Spring实战之@Autowire注解用法详解

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

希望本文所述对大家java程序设计有所帮助。

来源：https://blog.csdn.net/chengqiuming/article/details/101172166