IOC in Spring (1)

1. 什么是IOC的功能？
    * IoC       -- Inverse of Control，控制反转，将对象的创建权反转给Spring！！
    * 使用IOC可以解决的程序耦合性高的问题！！

2. 代码示例

 1 UserService:
 2 public interface UserService {
 3     public void sayHello();
 4 }
 5 
 6 UserServiceImpl:
 7 public class UserServiceImpl implements UserService {
 8 
 9     @Override
10     public void sayHello() {
11         System.out.println("Hello Spring");
12     }
13 
14 }
15 
16 Demo:
17 public class Demo {
18      
19      /** 
20       * Manual object creation
 21       */ 
22      @Test
 23      public  void run() {
 24          UserService us = new UserServiceImpl();
 25          us.sayHello();
 26      }
 27      
28      /** 
29       * IOC: Give the right to create objects to the Spring container
 30       */ 
31      @SuppressWarnings("resource" )
 32      @Test
 33      public  void run2() {
 34          // Create a factory and load the appliCationContext.xml configuration file 
35         ApplicationContext context = new ClassPathXmlApplicationContext("/config/spring-mvc.xml");
36         
37         // 获取对象
38         UserService us = (UserService) context.getBean("userService");
39         
40         us.sayHello();
41     }
42 }

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