spring IoC编程实例

配置文件

/SpringHelloWorld/src/applicationContext.xml

<?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-2.0.xsd">
    
    <bean id="greetingService" class="com.qdu.sun.spring.HelloWorld">
        <constructor-arg>
            <value type="java.lang.String">Welcome!</value>
        </constructor-arg>
    </bean></beans>

SpringTest.java

package com.qdu.sun.spring;

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

public class SpringTest {
     public static void main( String[] args ){
            BeanFactory factory = new XmlBeanFactory( new ClassPathResource("applicationContext.xml") );
            HelloWorld gc = (HelloWorld)factory.getBean("greetingService");
            gc.sayGreeting();
        }
}

HelloWorld.java

package com.qdu.sun.spring;

public class HelloWorld {
private String greeting;
    
    public HelloWorld(){
        
    }
    
    public HelloWorld( String greeting ){
        this.greeting = greeting;
    }
    
    public void sayGreeting(){
        System.out.println( greeting );
    }
    
    public void setGreeting( String greeting ){
        this.greeting = greeting;
    }

}