SSM框架全套视频教程

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<groupId>com.atguigu</groupId>
<artifactId>maven_parent</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 新增一列打包方式packaging -->
<packaging>war</packaging>

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|-- pom.xml                               # Maven 项目管理文件 
|-- src
    |-- main                              # 项目主要代码
    |   |-- java                          # Java 源代码目录
    |   |   `-- com/example/myapp         # 开发者代码主目录
    |   |       |-- controller            # 存放 Controller 层代码的目录
    |   |       |-- service               # 存放 Service 层代码的目录
    |   |       |-- dao                   # 存放 DAO 层代码的目录
    |   |       `-- model                 # 存放数据模型的目录
    |   |-- resources                     # 资源目录，存放配置文件、静态资源等
    |   |   |-- log4j.properties          # 日志配置文件
    |   |   |-- spring-mybatis.xml        # Spring Mybatis 配置文件
    |   |   `-- static                    # 存放静态资源的目录
    |   |       |-- css                   # 存放 CSS 文件的目录
    |   |       |-- js                    # 存放 JavaScript 文件的目录
    |   |       `-- images                # 存放图片资源的目录
    |   `-- webapp                        # 存放 WEB 相关配置和资源
    |       |-- WEB-INF                   # 存放 WEB 应用配置文件
    |       |   |-- web.xml               # Web 应用的部署描述文件
    |       |   `-- classes               # 存放编译后的 class 文件
    |       `-- index.html                # Web 应用入口页面
    `-- test                              # 项目测试代码
        |-- java                          # 单元测试目录
        `-- resources                     # 测试资源目录

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<!-- 模型版本 -->
<modelVersion>4.0.0</modelVersion>
<!-- 公司或者组织的唯一标志，并且配置时生成的路径也是由此生成， 如com.companyname.project-group，maven会将该项目打成的jar包放本地路径：/com/companyname/project-group -->
<groupId>com.companyname.project-group</groupId>
<!-- 项目的唯一ID，一个groupId下面可能多个项目，就是靠artifactId来区分的 -->
<artifactId>project</artifactId>
<!-- 版本号 -->
<version>1.0.0</version>

<!--打包方式
    默认：jar
    jar指的是普通的java项目打包方式！ 项目打成jar包！
    war指的是web项目打包方式！项目打成war包！
    pom不会讲项目打包！这个项目作为父工程，被其他工程聚合或者继承！后面会讲解两个概念
-->
<packaging>jar/pom/war</packaging>

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<!-- 
   通过编写依赖jar包的gav必要属性，引入第三方依赖！
   scope属性是可选的，可以指定依赖生效范围！
   依赖信息查询方式：
      1. maven仓库信息官网 https://mvnrepository.com/
      2. mavensearch插件搜索
 -->
<dependencies>
    <!-- 引入具体的依赖包 -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
        <!--
            生效范围
            - compile ：main目录 test目录  打包打包 [默认]
            - provided：main目录 test目录  Servlet
            - runtime： 打包运行           MySQLj(反射)
            - test:    test目录           junit
         -->
        <scope>runtime</scope>
    </dependency>

</dependencies>

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<!--声明版本-->
<properties>
  <!--命名随便,内部制定版本号即可！-->
  <junit.version>4.11</junit.version>
  <!-- 也可以通过 maven规定的固定的key，配置maven的参数！如下配置编码格式！-->
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>

<dependencies>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <!--引用properties声明版本 -->
    <version>${junit.version}</version>
  </dependency>
</dependencies>

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<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.15.0</version>
</dependency>

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前提：
   A 1.1 -> B 1.1 -> C 1.1 
   F 2.2 -> B 2.2 
   
pom声明：
   F 2.2
   A 1.1 
   
   B 2.2 

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<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.2.8</version>
</dependency>

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使用记事本打开
set REPOSITORY_PATH=D:\repository  改成你本地仓库地址即可！
点击运行脚本，即可自动清理本地错误缓存文件！！

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打包: mvn clean package
重新编译: mvn clean compile
本地部署: mvn clean install 

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<build>
   <!-- jdk17 和 war包版本插件不匹配 -->
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.2</version>
        </plugin>
    </plugins>
</build>

