最近项目中用到AOP方式进行Service操作方法日志管理，特为之记！
1、先说理论和采用的方法
采用注解的方式，其中包括以下注解：@Aspect（类注解）和@AfterReturning（方法注解），其中需要用的Maven库如下：
"org.aspectj:aspectjrt:1.8.9","org.aspectj:aspectjweaver:1.8.9",
org.springframework spring-aop 4.0.5.RELEASE其中该两个注解的主要用法为：
@Aspect：Spring AOP支持的AspectJ切入点指示符
@AfterReturning：使用@AfterReturning可修饰AfterReturning增强处理，AfterReturning增强处理将在目标方法正常完成后被织入。 使用@AfterReturning注解可指定如下两个常用属性。 1) pointcut/value:这两个属性的作用是一样的，它们都属于指定切入点对应的切入表达式。一样既可以是已有的切入点，也可直接定义切入点表达式。当指定了pointcut属性值后，value属性值将会被覆盖。 2) returning:该属性指定一个形参名，用于表示Advice方法中可定义与此同名的形参，该形参可用于访问目标方法的返回值。除此之外，在Advice方法中定义该形参（代表目标方法的返回值）时指定的类型，会限制目标方法必须返回指定类型的值或没有返回值。
2、样例：
2.1 在spring-app-config.xml中声明启动aop
<!--配置aop自动创建代理--> <aop:aspectj-autoproxy proxy-target-class="true"/> <bean id="customerAspectLogger" class="com.XXX.dsppt.aop.CustomerAspectLogger"></bean> <bean id="systemAspectLogger" class="com.VVVV.dsppt.aop.SystemAspectLogger"></bean> 2.2 编写日志切面类 package com.XXX.dsppt.aop; import com.XXX.dsppt.entity.SystemLog; import com.XXX.dsppt.entity.User; import com.XXX.dsppt.entity.meta.SystemOperateType; import com.XXX.dsppt.security.SecurityConstants; import com.XXX.dsppt.service.ILogService; import org.apache.log4j.Logger; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.Aspect; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import java.util.Date; /** * Created by nongdapeng on 17/5/4. */ @Aspect public class SystemAspectLogger { private static final Logger logger = Logger.getLogger(SystemAspectLogger.class); @Resource private ILogService logService; /** * 创建日志 * @param point * @throws Throwable */ @AfterReturning(value = "execution (* com.XXX.dsppt.service.*.add*(..))", returning = "returnObj") public void endAddTransaction(JoinPoint point, Object returnObj) throws Throwable { //获取方法名 String methodName = point.getSignature().getName(); User user = getUser(); HttpServletRequest request = getRequest(); if (user != null) { SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.ADD); logService.createSystemLog(systemLog); } } /** * 更新日志 * @param point * @throws Throwable */ @AfterReturning(value = "execution (* com.XXX.dsppt.service.*.update*(..))", returning = "returnObj") public void endUpdateTransaction(JoinPoint point, Object returnObj) throws Throwable { //获取方法名 String methodName = point.getSignature().getName(); User user = getUser(); HttpServletRequest request = getRequest(); if (user != null) { SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.UPDATE); logService.createSystemLog(systemLog); } } /** * 删除日志 * @param point * @throws Throwable */ @AfterReturning(value = "execution (* com.XXX.dsppt.service.*.remove*(..))", returning = "returnObj") public void endRemoveTransaction(JoinPoint point, Object returnObj) throws Throwable { //获取方法名 String methodName = point.getSignature().getName(); User user = getUser(); HttpServletRequest request = getRequest(); if (user != null) { SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.REMOVE); logService.createSystemLog(systemLog); } } /** * 导出日志 * @param point * @throws Throwable */ @AfterReturning(value = "execution (* com.XXX.dsppt.service.*.export*(..))", returning = "returnObj") public void endExportTransaction(JoinPoint point, Object returnObj) throws Throwable { //获取方法名 String methodName = point.getSignature().getName(); User user = getUser(); HttpServletRequest request = getRequest(); if (user != null) { SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.EXPORT); logService.createSystemLog(systemLog); } } private User getUser() { User user = null; try { ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes(); HttpSession session = attr.getRequest().getSession(true); user = (User) session.getAttribute(SecurityConstants.LOGIN_SESSION); } catch (Exception ignored) { ignored.printStackTrace(); logger.error("获取当前登陆用户时发生错误：" + ignored.getMessage()); } return user; } private HttpServletRequest getRequest() { HttpServletRequest request = null; try { ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes(); request = attr.getRequest(); } catch (Exception ignored) { ignored.printStackTrace(); logger.error("获取当前用户ip错误：" + ignored.getMessage()); } return request; } } 其中，一些相关概念： Aspect - 切面 Pointcut - 切入点 Joinpoint - 连接点 Pointcut Designators (PCD) Spring AOP中, 切入点(Pointcut)注释符在使用execution方法时以下的连接点(joinpoint)是可用的。 • execution • within • this • target • args • @target • @args • @within • @annotation • bean 以下的切入点(pointcut)仅支持基于XML的Spring AOP配置，不支持AspectJ注释形式。如使用将会导致IllegalArgumentException异常。他们是: • call • get • set • preinitialization • staticinitialization • initialization • handler • adviceexecution • withincode • cflow • cflowbelow • if • @this• @withincode
