SpringBoot IDEA联不了网创建项目的3种方式(官网创建版、阿里云版、手工制作版)

package com.qing.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
//rest模式:写在类上,把类变成控制器
@RestController
//请求的url
@RequestMapping("/books")
public class BookController {
    //请求方式是get
    @GetMapping
    public String getById(){
        System.out.println("console:SpringBoot is running2");
        return "rest:SpringBoot is running2";
    }
}
 

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.0</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 </dependencies>

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