> -->
</root>
</log4j:configuration> 其中需要注意下，使用网上经常能搜到的<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">是会报错的。原文地址：http://blog.csdn.net/tylanbin/article/details/39995841
