JSR: Java
specification request that defines all the standard annotations that applies
across different technologies and different frameworks. Spring support some of
the JSP annotations
@Resource(name=”pointC”) -> It points to bean name pointC
@Resource -> It points to type of setter or member
variable of class.
@PreConstruct -> It is used for pre initialization
@PostConstruct -> It is used for destroy where you can
add some clean up code.
DrawingApp.java
package org.yash.watertechsol;
import org.springframework.context.support.AbstractApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public class DrawingApp {
public static void main(String[]
args){
AbstractApplicationContext
context = new
ClassPathXmlApplicationContext("spring.xml");
context.registerShutdownHook();
Shape shape =
(Shape)context.getBean("circle");
shape.draw();
}
}
Triangle.java
package org.yash.watertechsol;
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("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;
}
}
Shape.java
package org.yash.watertechsol;
public interface Shape {
public void draw();
}
Circle.java
package org.yash.watertechsol;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
public class Circle implements Shape {
private Point center;
@Override
public void draw() {
System.out.println("Drawing
Circle");
System.out.println("("+center.getX()+", "+center.getY()+")");
}
public Point
getCenter() {
return center;
}
@Resource(name="pointC")
public void setCenter(Point
center) {
this.center = center;
}
@PostConstruct
public void initCircle(){
System.out.println("Init of
Circle");
}
@PreDestroy
public void
destroyCircle(){
System.out.println("Destroy of
Circle");
}
}
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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- <bean
id="triangle" class="org.yash.watertechsol.Triangle">
<property
name="pointA" ref="pointA"></property>
<property
name="pointB" ref="pointB"></property>
<property
name="pointC" ref="pointC"></property>
</bean> -->
<bean id="circle"
class="org.yash.watertechsol.Circle">
</bean>
<bean id
="pointA"
class="org.yash.watertechsol.Point">
<property name="x"
value="0" />
<property name="y"
value="0" />
</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>
<context:annotation-config />
</beans>
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