基于配置文件的方式来配置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     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 6         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
 7   
 8   <!-- 配置Bean -->
 9   <bean id="arithmeticCalculator"
10         class="com.hk.spring.aop.xml.ArithmeticCalculatorImpl">
11   </bean>
12   
13   <!-- 配置切面的Bean -->
14   <bean id="loggingAspect"
15         class="com.hk.spring.aop.xml.LoggingAspect">
16   </bean>
17   
18   <bean id="vlidationAspect"
19          class="com.hk.spring.aop.xml.VlidationAspect">
20   </bean>
21   
22   <!-- 配置AOP -->
23   <aop:config>
24      <!-- 配置切点表达式 -->
25      <aop:pointcut expression="execution(* com.hk.spring.aop.xml.ArithmeticCalculator.*(int,int))" 
26                    id="pointcut"/>
27      <!-- 配置切面和通知 -->
28      <aop:aspect ref="loggingAspect" order="2" >
29         <aop:before method="beforeMethod" pointcut-ref="pointcut"/>
30         <aop:after method="afterMethod" pointcut-ref="pointcut"/>
31         <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="ex"/>
32         <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result" />
33      </aop:aspect>
34      <aop:aspect ref="vlidationAspect" order="1">
35         <aop:before method="validateArgs" pointcut-ref="pointcut"/>
36      </aop:aspect>
37   </aop:config>
38 </beans>

 1 package com.hk.spring.aop.xml;
 2 
 3 import java.util.Arrays;
 4 
 5 import org.aopalliance.intercept.Joinpoint;
 6 import org.aspectj.lang.JoinPoint;
 7 import org.aspectj.lang.annotation.Aspect;
 8 import org.aspectj.lang.annotation.Before;
 9 import org.springframework.core.annotation.Order;
10 import org.springframework.stereotype.Component;
11 
12 
13 public class VlidationAspect {
14     
15     public void validateArgs(JoinPoint joinPoint){
16         System.out.println("-->validate:" + Arrays.asList(joinPoint.getArgs()));
17     }
18 
19 }

 1 package com.hk.spring.aop.xml;
 2 
 3 import java.util.Arrays;
 4 import java.util.List;
 5 
 6 import org.aopalliance.intercept.Joinpoint;
 7 import org.aspectj.lang.JoinPoint;
 8 import org.aspectj.lang.ProceedingJoinPoint;
 9 import org.aspectj.lang.annotation.After;
10 import org.aspectj.lang.annotation.AfterReturning;
11 import org.aspectj.lang.annotation.AfterThrowing;
12 import org.aspectj.lang.annotation.Around;
13 import org.aspectj.lang.annotation.Aspect;
14 import org.aspectj.lang.annotation.Before;
15 import org.aspectj.lang.annotation.Pointcut;
16 import org.springframework.core.annotation.Order;
17 import org.springframework.stereotype.Component;
18 
19 
20 public class LoggingAspect {
21     
22     /*
23      * 定义一个方法，用于声明切入点表达式，一般该方法中再不需要加入其它代码
24      */
25     public void declareJointPointExpression(){
26         
27     }
28     
29     
30     //声明该方法是一个前置通知：在目标方法之前执行
31     public void beforeMethod(JoinPoint joinPoint){
32         String methodName = joinPoint.getSignature().getName();
33         List<Object> args = Arrays.asList(joinPoint.getArgs());
34         System.out.println("The method " + methodName + " begins with " + args);
35     }
36     
37     //后置通知：在目标方法执行后（无论是否发生异常)，执行的通知。
38     public void afterMethod(JoinPoint joinPoint){
39         String methodName = joinPoint.getSignature().getName();
40         System.out.println("The method " + methodName + " ends");
41     }    
42     
43     
44     /*
45      * 在方法正常执行后执行的通知叫返回通知
46      * 返回通知是可以访问到方法的返回值的
47      */
48     public void afterReturning(JoinPoint joinPoint,Object result){
49         String methodName = joinPoint.getSignature().getName();
50         System.out.println("The method " + methodName + " ends with " + result);
51     }
52     
53     /*
54      * 在目标方法出现异常时，会执行代码。
55      * 可以访问到异常对象；且可以指定在出现特定异常时在执行通知
56      */
57     public void afterThrowing(JoinPoint joinPoint,Exception ex){
58         String methodName = joinPoint.getSignature().getName();
59         System.out.println("The method " + methodName + " coours exception : " + ex);
60     }
61     
62     /*
63      * 环绕通知需要携带ProceedingJoinPoint 类型的参数
64      * 环绕通知类似于动态代理的全过程：ProceedingJoinPoint这个类型的参数可以决定是否执行目标方法
65      * 且环绕通知必须有返回值，返回值即为目标方法的返回值
66      */
67     public Object aroundMethod(ProceedingJoinPoint pjd){
68         
69         Object result = null;
70         String methodName = pjd.getSignature().getName();
71         
72         //执行目标方法
73         try {
74             //前置通知
75             System.out.println("The method " + methodName + "begins with " + Arrays.asList(pjd.getArgs()));
76             result = pjd.proceed();
77             //后置通知
78             System.out.println("The method " + methodName + "ends with " + result);
79         } catch (Throwable e) {
80             //异常通知
81             System.out.println("The method occurs exception:" + e);
82         }
83         //后置通知
84         System.out.println("The method " + methodName + " ends");
85         return result;
86     }
87 }

1 package com.hk.spring.aop.xml;
2 
3 public interface ArithmeticCalculator {
4     int add(int i,int j);
5     int sub(int i,int j);
6     int mul(int i,int j);
7     int div(int i,int j);
8 }

 1 package com.hk.spring.aop.xml;
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 
 6 public class ArithmeticCalculatorImpl implements ArithmeticCalculator {
 7 
 8     @Override
 9     public int add(int i, int j) {
10         int result = i + j;
11         return result;
12     }
13 
14     @Override
15     public int sub(int i, int j) {
16         int result = i - j;
17         return result;
18     }
19 
20     @Override
21     public int mul(int i, int j) {
22         int result = i * j;
23         return result;
24     }
25 
26     @Override
27     public int div(int i, int j) {
28         int result = i / j;
29         return result;
30     }
31 
32 }