[Spring] xml사용하기1

 

Calculator.java

package com.javalec.ex;

public class Calculator {
	
	public void addition(int firstNum, int secondNum) {
		System.out.println("addition()");
		int result = firstNum + secondNum;
		System.out.println(firstNum + " + " + secondNum + " = " + result);
	}

	public void subtraction(int firstNum, int secondNum) {
		System.out.println("subtraction()");
		int result = firstNum - secondNum;
		System.out.println(firstNum + " - " + secondNum + " = " + result);
	}

	public void multiplication(int firstNum, int secondNum) {
		System.out.println("multiplication()");
		int result = firstNum * secondNum;
		System.out.println(firstNum + " * " + secondNum + " = " + result);
	}

	public void division(int firstNum, int secondNum) {
		System.out.println("division()");
		int result = firstNum / secondNum;
		System.out.println(firstNum + " / " + secondNum + " = " + result);
	}
}

 

 

MyCalculator.java

package com.javalec.ex;

public class MyCalculator {

	Calculator calculator;
	private int firstNum;
	private int secondNum;
	
	public void add() {
		calculator.addition(firstNum, secondNum);
	}
	public void sub() {
		calculator.subtraction(firstNum, secondNum);
	}
	public void mul() {
		calculator.multiplication(firstNum, secondNum);
	}
	public void div() {
		calculator.division(firstNum, secondNum);
	}
	
	public void setCalculator(Calculator calculator) {
		this.calculator = calculator;
	}
	public void setFirstNum(int firstNum) {
		this.firstNum = firstNum;
	}
	public void setSecondNum(int secondNum) {
		this.secondNum = secondNum;
	}
	
}

 

 

MainClass.java

package com.javalec.ex;

import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;

import com.Ex01.MyInfo;

public class MainClass {

	public static void main(String[] args) {

		
		String configlocation = "classpath:applicationCTX.xml";
		AbstractApplicationContext ctx = new GenericXmlApplicationContext(configlocation);
		
		MyInfo myinfo = ctx.getBean("bmiCalculator", MyInfo.class);
		
		myinfo.getInfo();
		
	}

}

 

 

applicationCTX.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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

	<bean id="calculator2" class="com.javalec.ex.Calculator" />

	<bean id="myCalculator" class="com.javalec.ex.MyCalculator">
		<property name="calculator">
			<ref bean="calculator2" />
		</property>
		<property name="firstNum" value="10" />
		<property name="secondNum" value="2" />
	</bean>

</beans>

 

 

 

xml은 코드의 setter없이 자동으로 넣어준다.

JSP의 Beans와 java의 객체 주입 방식을 이해 했다면 쉽게 배울 수 있다.