spring ico

代码非常简单。如果缺少jar包将导致报错。

需要5个spring jar包和1个logging jar，否则报错。 

org.springframework.asm.jar
org.springframework.core.jar
org.springframework.beans.jar
org.springframework.context.jar
org.springframework.expression.jar

定义一个接口，一个实现类。java project项目。

package ioc;
public interface HelloApi {
    public void sayHello();  
}

package ioc;
public class Hello implements HelloApi{
    @Override
    public void sayHello() {  
        System.out.println("Hello World!");  
 } 
}

package ioc;

import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
public class HelloTest {    
    public static  void main(String[] args) {  
        ApplicationContext context = new ClassPathXmlApplicationContext("helloworld.xml");  
         HelloApi helloApi = context.getBean("hello", HelloApi.class);  
         helloApi.sayHello();         
  }  
}

　　

<?xml version="1.0" encoding="UTF-8"?>  
<beans  
xmlns="http://www.springframework.org/schema/beans"  
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xmlns:context="http://www.springframework.org/schema/context"  
xsi:schemaLocation="  
http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
http://www.springframework.org/schema/context                http://www.springframework.org/schema/context/spring-context-3.0.xsd">  
  <!-- id 表示你这个组件的名字，class表示组件类 -->  
<bean id="hello" class="ioc.Hello"></bean>  
</beans> 

 不清楚如何找到该xml文件。

 ApplicationContext context = new ClassPathXmlApplicationContext("helloworld.xml");