结构：

HelloWorld.java：

package com.spring.test.helloWorld;public interface HelloWorld {        public void sayHello();     }

HelloWorldService.java：

package com.spring.test.helloWorld;public class HelloWorldService {          private HelloWorld helloWorld;      public HelloWorldService() {      }      public void setHelloWorld(HelloWorld helloWorld) {        this.helloWorld = helloWorld;    }      public HelloWorld getHelloWorld() {        return this.helloWorld;    }  }

SpringHelloWorld.java：

package com.spring.test.helloWorld.impl;import com.spring.test.helloWorld.HelloWorld;public class SpringHelloWorld implements HelloWorld {          @Override    public void sayHello() {        System.out.println("Spring Say Hello!!");    }  }

StrutsHelloWorld.java：

package com.spring.test.helloWorld.impl;import com.spring.test.helloWorld.HelloWorld;public class StrutsHelloWorld implements HelloWorld {          @Override    public void sayHello() {        System.out.println("Struts Say Hello!!");    }  }

beans.xml：

pom.xml

       
      
       4.0.0
        
      
       com.spring
        
      
       Spring
        
      
       0.0.1-SNAPSHOT
        
               
               
               
                   
        
         org.springframework
                    
        
         spring-core
                    
        
         4.1.4.RELEASE
                
                        
               
               
                   
        
         org.springframework
                    
        
         spring-context
                    
        
         4.1.4.RELEASE
                
         
      
     

HelloProgram.java：

package com.spring.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.spring.test.helloWorld.HelloWorld;import com.spring.test.helloWorld.HelloWorldService;public class HelloProgram {    public static void main(String[] args) {                ApplicationContext context =                new ClassPathXmlApplicationContext("beans.xml");//读取beans.xml 文件来创建一个应用程序上下文对象                 HelloWorldService service =             (HelloWorldService) context.getBean("helloWorldService");                  HelloWorld hw= service.getHelloWorld();                 hw.sayHello();    }}

运行HelloProgram.java

修改beans.xml：

运行HelloProgram.java：