#DI 설정 방법
오늘은 IOC컨테이너 안에 의존하는 객체인 DI를 설정하는 방법을 알아보자 !
총 3가지의 방법이 있다.
- DI in xml
- DI in java
- java 와 xml 같이 사용
###1. XML파일을 이용한 DI 설정 방법(DI in XML)
x// 일단 Student.java 파일 부터 보자package com.javalec.ex;import java.util.ArrayList;public class Student { private String name; private int age; private ArrayList<String> hobbys; private double height; private double weight; public Student(String name, int age, ArrayList<String> hobbys) { this.name = name; this.age = age; this.hobbys = hobbys; } public void setName(String name) { this.name = name; } public void setAge(int age) { this.age = age; } public void setHobbys(ArrayList<String> hobbys) { this.hobbys = hobbys; } public void setHeight(double height) { this.height = height; } public void setWeight(double weight) { this.weight = weight; } }===========================================================================================// 다음으로 Family.javapackage com.javalec.ex;public class Family { private String papaName; private String mamiName; private String sisterName; private String brotherName; public Family(String papaName,String mamiName) { this.papaName = papaName; this.mamiName = mamiName; } public String getPapaName() { return papaName; } public void setPapaName(String papaName) { this.papaName = papaName; } public String getMamiName() { return mamiName; } public void setMamiName(String mamiName) { this.mamiName = mamiName; } public String getSisterName() { return sisterName; } public void setSisterName(String sisterName) { this.sisterName = sisterName; } public String getBrotherName() { return brotherName; } public void setBrotherName(String brotherName) { this.brotherName = brotherName; }}===========================================================================================// 이렇게 두 .java 파일이 있을 때 DI설정 방법// 첫번째 !<?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.xsd"> <bean id="student1" class="com.javalec.ex.Student"> <constructor-arg value ="홍길동"/> <constructor-arg value ="27"/> <constructor-arg> <list> <value>게임</value> <value>산책</value> <value>운동</value> </list> </constructor-arg> <property name="height" value="172"/> <property name="weight" value="72"/> </bean> <bean id="studentInfo" class="com.javalec.ex.StudentInfo"> <property name="student"> <ref bean="student1"/> </property> </bean></beans>// constructor-age 는 생성자 에서 값을 넣을 때// property 는 setter를 이용해서 값을 넣을 때===========================================================================================// 두번쨰<?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:c="http://www.springframework.org/schema/c" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="student3" class="com.javalec.ex.Student"> <constructor-arg value ="홍홍홍"/> <constructor-arg value ="18"/> <constructor-arg> <list> <value>게임</value> <value>산책</value> <value>운동</value> </list> </constructor-arg> <property name="height" value="162"/> <property name="weight" value="50"/> </bean> <bean id ="family" class="com.javalec.ex.Family" c:papaName="홍아빠" c:mamiName="홍엄마" p:sisterName="홍스터"> <property name="brotherName" value="홍브라"></property> </bean> </beans>// 여기서 c(construct)와 p(property)라는 네임스페이스를 이용하고 싶으면// xmlns:c="http://www.springframework.org/schema/c"// xmlns:p="http://www.springframework.org/schema/p"// 이 두가지를 넣어주며 된다. 두 가지방법중 골라서 사용하면 된다.===========================================================================================// 마지막으로 MainClass.java 에서 어떻게 사용해야 하는지 보자!package com.javalec.ex;import org.springframework.context.support.AbstractApplicationContext;import org.springframework.context.support.GenericXmlApplicationContext;public class MainClass { public static void main(String[] args) { String configLog1 = "classpath:applicationCTX.xml"; String configLog2 = "classpath:applicationCTX1.xml"; //IOC 컨테이너에 두개의 컴포넌트를 삽입 AbstractApplicationContext ctx = new GenericXmlApplicationContext(configLog1, configLog2); Student student1 = ctx.getBean("student1", Student.class); System.out.println(student1.getName()); System.out.println(student1.getHobbys()); // studentInfo 클래스의 getStudent를 이용하여 어떤것을 참조하는지 확인할 것(applicationCTX.xml에서!) StudentInfo studentInfo = ctx.getBean("studentInfo", StudentInfo.class); Student student2 = studentInfo.getStudent(); System.out.println(student2.getName()); System.out.println(student2.getHobbys()); if(student1.equals(student2)) { System.out.println("student1 == student2"); } Student student3 = ctx.getBean("student3", Student.class); if(student1.equals(student3)) { System.out.println("student1 == student3"); } else { System.out.println("student1 != student3"); } Family family = ctx.getBean("family", Family.class); System.out.println(family.getPapaName()); System.out.println(family.getMamiName()); System.out.println(family.getSisterName()); System.out.println(family.getBrotherName()); ctx.close(); }}======결과======홍길동[게임, 산책, 운동]홍길동[게임, 산책, 운동]student1 == student2student1 != student3홍아빠홍엄마홍스터홍브라====================================================================================// StudentInfo 클래스를 깜빡했는데, 위에 결과가 나오기 위해선 getStudent()가 어떻게 작동하는지// applicationCTX.xml 과 잘 생각하여 확인 !package com.javalec.ex;public class StudentInfo { Student student; public StudentInfo() { } public void setStudent(Student student) { this.student = student; } public Student getStudent() { return student; }}
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