Spring学习（七）-泛型注入-优快云博客

本文介绍如何使用Spring框架实现带有泛型的依赖注入，并通过具体的Java代码实例展示整个过程。文章详细解释了如何配置Spring XML文件来扫描指定包下的组件，并展示了如何在带有泛型的基类中使用@Autowired注解来自动装配兼容类型的单个bean属性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

@Autowired注解自动装配具有兼容类型的单个bean属性

1.bean-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-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

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


</beans>

2.java文件

<!-- 定义带泛型的父类-->
package com.spring.generic.di;

public class BaseRepository <T>{

}


package com.spring.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);
    }


}


<!--继承集合泛型的子类-->
package com.spring.generic.di;

import org.springframework.stereotype.Repository;

@Repository
public class UserRepository extends BaseRepository<User> {

}


package com.spring.generic.di;

import org.springframework.stereotype.Service;

@Service
public class UserService extends BaseService<User> {

}


<!--泛型类-->

package com.spring.generic.di;

public class User {

}

<!--实现类-->

package com.spring.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("springXML/bean-generic-di.xml");

        UserService userService=(UserService)ctx.getBean("userService");
        userService.add();

    }

}