1.构建一个maven工程:
http://projects.spring.io/spring-framework/#quick-start

javapackage com.spring;

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

public class Day01 {



    public static void main(String[] args) {


        ApplicationContext  ctx=new ClassPathXmlApplicationContext("beans.xml");
     HelloWorld obj = (HelloWorld) ctx.getBean("helloworld");
     System.out.println(obj);
    }

}

beans.xml在src/main/resource中间。
beans.xml的头可以参照
http://docs.spring.io/spring/docs/4.2.0.BUILD-SNAPSHOT/spring-framewor...

其中http://docs.spring.io/spring/docs/
列举出了所有的版本的reference
beans.xml:

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.xsd">
    <bean  id="helloworld" class="com.spring.HelloWorld">
    <property name="age" value="12"></property>
    <property name="name" value="tango"></property>
    </bean>
</beans>

<property>中间,name应该指的是方法名,而不是属性名,因为反射是根据方法名来注入的。
还有一种注入方式,就是可以将字面值写到<value>标签中:

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.xsd">
    <bean id="helloworld" class="com.spring.HelloWorld">
        <property name="age">
            <value>12</value>
        </property>
        <property name="name">
            <value>tango</value>            
        </property>
    </bean>
</beans>

happyfish
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