在Spring中如何使用動態(tài)代理?

更新時間：2021年06月25日 15:25:42 作者：紅旗下的小兵

上篇文章記錄自定義切面,下邊記錄使用注解來編寫自定義切面,文中有非常詳細的介紹及代碼示例,需要的朋友可以參考下

Spring動態(tài)代理

定義自定義切面 - diyNodePoint

package com.lxc.diy;
 
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
 
/**
 * @Aspect 標注這個了是一個切面
 * @Before("切入點") === <aop:before method="beforeLog" pointcut-ref="point" />
 * @After("切入點") === <aop:after method="afterLog" pointcut-ref="point" />
 */
@Aspect
public class diyNotePoint {
   @Before("execution(* com.lxc.service.UserServiceImp.*(..))")
   public void before() {
       System.out.println("前置切面");
   }
   @After("execution(* com.lxc.service.UserServiceImp.*(..))")
   public void after() {
       System.out.println("后置切面");
   }
}

定義接口 - UserService

package com.lxc.service;
 
public interface UserService {
    public void query();
    public void delete();
    public void edit();
    public void add();
}

重寫接口類 - UserServiceImp

package com.lxc.service;
public class UserServiceImp implements UserService{
    @Override
    public void query() {
        System.out.println("query");
    }
    @Override
    public void delete() {
        System.out.println("delete");
    }
    @Override
    public void edit() {
        System.out.println("edit");
    }
    @Override
    public void add() {
        System.out.println("add");
    }
}

beans.xml中配置：

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <!--定義bean-->
    <bean id="imp" class="com.lxc.service.UserServiceImp"/>
    <bean id="diyNotePoint" class="com.lxc.diy.diyNotePoint" />
    <!--添加：注解支持-->
    <aop:aspectj-autoproxy />
 
</beans>

測試：

import com.lxc.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Test {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        UserService userService = ctx.getBean("imp", UserService.class);
        userService.add();
    }
}

輸出如下：