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<groupId>com.atguigu.maven</groupId>
<artifactId>pro03-maven-parent</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 当前工程作为父工程，它要去管理子工程，所以打包方式必须是 pom -->
<!-- 父工程只用来管理，不需要写代码-->
<packaging>pom</packaging>

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<!-- 使用parent标签指定当前工程的父工程 -->
<parent>
  <!-- 父工程的坐标 -->
  <groupId>com.atguigu.maven</groupId>
  <artifactId>pro03-maven-parent</artifactId>
  <version>1.0-SNAPSHOT</version>
</parent>

<!-- 子工程的坐标 -->
<!-- 如果子工程坐标中的groupId和version与父工程一致，那么可以省略 -->
<!-- <groupId>com.atguigu.maven</groupId> -->
<artifactId>pro04-maven-module</artifactId>
<!-- <version>1.0-SNAPSHOT</version> -->

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<!-- 使用dependencyManagement标签配置对依赖的管理 -->
<!-- 被管理的依赖并没有真正被引入到工程 -->
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.0.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.0.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.0.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>4.0.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>4.0.0.RELEASE</version>
    </dependency>
  </dependencies>
</dependencyManagement>

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<!-- 子工程引用父工程中的依赖信息时，可以把版本号去掉。  -->
<!-- 把版本号去掉就表示子工程中这个依赖的版本由父工程决定。 -->
<!-- 具体来说是由父工程的dependencyManagement来决定。 -->
<dependencies>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-expression</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
  </dependency>
</dependencies>

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<project>
  <groupId>com.example</groupId>
  <artifactId>parent-project</artifactId>
  <packaging>pom</packaging>
  <version>1.0.0</version>
  <modules>
    <module>child-project1</module>
    <module>child-project2</module>
  </modules>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<!-- 此处要添加一些约束，配置文件的标签并不是随意命名 -->
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    https://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="..." [1] class="..." [2]>  
    <!-- collaborators and configuration for this bean go here -->
  </bean>

  <bean id="..." class="...">
    <!-- collaborators and configuration for this bean go here -->
  </bean>
  <!-- more bean definitions go here -->
</beans>

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//实例化ioc容器,读取外部配置文件,最终会在容器内进行ioc和di动作
ApplicationContext context = 
           new ClassPathXmlApplicationContext("services.xml", "daos.xml");

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//创建ioc容器对象，指定配置文件，ioc也开始实例组件对象
ApplicationContext context = new ClassPathXmlApplicationContext("services.xml", "daos.xml");
//获取ioc容器的组件对象
PetStoreService service = context.getBean("petStore", PetStoreService.class);
//使用组件对象
List<String> userList = service.getUsernameList();

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<dependencies>
    <!--spring context依赖-->
    <!--当你引入Spring Context依赖之后，表示将Spring的基础依赖引入了-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>6.0.6</version>
    </dependency>
    <!--junit5测试-->
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.3.1</version>
    </dependency>
</dependencies>

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package com.atguigu.ioc;


public class HappyComponent {

    //默认包含无参数构造函数

    public void doWork() {
        System.out.println("HappyComponent.doWork");
    }
}

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<!-- 实验一 [重要]创建bean -->
<bean id="happyComponent" class="com.atguigu.ioc.HappyComponent"/>

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public class ClientService {
  private static ClientService clientService = new ClientService();
  private ClientService() {}

  public static ClientService createInstance() {
  
    return clientService;
  }
}

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<bean id="clientService"
  class="examples.ClientService"
  factory-method="createInstance"/>

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public class DefaultServiceLocator {

  private static ClientServiceImpl clientService = new ClientServiceImpl();

  public ClientService createClientServiceInstance() {
    return clientService;
  }
}

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<!-- 将工厂类进行ioc配置 -->
<bean id="serviceLocator" class="examples.DefaultServiceLocator">
</bean>

<!-- 根据工厂对象的实例工厂方法进行实例化组件对象 -->
<bean id="clientService"
  factory-bean="serviceLocator"
  factory-method="createClientServiceInstance"/>

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public class UserDao {
}


public class UserService {
    
    private UserDao userDao;

    public UserService(UserDao userDao) {
        this.userDao = userDao;
    }
}

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<beans>
  <!-- 引用类bean声明 -->
  <bean id="userService" class="x.y.UserService">
   <!-- 构造函数引用 -->
    <constructor-arg ref="userDao"/>
  </bean>
  <!-- 被引用类bean声明 -->
  <bean id="userDao" class="x.y.UserDao"/>
</beans>

