使用Maven创建基础的springboot项目

1. 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

2. 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>

3. 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

4. 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