A，首先说，如何配置：
1，在web.xml中添加代码：
<!-- log4j的配置相关 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:config/log4j/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>6000000</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.util.Log4jConfigListener
</listener-class>
</listener>
<!-- end -->
2，classpath:config/log4j/log4j.properties配置文件如下：
### set log levels ###
log4j.rootLogger = WARN , stdout , D , E
### \u8F93\u51FA\u5230\u63A7\u5236\u53F0 ###
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{yyyy-MM-dd HH:mm:ss} [ %p ] %m%n
### \u8F93\u51FA\u5230\u65E5\u5FD7\u6587\u4EF6 ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
#log4j.appender.D.File = D://WARN_log.log
log4j.appender.D.File = /mnt/soft/tomcat/common_logs/tomcat_6082_Warn_log.log
log4j.appender.D.Append = true
log4j.appender.D.Encoding=UTF-8
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} [ %p ] %m%n
### \u4FDD\u5B58\u5F02\u5E38\u4FE1\u606F\u5230\u5355\u72EC\u6587\u4EF6 ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
#log4j.appender.E.File = D://error_log.log
log4j.appender.E.File = /mnt/soft/tomcat/common_logs/tomcat_6082_Error_log.log
log4j.appender.E.Append = true
log4j.appender.E.Encoding=UTF-8
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern =%-d{yyyy-MM-dd HH:mm:ss} [ %p ] %m%n
具体的参数含义，参考：http://blog.csdn.net/azheng270/article/details/2173430/
B，其次，如何配合注解和Aop，实现 异常日志记录：
1，自定义注解：
@Documented
@Inherited
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ServiceExceptionLog {
String description() default "异常信息";
}
2，自定义一个切面类，并使用：
package com.sxb.web.common.aop;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import com.google.gson.Gson;
import com.sxb.web.common.interceptor.annotate.ServiceExceptionLog;
import java.lang.reflect.Method;
/**
* 切点类
* @author tiangai
* @since 2014-08-05 Pm 20:35
* @version 1.0
*/
@Aspect
@Component
public class ServiceExceptionLogAspect {
//本地异常日志记录对象
private static final Logger logger = Logger.getLogger(ServiceExceptionLogAspect.class.getName());
//Service层切点
@Pointcut("execution(* com.sxb.web.v2.wh.service.impl.*.*(..))")
public void serviceAspect() {
}
/**
* 异常通知 用于拦截service层记录异常日志
*
* @param joinPoint
* @param e
* @throws Exception
*/
@AfterThrowing(pointcut = "serviceAspect()", throwing = "e")
public void doAfterThrowing(JoinPoint joinPoint, Throwable e) throws Exception {
// HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
// HttpSession session = request.getSession();
//获取用户请求方法的参数并序列化为JSON格式字符串
String params = "";
if (joinPoint.getArgs() != null && joinPoint.getArgs().length > 0) {
for ( int i = 0; i < joinPoint.getArgs().length; i++) {
params += new Gson().toJson(joinPoint.getArgs()[i]) + ";";
}
}
StringBuilder bd = new StringBuilder();
bd.append("异常方法相关信息:"+getServiceMthodDescription(joinPoint)).append(" ### ").
append("异常代码:"+e.getClass().getName()).append(" ### ")
.append("异常信息:"+e.getMessage()).append(" ### ")
.append("参数:"+params);
logger.error(bd.toString());
}
/**
* 获取注解中对方法的描述信息 用于service层注解
*
* @param joinPoint 切点
* @return 方法描述
* @throws Exception
*/
public static String getServiceMthodDescription(JoinPoint joinPoint)
throws Exception {
String targetName = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
Object[] arguments = joinPoint.getArgs();
Class targetClass = Class.forName(targetName);
Method[] methods = targetClass.getMethods();
String description = "异常类是:"+targetName+" ;异常方法名称:"+methodName+" ;异常描述信息:";
for (Method method : methods) {
if (method.getName().equals(methodName)) {
Class[] clazzs = method.getParameterTypes();
if (clazzs.length == arguments.length) {
description += method.getAnnotation(ServiceExceptionLog.class).description();
break;
}
}
}
return description;
}
}
3，给一个Service方法添加异常日志记录注解：
@ServiceExceptionLog(description="--自定义异常描述---")
public void test(String str) {
int aa =12/0;
}