spring_(14)泛型依赖注入

• Spring4.x中可以为子类对应的泛型类型的成员变量的引用

例子程序

基本结构

BaseRepository.java

package com.spring.beans.generic.di;

public class BaseRepository<T> {
}

BaseService.java

package com.spring.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.spring.beans.generic.di;

public class User {
}

UserRepository.java

package com.spring.beans.generic.di;

import org.springframework.stereotype.Repository;

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

UserService.java

package com.spring.beans.generic.di;

import org.springframework.stereotype.Service;

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

beans-generic.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.xsd">

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


</beans>

Main.java

package com.spring.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.xml");

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

}

运行结果