Spring Framework_学习记录_09

客官°小女子只卖身不卖艺 2022-03-01 02:43 153阅读 0赞

### 1.Writing a BeanPostProcessor ###

*  DrwaingApp.java

package org.zcs.spring;
    
    import org.springframework.beans.factory.BeanFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.AbstractApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import org.springframework.context.support.FileSystemXmlApplicationContext;
     
    
    public class DrawingApp { 
    
    	public static void main(String[] args) { 
    		// TODO Auto-generated method stub
    		//BeanFactory factory = new FileSystemXmlApplicationContext("src/spring.xml");
    		//Triangle triangle = new Triangle();
    		AbstractApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
    		context.registerShutdownHook();
    		Triangle triangle = (Triangle)context.getBean("triangle");
    		triangle.draw();
    	}
    }

*  Triangle.java

package org.zcs.spring;
    
     
    
    public class Triangle    { 
    	private Point pointA;
    	private Point pointB;
    	private Point pointC;
    	public Point getPointA() { 
    		return pointA;
    	}
    
    	public void setPointA(Point pointA) { 
    		this.pointA = pointA;
    	}
    
    	public Point getPointB() { 
    		return pointB;
    	}
    
    	public void setPointB(Point pointB) { 
    		this.pointB = pointB;
    	}
    
    	public Point getPointC() { 
    		return pointC;
    	}
    
    	public void setPointC(Point pointC) { 
    		this.pointC = pointC;
    	}
    	public void draw () { 
    	
    			System.out.println("This is PointA: (" +pointA.getX()  +"," + pointA.getY() +")");
    			System.out.println("This is PointB: (" +pointB.getX()  +"," + pointB.getY() +")");
    			System.out.println("This is PointC: (" +pointC.getX()  +"," + pointC.getY() +")");
    	}
    
     
    
    }

*  DisplayNameBeanProcessor.java

package org.zcs.spring;
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.config.BeanPostProcessor;
    
    public class DisplayNameBeanProcessor implements BeanPostProcessor { 
    
    	@Override
    	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { 
    		// TODO Auto-generated method stub
    		System.out.println("In After Initialization method. Bean name is " + beanName);
    		return bean;
    	}
    
    	@Override
    	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { 
    		// TODO Auto-generated method stub
    		 System.out.println("In before Initialzation methods , Bean name is : "  + beanName);
    		 return bean;
    	}
    	
    }

*  spring.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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd" >
     
       
       	<bean id = "triangle" class= "org.zcs.spring.Triangle"  autowire= "byName"  >
     		  
     		 <property name="pointA" ref = "pointA"></property>
     		 <property name="pointB" ref = "pointB"></property>
     		 <property name="pointC" ref = "pointC"></property>
     		
       	</bean>
       	
       	<bean id= "pointA" class = "org.zcs.spring.Point">
       		<property name="x"  value = "0"></property>
       		<property name="y"  value = "0"></property>
       	</bean>
       	<bean id= "pointB" class = "org.zcs.spring.Point">
    		<property name="x"  value = "20"></property>
    		<property name="y"  value = "0"></property>
    	</bean>
    
     	<bean id= "pointC" class = "org.zcs.spring.Point">
    		   <property name="x"  value = "0"></property>
    		   <property name="y"  value = "20"></property>
       	</bean>
     	<bean class = "org.zcs.spring.DisplayNameBeanProcessor">
     	
     	</bean>
       	
      </beans>

#### 2.学习记录 ####

*  本次主要学习了如何使用BeanPostProcessor.java
 *  使用它来显示bean的名字。