基于XML配置的Sping AOP详解

蔚落 2022-09-29 15:55 180阅读 0赞

一、编写基本处理方法

package com.kang.sping.xml.aop;
    
    public class Math{
        //加
        public int add(int n1,int n2){
            int result=n1+n2;
            System.out.println(n1+"+"+n2+"="+result);
            return result;
        }
        
        //减
        public int sub(int n1,int n2){
            int result=n1-n2;
            System.out.println(n1+"-"+n2+"="+result);
            return result;
        }
        
        //乘
        public int mut(int n1,int n2){
            int result=n1*n2;
            System.out.println(n1+"*"+n2+"="+result);
            return result;
        }
        
        //除
        public int div(int n1,int n2){
            int result=n1/n2;
            System.out.println(n1+"/"+n2+"="+result);
            return result;
        }
    }

二、编写通知类

package com.kang.sping.xml.aop;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.ProceedingJoinPoint;
    
    /**
     * 通知类，横切逻辑
     *
     */
    public class Advices {
        
        public void before(JoinPoint jp){
            System.out.println("----------前置通知----------");
            System.out.println(jp.getSignature().getName());
        }
        
        public void after(JoinPoint jp){
            System.out.println("----------最终通知----------");
        }
        
        public void afterReturning(JoinPoint joinPoint, Object result){
        	//定义AfterReturning通知方法
        }
        
        public void afterThrowing(JoinPoint joinPoint, Exception e){
        	//定义AfterThrowing通知方法
        }
        
        public Object around(ProceedingJoinPoint pjd){
        	//定义Around通知方法
        	return null;
        }
    }

三、配置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"
    	xmlns:context="http://www.springframework.org/schema/context"
    	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-4.0.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    
    	
    	<bean id="math" class="com.kang.sping.xml.aop.Math"></bean>
    	
    	
    	<bean id="advices" class="com.kang.sping.xml.aop.Advices"></bean>
    	
    	
    	
    	
    	
    	
    	<aop:config proxy-target-class="true">
    	
    		
    		<aop:pointcut expression="execution(* com.kang.sping.xml.aop.Math.*(..))"
    			id="pointcut1" />
    			
    		
    		<aop:aspect ref="advices">
    		
    			
    			<aop:before method="before" pointcut-ref="pointcut1" />
    			<aop:after method="after" pointcut-ref="pointcut1" />
    			
    		</aop:aspect>
    		
    		
    		
    	</aop:config>
    
    
    
    
    
    
    </beans>

四、编写测试方法

package com.kang.sping.xml.aop;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test {
    
        public static void main(String[] args) {
            ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
            Math math = ctx.getBean("math", Math.class);
            int n1 = 100, n2 = 5;
            math.add(n1, n2);
            math.sub(n1, n2);
            math.mut(n1, n2);
            math.div(n1, n2);
        }
    
    }

五、运行结果

![20170316225559197][]

六、总结

正常情况下, 基于注解的声明要优先于基于 XML 的声明. 通过 AspectJ 注解, 切面可以与 AspectJ 兼容, 而基于 XML 的配置则是 Spring 专有的. 由于 AspectJ 得到越来越多的 AOP 框架支持, 所以以注解风格编写的切面将会有更多重用的机会。当使用 XML 声明切面时, 需要在 <beans> 根元素中导入 aop Schema命名空间。

[20170316225559197]: /images/20220708/fcaafe3a2b8242d784a46ede27c35234.png