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public class UserDao {
}


public class UserService {
    
    private UserDao userDao;
    
    private int age;
    
    private String name;

    public UserService(int age , String name ,UserDao userDao) {
        this.userDao = userDao;
        this.age = age;
        this.name = name;
    }
}

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<!-- 场景1: 多参数，可以按照相应构造函数的顺序注入数据 -->
<beans>
  <bean id="userService" class="x.y.UserService">
    <!-- value直接注入基本类型值 -->
    <constructor-arg  value="18"/>
    <constructor-arg  value="赵伟风"/>
    
    <constructor-arg  ref="userDao"/>
  </bean>
  <!-- 被引用类bean声明 -->
  <bean id="userDao" class="x.y.UserDao"/>
</beans>


<!-- 场景2: 多参数，可以按照相应构造函数的名称注入数据 -->
<beans>
  <bean id="userService" class="x.y.UserService">
    <!-- value直接注入基本类型值 -->
    <constructor-arg name="name" value="赵伟风"/>
    <constructor-arg name="userDao" ref="userDao"/>
    <constructor-arg name="age"  value="18"/>
  </bean>
  <!-- 被引用类bean声明 -->
  <bean id="userDao" class="x.y.UserDao"/>
</beans>

<!-- 场景2: 多参数，可以按照相应构造函数的角标注入数据 
           index从0开始 构造函数(0,1,2....)
-->
<beans>
    <bean id="userService" class="x.y.UserService">
    <!-- value直接注入基本类型值 -->
    <constructor-arg index="1" value="赵伟风"/>
    <constructor-arg index="2" ref="userDao"/>
    <constructor-arg index="0"  value="18"/>
  </bean>
  <!-- 被引用类bean声明 -->
  <bean id="userDao" class="x.y.UserDao"/>
</beans>

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public Class MovieFinder{

}

public class SimpleMovieLister {

  private MovieFinder movieFinder;
  
  private String movieName;

  public void setMovieFinder(MovieFinder movieFinder) {
    this.movieFinder = movieFinder;
  }
  
  public void setMovieName(String movieName){
    this.movieName = movieName;
  }

  // business logic that actually uses the injected MovieFinder is omitted...
}

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<bean id="simpleMovieLister" class="examples.SimpleMovieLister">
  <!-- setter方法，注入movieFinder对象的标识id
       name = 属性名  ref = 引用bean的id值
   -->
  <property name="movieFinder" ref="movieFinder" />

  <!-- setter方法，注入基本数据类型movieName
       name = 属性名 value= 基本类型值
   -->
  <property name="movieName" value="消失的她"/>
</bean>

<bean id="movieFinder" class="examples.MovieFinder"/>

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//方式1:实例化并且指定配置文件
//参数：String...locations 传入一个或者多个配置文件
ApplicationContext context = 
           new ClassPathXmlApplicationContext("services.xml", "daos.xml");
           
//方式2:先实例化，再指定配置文件，最后刷新容器触发Bean实例化动作 [springmvc源码和contextLoadListener源码方式]  
ApplicationContext context = 
           new ClassPathXmlApplicationContext();   
//设置配置配置文件,方法参数为可变参数,可以设置一个或者多个配置
iocContainer1.setConfigLocations("services.xml", "daos.xml");
//后配置的文件,需要调用refresh方法,触发刷新配置
iocContainer1.refresh();           

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//方式1: 根据id获取
//没有指定类型,返回为Object,需要类型转化!
HappyComponent happyComponent = 
        (HappyComponent) iocContainer.getBean("bean的id标识");
          
//使用组件对象        
happyComponent.doWork();

//方式2: 根据类型获取
//根据类型获取,但是要求,同类型(当前类,或者之类,或者接口的实现类)只能有一个对象交给IoC容器管理
//配置两个或者以上出现: org.springframework.beans.factory.NoUniqueBeanDefinitionException 问题
HappyComponent happyComponent = iocContainer.getBean(HappyComponent.class);
happyComponent.doWork();

//方式3: 根据id和类型获取
HappyComponent happyComponent = iocContainer.getBean("bean的id标识", HappyComponent.class);
happyComponent.doWork();

