SpringAOP01前置增强MethodBeforeAdvice

编程

package com.test.springadvicetype;

import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;

import java.util.Date;

/**

* 服务员类

*/

@Component

public class Waiter {

/**

* 服务

* @param name

*/

public String serve(String name) {

System.out.println(name + ",您好,很高兴为您服务。");

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

return name + ",您好,现在是北京时间" + format.format(new Date());

}

/**

* 开车

* @param name

*/

public void driving(String name) {

throw new RuntimeException(name + ",您好,禁止酒后驾车!");

}

}

2、方法调用前增强,实现 MethodBeforeAdvice 接口

package com.test.springadvicetype.afterretuningadvice;

import org.springframework.aop.MethodBeforeAdvice;

import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**

* 前置增强实现类

*/

@Component

public class SpringBeforeAdvice implements MethodBeforeAdvice {

@Override

public void before(Method method, Object[] args, Object target) throws Throwable {

String methodName = method.getName();

System.out.printf("MethodBeforeAdvice增强的方法是%s%n", methodName);

System.out.printf("MethodBeforeAdvice增强的方法的参数是%s%n", args[0]);

System.out.printf("MethodBeforeAdvice增强的对象是%s%n", target);

}

}

3、xml配置,spring-chapter3-springaoptype.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:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd">

<!-- 开启注解扫描 -->

<context:component-scan base-package="com.test.springadvicetype"/>

</beans>

4、运行程序

package com.test.springadvicetype.beforeadvice;

import com.test.springadvicetype.Waiter;

import org.springframework.aop.framework.ProxyFactory;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

* Spring前置增强测试

*/

public class SpringBeforeAdviceDemo {

public static void main(String[] args) {

System.out.println("Spring前置增强测试");

System.out.println("==========我是分割线==========");

ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-chapter3-springaoptype.xml");

Waiter waiter = (Waiter) context.getBean("waiter");

SpringBeforeAdvice advice = (SpringBeforeAdvice) context.getBean("springBeforeAdvice");

//Spring提供的代理工厂

ProxyFactory pf = new ProxyFactory();

//设置代理目标

pf.setTarget(waiter);

pf.addAdvice(advice);

//生成代理实例

Waiter proxy = (Waiter)pf.getProxy();

proxy.serve("Michael");

System.out.println("==========我是分割线==========");

proxy.serve("Tommy");

}

}

5、运行结果

Spring前置增强测试

==========我是分割线==========

MethodBeforeAdvice增强的方法是serve

MethodBeforeAdvice增强的方法的参数是Michael

MethodBeforeAdvice增强的对象是com.test.springadvicetype.Waiter@5276e6b0

Michael,您好,很高兴为您服务。

==========我是分割线==========

MethodBeforeAdvice增强的方法是serve

MethodBeforeAdvice增强的方法的参数是Tommy

MethodBeforeAdvice增强的对象是com.test.springadvicetype.Waiter@5276e6b0

Tommy,您好,很高兴为您服务。

 

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