AOP1

spring对AOP的只是（采用Annotation的方式）

1、spring依赖库
* SPRING_HOME/dist/spring.jar
* SPRING_HOME/lib/jakarta-commons/commons-logging.jar
* SPRING_HOME/lib/log4j/log4j-1.2.14.jar
* SPRING_HOME/lib/aspectj/*.jar

2、采用Aspect定义切面

2、在Aspect定义Pointcut和Advice

4、启用AspectJ对Annotation的支持并且将Aspect类和目标对象配置到Ioc容器中

注意：在这种方法定义中，切入点的方法是不被执行的，它存在的目的仅仅是为了重用切入点
即Advice中通过方法名引用这个切人点

AOP:
* Cross cutting concern
* Aspect
* Advice
* Pointcut
* Joinpoint
* Weave
* Target Object
* Proxy
* Introduction


applicationContext.xml

引用

<?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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<aop:aspectj-autoproxy/>
<bean id="securityHandler" class="com.bjsxt.spring.SecurityHandler"/>          
<bean id="userManager" class="com.bjsxt.spring.UserManagerImpl"/>
</beans>

UserManager.java

package com.bjsxt.spring;

public interface UserManager {

	public void addUser(String username, String password);
	
	public void deleteUser(int id);
	
	public void modifyUser(int id, String username, String password);
	
	public String findUserById(int id);
}

UserManagerImpl.java

package com.bjsxt.spring;

public class UserManagerImpl implements UserManager {

	public void addUser(String username, String password) {
		System.out.println("-------UserManagerImpl.addUser()----------");
	}

	public void deleteUser(int id) {
		System.out.println("-------UserManagerImpl.deleteUser()----------");
	}

	public String findUserById(int id) {
		System.out.println("-------UserManagerImpl.findUserById()----------");
		return null;
	}

	public void modifyUser(int id, String username, String password) {
		System.out.println("-------UserManagerImpl.modifyUser()----------");
	}
	
//	private void checkSecurity() {
//		System.out.println("----------checkSecurity()---------------");
//	}
}

SecurityHandler.java

package com.bjsxt.spring;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

/**
 * 定义Aspect
 * @author Administrator
 *
 */
@Aspect
public class SecurityHandler {
	
	/**
	 * 定义Pointcut,Pointcut的名称就是allAddMethod，此方法不能有返回值和参数，该方法只是一个
	 * 标识
	 * 
	 * Pointcut的内容是一个表达式，描述那些对象的那些方法（订阅Joinpoint）
	 */
	@Pointcut("execution(* add*(..)) || execution(* del*(..))")
	private void allAddMethod(){};
	
	/**
	 * 定义Advice，标识在那个切入点何处织入此方法
	 */
	@Before("allAddMethod()")
	private void checkSecurity() {
		System.out.println("----------checkSecurity()---------------");
	}
	
}

Client.java

package com.bjsxt.spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Client {

	public static void main(String[] args) {
		BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
		
		UserManager userManager = (UserManager)factory.getBean("userManager");
		
		userManager.addUser("张三", "123");
		userManager.deleteUser(1);
	}
}