Spring入门学习（泛型依赖注入） 第十三节

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Spring4泛型依赖注入

1. 创建泛型类BaseRepository<T>，BaseService<T>，BaseService中注入了BaseRepository<T>类的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. 创建User类，UserService类，UserRepository类，并添加注解：

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

3. 创建一个bean配置文件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. 创建测试类：

   
   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();
   	}
   }
   

   测试结果：

   BaseRepository add....
   com.fafa.spring.beans.generic.di.UserRepository@1a722605
   

   此时baseRepository的bean是一个UserRepository的bean