Spring AOP 我的简单测试

关于AOP我只知道它是干嘛的，对于它的原理我是很迷糊的

为了理解它，就先写了一个简单的测试

把Spring的类库放到ClassPath里

首先要写一个接口，因为我测试的代理目标是接口，所以我要先写出一个接

//SayHello.java                

package com.aop                

public interface SayHello {    

    void hello();              

} 

然后给出它的一个实现

//SayHelloImpl.java                                

package com.aop                                    

public class SayHelloImpl implements SayHello {    

    public void hello()                            

    {                                              

        System.out.println("Hello method invoked!");

    }                                              

}                                                   

下面就要写出一个实现了MethodBeforeAdvice接口的类来实现AOP

//MethodBeforeSayHello.java                                       

package com.aop;                                                  

import java.lang.reflect.Method;                                  

import org.springframework.aop.MethodBeforeAdvice;                

public class MethodBeforeSayHello implements MethodBeforeAdvice { 

 public void before(Method arg0, Object[] arg1, Object arg2)      
   throws Throwable {                                             
  System.out.println("This is the method before hello() method!");

 }                                                                

}                                                                 

配置一下XML

 xmlns=""
 xmlns:xsi=""
 xsi:schemaLocation=" ">
   class="com.aop.SayHelloImpl"/>
   class="com.aop.MethodBeforeSayHello"/>
 
   class="org.springframework.aop.framework.ProxyFactoryBean">
  
   com.aop.SayHello
  
  
   
    methodBefore
   
  
  
   
  
 

然后写一个测试类测试一下,假设我把这个XML文件放到C盘目录下

package com.aop;                                                            

import org.springframework.beans.factory.BeanFactory;                       
import org.springframework.beans.factory.xml.XmlBeanFactory;                
import org.springframework.core.io.FileSystemResource;                      

public class SimpleTest {                                                   
 public static void main(String[] args)                                     
 {                                                                          
  String filePath="c:\\applicationContext.xml";//这里就是XML文件绝对路径       
  BeanFactory factory = new XmlBeanFactory(new FileSystemResource(filePath));
  SayHello say = (SayHello)factory.getBean("sayHello");                     
  say.hello();                                                              
 }                                                                          
}                                                                           

输出结果是

This is the method before hello() method!
hello method invoked!

 

//SayHello.java

package com.aop
public interface SayHello {
    void hello();
}

//SayHello.java

package com.aop
public interface SayHello {
    void hello();
}