spring--AOP--权限---demo1---bai

AOP权限DEMO1：

实体类：

package com.etc.entity;

import org.aspectj.lang.annotation.Pointcut;

public class User implements IUser
{
public static int NORMAL = 1;//普通用户角色
public static int ADMIN = 2;    //管理员角色
private int role;  //所属的角色

public int getRole() {
return role;
}

public void setRole(int role) {
this.role = role;
}

public void login() {
System.out.println("执行登录了！");

}

public void reg() {
System.out.println("执行注册了！");
//throw new RuntimeException("注册过程发生异常！");
}

}
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实体类需实现的接口：

package com.etc.entity;

//定义用户接口
public interface IUser
{
void login(); //登录
void reg(); //注册

}
=================================================================
通知类：

package com.etc.advice;

import java.util.Calendar;

import org.aspectj.lang.ProceedingJoinPoint;

import com.etc.entity.User;

//实现权限校验的通知.规定周三不能登录系统
public class PrivilegeAdvice
{

public void  around(ProceedingJoinPoint point) throws Throwable
{
//获得该通知被织入的目标对象
User u = (User) point.getTarget();

//1 今天是星期几？
Calendar c = Calendar.getInstance();

int day = c.get(Calendar.DAY_OF_WEEK);
if((day-1)==5&&u.getRole()==User.ADMIN)
{
System.out.println("周三普通用户不能登录本系统！");
return;
}
point.proceed();//允许代码继续往前

}
}

=================================================================
配置文件：

<?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:p="http://www.springframework.org/schema/p"
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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- 定义1个业务类对象 -->
<bean id="user" class="com.etc.entity.User">
<property name="role" value="2"></property>
</bean>
<!-- 定义1个通知类对象  -->
<bean id="myadv2" class="com.etc.advice.PrivilegeAdvice">
</bean>
<aop:config>
<!-- 配置切点的集合、即切线 -->
<aop:pointcut expression="execution(* com.etc.entity.User.*(..))" id="mypc"/>
<!-- 配置切入的方向 ，即切面-->
<aop:aspect ref="myadv2">
<!-- 前置通知 -->
<aop:before method="around" pointcut-ref="mypc"/>
</aop:aspect>
</aop:config>

</beans>
===============================================
测试类：

package com.etc.test;

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

import com.etc.entity.IUser;

public class Test {
public static void main(String[] args)
{
BeanFactory fac = new ClassPathXmlApplicationContext("applicationContext.xml");
IUser u = (IUser) fac.getBean("user");

//执行业务方法
u.login();
System.out.println("=====");

try
{
u.reg();
} catch (Exception e)
{

}
}
}
=====================================================================