建立一个Hello World级别的Spring项目

package com.sevenhu.domain;

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

/**
 * Created by hu on 2016/3/31.
 */
public class HelloWorld {
    private String userName;

    //Spring项目中，配置在容器中的类，其属性都必须有setter方法
    public void setUserName(String userName) {
        this.userName=userName;
    }
    public void hello(){
        System.out.println("Hello: "+userName);
    }
    public static void main(String[] args){
        //1.创建Spring的IOC容器
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("beans.xml");
       //2.从容器中获取bean
        HelloWorld helloWorld= (HelloWorld) applicationContext.getBean("helloWorld");
        System.out.println(helloWorld);
        //3.调用方法
        helloWorld.hello();
    }
}

　　Spring的配置文件的代码如下：

<?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.xsd">

       <bean id="helloWorld" class="com.sevenhu.domain.HelloWorld">
              <property name="userName" value="Spring"></property>
       </bean>
</beans>