项目创建

Spring Boot 项目创建的方式：
1、通过启动器创建、下载、导入：

• 官方启动器：https://start.spring.io/
• 阿里云启动器：https://start.aliyun.com/

2、通过 idea 继承的工具创建：利用的是上述两个网站的启动器创建项目

Spring Boot 项目依赖管理：
1、继承 spring-boot-starter-parent：父项目提供了良好的依赖管理，资源过滤和插件配置，同时可以根据需要使用 properties 覆盖其提供的内部依赖

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.4.0</version>
  <relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
  <!-- 必要时可以通过在此处设置版本号覆盖默认版本 -->
  <java.version>1.8</java.version>
</properties>
<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
  </dependency>
</dependencies>
<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
  </plugins>
</build>

2、导入 spring-boot-dependencies
父项目：

<packaging>pom</packaging>
<properties>
  <java.version>1.8</java.version>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <spring-boot.version>2.3.4.RELEASE</spring-boot.version>
</properties>
<dependencyManagement>
  <dependencies>
    <!-- 不支持通过properties属性进行版本覆盖 -->
    <!-- 需要进行版本覆盖时，需要在springboot依赖前引入相应的maven依赖 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>${spring-boot.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>
<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.8.1</version>
      <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <encoding>UTF-8</encoding>
      </configuration>
    </plugin>
  </plugins>
</build>

模块：

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
    <exclusions>
      <exclusion>
        <groupId>org.junit.vintage</groupId>
        <artifactId>junit-vintage-engine</artifactId>
      </exclusion>
    </exclusions>
  </dependency>
</dependencies>
<build>
  <plugins>   
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <version>2.3.4.RELEASE</version>
      <configuration>
        <!--主配置类 -->
        <mainClass>com.example.demo.DemoApplication</mainClass>
      </configuration>
      <executions>
        <execution>
          <id>repackage</id>
          <goals>
            <goal>repackage</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>