<?xml version="1.0" encoding="GBK"?>

使用Spring自动生成代理类,spring利用的是动态代理机制
接口

Java代码
public interface UserDao {  
void addUser();  
void deleteUser();  
} 

public interface UserDao {
void addUser();
void deleteUser();
}
两个实现:

Java代码
public class UserDaoMySqlImpl implements UserDao {  
 
@Override 
public void addUser() {  
  System.out.println("UserDaoMySqlImpl.addUser()");  
}  
 
@Override 
public void deleteUser() {  
  System.out.println("UserDaoMySqlImpl.deleteUser()");  
 
}  
 
}  
public class UserDaoOracleImpl implements UserDao {  
 
@Override 
public void addUser() {  
  System.out.println("UserDaoOracleImpl.addUser()");  
}  
 
@Override 
public void deleteUser() {  
  System.out.println("UserDaoOracleImpl.deleteUser()");  
}  
 
}  
Device  
import java.lang.reflect.Method;  
 
import org.springframework.aop.AfterReturningAdvice;  
 
public class UserDaoBeforeAdvice implements AfterReturningAdvice {  
 
@Override 
public void afterReturning(Object arg0, Method arg1, Object[] arg2,  
   Object arg3) throws Throwable {  
  System.out.println("UserDaoBeforeAdvice.afterReturning()");  
}  
 
} 

public class UserDaoMySqlImpl implements UserDao {

@Override
public void addUser() {
  System.out.println("UserDaoMySqlImpl.addUser()");
}

@Override
public void deleteUser() {
  System.out.println("UserDaoMySqlImpl.deleteUser()");

}

}
public class UserDaoOracleImpl implements UserDao {

@Override
public void addUser() {
  System.out.println("UserDaoOracleImpl.addUser()");
}

@Override
public void deleteUser() {
  System.out.println("UserDaoOracleImpl.deleteUser()");
}

}
Device
import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class UserDaoBeforeAdvice implements AfterReturningAdvice {

@Override
public void afterReturning(Object arg0, Method arg1, Object[] arg2,
   Object arg3) throws Throwable {
  System.out.println("UserDaoBeforeAdvice.afterReturning()");
}

}

配置文件

Xml代码
<!-- 配置实现类的bean,可以把所有的实现类都写上 --> 
<bean id="userdao" class="com.dowebber.spring.aop_after.UserDaoMySqlImpl"></bean> 
<!--配置Advice的bean --> 
<bean id="beforeadvice" class="com.dowebber.spring.aop_after.UserDaoBeforeAdvice"></bean> 
<!--配置spring自动生成代理对象所需要的一些参数 --> 
<bean id="userdaoproxy" class="org.springframework.aop.framework.ProxyFactoryBean"> 
<property name="proxyInterfaces" value="com.dowebber.spring.aop_after.UserDao"/> 
<property name="target"> 
  <ref bean="userdao"/> 
</property> 
<property name="interceptorNames"> 
  <list> 
   <value>beforeadvice</value> 
  </list> 
</property> 
</bean> 

<!-- 配置实现类的bean,可以把所有的实现类都写上 -->
<bean id="userdao" class="com.dowebber.spring.aop_after.UserDaoMySqlImpl"></bean>
<!--配置Advice的bean -->
<bean id="beforeadvice" class="com.dowebber.spring.aop_after.UserDaoBeforeAdvice"></bean>
<!--配置spring自动生成代理对象所需要的一些参数 -->
<bean id="userdaoproxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="proxyInterfaces" value="com.dowebber.spring.aop_after.UserDao"/>
<property name="target">
  <ref bean="userdao"/>
</property>
<property name="interceptorNames">
  <list>
   <value>beforeadvice</value>
  </list>
</property>
</bean>
测试类

Java代码
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
 
public class TestUserDaoAfterDevice {  
 
public static void main(String[] args) {  
    
  ApplicationContext context = new ClassPathXmlApplicationContext("com/dowebber/spring/aop_after/spring.xml");  
  UserDao dao = (UserDao)context.getBean("userdaoproxy");  
  dao.addUser();  
}  
 
}