Spring_泛型依赖注入
Spring 4.x 中可以为子类注入子类对应的泛型类型的成员变量的引用
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:p="http://www.springframework.org/schema/p" 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-4.0.xsd"> <context:component-scan base-package="com.aff.spring.beans.generic.di"></context:component-scan> </beans>
Main
package com.aff.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-di.xml"); UserService userService = (UserService) ctx.getBean("userService"); userService.add(); //add.. //com.aff.spring.beans.generic.di.UserRepository@3234e239 } }
BaseRepository.java
package com.aff.spring.beans.generic.di; public class BaseRepository<T> { }
BaseService.java
package com.aff.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); } }
UserRepository.java
package com.aff.spring.beans.generic.di; import org.springframework.stereotype.Repository; @Repository public class UserRepository extends BaseRepository<User>{ }
UserService.java
package com.aff.spring.beans.generic.di; import org.springframework.stereotype.Service; @Service public class UserService extends BaseService<User> { }
User
package com.aff.spring.beans.generic.di; public class User { }
All that work will definitely pay off