Spring>采用静态配置文件方式实现AOP 小强斋

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>