Spring入門學習（泛型依賴注入）

• Spring4泛型依賴注入

Spring4泛型依賴注入

1. 建立泛型類BaseRepository<T>，BaseService<T>，BaseService中注入了BaseRepository<T>類的bean

   public class BaseRepository<T> {
   
   }
   

   public class BaseService<T> {
   
   	@Autowired
   	private BaseRepository<T> baseRepository;
    
   
   	
   	public void add() {
   		System.out.println("BaseRepository add....");
   		System.out.println(baseRepository);
   	}
   }
   

2. 建立User類，UserService類，UserRepository類，並添加註解：

   public class User {
   
   }
   
   @Service
   public class UserService extends BaseService<User> {
   	
   }
   
   @Repository
   public class UserRepository extends
    
    BaseRepository<User> {
   
   }
   

3. 建立一個bean配置檔案beans-generic-di.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"
   	xmlns:context="http://www.springframework.org/schema/context"
   	xsi:schemaLocation=
    
   "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
   		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
   
   	<context:component-scan base-package="com.fafa.spring.beans.generic.di"></context:component-scan>
   
   </beans>
   

4. 建立測試類：

   
   public class Main {
   	
   	public static void main(String[] args) {
   		ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath*:beans-generic-di.xml");
   		
   		UserService userService = (UserService) ctx.getBean("userService");
   		userService.add();
   	}
   }
   

   測試結果：

   BaseRepository add....
   [email protected]
   

   此時baseRepository的bean是一個UserRepository的bean