spring之泛型依赖注入
发布时间:2020-12-15 01:12:51 所属栏目:大数据 来源:网络整理
导读:目录结构: BaseRepository.java package com.gong.spring.beans.generic.di; public class BaseRepositoryT {} BaseService.java import org.springframework.beans.factory.annotation.Autowired; class BaseServiceT { @Autowired protected BaseReposito
目录结构: BaseRepository.java package com.gong.spring.beans.generic.di; public class BaseRepository<T> { } BaseService.java import org.springframework.beans.factory.annotation.Autowired; class BaseService<T> { @Autowired protected BaseRepository<T> repository; void add() { System.out.println("add.."); System.out.println(repository); } } User.java class User { } UserRepository.java org.springframework.stereotype.Repository; @Repository class UserRepository extends BaseRepository<User>{ } UserService.java org.springframework.stereotype.Service; @Service(value="userService") class UserService extends BaseService<User>{ } beans-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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"> context:component-scan base-package="com.gong.spring.beans.generic.di"></context:component-scan> </beans> Main.java org.springframework.context.ApplicationContext; org.springframework.context.support.ClassPathXmlApplicationContext; Main { static main(String[] args) { //1.创建spring的IOC容器对象 ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-generic.di.xml"); 2.从容器中获取Bean实例 UserService userService = (UserService) ctx.getBean("userService"); userService.add(); } } 输出: 说明:所谓泛型依赖注入,就是在父类建立了引用关系,子类继承父类也会建立这种引用关系,并且真正注入的是T对应的子类类型。? (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |