Spring---->采用静态配置文件方式实现AOP

spring对AOP的支持（采用配置文件的方式）

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、配置如下

<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>

二、例子代码

UserManager.java

package com.ncepu.spring;

public interface UserManager {
public void add(String name,String password);
public void delete(int id);
public void modify(String name,String password);
public void find (int id);
}

UserManagerImpl.java

package com.ncepu.spring;

public class UserManagerImpl implements UserManager {

@Override
public void add(String name, String password) {
System.out.print("添加用户");

}

@Override
public void delete(int id) {
System.out.print("删除用户");

}

@Override
public void find(int id) {
System.out.print("查找用户");
}

@Override
public void modify(String name, String password) {
System.out.print("修改用户");

}

}

SecurityHandler.java

package com.ncepu.spring;

public class SecurityHandler {

private void checkSecurity() {
System.out.println("安全性检查");
}

}

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

package com.ncepu.spring;

import org.aspectj.lang.JoinPoint;

public class SecurityHandler {

private void checkSecurity(JoinPoint jointpoint) {
Object[] args=jointpoint.getArgs();

for(int i=0;i<args.length;i++)
System.out.println(args[i]);
System.out.println(jointpoint.getSignature().getName());
System.out.println(jointpoint.getTarget());
System.out.println("安全性检查");
}

}

Client.java

package com.ncepu.client;

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

import com.ncepu.spring.UserManager;

public class Client {

public static void main(String args[])
{
BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
UserManager userManager=(UserManager)factory.getBean("usermanager");
userManager.add("wsz","ncepu");
}

}

applicationContext.xml

<bean id="usermanager" class="com.ncepu.spring.UserManagerImpl"></bean>
<bean id="securityHandler" class="com.ncepu.spring.SecurityHandler"></bean>

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