1. 创建一个Maven的项目，我的项目结构如下：
   
2. 在pom文件里写下需要导入的依赖：

    <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.abc</groupId><artifactId>01-first(Spring)</artifactId><version>1.0-SNAPSHOT</version><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>6</source><target>6</target></configuration></plugin></plugins></build><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>10</maven.compiler.source><maven.compiler.target>10</maven.compiler.target><spring.version>5.1.0.RELEASE</spring.version></properties><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-expression</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jcl</artifactId><version>${spring.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency></dependencies><build><plugins><plugin><artifactId>maven-compiler-plugin</artifactId><configuration><source>1.10</source><target>1.10</target></configuration></plugin></plugins></build></project>

1. 在Java文件夹下新建package，在package包下新建接口及其实现类
   接口：
   public interface SomeService { void doSome(); }
   实现类：

       public class SomeServiceImpl implements SomeService {public SomeServiceImpl() {System.out.println("创建SomeServiceImpl对象");}@Overridepublic void doSome() {System.out.println("执行SomeServiceImpl里的doSome()方法");}}

2. 在resources目录下新建applicationContext.xml文件

• 我们需要在spring容器的配置文件中进行注册该Bean

• spring使用的配置文件为xml文件，当然需要引入约束文件，一般将spring的配置文件命名为applicationContext.xml

   <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd">    <!--注册Servcie其造价于如下代码：   SomeServiceImpl someService = new SomeServiceImpl();其底层是通过反射机制创建的someService对象Object someService = Class.forName("com.abc.service.SomeServiceImpl").newInstance();--><bean id="someService" class="com.abc.service.SomeServiceImpl"/></beans>

• spring的根元素是benas显然是注册Bean，子标签是Bean
• 注册:<bean id="someService" class="com.abc.service.SomeServiceImpl"/>
• id属性为了唯一确定一个对象，class属性里边应写类全名

1. 注册完毕后我们要在测试类中获取spring容器,而获取Spring容器有两种方式。

    package com.abc.service;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.context.support.FileSystemXmlApplicationContext;public class SomeServiceImplTTest {// spring容器获取的两种方式@Testpublic void test01(){//在类路径下加载Spring配置文件ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");//在当前目录的根下加载该配置文件,路径应为文件实际存放的目录ApplicationContext ac2 = new FileSystemXmlApplicationContext("D:\\IDEA-workspace\\01-first(Spring)\\src\\main\\resources\\applicationContext.xml");System.out.println(ac2);}    @Testpublic void test02() {// 加载Spring配置文件，创建Spring容器对象ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");//调用spring容器的getBean方法获取carImpl，方法参数为bean的idSomeService service = (SomeService) ac.getBean("SomeService");service.doSome();}}

Spring入门程序到此就结束了