根据类型来获取bean时，在满足bean唯一性的前提下，其实只是看：『对象 instanceof 指定的类型』的返回结果，
只要返回的是true就可以认定为和类型匹配，能够获取到。

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public class BeanOne {

  //周期方法要求： 方法命名随意，但是要求方法必须是 public void 无形参列表
  public void init() {
    // 初始化逻辑
  }
}

public class BeanTwo {

  public void cleanup() {
    // 释放资源逻辑
  }
}

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<beans>
  <bean id="beanOne" class="examples.BeanOne" init-method="init" />
  <bean id="beanTwo" class="examples.BeanTwo" destroy-method="cleanup" />
</beans>

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<!--bean的作用域 
    准备两个引用关系的组件类即可！！
-->
<!-- scope属性：取值singleton（默认值），bean在IOC容器中只有一个实例，IOC容器初始化时创建对象 -->
<!-- scope属性：取值prototype，bean在IOC容器中可以有多个实例，getBean()时创建对象 -->
<bean id="happyMachine8" scope="prototype" class="com.atguigu.ioc.HappyMachine">
    <property name="machineName" value="happyMachine"/>
</bean>

<bean id="happyComponent8" scope="singleton" class="com.atguigu.ioc.HappyComponent">
    <property name="componentName" value="happyComponent"/>
</bean>

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@Test
public void testExperiment08()  {
    ApplicationContext iocContainer = new ClassPathXmlApplicationContext("配置文件名");

    HappyMachine bean = iocContainer.getBean(HappyMachine.class);
    HappyMachine bean1 = iocContainer.getBean(HappyMachine.class);
    //多例对比 false
    System.out.println(bean == bean1);

    HappyComponent bean2 = iocContainer.getBean(HappyComponent.class);
    HappyComponent bean3 = iocContainer.getBean(HappyComponent.class);
    //单例对比 true
    System.out.println(bean2 == bean3);
}

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// 实现FactoryBean接口时需要指定泛型
// 泛型类型就是当前工厂要生产的对象的类型
public class HappyFactoryBean implements FactoryBean<HappyMachine> {
    
    private String machineName;
    
    public String getMachineName() {
        return machineName;
    }
    
    public void setMachineName(String machineName) {
        this.machineName = machineName;
    }
    
    @Override
    public HappyMachine getObject() throws Exception {
    
        // 方法内部模拟创建、设置一个对象的复杂过程
        HappyMachine happyMachine = new HappyMachine();
    
        happyMachine.setMachineName(this.machineName);
    
        return happyMachine;
    }
    
    @Override
    public Class<?> getObjectType() {
    
        // 返回要生产的对象的类型
        return HappyMachine.class;
    }
}

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<!-- FactoryBean机制 -->
<!-- 这个bean标签中class属性指定的是HappyFactoryBean，但是将来从这里获取的bean是HappyMachine对象 -->
<bean id="happyMachine7" class="com.atguigu.ioc.HappyFactoryBean">
    <!-- property标签仍然可以用来通过setXxx()方法给属性赋值 -->
    <property name="machineName" value="iceCreamMachine"/>
</bean>

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@Test
public void testExperiment07()  {

    ApplicationContext iocContainer = new ClassPathXmlApplicationContext("spring-bean-07.xml");

    //注意: 直接根据声明FactoryBean的id,获取的是getObject方法返回的对象
    HappyMachine happyMachine = iocContainer.getBean("happyMachine7",HappyMachine.class);
    System.out.println("happyMachine = " + happyMachine);

    //如果想要获取FactoryBean对象, 直接在id前添加&符号即可!  &happyMachine7 这是一种固定的约束
    Object bean = iocContainer.getBean("&happyMachine7");
    System.out.println("bean = " + bean);
}

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<dependencies>
    <!--spring context依赖-->
    <!--当你引入Spring Context依赖之后，表示将Spring的基础依赖引入了-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>6.0.6</version>
    </dependency>

    <!--junit5测试-->
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.3.1</version>
    </dependency>
</dependencies>

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/**
 * projectName: com.atguigu.components
 *
 * description: 普通的组件
 */
public class CommonComponent {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: controller类型组件
 */
public class XxxController {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: service类型组件
 */
public class XxxService {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: dao类型组件
 */
public class XxxDao {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: 普通的组件
 */
@Component
public class CommonComponent {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: controller类型组件
 */
@Controller
public class XxxController {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: service类型组件
 */
@Service
public class XxxService {
}

