Spring Framework_学习记录_14

短命女 2022-03-01 12:34 152阅读 0赞

### 1.Component And Annotations ###

*  Circle.java

package org.zcs.spring;
    
    import javax.annotation.PostConstruct;
    import javax.annotation.PreDestroy;
    import javax.annotation.Resource;
     
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.stereotype.Component;
     
    @Component
    public class Circle implements Shape { 
    
    	private Point center;
    	public Point getCenter() { 
    		return center;
    	}
    	 @Resource 
    	public void setCenter(Point center) { 
    		this.center = center;
    	}
    	 @PostConstruct
    	 public void initlize() { 
    		 System.out.println("initlizing a circle ");
    	 }
    	 @PreDestroy
    	 public void destroy() { 
    		 System.out.println("destroy a circle");
    	 }
    	@Override
    	public void draw() { 
    		// TODO Auto-generated method stub
    		System.out.println("Drawing Circle:");
    		System.out.println("Circle : point is : " + center.getX() +","  + center.getY());
    		
    	}
    	
    }

*  Triangle.java

package org.zcs.spring;
    
     
    
    public class Triangle   implements Shape { 
    	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("Drawing Triangle :");
    		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:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
     			<context:annotation-config />
    
       	
       	<bean id= "pointA" class = "org.zcs.spring.Point">
    
       		 <qualifier  value = "circleRelated"></qualifier>
       		<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= "center" class = "org.zcs.spring.Point">
    		   <property name="x"  value = "0"></property>
    		   <property name="y"  value = "20"></property>
       	</bean>
     	
       	
       	<context:component-scan base-package="org.zcs.spring"></context:component-scan>
       	 	<bean class = "org.zcs.spring.MyBeanFactory" ></bean>
       	<bean class = "org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
       		<property name="locations" value = "pointsconfig.properties"></property>
       	</bean>
       	 <bean class = "org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor">
       	 </bean>
       	
      </beans>

### 学习记录 ###

*  学习了一个神奇的注释：component，`<context:component-scan base-package="org.zcs.spring"></context:component-scan>`，直接就能显示运行circle.