SpringAOP

最新推荐文章于 2023-04-14 08:47:44 发布

原创最新推荐文章于 2023-04-14 08:47:44 发布 · 188 阅读

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SpringAOP

定义：面向切面编程。本人的理解就是，给代码包装，这个包装可以在方法执行前面，也可在方法执行后面。

有了这样的方法就可以做一些操作，方法执行前或后的判断。下面是我配置的两种SpringAOP：

一、XML配置

dao层接口代码：

public interface StudentDao {

    String getInfo(String name);

}

dao层实现类：

@Component
public class StudentDaoImpl implements StudentDao{

    @Override
    public String getInfo(String name){
        System.out.println("-----getInfo----");
//        int i =1/0;
//        return i;
        return "11111";
    }
}

切面代码块：

public class AspectJ {


   public void before(String name){
       System.out.println("方法执行前："+name);
   }


   public void after(String name){
       System.out.println("方法执行后："+name);
   }

   public void afterReturning(String name,String msg){
       System.out.println("方法执行后返回："+name+",返回值为："+msg);
   }

   public void afterReturnThrowable(String name,Throwable throwable){
       System.out.println("方法执行后返回："+name+",返回异常为："+throwable);
   }

   public void round(ProceedingJoinPoint joinPoint){
       String name = (String)joinPoint.getArgs()[0];
       try {
           System.out.println("方法执行前："+name);
           joinPoint.proceed();
           System.out.println("方法执行后："+name);
       } catch (Throwable throwable) {
           throwable.printStackTrace();
           System.out.println("方法执行后抛出异常："+throwable);
       }
   }
}

XML文件：

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    <bean id="studentDao" class="com.speark.demo.test.SpringAOP.Dao.StudentDaoImpl"/>
    <bean id="aspectJ" class="com.speark.demo.test.SpringAOP.AOP.AspectJ"/>

    <!--aop配置-->
    <aop:config>

        <!--切面配置-->
        <aop:aspect id="student" ref="aspectJ">

           <!--切点配置-->
            <aop:pointcut id="studentAOP" expression="execution(* com.speark.demo.test.SpringAOP.Dao.StudentDaoImpl.*(..)) and args(name)"/>

            <!--前置(方法执行前)-->
            <aop:before method="before" arg-names="name" pointcut-ref="studentAOP"/>
<!--        -->
            <!--后置(方法执行后)-->
            <aop:after method="after" arg-names="name" pointcut-ref="studentAOP"/>
<!--        -->
            <!--后置返回(方法执行后返回)-->
            <aop:after-returning method="afterReturning" arg-names="name,msg" pointcut-ref="studentAOP" returning="msg"/>

            <!--后置抛出异常(方法执行后抛出异常)-->
            <aop:after-throwing method="afterReturnThrowable" pointcut-ref="studentAOP" arg-names="name,throwable" throwing="throwable"/>

            <!--环绕-->
<!--            <aop:around method="round" pointcut-ref="studentAOP" />-->
        </aop:aspect>
    </aop:config>
</beans>

测试类：

public class AopTest {

    @Test
    public void test(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("SpringAOP.xml");
        StudentDao studentDao = (StudentDao)context.getBean("studentDao");
        studentDao.getInfo("你好");
    }
}

测试结果：

在这里插入图片描述

二、注解配置

切面代码块：

@Aspect
@Component
public class AspectJ {


    @Pointcut(value = "execution(* com.speark.demo.test.SpringAOP.Dao.StudentDaoImpl.getInfo(..)) && args(name)",argNames = "name")
    public void geDemo(String name){

    }

    @Before("geDemo(name)")
   public void before(String name){
       System.out.println("方法执行前："+name);
   }

   @After("geDemo(name)")
   public void after(String name){
       System.out.println("方法执行后："+name);
   }

   @AfterReturning(value = "geDemo(name)",returning = "msg")
   public void afterReturning(String name,String msg){
       System.out.println("方法执行后返回："+name+",返回值为："+msg);
   }

   public void afterReturnThrowable(String name,Throwable throwable){
       System.out.println("方法执行后返回："+name+",返回异常为："+throwable);
   }

   public void round(ProceedingJoinPoint joinPoint){
       String name = (String)joinPoint.getArgs()[0];
       try {
           System.out.println("方法执行前："+name);
           joinPoint.proceed();
           System.out.println("方法执行后："+name);
       } catch (Throwable throwable) {
           throwable.printStackTrace();
           System.out.println("方法执行后抛出异常："+throwable);
       }
   }
}

代理类：

@Configuration
@EnableAspectJAutoProxy//开启自动代理默认jdk代理
@ComponentScan(basePackages = "com.speark.demo.test.SpringAOP")//自动扫描注解
public class AopConfig {
}

测试类代码：

public class AopTest {

    @Test
    public void AnnotationAopTest(){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AopConfig.class);
        StudentDao studentDao = (StudentDao)context.getBean("studentDaoImpl");
        studentDao.getInfo("123");
    }

}