Spring学习--用 ASpectJ 注解实现 AOP

 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:aop="http://www.springframework.org/schema/aop"
 5        xmlns:context="http://www.springframework.org/schema/context"
 6        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 7        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
 8        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 9 
10     <!-- IOC 扫描包 -->
11     <context:component-scan base-package="com.itdoc.spring.aop.impl"></context:component-scan>
12     <!-- 使 AspectJ 注解起作用, 自动为匹配的类生成代理对象 -->
13     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
14 
15 </beans>

 1 package com.itdoc.spring.aop.impl;
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 /**
 6  * http://www.cnblogs.com/goodcheap
 7  *
 8  * @author: Wáng Chéng Dá
 9  * @create: 2017-03-03 19:34
10  */
11 @Component
12 public interface Arithmetic {
13 
14     int add(int i, int j);
15 
16     int sub(int i, int j);
17 
18     int mul(int i, int j);
19 
20     int div(int i, int j);
21 
22 }

 1 package com.itdoc.spring.aop.impl;
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 /**
 6  * http://www.cnblogs.com/goodcheap
 7  *
 8  * @author: Wáng Chéng Dá
 9  * @create: 2017-03-03 19:35
10  */
11 @Component("arithmetic")
12 public class ArithmeticImpl implements Arithmetic {
13     @Override
14     public int add(int i, int j) {
15         int result = i + j;
16         return result;
17     }
18 
19     @Override
20     public int sub(int i, int j) {
21         int result = i - j;
22         return result;
23     }
24 
25     @Override
26     public int mul(int i, int j) {
27         int result = i * j;
28         return result;
29     }
30 
31     @Override
32     public int div(int i, int j) {
33         int result = i / j;
34         return result;
35     }
36 }

 1 package com.itdoc.spring.aop.impl;
 2 
 3 
 4 import org.aspectj.lang.JoinPoint;
 5 import org.aspectj.lang.annotation.Aspect;
 6 import org.aspectj.lang.annotation.Before;
 7 import org.springframework.stereotype.Component;
 8 
 9 import java.util.Arrays;
10 
11 /**
12  * http://www.cnblogs.com/goodcheap
13  * 声明为一个切面的类: 需要把该类放到 IOC 容器中, 再声明为一个切面。
14  * @author: Wáng Chéng Dá
15  * @create: 2017-03-03 21:37
16  */
17 @Aspect
18 @Component
19 public class LoggingAspect {
20 
21     //声明该方法为前置通知: 在目标方法执行之前开始执行。
22     @Before("execution(* com.itdoc.spring.aop.impl.*.*(..))")
23     public void beforeMethod(JoinPoint joinPoint) {
24         Object methodName = joinPoint.getSignature().getName();
25         Object args = Arrays.asList(joinPoint.getArgs());
26         System.out.println("The method " + methodName + " begins with " + args);
27     }
28 }

 1 package com.itdoc.spring.aop.impl;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 /**
 7  * http://www.cnblogs.com/goodcheap
 8  *
 9  * @author: Wáng Chéng Dá
10  * @create: 2017-03-03 21:32
11  */
12 public class Main {
13 
14     public static void main(String[] args) {
15 
16         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
17         Arithmetic arithmetic = (Arithmetic) ctx.getBean("arithmetic");
18         System.out.println("result = " + arithmetic.add(9, 5));
19         System.out.println("result = " + arithmetic.sub(9, 5));
20     }
21 }

 1 package com.itdoc.spring.aop.impl;
 2 
 3 
 4 import org.aspectj.lang.JoinPoint;
 5 import org.aspectj.lang.annotation.After;
 6 import org.aspectj.lang.annotation.Aspect;
 7 import org.aspectj.lang.annotation.Before;
 8 import org.springframework.stereotype.Component;
 9 
10 import java.util.Arrays;
11 
12 /**
13  * http://www.cnblogs.com/goodcheap
14  * 声明为一个切面的类: 需要把该类放到 IOC 容器中, 再声明为一个切面。
15  * @author: Wáng Chéng Dá
16  * @create: 2017-03-03 21:37
17  */
18 @Aspect
19 @Component
20 public class LoggingAspect {
21 
22     //声明该方法为前置通知: 在目标方法执行之前开始执行。
23     @Before("execution(* com.itdoc.spring.aop.impl.*.*(..))")
24     public void beforeMethod(JoinPoint joinPoint) {
25         Object methodName = joinPoint.getSignature().getName();
26         Object args = Arrays.asList(joinPoint.getArgs());
27         System.out.println("The method " + methodName + " begins with " + args);
28     }
29 
30     //声明该方法为后置通知: 在目标方法执行之后(无论是否发生异常)开始执行。
31     @After("execution(* com.itdoc.spring.aop.impl.*.*(..))")
32     public void afterMethod(JoinPoint joinPoint) {
33         Object methodName = joinPoint.getSignature().getName();
34         Object args = Arrays.asList(joinPoint.getArgs());
35         System.out.println("The method " + methodName + " ends with " + args);
36     }
37 }

