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XML방식을 Java Configuration방식으로 변경해보는 실습, Annotation을 활용함

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taesan
2019-12-30 15:45:46 +09:00
parent 8974b93f8f
commit 668a0ed7de
7 changed files with 152 additions and 35 deletions
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20
spring/di/ExamAppConfig.java Normal file
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@@ -0,0 +1,20 @@
package spring.di;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import spring.di.entity.Exam;
import spring.di.entity.NewlecExam;
@ComponentScan( { "spring.di.ui", "spring.di.entity" })
@Configuration
public class ExamAppConfig {
// 메소드 명이 bean id와같이 식별자 역할을 해준다.
@Bean
public Exam exam() {
return new NewlecExam();
}
}

26
spring/di/Program.java
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@@ -1,36 +1,20 @@
package spring.di;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import spring.di.entity.Exam;
import spring.di.entity.NewlecExam;
import spring.di.ui.ExamConsole;
public class Program {
public static void main(String[] args) {
//ExamConsole console = new InlineExamConsole(exam); // DI
//ExamConsole console = new GridExamConsole(exam);
/*
new InlineExamConsole(exam)
new FridExamConsole(exam)
같은 메서드를 호출하게되는 위 코드의 수정을 대신해줄 수 있도록 하는 기능이 Spring의 DI다.
*/
// 해당 클래스 사용하기위해서
// Maven 프로젝트로 바꿔서 빌드툴을 사용하도록 하였고
// Maven Repository에가서 Spring context를 dependency해주었음.
ApplicationContext context =
new ClassPathXmlApplicationContext("spring/di/setting.xml");
//new ClassPathXmlApplicationContext("spring/di/setting.xml");
new AnnotationConfigApplicationContext(ExamAppConfig.class);
//ExamConsole console = (ExamConsole)context.getBean("console");
ExamConsole console = context.getBean(ExamConsole.class);
//ExamConsole console = (ExamConsole)context.getBean("ExamConsole.class");
ExamConsole console = (ExamConsole)context.getBean("console");
console.print();

47
spring/di/constSetting.xml Normal file
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@@ -0,0 +1,47 @@
<?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:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
<!-- Exam exam = new NewlecExam(); -->
<bean id="exam" class="spring.di.entity.NewlecExam">
<constructor-arg type="int" name="kor" value="10" />
<constructor-arg type="int" name="eng" value="10" />
<constructor-arg type="int" name="math" value="10" />
<constructor-arg type="int" name="com" value="10" />
</bean>
<bean id="exam2" class="spring.di.entity.NewlecExam">
<constructor-arg type="int" name="kor" value="20" />
<constructor-arg type="int" name="eng" value="20" />
<constructor-arg type="int" name="math" value="20" />
<constructor-arg type="int" name="com" value="20" />
</bean>
<!-- ExamConsole console = new GridExamConsole(); -->
<bean id="console" class="spring.di.ui.InlineExamConsole">
<!-- console.setExam(exam); -->
<property name="exam" ref="exam" />
</bean>
<!-- 첫번째 방법, constructor-arg태그에 list태그 사용 -->
<bean id="exams" class="java.util.ArrayList">
<constructor-arg>
<list>
<ref bean="exam" />
<ref bean="exam2" />
</list>
</constructor-arg>
</bean>
<!-- 두번째 방법, util 네임스페이스를 사용해서 표현 -->
<util:list id="exams2" list-class="java.util.ArrayList">
<ref bean="exam" />
<ref bean="exam2" />
</util:list>
</beans>

19
spring/di/entity/NewlecExam.java
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@@ -7,16 +7,31 @@ public class NewlecExam implements Exam {
private int math;
private int com;
public NewlecExam() {
}
public NewlecExam(int kor, int eng, int math, int com) {
this.kor=kor;
this.eng=eng;
this.math=math;
this.com=com;
}
@Override
public int total() {
// TODO Auto-generated method stub
return kor+eng+math+com;
}
@Override
public float avg() {
// TODO Auto-generated method stub
return total() / 4.0f;
}
@Override
public String toString() {
return "NewlecExam [kor=" + kor + ", eng=" + eng + ", math=" + math + ", com=" + com + "]";
}
}

43
spring/di/entity/TaesanExam.java Normal file
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@@ -0,0 +1,43 @@
package spring.di.entity;
import org.springframework.beans.factory.annotation.Value;
public class TaesanExam implements Exam {
@Value("10")
private int kor;
@Value("20")
private int eng;
@Value("30")
private int math;
@Value("40")
private int com;
public TaesanExam() {
}
public TaesanExam(int kor, int eng, int math, int com) {
this.kor=kor;
this.eng=eng;
this.math=math;
this.com=com;
}
@Override
public int total() {
return kor+eng+math+com;
}
@Override
public float avg() {
return total() / 4.0f;
}
@Override
public String toString() {
return "NewlecExam [kor=" + kor + ", eng=" + eng + ", math=" + math + ", com=" + com + "]";
}
}

13
spring/di/setting.xml
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@@ -1,15 +1,10 @@
<?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">
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">
<!-- Exam exam = new NewlecExam(); -->
<bean id="exam" class="spring.di.entity.NewlecExam" />
<!-- ExamConsole console = new GridExamConsole(); -->
<bean id="console" class="spring.di.ui.InlineExamConsole">
<!-- console.setExam(exam); -->
<property name="exam" ref="exam" />
</bean>
<context:component-scan base-package="spring.di.ui, spring.di.entity" />
</beans>

19
spring/di/ui/InlineExamConsole.java
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@@ -1,21 +1,34 @@
package spring.di.ui;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import spring.di.entity.Exam;
@Component("console")
public class InlineExamConsole implements ExamConsole {
//@Qualifier("exam1")
@Autowired(required=false)
private Exam exam;
public InlineExamConsole() {
System.out.println("기본생성자");
}
public InlineExamConsole(Exam exam) {
this.exam = exam;
}
@Override
public void print() {
System.out.printf("total is %d, avg is %f\n", exam.total(), exam.avg());
if(exam != null ) {
System.out.println(" 현재 생성된 Exam 의 클래스는 ?? " + exam.getClass());
System.out.printf("total is %d, avg is %f\n", exam.total(), exam.avg());
}
else
System.out.println(" null 임다 ");
}
@Override