Spring AspectJ 框架配置详情

川长思鸟来 2022-05-20 05:20 209阅读 0赞

Aspect J 是一个基于Java语言的AOP框架

使用Aspect J需要导入Spring AOP 和 Aspect J的相关jar包

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### **工程结构：**    ###

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![70 2][]

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### **相关类：**    ###

StudentServiceI.java

package com.baidu.beans2;
    
    public interface StudentServiceI {
    	
    	void delete();
    	
    	String add();
    
    }

StudentServiceImpl.java

package com.baidu.beans2;
    
    public class StudentServiceImpl implements StudentServiceI{
    
    	@Override
    	public void delete() {
    		// TODO Auto-generated method stub
    		System.out.println("delete student...");
    	}
    
    	@Override
    	public String add() {
    		// TODO Auto-generated method stub
    		System.out.println("add student...");
    		return "add";
    	}
    
    }

### Aspect J的几种增强：    ###

@Before 前置通知，相当于BeforeAdvice  
@AfterReturning 后置通知，相当于AfterReturningAdvice  
@Around 环绕通知，相当于MethodInterceptor  
@AfterThrowing抛出通知，相当于ThrowAdvice  
@After 最终final通知，不管是否异常，该通知都会执行  
@DeclareParents 引介通知，相当于IntroductionInterceptor

### **方式一：**MyAspectJ.java ###

package com.baidu.beans2;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    
    @Aspect
    public class MyAspect {
    
    	@Before(value="execution(* com.baidu.beans2..*(..))")
    	public void myBefore(JoinPoint joinPoint) {
    		System.out.println("前置增强。。。"+joinPoint);
    		
    	}
    	@AfterReturning(value="execution(* com.baidu.beans2..*(..))",returning="reval")
    	public void myAfterReturning(JoinPoint joinPoint,Object reval) {
    		System.out.println("后置增强！！！,返回值"+reval);
    		
    	}
    	@Around(value="execution(* com.baidu.beans2..*(..))")
    	public void myAround(ProceedingJoinPoint joinPoint) throws Throwable {
    		System.out.println("1.环绕增强前");
    		Object res = joinPoint.proceed();
    		System.out.println("2.环绕增强后"+res);
    	}
    }

###  ###

### **方式二：**MyAspectJ.java ###

### **配置beans3.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"
           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">
    		
    	<aop:aspectj-autoproxy/>
            	
    	<bean id="studentServiceImpl" class="com.baidu.beans2.StudentServiceImpl"></bean>
            
             <bean class="com.baidu.beans2.MyAspect"></bean>
    </beans>

### **execution表达式：** ###

![70 4][]

[70]: /images/20220520/4a9c5ec64f7f46a8964dd318c409536c.png
[70 1]: /images/20220520/c97c932d1d9f41f68fd9cb05f93fd2f6.png
[70 2]: /images/20220520/d281d6893d9c4fc7a98af69530f35307.png
[70 3]: /images/20220520/156aab0a11dd496fa3ee3619c453a314.png
[70 4]: /images/20220520/ec3f0fa2bc7f4be58bb2c19f5b54655d.png