spring mvc 异常处理Log4j配置

1.肯定是要导入相应的log4j包：log4j.x.jar包；

2.在web.xml写入上下文：

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>

3.配置log4j.properties属性文件：

# FATAL, ERROR, WARN, INFO, DEBUG
log4j.rootLogger=WARN,stdout,D

#stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern= %d{ABSOLUTE} %5p %c{1}:%L - %m%n

#logFile
### save error to another file ###
log4j.appender.D=org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File=../logs/sw_error.log
log4j.appender.D.Append=true
#error only in this file
log4j.appender.D.Threshold =WARN
log4j.appender.D.layout=org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%t:%r] - [%p]  %m%n

4.全局异常处理配置，在spring-mvc.xml中配置：

<bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<prop key="java.lang.Exception">errors/error</prop>
<prop key="java.lang.Throwable">errors/err</prop>
</props>
</property>
<property name="statusCodes">
<props>
<prop key="errors/error">500</prop>
<prop key="errors/404">404</prop>
</props>
</property>
<!-- 设置日志输出级别，不定义则默认不输出警告等错误日志信息 -->
<property name="warnLogCategory" value="WARN"></property>
<!-- 默认错误页面，当找不到上面mappings中指定的异常对应视图时，使用本默认配置 -->
<!-- <property name="defaultErrorView" value="errors/error"></property>  -->
<!-- 默认HTTP状态码 -->
<property name="defaultStatusCode" value="500"></property>
</bean>

5、现在可以测试了：

private final Log logger = LogFactory.getLog(SimplerController.class);

logger.warn(" logger");
logger.error("~~info~~");

想了解log4j.properties配置详情：http://blog.csdn.net/snakeqi/article/details/5183070