LogInterception.java
package com.bebig.aop;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect//需要加入Aspectj包文件才能使用，而Aspectj包又需要aopalliance包支持
@Component//此实现方法对象必须由Spring容器来初始化才能实现代理
public class LogInterception {
    // @Before("execution(public void com.bebig.dao.impl.UserDAOImpl.save(com.bebig.model.User))")
    // @Before("execution(public * com.bebig.dao.impl.UserDAOImpl.*(..))")
    // @Before("execution(* save(..))")
    // @Before("within(com.bebig.dao.impl..*)")//将此包及其子包内所有方法进行代理
    //其它注解请查Spring文档
    @Before("myMethod()")
    public void before() {
        System.out.println("Log start");
    }

    @Pointcut("within(com.bebig.service..*)")
    //代理没有实现接口的对象时，是由CGLib直接生成二进制文件的，因此需要cglib包文件与objectweb.asm包文件支持
    public void myMethod() {
    };

}
UserDAO.java
package com.bebig.dao;

import com.bebig.model.User;

public interface UserDAO {
    public void save(User u);
    public void deleteById(int id);
}
UserDAOImpl.java
package com.bebig.dao.impl;

import org.springframework.stereotype.Repository;
import com.bebig.dao.UserDAO;
import com.bebig.model.User;

@Repository
public class UserDAOImpl implements UserDAO {

    @Override
    public void save(User u) {
        System.out.println("a user saved!");
    }

    @Override
    public void deleteById(int id) {
        System.out.println("delete a user by id!");
        
    }

}
User.java
package com.bebig.model;

public class User {
    private String username;
    private String password;

    public String getPassword() {
        return password;
    }

    public String getUsername() {
        return username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}
UserService.java
package com.bebig.service;

import javax.annotation.Resource;
import org.springframework.stereotype.Service;

import com.bebig.dao.UserDAO;
import com.bebig.model.User;

@Service("userService")
public class UserService {
    private UserDAO userDAO;

    public void add(User u) {
        userDAO.save(u);

    }

    public void deleteById(int id) {
        userDAO.deleteById(id);

    }

    @Resource
    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void init() {
        System.out.println("init.");
    }

    public void destory() {
        System.out.println("destory.");
    }
}
beans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <!-- a service object; we will be profiling its methods -->
    <context:annotation-config />
    <context:component-scan base-package="com.bebig" />
    <!-- 动态代理Annotation编写方法 -->
    <aop:aspectj-autoproxy/>

</beans>
UserServiceTest.java
package com.bebig.service;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bebig.model.User;

public class UserServiceTest {

    @Test
    public void testAdd() throws Exception {
        ClassPathXmlApplicationContext cxt = new ClassPathXmlApplicationContext(
                "beans.xml");
        // 不再需要使用Proxy对象来创建代理对象
        UserService service = (UserService) cxt.getBean("userService");
        service.add(new User());
        service.deleteById(1);
    }

}