Spring新特性_泛型依赖注入

泛型依赖注入

package com.tanlei.spring.generic;

import org.springframework.beans.factory.annotation.Autowired;

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

package com.tanlei.spring.generic;

import org.springframework.stereotype.Service;

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

package com.tanlei.spring.generic;

public class BaseRepository<T> {

}

package com.tanlei.spring.generic;

import org.springframework.stereotype.Repository;

@Repository
public class UserReopsitory extends BaseRepository<User>{
    
}

package com.tanlei.spring.generic;

public class User {

}

<?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-4.0.xsd">

    <context:component-scan base-package="com.tanlei.spring.generic"></context:component-scan>
</beans>

package com.tanlei.spring.generic;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
   public static void main(String[] args) {
    ApplicationContext context=new ClassPathXmlApplicationContext("bean.generic.xml");
    UserService userService=(UserService) context.getBean("userService");
    userService.add();
}
}