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入门案例之官网版
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https://spring.io/
    Projects
        Spring Boot
            Quickstart Your Project
                Spring Initializr
                    Group: cn.tedu
                    Artifact: springboot_01_02_quickstart
                    Package name: cn.tedu.springboot
                    Dependencies: Spring Web
                    GENERATE

自动下载springboot_01_02_quickstart.zip文件。

解压得到springboot_01_02_quickstart目录，放到springboot项目目录下。

IDEA
    文件
        项目结构...
            模块
                +导入模块
                    springboot_01_02_quickstart
                        从外部模型导入模块
                            Maven

在/src/main/java/cn/tedu/springboot/controller目录下创建BookController.java文件：

@RestController
@RequestMapping("/books")
public class BookController {
    @GetMapping
    public String getBooks() {
        System.out.println("Spring Boot is running ...");
        return "Spring Boot is running ...";
    }
}

Springboot0102QuickstartApplication右键
    运行

例程：springboot_01_02_quickstart