1.Spring IoC简单例子

Spring IoC简单例子

1.IHelloMessage.java

 package com.tony.spring.chapter01;

 public interface IHelloMessage {
     public String sayHello();
 }

2.HelloWorld.java

 package com.tony.spring.chapter01;

 public class HelloWorld implements IHelloMessage {

     @Override
     public String sayHello() {
         return "Hello everyone";
     }

 }

3.HelloChina.java

 package com.tony.spring.chapter01;

 public class HelloChina implements IHelloMessage {

     @Override
     public String sayHello() {
         return "大家好";
     }

 }

4.Person.java

 package com.tony.spring.chapter01;

 public class Person {

     private IHelloMessage helloMessage;

     public IHelloMessage getHelloMessage() {
         return helloMessage;
     }

     public void setHelloMessage(IHelloMessage helloMessage) {
         this.helloMessage = helloMessage;
     }

     public String sayHello(){
         return helloMessage.sayHello();
     }
 }

5.Main.java

 package com.tony.spring.chapter01;

 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.xml.XmlBeanFactory;
 import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;

 public class Main {

     public static void main(String[] args) {
         Resource r = new FileSystemResource("helloMessage.xml");
         BeanFactory f = new XmlBeanFactory(r);
         Person person = (Person)f.getBean("person");
         String s = person.sayHello();
         System.out.println("他说"+s);
     }

 }

6.helloMessage.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN"
 "http://www.springframework.org/dtd/spring-beans.dtd">
 <beans>
     <bean id="helloWorld" class="com.tony.spring.chapter01.HelloWorld"></bean>
     <bean id="helloChina" class="com.tony.spring.chapter01.HelloChina"></bean>
     <bean id="person" class="com.tony.spring.chapter01.Person">
         <!--<property name="helloMessage" ref="helloChina"/>-->
         <property name="helloMessage" ref="helloWorld"/>
     </bean>
 </beans>