 1 package com.itdoc.spring.aop.impl;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 /**
 7  * http://www.cnblogs.com/goodcheap
 8  *
 9  * @author: Wáng Chéng Dá
10  * @create: 2017-03-03 21:32
11  */
12 public class Main {
13 
14     public static void main(String[] args) {
15 
16         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
17         Arithmetic arithmetic = (Arithmetic) ctx.getBean("arithmetic");
18         System.out.println("result = " + arithmetic.add(9, 5));
19         System.out.println("result = " + arithmetic.div(9, 0));
20     }
21 }

 1 package com.itdoc.spring.aop.circular;
 2 
 3 import org.aspectj.lang.JoinPoint;
 4 import org.aspectj.lang.annotation.AfterReturning;
 5 import org.aspectj.lang.annotation.Aspect;
 6 import org.springframework.stereotype.Component;
 7 
 8 /**
 9  * 通知
10  * http://www.cnblogs.com/goodcheap
11  *
12  * @author: Wáng Chéng Dá
13  * @create: 2017-03-04 9:50
14  */
15 @Aspect
16 @Component
17 public class AsjectLogging {
18 
19     /**
20      * 在方法正常结束后执行代码。
21      * 返回通知是可以访问到方法的返回值的。
22      */
23     @AfterReturning(value = "execution(* com.itdoc.spring.aop.circular.*.*(..))", returning = "result")
24     public void afterReturning(JoinPoint joinPoint, Object result) {
25         Object methodName = joinPoint.getSignature().getName();
26         System.out.println("The method " + methodName + " ends with " + result);
27     }
28 }

 1 package com.itdoc.spring.aop.circular;
 2 
 3 import org.aspectj.lang.JoinPoint;
 4 import org.aspectj.lang.annotation.AfterReturning;
 5 import org.aspectj.lang.annotation.AfterThrowing;
 6 import org.aspectj.lang.annotation.Aspect;
 7 import org.springframework.stereotype.Component;
 8 
 9 /**
10  * 通知
11  * http://www.cnblogs.com/goodcheap
12  *
13  * @author: Wáng Chéng Dá
14  * @create: 2017-03-04 9:50
15  */
16 @Aspect
17 @Component
18 public class AsjectLogging {
19 
20     /**
21      * 在目标方法出现异常时候执行的代码。
22      * 可以访问到异常对象, 且可以指定在出现特定异常时再执行的代码。
23      */
24     @AfterThrowing(value = "execution(* com.itdoc.spring.aop.circular.*.*(..))", throwing = "e")
25     public void afterThrowing(JoinPoint joinPoint, Exception e) {
26         Object methodName = joinPoint.getSignature().getName();
27         System.out.println("The method " + methodName + " exception with " + e);
28     }
29 }

 1 package com.itdoc.spring.aop.circular;
 2 
 3 import org.aspectj.lang.ProceedingJoinPoint;
 4 import org.aspectj.lang.annotation.Around;
 5 import org.aspectj.lang.annotation.Aspect;
 6 import org.springframework.stereotype.Component;
 7 
 8 import java.util.Arrays;
 9 
10 /**
11  * 通知
12  * http://www.cnblogs.com/goodcheap
13  *
14  * @author: Wáng Chéng Dá
15  * @create: 2017-03-04 9:50
16  */
17 @Aspect
18 @Component
19 public class AsjectLogging {
20 
21     /**
22      * 环绕通知需携带 ProceedingJoinPoint 类型的参数。
23      * 环绕通知类似于动态代理的全过程: ProceedingJoinPoint 类型参数可以决定是否执行目标方法。
24      * 环绕通知必须有返回值, 返回值即目标方法的返回值。
25      *
26      * @param point
27      * @return
28      */
29     @Around("execution(* com.itdoc.spring.aop.circular.*.*(..))")
30     public Object around(ProceedingJoinPoint point) {
31         Object methodName = point.getSignature().getName();
32         Object[] args = point.getArgs();
33         Object result = null;
34         try {
35             //前置通知
36             System.out.println("The method " + methodName + " begins with" + Arrays.asList(args));
37             //执行方法
38             result = point.proceed();
39             //返回通知
40             System.out.println("The method " + methodName + " ends with " + result);
41         } catch (Throwable e) {
42             e.printStackTrace();
43             //异常通知
44             System.out.println("The method " + methodName + " exception with " + e);
45         } finally {
46             //后置通知
47             System.out.println("The method " + methodName + " ends");
48         }
49         return result;
50     }
51 }