[Spring] 실습 4일차_@Resource

실습 4일차_@Resource

 

 

 

 Spring @Resource

MainClass.java

import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import com.dto.Cat;
import com.dto.Person;

public class MainClass {
	public static void main(String[] args) {
		
		// IoC Container
		ApplicationContext ctx = 
				new GenericXmlApplicationContext("classpath:com/config/test.xml");

		Person p1 = ctx.getBean("p1", Person.class);
		Cat c = p1.getCat();
		
		System.out.printf("이름:%s 나이:%s 주소:%s \n", p1.getUsername(), p1.getUserage(), p1.getAddress()); // printformat
		System.out.printf("고양이 이름:%s 나이:%s 성별:%s", c.getName(), c.getAge(), c.getSex());	
	}
}

Cat.java

package com.dto;
import org.springframework.beans.factory.annotation.Autowired;

public class Cat {
	String name;
	int age;
	String sex;
	
	public Cat() {

	}

	// 기본 생성자 안 만들고 인자있는 생성자 만듬
	public Cat(String name, int age, String sex) {
		super();
		this.name = name;
		this.age = age;
		this.sex = sex;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	@Override
	public String toString() {
		return "Cat [name=" + name + ", age=" + age + ", sex=" + sex + "]";
	}
	
}

Person.java

package com.dto;
import javax.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

public class Person {
	
	String username;
	int userage;
	String address;
	
	//@Autowired(required = false)
	//@Qualifier("cat1")
	@Resource(name = "cat2")
	Cat cat; // null
	
	public Person() {
	
	}

	// 기본 생성자 안 만들고 인자있는 생성자 만듬
	public Person(String username, int userage, String address, Cat cat) {
		super();
		this.username = username;
		this.userage = userage;
		this.address = address;
		this.cat = cat;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public int getUserage() {
		return userage;
	}

	public void setUserage(int userage) {
		this.userage = userage;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Cat getCat() {
		return cat;
	}

	public void setCat(Cat cat) {
		this.cat = cat;
	}

	@Override
	public String toString() {
		return "Person [username=" + username + ", userage=" + userage + ", address=" + address + ", cat=" + cat + "]";
	}
	
}

user.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.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<context:annotation-config />

	<bean id="cat1" class="com.dto.Cat"> <!-- 생성자로 주입  -->
		<property name="name" value="나비" />
		<property name="age" value="3" />
		<property name="sex" value="암컷" />
	</bean>
	
	<bean id="cat2" class="com.dto.Cat"> <!-- 생성자로 주입  -->
		<property name="name" value="나비2" />
		<property name="age" value="3" />
		<property name="sex" value="암컷" />
	</bean>
	
	<bean id="p1" class="com.dto.Person">
		<property name="username" value="고길동" />
		<property name="userage" value="30" />
		<property name="address" value="서울" />
		<!--  <property name="cat" ref="cat" /> 자동으로 주입  Cat.java @Autowired 코드 확인-->
	</bean>
</beans>

 

<!-- @ 어노테이션 활성화 -->
<context:annotation-config />

* context 활성화 방법

[Namespaces 탭] → [context] Check → Configure Namespaces 알림창 OK 버튼 마우스로 클릭 

 

 

 

* 출력 화면 

 

 출처

 

@Resource : 

+ 강의 교재