小试牛刀 spring的HelloWorld

先导入包：

commons-logging-1.1.1.jar  ： spring依赖的包；

spring-beans-4.0.0.RELEASE.jar；

spring-context-4.0.0.RELEASE.jar；

spring-core-4.0.0.RELEASE.jar；

spring-expression-4.0.0.RELEASE.jar；

package com.model;

public class HelloWorld {

    private String username;

    public void setUsername(String username) {
        this.username = username;
    }
    
    public void hello(){
        System.out.println("hello:"+username);
    }
    
}

<?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="hello" class="com.model.HelloWorld">
        <property name="username" value="spring4"></property>
    </bean>


</beans>

package com.model;

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

public class Main {

    public static void main(String[] args) {
        //获取spring的IOC容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("hello.xml");
        
        //从容器中获取bean；hello对于xml文件中bean的id
        HelloWorld helloWorld = (HelloWorld) ac.getBean("hello");
        System.out.println(helloWorld);
        //调用方法
        helloWorld.hello();
    }
    
}

打印结果：

十二月 06, 2014 9:51:47 上午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1642bd6: startup date [Sat Dec 06 09:51:47 CST 2014]; root of context hierarchy
十二月 06, 2014 9:51:47 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [hello.xml]
com.model.HelloWorld@154ab89
hello:spring4