这个只是个简单AOP例子,包括前置通知，后置通知,环绕通知,和目标对象。写这个例子的主要目标只是想让想学AOP的能更快地入门，了解一下如何去配置AOP里面的东东。
目标对象的接口:IStudent.java
1 
/** */ /**
2 
*
3 
*/
4 
package com.dragon.study;
5
6 /** */ /**
7 * @author dragon
8 *
9 */
10 public interface IStudent 
{
11
12 public void addStudent(String name);
13 }
14
目标类:StudentImpl.java
1 /** */ /**
2 *
3 */
4 package com.dragon.study.Impl;
5
6 import com.dragon.study.IStudent;
7
8 /** */ /**
9 * @author dragon
10 *
11 */
12 public class StudentImpl implements IStudent {
13
14 
public void addStudent(String name) {
15 System.out.println( " 欢迎 " + name + " 你加入Spring家庭! " );
16 
}
17 }
18
前置通知:BeforeAdvice.java
1 /** */ /**
2 *
3 */
4 package com.dragon.Advice;
5
6 import java.lang.reflect.Method;
7
8 import org.springframework.aop.MethodBeforeAdvice;
9
10 /** */ /**
11 * @author dragon
12 *
13 */
14 public class BeforeAdvice implements MethodBeforeAdvice {
15
16 public void before(Method method,Object[] args, Object target)
17 throws Throwable {
18
19 System.out.println( " 这是BeforeAdvice类的before方法. " );
20
21 }
22 }
23
后置通知:AfterAdvice.java
1/** *//**
2 *
3 */
4package com.dragon.Advice;
5
6import java.lang.reflect.Method;
7
8import org.springframework.aop.AfterReturningAdvice;
9
10/** *//**
11 * @author dragon
12 *
13 */
14public class AfterAdvice implements AfterReturningAdvice{
15
16 public void afterReturning(Object returnValue ,Method method,
17 Object[] args,Object target) throws Throwable{
18 System.out.println("这是AfterAdvice类的afterReturning方法.");
19 }
20
21
22}
23
环绕通知:CompareInterceptor.java
1/** *//**
2 *
3 */
4package com.dragon.Advice;
5
6import org.aopalliance.intercept.MethodInterceptor;
7import org.aopalliance.intercept.MethodInvocation;
8
9
10/** *//**
11 * @author dragon
12 *
13 */
14public class CompareInterceptor implements MethodInterceptor{
15
16 public Object invoke(MethodInvocation invocation) throws Throwable{
17 Object result = null;
18 String stu_name = invocation.getArguments()[0].toString();
19 if ( stu_name.equals("dragon")){
20 //如果学生是dragon时,执行目标方法,
21 result= invocation.proceed();
22
23 } else{
24 System.out.println("此学生是"+stu_name+"而不是dragon,不批准其加入.");
25 }
26
27 return result;
28 }
29}
30
配置文件applicationContext.xml
1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
3
4<beans>
5
6<bean id="beforeAdvice" class="com.dragon.Advice.BeforeAdvice"></bean>
7<bean id="afterAdvice" class="com.dragon.Advice.AfterAdvice"></bean>
8<bean id="compareInterceptor" class="com.dragon.Advice.CompareInterceptor"></bean>
9<bean id="studenttarget" class="com.dragon.study.Impl.StudentImpl"></bean>
10
11<bean id="student" class="org.springframework.aop.framework.ProxyFactoryBean">
12 <property name="proxyInterfaces">
13 <value>com.dragon.study.IStudent</value>
14 </property>
15 <property name="interceptorNames">
16 <list>
17 <value>beforeAdvice</value>
18 <value>afterAdvice</value>
19 <value>compareInterceptor</value>
20 </list>
21 </property>
22 <property name="target">
23 <ref bean="studenttarget"/>
24 </property>
25
26</bean>
27
28
29
30
31</beans>
现在开始写测试类,Test.java
1/** *//**
2 *
3 */
4package com;
5
6import org.springframework.context.ApplicationContext;
7import org.springframework.context.support.FileSystemXmlApplicationContext;
8
9import com.dragon.study.IStudent;
10
11/** *//**
12 * @author dragon
13 *
14 */
15public class Test {
16
17 /** *//**
18 * @param args
19 */
20 public static void main(String[] args) {
21 // TODO Auto-generated method stub
22 ApplicationContext ctx =
23 new FileSystemXmlApplicationContext("/com/dragon/applicationContext.xml");
24
25 IStudent person = (IStudent)ctx.getBean("student");
26 person.addStudent("dragon");
27
28// person.addStudent("javadragon");
29 }
30
31}
32