springboot-helloworld-idea

1、file-new-project-Spring Initializr-next:输入项目信息-next:web-next-finish

2、创建controller包

3、创建StudyController类

@RestController
@RequestMapping
public class StudyController {

    @RequestMapping(value = "/test", method = RequestMethod.GET)
    public String test(@RequestParam(value = "userName") String userName){
        return userName;
    }
}

4、访问http://localhost:8080/test?userName=a

备注：如果pom文件有问题

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.0.5.RELEASE</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>

修改为

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.0.2.RELEASE</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>