Spring 通过注解来读取和存储对象

ゝ一世哀愁。 2024-03-23 17:11 28阅读 0赞

#### 文章目录 ####

*   *  1.存储Bean对象
     *   *  1.1 前置工作: 配置扫描路径 (重要)
         *  1.2 添加注解存储Bean对象
     *  2. 获取Bean对象
     *   *  1.1三种注入方式
         *  1.2 两种注入方法
         *  2.1当 @Bean 将一个类型对象注入多次的问题
         *  2.2 解决方案

### 1.存储Bean对象 ###

之前的是需要再 spring-config.xml 下 导入bean的:

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#### 1.1 前置工作: 配置扫描路径 (重要) ####

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:content="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
        <content:component-scan base-package="com.beans"></content:component-scan>
    </beans>

在这里指定的是com.beans目录

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**也就是所有要存放到spring当中的bean,都要在这个目录下, 或者子目录下.**

#### 1.2 添加注解存储Bean对象 ####

**简单将 bean 存储到容器:**

a) 五大注解:

*  @Conroller \[控制器\]
    
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 *  @Service \[服务\]
    
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 *  @Repoistory \[仓库\]
    
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 *  @Configuration \[配置\]
    
    PS: 注意这里添加的注解是Configuration 而不是Configurable 否则会添加失败
    
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 *  @Component \[组件\]
    
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控制类端代码:

import com.beans.*;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    public class App {
        
        public static void main(String[] args) {
        
            //1.先得到上下文对象
            ApplicationContext context
                    = new ClassPathXmlApplicationContext("spring-config.xml");
            //2.得到bean
            UserController controller = context.getBean("userController", UserController.class);
            controller.sayHi();
            UserService service = context.getBean("userService", UserService.class);
            service.sayHello();
            UserRepository repository = context.getBean("userRepository",UserRepository.class);
            repository.sayHi();
            UserConfig config = context.getBean("userConfig",UserConfig.class);
            config.sayHi();
            UserComponent component = context.getBean("userComponent",UserComponent.class);
            component.sayHi();
        }
    }

运行结果如下:

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可以发现能够真正常运行, 那么, 如果**不加注解**会出现什么样的效果呢?

会出现**运行异常** `NoSuchBeanDefinitionException`错误信息

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如果Bean对象并不在扫描的路径 会出现什么样的效果呢?

其实是同样的异常 ,没有找到bean定义的对象 . 因此,指定**扫描路径**以及**添加注解**非常重要.

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此时还有一个问题:

五大注解都是能够添加Bean的, 那么他们的区别是什么?

为什么需要五大类注解?

**让代码可读性高, 让程序员能够直观判断当前类的用途**

*  Controller 负责和前端数据的校验控制
 *  Service 就是负责数据的组装和接口的调用
 *  Resository就是和数据库进行交互的层面, 也就是DAO层

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五大类注解的关系?

查看 Controller , Service , Respository ,Configuration 的源码:

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我们发现,@Controller ,@Service @Configuration @Responsitory 都是基于@Component注解实现的,

因此 @Component 是其他4个注解的父类.

--------------------

查看注解生成Bean name 的代码, 了解生成Bean name的机制

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b) 通过@Bean 方法

1.  创建一个User类
    
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2.  创建UserBeans类,用来存放User对象的方法
    
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    **PS: \*\* bean是添加到**方法**上的,并且**@Bean**注解是不能单独存在的,需要**五大注解\*\*的加持
3.  调用 **当Context对象通过bean name 获取到对象的时候 就已经调用了该方法.**
    
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    结果如下:
    
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    方法注解默认的Bean name 是 方法名, **但是也可以指定name(推荐)** , 此时通过方法名获取Bean name这个方法就会**失效**
    
    ![在这里插入图片描述][64e9847286614b2aaced813f3d8d3564.png]
    
    首先试着调用user1试试还会不会生效:
    
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    结果就是报错了 :
    
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    再使用指定的方法name 来获取Bean name :
    
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    结果如下:
    
    成功获取到当前Bean方法的user对象了
    
    ![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hn6g2cRo-1682314567110)(assets/image-20230422090931764.png)\]][img-hn6g2cRo-1682314567110_assets_image-20230422090931764.png]

### 2. 获取Bean对象 ###

获取bean对象也叫做**对象装配**,是把对象取出来放到某个类中, 有时候也叫对象注入

对象装配(对象注入)的实现方法以下三种:(注入的三种**方式**)

#### 1.1三种注入方式 ####

1.  属性注入(字段注入)
    
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2.  构造方法注入  
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3.  Setter注入
    
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属性注入,构造方法注入,setter注入的区别:

1.  属性注入特点是写法简单, 但是通用性不好, 它只能运行在Ioc容器下,如果是非Ioc容器就会出现问题(空指针异常)
2.  Setter注入: 早期Spring版本推荐Setter注入,Setter注入通用性没有构造方法注入通用.
3.  构造方法注入的好处:通用性更好,它能确保在注入对象之前, 此注入对象一定能被初始化,但是当注入方法注入参数过多时,此时开发者就需要检查自己写的代码是否符合单一设计原则的规范,此注入方式也是spring后期版本中推荐的注入方式.

#### 1.2 两种注入方法 ####

1.  @Resource
2.  @Aurowired

注入的两种**方法**的区别:

@Resource vs @Autowired

1.  出身不同: @Resource 来自于Jdk , @Autowried 时 Spring 框架提供的
2.  用法不同: @Autowired 支持属性注入,构造方法注入和Setter注入, 而 @Resource 不支持构造方法注入
3.  支持参数不同: @Resource 支持更多的参数设置,(name,type 设置…),而 @Autowired 只支持 required 参数

--------------------

#### 2.1当 @Bean 将一个类型对象注入多次的问题 ####

UserBeans类将对象User注入了两次:

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App类中:如

ApplicationContext context
                    = new ClassPathXmlApplicationContext("spring-config.xml");
    
            UserController controller = context.getBean("userController", UserController.class);
            controller.sayHi();

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此时就会报错: 也是因为 在UserController内部匹配到了两个User对象, 但是期望的时唯一一个

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#### 2.2 解决方案 ####

方案1: 直接指定变量名和bean name 相同

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方案2: 使用@Resource设置name / 使用@Autowired 搭配 @Qualifier value属性来指定注入对象:

*  使用@Resource设置name:
    
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![\* \[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ypmpS7Mw-1682314567113)(assets/image-20230422122408894.png)\]][_img-ypmpS7Mw-1682314567113_assets_image-20230422122408894.png]

运行结果 :

匹配成功

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