11_注解03_用注解方式决定接口的实现类

【工程截图】



【Document.java】

package com.HigginCui.document.annotation;

public interface Document {
public void readDocument();
public void writeDocument();
}

【ExcelDocument.java】

package com.HigginCui.document.annotation;

import org.springframework.stereotype.Component;

@Component("excelDocument")
public class ExcelDocument implements Document{
@Override
public void readDocument() {
System.out.println("Excel read....");
}
@Override
public void writeDocument() {
System.out.println("Excel write....");
}
}

【PdfDocument.java】

package com.HigginCui.document.annotation;

import org.springframework.stereotype.Component;

@Component("pdfDocument")
public class PdfDocument implements Document{
@Override
public void readDocument() {
System.out.println("Pdf read....");
}
@Override
public void writeDocument() {
System.out.println("Pdf write....");
}
}

【WordDocument.java】

package com.HigginCui.document.annotation;

import org.springframework.stereotype.Component;

@Component("wordDocument")
public class WordDocument implements Document{
@Override
public void readDocument() {
System.out.println("Word read....");
}
@Override
public void writeDocument() {
System.out.println("Word write....");
}
}

【DocumentManager.java】

package com.HigginCui.document.annotation;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

@Component("documentManager")
public class DocumentManager {

@Resource(name="excelDocument")
private Document document;

public void read(){
this.document.readDocument();
}
public void write(){
this.document.writeDocument();
}
}

【applicationContext.xml】

<?xml version= "1.0" encoding ="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
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-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> 
<!-- 把一个类放入到Spring容器中，该类就是一个component，此时不需要声明对应的bean -->
<context:component-scan base-package="com.HigginCui.document.annotation"></context:component-scan>
</beans>

【testDocument.java】

package com.HigginCui.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.HigginCui.document.annotation.DocumentManager;

public class testDocument {
@Test
public void test(){
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
DocumentManager documentManager=(DocumentManager) context.getBean("documentManager");
documentManager.write();
documentManager.read();
}
}

【运行结果】

Excel write....
Excel read....