aop注解 自定义切面的注解写法

spring.xml中

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4     xmlns:context="http://www.springframework.org/schema/context" 5     xmlns:aop="http://www.springframework.org/schema/aop" 6     xmlns:tx="http://www.springframework.org/schema/tx" 7     xsi:schemaLocation="http://www.springframework.org/schema/beans  8                          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 9                          http://www.springframework.org/schema/context10                          http://www.springframework.org/schema/context/spring-context-3.0.xsd11                          http://www.springframework.org/schema/tx12                          http://www.springframework.org/schema/tx/spring-tx-3.0.xsd13                          http://www.springframework.org/schema/aop 14                          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">15 <!--      扫描注解bean -->16      <context:component-scan base-package="cn.us.aspect"/>17 <!--      开启切面代理 使得spring认识 @Aspect -->18      <aop:aspectj-autoproxy/>

 

 java文件中   无参数的

 1 package cn.us.aspect; 2  3  4 import org.aspectj.lang.annotation.AfterReturning; 5 import org.aspectj.lang.annotation.Aspect; 6 import org.aspectj.lang.annotation.Before; 7 import org.aspectj.lang.annotation.Pointcut; 8 import org.springframework.stereotype.Component; 9 10 import cn.us.domain.User;11 12 @Component("logAspect")13 @Aspect14 public class LogAspect {15     // @Pointcut("execution(* cn.us.service.impl.UserServiceImpl.addUser(cn.us.domain.User)) and args(user)")   以下是无参数的写法16      @Pointcut("execution(* cn.us.service.impl.UserServiceImpl.*(..))")17      public void pointcut()18      {}19     // @Before("pointcut(user)")20       @Before("pointcut()")21     // public void startRecordLog(User user)22        public void startRecordLog()23      {24          System.out.println("Before log  has started");25          System.out.println();26      }27 28      @AfterReturning(value="pointcut()",returning="val")29      public void endRecordLog(Object val)30      {31          System.out.println("@AfterReturning log  has end");32          System.out.println(val);33      }34 }

 

有参数的 利用 @Before和@After写法

有参数 传递的写法 @Before和 @After 的形参都要写上 参数

 1 package cn.us.aspect; 2  3  4 import org.aspectj.lang.ProceedingJoinPoint; 5 import org.aspectj.lang.annotation.AfterReturning; 6 import org.aspectj.lang.annotation.Around; 7 import org.aspectj.lang.annotation.Aspect; 8 import org.aspectj.lang.annotation.Before; 9 import org.aspectj.lang.annotation.Pointcut;10 import org.springframework.stereotype.Component;11 12 import cn.us.domain.User;13 14 @Component("logAspect")15 @Aspect16 public class LogAspect {17     // @Pointcut("execution(* cn.us.service.impl.UserServiceImpl.*(cn.us.domain.User)) and args(user)")18     @Pointcut(value="execution(* cn.us.service.impl.UserServiceImpl.addUser(cn.us.domain.User)) && args(user) ")19      public void pointcut(User user)20      {}21     //     @Before(value="pointcut(user)")22     //     public void startRecordLog(cn.us.domain.User user)23      // @Before("pointcut()")24      // public void startRecordLog()25      @Before(value="pointcut(user)")26      public void startRecordLog(User user)27      {28          System.out.println("Before log  has started");29          System.out.println(user);30      }31 32      @AfterReturning(value="pointcut(user)",returning="val")33      public void endRecordLog(User user,Object val)34      {35          User u=(User) val;                          //这里要强制类型转换，否则输出的位null ,没有强转调用object的，所以就为null了36          System.out.println("@AfterReturning log  has end");37          System.out.println(u);38      }39      40      @Around(value = "pointcut(user)")41      public void aroundRecordLog(ProceedingJoinPoint pjp,User user) throws Throwable42      {43          System.out.println("around before");44          //获取参数45          Object [] objs=pjp.getArgs();46          for(Object obj :objs)47          {48              System.out.println(obj);49          }50          //返回值51          Object oo=pjp.proceed();52         53          System.out.println("around after"  +oo);54      }55 }

 

 无参数的写法，利用环绕通知

可以再环绕通知里 利用getArgs（）方法获取参数。并且输出

 1 package cn.us.aspect; 2  3  4 import org.aspectj.lang.ProceedingJoinPoint; 5 import org.aspectj.lang.annotation.AfterReturning; 6 import org.aspectj.lang.annotation.Around; 7 import org.aspectj.lang.annotation.Aspect; 8 import org.aspectj.lang.annotation.Before; 9 import org.aspectj.lang.annotation.Pointcut;10 import org.springframework.stereotype.Component;11 12 import cn.us.domain.User;13 14 @Component("logAspect")15 @Aspect16 public class LogAspect {17     // @Pointcut("execution(* cn.us.service.impl.UserServiceImpl.*(cn.us.domain.User)) and args(user)")18      @Pointcut(value="execution(* cn.us.service.impl.UserServiceImpl.addUser(..)) ")19      public void pointcut()20      {}21 22      @Around(value = "pointcut()")23      public void aroundRecordLog(ProceedingJoinPoint pjp) throws Throwable24      {25          System.out.println("around before");26          //获取参数27          Object [] objs=pjp.getArgs();28          for(Object obj :objs)29          {30              System.out.println(obj);31          }32          //返回值33          Object oo=pjp.proceed();34         35          System.out.println("around after"  +oo);36      }37 }