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/**
 * projectName: com.atguigu.components
 *
 * description: dao类型组件
 */
@Repository
public class XxxDao {
}

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<?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:context="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">
    <!-- 配置自动扫描的包 -->
    <!-- 1.包要精准,提高性能!
         2.会扫描指定的包和子包内容
         3.多个包可以使用,分割 例如: com.atguigu.controller,com.atguigu.service等
    -->
    <context:component-scan base-package="com.atguigu.components"/>
  
</beans>

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<!-- 情况三：指定不扫描的组件 -->
<context:component-scan base-package="com.atguigu.components">
    
    <!-- context:exclude-filter标签：指定排除规则 -->
    <!-- type属性：指定根据什么来进行排除，annotation取值表示根据注解来排除 -->
    <!-- expression属性：指定排除规则的表达式，对于注解来说指定全类名即可 -->
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

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<!-- 情况四：仅扫描指定的组件 -->
<!-- 仅扫描 = 关闭默认规则 + 追加规则 -->
<!-- use-default-filters属性：取值false表示关闭默认扫描规则 -->
<context:component-scan base-package="com.atguigu.ioc.components" use-default-filters="false">
    
    <!-- context:include-filter标签：指定在原有扫描规则的基础上追加的规则 -->
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

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@Controller(value = "tianDog")
public class SoldierController {
}

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@Service("smallDog")
public class SoldierService {
}

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public class BeanOne {

  //周期方法要求： 方法命名随意，但是要求方法必须是 public void 无形参列表
  @PostConstruct  //注解制指定初始化方法
  public void init() {
    // 初始化逻辑
  }
}

public class BeanTwo {
  
  @PreDestroy //注解指定销毁方法
  public void cleanup() {
    // 释放资源逻辑
  }
}

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@Scope(scopeName = ConfigurableBeanFactory.SCOPE_SINGLETON) //单例,默认值
@Scope(scopeName = ConfigurableBeanFactory.SCOPE_PROTOTYPE) //多例  二选一
public class BeanOne {

  //周期方法要求： 方法命名随意，但是要求方法必须是 public void 无形参列表
  @PostConstruct  //注解制指定初始化方法
  public void init() {
    // 初始化逻辑
  }
}

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import org.springframework.stereotype.Controller;

@Controller(value = "tianDog")
public class SoldierController {

    private SoldierService soldierService;

    public void getMessage() {
        soldierService.getMessage();
    }

}

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@Service("smallDog")
public class SoldierService {

    private SoldierDao soldierDao;

    public void getMessage() {
        soldierDao.getMessage();
    }
}

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@Repository
public class SoldierDao {

    public void getMessage() {
        System.out.print("I am a soldier");
    }

}

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@Controller(value = "tianDog")
public class SoldierController {
    
    @Autowired
    private SoldierService soldierService;
    
    public void getMessage() {
        soldierService.getMessage();
    }
    
}

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@Service("smallDog")
public class SoldierService {
    
    @Autowired
    private SoldierDao soldierDao;
    
    public void getMessage() {
        soldierDao.getMessage();
    }
}

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@Service("smallDog")
public class SoldierService {
    
    @Autowired
    private SoldierDao soldierDao;
    
    public void getMessage() {
        soldierDao.getMessage();
    }
}

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@Controller(value = "tianDog")
public class SoldierController {
    
    private SoldierService soldierService;
    
    @Autowired
    public SoldierController(SoldierService soldierService) {
        this.soldierService = soldierService;
    }
    ……

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@Controller(value = "tianDog")
public class SoldierController {

    private SoldierService soldierService;

    @Autowired
    public void setSoldierService(SoldierService soldierService) {
        this.soldierService = soldierService;
    }
    ……

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@Controller(value = "tianDog")
public class SoldierController {
    
    @Autowired
    @Qualifier(value = "maomiService222")
    // 根据面向接口编程思想，使用接口类型引入Service组件
    private ISoldierService soldierService;

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@Controller(value = "tianDog")
public class SoldierController {

    // 给@Autowired注解设置required = false属性表示：能装就装，装不上就不装
    @Autowired(required = false)
    private ISoldierService soldierService;

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<dependency>
    <groupId>jakarta.annotation</groupId>
    <artifactId>jakarta.annotation-api</artifactId>
    <version>2.1.1</version>
</dependency>

