Spring AOP-03-環繞加強 MethodInterceptor

一、要增加強的類

package com.test.springadvicetype;

import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 服務員類
 */
@Component
public class Waiter {
    /**
     * 服務
     * @param name
     */
    public String serve(String name) {
        System.out.println(name + ",您好，很高興爲您服務。");
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        return name + ",您好，如今是北京時間" + format.format(new Date());
    }

    /**
     * 開車
     * @param name
     */
    public void driving(String name) {
        throw new RuntimeException(name + "，您好，禁止酒後駕車！");
    }
}

二、環繞加強，實現 MethodInterceptor 接口

package com.test.springadvicetype.methodinterceptor;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.stereotype.Service;

/**
 * 環繞加強
 */
@Service
public class SpringMethodInterceptor implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        // 前置加強
        System.out.println("前置加強執行了");
        // 經過反射機制調用目標方法
        Object obj = invocation.proceed();
        // 後置加強
        System.out.println("後置加強執行了");
        return obj;
    }
}

三、xml，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">
    <!-- 開啓註解掃描 -->
    <context:component-scan base-package="com.test.springadvicetype"/>
</beans>

四、運行測試代碼

package com.test.springadvicetype.methodinterceptor;

import com.test.springadvicetype.Waiter;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Spring環繞加強測試
 */
public class SpringMethodInterceptorDemo {

    public static void main(String[] args) {
        System.out.println("Spring環繞加強測試");
        System.out.println("==========我是分割線==========");
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-chapter3-springaoptype.xml");
        Waiter waiter = (Waiter) context.getBean("waiter");
        SpringMethodInterceptor advice = (SpringMethodInterceptor) context.getBean("springMethodInterceptor");
        //Spring提供的代理工廠
        ProxyFactory pf = new ProxyFactory();
        //設置代理目標
        pf.setTarget(waiter);
        pf.addAdvice(advice);
        //生成代理實例
        Waiter proxy = (Waiter)pf.getProxy();
        proxy.serve("Michael");
        System.out.println("==========我是分割線==========");
        proxy.serve("Tommy");
    }
}

五、運行結果

Spring環繞加強測試
==========我是分割線==========
前置加強執行了
Michael,您好，很高興爲您服務。
後置加強執行了
==========我是分割線==========
前置加強執行了
Tommy,您好，很高興爲您服務。
後置加強執行了