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@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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