Spring中@Autowire注解如何使用,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.*;@Componentpublic 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.*;@Componentpublic 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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