使用Maven创建一个简单的SpringBoot 项目

工具：IDEA 代码编辑器

1、使用IDEA创建一个Maven项目

2、编辑pom.xml

 <!-- 使工程变成Spring Boot 应用 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>

    <dependencies>
        <!-- 引入Web应用 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.5.RELEASE</version>
        </dependency>

    </dependencies>

3 、更换Maven的镜像，改为国内镜像，以免等待下载依赖的时间过长。

创建 settings.xml 文件（通常是没有这个文件的，编辑好之后记得在IDEA中要选 override）

liuchangping-deMacBook-Pro:.m2 Ricky$ vim settings.xml
liuchangping-deMacBook-Pro:.m2 Ricky$ cat settings.xml 
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                          https://maven.apache.org/xsd/settings-1.0.0.xsd">

      <mirrors>
        <mirror>  
            <id>alimaven</id>  
            <name>aliyun maven</name>  
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>  
            <mirrorOf>central</mirrorOf>          
        </mirror>  
      </mirrors>
</settings>
liuchangping-deMacBook-Pro:.m2 Ricky$ pwd
/Users/ricky/.m2
liuchangping-deMacBook-Pro:.m2 Ricky$

4 、创建Spring Boot应用类

 1 package cn.longmiss.sample;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 
 6 @SpringBootApplication
 7 public class Ch1Application {
 8     public static void main(String[] args){
 9 
10         SpringApplication.run(Ch1Application.class,args);
11     }
12 }

5、创建Controller

 1 import org.springframework.stereotype.Controller;
 2 import org.springframework.web.bind.annotation.RequestMapping;
 3 import org.springframework.web.bind.annotation.ResponseBody;
 4 
 5 @Controller
 6 public class HelloWorldController {
 7 
 8     @RequestMapping("/say.html")
 9     public @ResponseBody String say(){
10         return "Hello Spring Boot";
11     }
12 
13 }