创建springboot项目有多种方式

本文就是使用maven创建springboot项目做一个记录

1. 创建maven项目，按下面的选择，然后就一直next

   

2. 创建项目进来后，修改pom文件(主要添加springboot的父级依赖，以及一些起步依赖包，如starter-web，starter-test，devtools等)

   <?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>org.lys</groupId>
     <artifactId>blog-parent</artifactId>
     <version>1.0-SNAPSHOT</version>
   
     <parent>
       <artifactId>spring-boot-starter-parent</artifactId>
       <groupId>org.springframework.boot</groupId>
       <version>2.6.2</version>
     </parent>
   
     <name>blog-parent</name>
     <!-- FIXME change it to the project's website -->
     <url>http://www.example.com</url>
   
     <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <maven.compiler.source>1.7</maven.compiler.source>
       <maven.compiler.target>1.7</maven.compiler.target>
     </properties>
   
     <dependencies>
   <!--    springboot开发web的起步依赖-->
       <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>
       </dependency>
   
       <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <optional>true</optional>
       </dependency>
     </dependencies>
   
     <build>
       <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
         <plugins>
           <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
           <plugin>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
             <version>2.6.3</version>
           </plugin>
         </plugins>
       </pluginManagement>
     </build>
   </project>
   

3. 编写启动类

   package com.lys;
   
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   @SpringBootApplication
   public class Application {
       public static void main(String[] args) {
           SpringApplication.run(Application.class, args);
       }
   }
   

4. 编写一个Controller测试一下

   package com.lys;
   
   import org.springframework.stereotype.Controller;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   @RestController
   public class DemoController {
       @RequestMapping("/hello")
       public String hello() {
           return "hello!!!!";
       }
   }
   

5. 启动项目，访问lcoalhost下的/hello

   

通过以上，搭建起步springboot就好了！！！

---

【踩坑提示】

package com.lys;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class Test1 {
    @Test
    void demo() {
        System.out.println(2);
    }
}

我在启动上面的代码时报下面的错：

经过排查，导致上述的问题的原因是【启动类所在的包和单元测试的包不在同一级根目录下】，如下：

将上面的包名改成一致，即【org】改成【com】，就不会再报错了