@Autowired註解自動 裝配具有相容型別的單個bean屬性

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檔案

<!-- 定義帶泛型的父類-->
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);
    }


}


<!--繼承集合泛型的子類-->
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> {

}


<!--泛型類-->

package com.spring.generic.di;

public class User {

}

<!--實現類-->

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();

    }

}