java spring Writing a BeanPostProcessor

最新推荐文章于 2025-01-08 18:51:33 发布

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本文展示了如何使用Java实现图形绘制，并通过Spring框架进行整合，具体包括使用Triangle类进行三角形绘制，以及如何配置Spring上下文来管理Bean。

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DisplayNameBeanPostProcessor.java

package zxl;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class DisplayNameBeanPostProcessor 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 initialization method bean name is "+beanName);
	return bean;
	}

}

DrawingApp.java

package zxl;


import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DrawingApp {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
		Triangle triangle =(Triangle) context.getBean("triangle");
		triangle.draw();
	}

}

Point.java

package zxl;

public class Point {
	private int x;
	private int y;
	
	public int getX() {
		return x;
	}
	public void setX(int x) {
		this.x = x;
	}
	public int getY() {
		return y;
	}
	public void setY(int y) {
		this.y = y;
	}
	
}

Triangle.java

package zxl;

import java.util.List;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


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("point A ("+getPointA().getX()+","+getPointA().getY()+")");
		System.out.println("point B ("+getPointB().getX()+","+getPointB().getY()+")");
		System.out.println("point C ("+getPointC().getX()+","+getPointC().getY()+")");
		
	}

}

spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>

   
    <bean id="triangle"  class="zxl.Triangle"  >
        <property name="pointA" ref="pointA" />	
		<property name="pointB" ref="pointB" />
		<property name="pointC" ref="pointC" />
    </bean>
    
    
    <bean id="pointA" class="zxl.Point" >
        <property name="x" value="0" />
        <property name="y" value="0" />
    </bean>

    <bean id="pointB" class="zxl.Point" >
        <property name="x" value="-20" />
        <property name="y" value="0" />
    </bean>

    <bean id="pointC" class="zxl.Point" >
        <property name="x" value="20" />
        <property name="y" value="0" />
    </bean>

    <bean class="zxl.DisplayNameBeanPostProcessor" />
    
</beans>