使用Maven创建基础的springboot项目

安装Maven 3.3.9
安装链接：https://mirrors.bfsu.edu.cn/apache/maven/maven-3/
解压到D:\apache-maven-3.3.9-bin
环境变量的配置：
```
path %M2_HOME%\bin
M2_HOME D:\apache-maven-3.3.9-bin\apache-maven-3.3.9
```
cmd 输入mvn -vyan

配置Maven
D:\apache-maven-3.3.9-bin\apache-maven-3.3.9\conf\settings.xml
使用阿里云下载路径

<mirror>
         <id>alimaven</id>
         <mirrorOf>central</mirrorOf>
         <name>aliyun maven</name>
         <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
</mirror>

设置仓库位置

<localRepository>D:\Maven-Repository</localRepository>

Eclipse配置Maven
设置MAVEN路径
菜单->Window->Preferences->Maven->Installations-> 指定
```
D:\apache-maven-3.3.9-bin\apache-maven-3.3.9
```
设置仓库路径
菜单->Window->Preferences->Maven->User Settings->
Global Settings 和 User Settings都使用：
```
D:\apache-maven-3.3.9-bin\apache-maven-3.3.9\conf\settings.xml
```
点击一下Reindex,确保 local Repository为：
```
D:\Maven-Repository
```

Eclipse创建Springboot项目
菜单 -> File -> New -> Other -> Maven -> Maven -> Maven Project -> New Maven Project
勾上 Create a simple project (skip archetype selection)

groupId：com.java
artifactId：springboot
name：springboot
description：springboot

修改pom.xml，右键点击项目->Maven->Update Project 更新一下项目

<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.java</groupId>
<artifactId>springboot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot</name>
<description>springboot</description>
<!--   <！-从Spring Boot继承默认值->  -->
<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.0.0.RELEASE</version>
 <relativePath />
</parent>
<!--   <！-为Web应用程序添加典型的依赖关系->  -->
<dependencies>
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
     <version>3.8.1</version>
     <scope>test</scope>
  </dependency>
</dependencies>

 <properties>
     <java.version>1.8</java.version>
 </properties>
<!--  <！-打包为可执行jar->  -->
 <build>
     <plugins>
         <plugin>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
     </plugins>
 </build>
</project>

创建主类，springboot中内置了Tomcat

package com.java;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {

 public static void main(String[] args) {
     // TODO Auto-generated method stub
     SpringApplication.run(Application.class, args);
 }
}

创建Controller

package com.java.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
//将controller的方法返回的对象通过适当的转换器转换为指定的格式之后，写入到response对象的body区，通常用来返回JSON数据或者是XML数据
@ResponseBody
@Controller
public class HelloController {
    @RequestMapping("/hello")
    public String hello() {
        return "Hello Spring Boot!";
    }
}

运行主类，访问http://127.0.0.1:8080/hello