泛型依赖注入

Spring 4.x的新特性

1.结构

BaseRepository.java：

package com.hk.beans.generic.di;

public class BaseRepository<T> {

}

BaseService.java：

package com.hk.beans.generic.di;

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

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

User.java：

package com.hk.beans.generic.di;

public class User {

}

UserRepository.java：

package com.hk.beans.generic.di;

import org.springframework.stereotype.Repository;

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

UserService.java：

package com.hk.beans.generic.di;

import org.springframework.stereotype.Service;

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

Main.java：

package com.hk.beans.generic.di;

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

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

}

运行结果：