16-Writing-a-BeanFactoryPostProcessor

Property place holder configure

DrawingApp.java

package org.yash.watertechsol;

import org.springframework.context.support.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DrawingApp {

      public static void main(String[] args){

            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");

            context.registerShutdownHook();

            Triangle triangle = (Triangle)context.getBean("triangle");

            triangle.draw();

      }

}

Triangle.java

package org.yash.watertechsol;

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()+")");

      }

}

Point.java

package org.yash.watertechsol;

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;

      }

}

MyBeanFactoryPostProcessor.java

package org.yash.watertechsol;

import org.springframework.beans.BeansException;

import org.springframework.beans.factory.config.BeanFactoryPostProcessor;

import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

      @Override

      public void postProcessBeanFactory(ConfigurableListableBeanFactory arg0)

                  throws BeansException {

            System.out.println("My Bean factory post processor is called");  

      }

}

config.properties

pointA.pointX=0

pointA.pointY=10

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="org.yash.watertechsol.Triangle" autowire="byName">

      </bean>

     

      <bean id ="pointA" class="org.yash.watertechsol.Point">

            <property name="x" value="${pointA.pointX}" />

            <property name="y" value="${pointA.pointY}" />

      </bean>

     

      <bean id ="pointB" class="org.yash.watertechsol.Point">

            <property name="x" value="-20" />

            <property name="y" value="0" />

      </bean>

      <bean id ="pointC" class="org.yash.watertechsol.Point">

            <property name="x" value="0" />

            <property name="y" value="20" />

      </bean>    

      <bean class="org.yash.watertechsol.MyBeanFactoryPostProcessor" />

     

      <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

            <!-- relative path of file -->

            <property name="locations" value="config.properties"></property>

      </bean>

</beans>