AOP的两种实现(注解&XML)(二)

墨蓝 2022-05-14 11:24 199阅读 0赞

**AOP的两种实现方式：**

**<1>.注解方式：**简化配置文件，加如注解扫描即可。。

**1.注入maven依赖包:**

![70][]

**2.定义一个StuServiceIml类，有切入点（被增强的方法）；**

package com.spring.service;
    
    import org.springframework.stereotype.Repository;
    
    @Repository("stuServiceIml")
    public class StuServiceIml implements StuService {
        
        public void aopTest()
        {
            System.out.println("我是内部test方法");
        }
    }

**3.定义一个切面类，里面有功能性代码（增强的方法），将功能加入到切入点---切面方法；**

@Component
    @Aspect
    public class AopTest1 {
    
        @Pointcut("execution(* com.spring.service.*.aop*(..))")
        public void pointCut() {}
    
        //在切入点之前执行
        @Before("pointCut()")
        public void before()
        {
            System.out.println("我是切入方法前");
        }
    
        @Around("pointCut()")
        public void around(ProceedingJoinPoint joinPoint) throws Throwable {
    
            //Method[] methods=joinPoint.getTarget().getClass().getDeclaredMethods();
    
            //org.aspectj.lang.Signature signature=joinPoint.getSignature();
    
    
            System.out.println("我是方法环绕的前切入");
            joinPoint.proceed();//执行拦截的方法（环绕时需要知道方法执行的时间节点） 环绕时会将方法执行的权限给切面 方法返回值
            System.out.println("我是方法环绕的后切入");
        }
    
        @After("pointCut()")
        public void after()
        {
            System.out.println("我是切入方法后");
        }
    
    }

**4.配置文件：**

<?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"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    
           xsi:schemaLocation="
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
    		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"
           default-lazy-init="false">
    
        <description>Spring公共配置</description>
        
        <context:component-scan base-package="com.spring"></context:component-scan>
        
        <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    
    </beans>

**5.测试类:**

public class Test {
    
        public static void main(String[] args) {
            ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext.xml");
    
            StuServiceIml stu= (StuServiceIml) app.getBean("stuServiceIml");
            stu.aopTest();
        }
    }

**6.运行结果:**

**<2>.xml方式实现：** 代码简单，需要在配置文件配置切入点，通知（切面方法）等。

xml方式需要在配置文件中配置切入点 通知等，在类中只需要定义方法即可。

**配置文件：**

<?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"
        xmlns:p="http://www.springframework.org/schema/p"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
        
        
        <bean id="stuServiceIml" class="com.spring.service.StuServiceIml">
            
        </bean>  
        
         
        <bean id="aspectTest" class="com.spring.aopTest.AopTest1" />
    
        <aop:config>
         <aop:aspect ref="aspectTest">
            <aop:pointcut id="pointcut" expression="execution(* com.spring.service.*.aop*(..))"/>
            
            <aop:before method="before" pointcut-ref="pointcut"/> 
            
            <aop:after method="after" pointcut-ref="pointcut" /> 
            <aop:around method="around" pointcut-ref="pointcut"/> 
            
          </aop:aspect>
       </aop:config>
    </beans>

[70]: /images/20220514/609fe384da814365aa43d1627d9b7e0f.png