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>