Spring Hello World

1.导入 需要的JAR包

　　spring-beans.4.0.0.RELEASE.jar

     spring-context-4.0.0

     spring-core-4.0.0

     spring-expression-4.0.0

     commons-logging-1.1.3.jar

 2.编写BEANS文件

 

这个配置文件的配置，可以从官方网站的spring-framework-reference 中的4.2.1小节中的 Configuration metadata中The following example shows the basic structure of XML-based configuration metadata:参考。

 

<?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.Helloworld">
        <property name="username" value="zhangsan"></property>
       
    </bean>

  <!--   <bean id="..." class="...">
        collaborators and configuration for this bean go here
    </bean>

    more bean definitions go here -->

</beans>

 3.编写 helloworld 类

package com.spring.helloworld;

public class Helloworld {
    
    private String username;

    public String getUsername() {
        return username;
    }

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

4.编写MAIN方法

package com.spring.main;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.helloworld.Helloworld;

public class TestSpring {

    public static void main(String[] args) {
        
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
    
        Helloworld helloWorld = (Helloworld) ctx.getBean("helloworld");
        
        helloWorld.hello();
        

    }

}

SPRING框架  

1.属性的值，注入到SPRING容器中

2.实例不需要NEW出来，从容器中取得实例对象，再通过实例调用相应的方法。

 

运行结果：hello:zhangsan