Spring实战之@Autowire注解用法详解

来源：本站原创|时间：2020-01-10|栏目：Java|点击：次

本文实例讲述了Spring实战之@Autowire注解用法。分享给大家供大家参考，具体如下：

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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