Java?SpringAOP技術(shù)之注解方式詳解

更新時間：2022年02月23日 11:55:21 作者：C'z?x

這篇文章主要為大家詳細介紹了Java?SpringAOP技術(shù)之注解方式，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下，希望能夠給你帶來幫助

1.配置xml掃描注解

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--開啟注解掃描-->
    <context:component-scan base-package="com.qcby"></context:component-scan>
</beans>

2.配置注解

package com.qcby;
import org.springframework.stereotype.Component;
@Component(value = "user")
public class User {
    //連接點/切入點
    public void add(){
        System.out.println("add......");
    }
}

給切面類添加注解 @Aspect，編寫增強的方法，使用通知類型注解聲明

@Component
@Aspect  //生成代理對象
public class UserProxy {
}

3.配置文件中開啟自動代理

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--開啟掃描-->
    <context:component-scan base-package="com.qcby"></context:component-scan>
    <!--開啟Aspect生成代理對象-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

4.通知類型注解

@Before -- 前置通知

@AfterReturing -- 后置通知

@Around -- 環(huán)繞通知（目標對象方法默認不執(zhí)行的，需要手動執(zhí)行）

@After -- 最終通知

@AfterThrowing -- 異常拋出通知

package com.qcby;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
@Component
@Aspect  //生成代理對象
public class UserProxy {
    //增強/通知  ---》前置通知
    @Before(value = "execution(public void com.qcby.User.add())")
    public void before(){
        System.out.println("前置通知.............");
    }
    // 環(huán)繞通知
    @Around(value = "execution(public void com.qcby.User.add())")
    public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("環(huán)繞前置.............");
        //  執(zhí)行被增強的方法
        proceedingJoinPoint.proceed();
        System.out.println("環(huán)繞后置.............");
    }
    // 最終通知
    @After(value = "execution(public void com.qcby.User.add())")
    public void after() {
        System.out.println("最終通知.............");
    }
    //后置通知
    @AfterReturning(value = "execution(public void com.qcby.User.add())")
    public void afterReturning() {
        System.out.println("后置通知.............");
    }
    //異常通知
    @AfterThrowing(value = "execution(public void com.qcby.User.add())")
    public void afterThrowing() {
        System.out.println("出錯了.............");
    }
}

5.測試類

package com.qcby.test;
import com.qcby.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UserTest {
    @Test
    public void aopTest1(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("SpringConfig.xml");
        User user = (User) applicationContext.getBean("user");
        user.add();
    }
}