package com.dennist.dao;
public interface UserDao {public void addUser(String name, String password);public void deleteUser(int id);public void updateUser(int id, String name, String password);public String queryUser(int id);}

package com.dennist.dao.impl;
import com.dennist.dao.UserDao;public class UserDaoImpl implements UserDao{@Overridepublic void addUser(String name, String password) {System.out.println("UserDaoImpl.addUser()");}@Overridepublic void deleteUser(int id) {System.out.println("UserDaoImpl.deleteUser()");}@Overridepublic String queryUser(int id) {System.out.println("UserDaoImpl.queryUser()");return null;}@Overridepublic void updateUser(int id, String name, String password) {System.out.println("UserDaoImpl.updateUser()");}}

package com.dennist.dao.impl;
import com.dennist.dao.UserDao;public class UserDaoImplProxy implements UserDao{private UserDao userDao;public UserDaoImplProxy(UserDao userDao){this.userDao = userDao;}@Overridepublic void addUser(String name, String password) {checkSecurity();this.userDao.addUser(name, password);}@Overridepublic void deleteUser(int id) {checkSecurity();this.userDao.deleteUser(id);}@Overridepublic String queryUser(int id) {checkSecurity();return this.userDao.queryUser(id);}@Overridepublic void updateUser(int id, String name, String password) {checkSecurity();this.userDao.updateUser(id, name, password);}public void checkSecurity(){System.out.println("---------checkSecurity---------");}
}

package com.dennist.client;
import com.dennist.dao.UserDao;
import com.dennist.dao.impl.UserDaoImpl;
import com.dennist.dao.impl.UserDaoImplProxy;public class ClientOpt {public static void main(String[] args) {UserDao userDao = new UserDaoImpl();UserDaoImplProxy userDaoImplProxy = new UserDaoImplProxy(userDao);userDaoImplProxy.addUser("dennisit", "dennisit@163.com");userDaoImplProxy.deleteUser(5);}
}
运行结果:
---------checkSecurity---------
UserDaoImpl.addUser()
---------checkSecurity---------
UserDaoImpl.deleteUser()

package com.dennist.dao.impl;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;public class SecurityHandler implements InvocationHandler{private Object targetObject;public Object newProxy(Object targetObject){this.targetObject = targetObject;//面向接口编程,安全认证加在接口上.return Proxy.newProxyInstance(targetObject.getClass().getClassLoader(), targetObject.getClass().getInterfaces(),this);}@Overridepublic Object invoke(Object proxy, Method method, Object[] args)throws Throwable {checkSecurity();Object result = null;try {result = method.invoke(this.targetObject, args);} catch (Exception e) {e.printStackTrace();}return result;}public void checkSecurity(){System.out.println("---------checkSecurity---------");}
}

package com.dennist.client;
import com.dennist.dao.UserDao;
import com.dennist.dao.impl.SecurityHandler;
import com.dennist.dao.impl.UserDaoImpl;public class ClientOpt {public static void main(String[] args) {SecurityHandler handler = new SecurityHandler();UserDao userDao = (UserDao) handler.newProxy(new UserDaoImpl());userDao.addUser("zhangan", "pwd123");userDao.deleteUser(5);}
}
运行结果:
---------checkSecurity---------
UserDaoImpl.addUser()
---------checkSecurity---------
UserDaoImpl.deleteUser()

package com.spring.dao.impl;public class SecurityHandler {public void checkSecurity() {System.out.println("----------checkSecurity()---------------");}
}

<?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.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"><bean id="securityHandler" class="com.spring.dao.impl.SecurityHandler"/>           <bean id="userDao" class="com.spring.dao.impl.UserDaoImpl"/><aop:config><aop:aspect id="securityAspect" ref="securityHandler"><aop:pointcut id="allAddMethod" expression="execution(* query*(..))||execution(* add*(..))"/><aop:before pointcut-ref="allAddMethod" method="checkSecurity"/></aop:aspect></aop:config></beans>

package com.spring.client;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.spring.dao.UserDao;public class ClientOpt {public static void main(String[] args) {BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");UserDao userDao = (UserDao) factory.getBean("userDao");userDao.addUser("zhangsan", "pwd123");System.out.println("");userDao.deleteUser(5);System.out.println("");userDao.queryUser(3);}
}
运行效果:
----------checkSecurity()---------------
UserDaoImpl.addUser()UserDaoImpl.deleteUser()----------checkSecurity()---------------
UserDaoImpl.queryUser()