1
스프링 어노테이션 예제를 다운로드했지만 삽입 할 클래스를 선택하는 방법을 볼 수없고 코드와 구성을 잘 알고 있습니다. (도시하지 않음)에 IWriter 인터페이스스프링 주석은 삽입 할 클래스를 어떻게 선택합니까?
package writers;
import org.springframework.stereotype.Service;
@Service
public class NiceWriter implements IWriter {
public void writer(String s) {
System.out.println("Nice Writer - " + s);
}
}
package writers;
import org.springframework.stereotype.Service;
@Service
public class Writer implements IWriter{
public void writer(String s) {
System.out.println("Writer - "+s);
}
}
package testbean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import writers.IWriter;
@Service
public class SpringBeanWithDI{
private IWriter writer;
@Autowired
public void setWriter(IWriter writer) {
this.writer = writer;
}
public void run() {
String s = "This is my test";
writer.writer(s);
}
}
테스트 빈의 구현 처음 몇 : -
package main;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import testbean.SpringBeanWithDI;
public class TestBean {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("META-INF/beans.xml");
BeanFactory factory = context;
SpringBeanWithDI test = (SpringBeanWithDI) factory.getBean("springBeanWithDI");
test.run();
}
}
과 beans.xml 환경 파일 : -
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:component-scan base-package="testbean" />
<context:component-scan base-package="Writers" />
</beans>
모든 매우 간단하지만 왜 항상 'Writer'구현을 주입합니까? documenation에서