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@Controller
public class XxxController {
    /**
     * 1. 如果没有指定name,先根据属性名查找IoC中组件xxxService
     * 2. 如果没有指定name,并且属性名没有对应的组件,会根据属性类型查找
     * 3. 可以指定name名称查找!  @Resource(name='test') == @Autowired + @Qualifier(value='test')
     */
    @Resource
    private XxxService xxxService;

    //@Resource(name = "指定beanName")
    //private XxxService xxxService;

    public void show(){
        System.out.println("XxxController.show");
        xxxService.show();
    }
}

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catalog.name=MovieCatalog

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<!-- 引入外部配置文件-->
<context:property-placeholder location="application.properties" />

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package com.atguigu.components;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * projectName: com.atguigu.components
 *
 * description: 普通的组件
 */
@Component
public class CommonComponent {

    /**
     * 情况1: ${key} 取外部配置key对应的值!
     * 情况2: ${key:defaultValue} 没有key,可以给与默认值
     */
    @Value("${catalog:hahaha}")
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

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<?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:context="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">


    <!-- 配置自动扫描的包 -->
    <!-- 1.包要精准,提高性能!
         2.会扫描指定的包和子包内容
         3.多个包可以使用,分割 例如: com.atguigu.controller,com.atguigu.service等
    -->
    <context:component-scan base-package="com.atguigu.components"/>

    <!-- 引入外部配置文件-->
    <context:property-placeholder location="application.properties" />
</beans>

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 // xml方式配置文件使用ClassPathXmlApplicationContext容器读取
 ApplicationContext applicationContext =
                new ClassPathXmlApplicationContext("application.xml");

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import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

//标注当前类是配置类，替代application.xml    
@Configuration
//使用注解读取外部配置，替代 <context:property-placeholder标签
@PropertySource("classpath:application.properties")
//使用@ComponentScan注解,可以配置扫描包,替代<context:component-scan标签
@ComponentScan(basePackages = {"com.atguigu.components"})
public class MyConfiguration {
    
}

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// AnnotationConfigApplicationContext 根据配置类创建 IOC 容器对象
ApplicationContext iocContainerAnnotation = 
new AnnotationConfigApplicationContext(MyConfiguration.class);

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// AnnotationConfigApplicationContext-IOC容器对象
ApplicationContext iocContainerAnnotation = 
new AnnotationConfigApplicationContext();
//外部设置配置类
iocContainerAnnotation.register(MyConfiguration.class);
//刷新后方可生效！！
iocContainerAnnotation.refresh();

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<?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:context="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">


    <!-- 引入外部属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 实验六 [重要]给bean的属性赋值：引入外部属性文件 -->
    <bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

</beans>

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//标注当前类是配置类，替代application.xml    
@Configuration
//引入jdbc.properties文件
@PropertySource({"classpath:application.properties","classpath:jdbc.properties"})
@ComponentScan(basePackages = {"com.atguigu.components"})
public class MyConfiguration {

    //如果第三方类进行IoC管理,无法直接使用@Component相关注解
    //解决方案: xml方式可以使用<bean标签
    //解决方案: 配置类方式,可以使用方法返回值+@Bean注解
    @Bean
    public DataSource createDataSource(@Value("${jdbc.user}") String username,
                                       @Value("${jdbc.password}")String password,
                                       @Value("${jdbc.url}")String url,
                                       @Value("${jdbc.driver}")String driverClassName){
        //使用Java代码实例化
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setUrl(url);
        dataSource.setDriverClassName(driverClassName);
        //返回结果即可
        return dataSource;
    }
}

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public @interface Bean {
    //前两个注解可以指定Bean的标识
    @AliasFor("name")
    String[] value() default {};
    @AliasFor("value")
    String[] name() default {};
  
    //autowireCandidate 属性来指示该 Bean 是否候选用于自动装配。
    //autowireCandidate 属性默认值为 true，表示该 Bean 是一个默认的装配目标，
    //可被候选用于自动装配。如果将 autowireCandidate 属性设置为 false，则说明该 Bean 不是默认的装配目标，不会被候选用于自动装配。
    boolean autowireCandidate() default true;

    //指定初始化方法
    String initMethod() default "";
    //指定销毁方法
    String destroyMethod() default "(inferred)";
}