Spring Framework_学习记录_10

桃扇骨 2022-03-01 03:22 140阅读 0赞

### 1.Writing a BeanFactoryPostProcessor ###

*  DrawingApp.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();
    		 ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
     
    		Triangle triangle = (Triangle)context.getBean("triangle");
    		triangle.draw();
    	}
    }

*  MyBeanFactory.java

package org.zcs.spring;
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
    
    public class MyBeanFactory implements  BeanFactoryPostProcessor { 
    
       @Override
       public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0) throws BeansException { 
       	// TODO Auto-generated method stub
       	System.out.println("My Bean Factory Post Processor is called");
       }
    
    }

*  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() +")");
       }
    
    
    
    }

*  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 = "${pointA.pointX}"></property>
       		<property name="y"  value = "${pointA.pointY}"></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.MyBeanFactory" ></bean>
       	<bean class = "org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
       		<property name="locations" value = "pointsconfig.properties"></property>
       	</bean>
      </beans>

*  pointsconfig.properties

pointA.pointX=1
    pointA.pointY=1

### 2.错误记录 ###

*  报错信息：

三月 21, 2019 4:06:45 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@e2144e4: startup date [Thu Mar 21 16:06:45 CST 2019]; root of context hierarchy
    三月 21, 2019 4:06:45 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [spring.xml]
    Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [spring.xml]; nested exception is java.io.FileNotFoundException: class path resource [spring.xml] cannot be opened because it does not exist
    	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:343)
    	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)
    	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216)
    	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:187)
    	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:251)
    	at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
    	at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
    	at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
    	at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:454)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    	at org.zcs.spring.DrawingApp.main(DrawingApp.java:16)
    Caused by: java.io.FileNotFoundException: class path resource [spring.xml] cannot be opened because it does not exist
    	at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:158)
    	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:329)
    	... 13 more

*  解决办法：  
    将properties文件放到src目录下就可以了

#### 3.学习记录 ####

*  本次学习了如何将properties文件的值给bean中的value。
 *  还有beanfactory的使用流程简介。