@Autowire注解怎么在Spring中使用?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
一 配置
<?xml version="1.0" encoding="GBK"?> <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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <context:component-scan base-package="org.crazyit.app.service,org.crazyit.app.dao"/> </beans>
二 dao接口
BaseDao
package org.crazyit.app.dao; public interface BaseDao<T> { void save(T e); }
ItemDao
package org.crazyit.app.dao; import org.crazyit.app.domain.*; public interface ItemDao extends BaseDao<Item> { }
UserDao
package org.crazyit.app.dao; import org.crazyit.app.domain.*; public interface UserDao extends BaseDao<User> { }
三 dao实现类
BaseDaoImpl
package org.crazyit.app.dao.impl; import org.crazyit.app.dao.*; public class BaseDaoImpl<T> implements BaseDao<T> { public void save(T e) { System.out.println("程序保存对象:" + e); } }
ItemDaoImpl
package org.crazyit.app.dao.impl; import org.springframework.stereotype.*; import org.crazyit.app.dao.*; import org.crazyit.app.domain.*; @Component("itemDao") public class ItemDaoImpl extends BaseDaoImpl<Item> implements ItemDao { }
UserDaoImpl
package org.crazyit.app.dao.impl; import org.springframework.stereotype.*; import org.crazyit.app.dao.*; import org.crazyit.app.domain.*; @Component("userDao") public class UserDaoImpl extends BaseDaoImpl<User> implements UserDao { }
四 Bean
Item
package org.crazyit.app.domain; public class Item { }
User
package org.crazyit.app.domain; public class User { }
五 service接口
BaseService
package org.crazyit.app.service; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.service.*; public interface BaseService<T> { void addEntity(T entity); }
ItemService
package org.crazyit.app.service; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.service.*; import org.crazyit.app.domain.*; @Component public interface ItemService extends BaseService<Item> { }
UserService
package org.crazyit.app.service; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.service.*; import org.crazyit.app.domain.*; @Component public interface UserService extends BaseService<User> { }
六 Service实现类
BaseServiceImpl
package org.crazyit.app.service.impl; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.dao.*; import org.crazyit.app.service.*; public class BaseServiceImpl<T> implements BaseService<T> { @Autowired private BaseDao<T> dao; public void addEntity(T entity) { System.out.println("调用" + dao + "保存实体:" + entity); } }
ItemServiceImpl
package org.crazyit.app.service.impl; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.service.*; import org.crazyit.app.domain.*; @Component("itemService") public class ItemServiceImpl extends BaseServiceImpl<Item> implements ItemService { }
UserServiceImpl
package org.crazyit.app.service.impl; import org.springframework.stereotype.*; import org.springframework.beans.factory.annotation.*; import org.crazyit.app.service.*; import org.crazyit.app.domain.*; @Component("userService") public class UserServiceImpl extends BaseServiceImpl<User> implements UserService { }
七 测试类
package lee; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.crazyit.app.service.*; import org.crazyit.app.domain.*; public class BeanTest { public static void main(String[] args)throws Exception { // 创建Spring容器 ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); UserService us = ctx.getBean("userService", UserService.class); us.addEntity(new User()); ItemService is = ctx.getBean("itemService", ItemService.class); is.addEntity(new Item()); } }
八 测试
调用org.crazyit.app.dao.impl.UserDaoImpl@b7dd107保存实体:org.crazyit.app.domain.User@42eca56e调用org.crazyit.app.dao.impl.ItemDaoImpl@52f759d7保存实体:org.crazyit.app.domain.Item@7cbd213e
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