users 依赖注入 classpath app 输出 tor pro 4.3
主要讲泛型依赖注入,所以核心在 java 文件,配置文件中只需配置扫描包即可,如下:
- <?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-4.3.xsd">
- <context:component-scan base-package="spring.beans.generic.di"></context:component-scan>
- </beans>
- spring.beans.generic.di包中有两个配置的泛型的父类,有两个继承这两个父类的子类,还有一个实体bean,先看实体bean:由于只是模拟一下,没必要写属性,创建一个类即可。
- package spring.beans.generic.di;
- public class User {
- }
再看两个泛型的父类:
- package spring.beans.generic.di;
- public classBaseRepository {
- }
- package spring.beans.generic.di;
- import org.springframework.beans.factory.annotation.Autowired;
- public classBaseService {
- @Autowired
- protectedBaseRepository repository;
- public void add(){
- System.out.println("add...");
- System.out.println(repository);
- }
- }
子类:
- package spring.beans.generic.di;
- import org.springframework.stereotype.Repository;
- @Repository
- public classUserRepositoryextendsBaseRepository{
- }
- package spring.beans.generic.di;
- import org.springframework.stereotype.Service;
- @Service
- public classUserServiceextendsBaseService {
- }
测试:
- package spring.beans.generic.di.test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import spring.beans.generic.di.UserService;
- public class Main {
- public static void main(String[] args) {
- ApplicationContext ctx=newClassPathXmlApplicationContext("beans-generic-di.xml");
- UserService userService=(UserService) ctx.getBean("userService");
- userService.add();//输出的是子类的对象
- }
- }
输出:
- add...[email protected]
Spring 初学之泛型依赖注入
来源: http://www.bubuko.com/infodetail-2022417.html