在父类中建立关系 (spring4.x以上版本)
package com.spring.annotation.generic; import org.springframework.beans.factory.annotation.Autowired; public class BaseService<T> { @Autowired private BaseRepository<T> dao; public void add(T entity){ System.out.println("add by " + dao); dao.save(entity); } } package com.spring.annotation.generic; public class BaseRepository<T> { public void save(T entity){ System.out.println("save:" + entity); } }
子类
package com.spring.annotation.generic; import org.springframework.stereotype.Service; @Service public class UserService extends BaseService<User>{ } package com.spring.annotation.generic; import org.springframework.stereotype.Repository; @Repository public class UserDao extends BaseRepository<User>{ }
测试
package com.spring.annotation.generic; 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-annotation.xml"); UserService userService = (UserService) ctx.getBean("userService"); userService.add(new User()); } }
结果
时间: 2024-10-05 22:20:44