spring aop3

spring对AOP的支持

Aspect默认情况下不用实现接口，但对于目标对象（UserManagerImpl.java），在默认情况下必须实现接口
如果没有实现接口必须引入CGLIB库

我们可以通过Advice中添加一个JoinPoint参数，这个值会由spring自动传入，从JoinPoint中可以取得

参数值、方法名等等

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);
}
}

import org.aspectj.lang.JoinPoint;


public class SecurityHandler {

private void checkSecurity(JoinPoint joinPoint) {
Object[] args = joinPoint.getArgs();
for (int i=0; i<args.length; i++) {
System.out.println(args[i]);
}

System.out.println(joinPoint.getSignature().getName());
System.out.println("----------checkSecurity()---------------");
}

}

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);
}

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()---------------");
// }
}

applicationContext.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: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">

<bean id="securityHandler" class="com.bjsxt.spring.SecurityHandler"/>           

<bean id="userManager" class="com.bjsxt.spring.UserManagerImpl"/>

<aop:config>
<aop:aspect id="security" ref="securityHandler">
<aop:pointcut id="allAddMethod" expression="execution(* com.bjsxt.spring.UserManagerImpl.add*(..))"/>
<aop:before method="checkSecurity" pointcut-ref="allAddMethod"/>
</aop:aspect>
</aop:config>
</beans>