aop注解 自定义切面的注解写法
aop注解 自定义切面的注解写法
spring.xml中
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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/context
10 http://www.springframework.org/schema/context/spring-context-3.0.xsd
11 http://www.springframework.org/schema/tx
12 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
13 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 @Aspect
14 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 }
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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 @Aspect
16 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 Throwable
42 {
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 @Aspect
16 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 Throwable
24 {
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 }