2.springboot：快速创建springboot项目

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

@SpringBootApplication
public class Springboot01Application {
    public static void main(String[] args) {
        SpringApplication.run(Springboot01Application.class, args);
    }
}

//此时类的所有方法都会返回数据给浏览器（对象是专为json）
//@RestController  = @ResponseBody + @Controller
@ResponseBody
@Controller
public class Helloword {
    @RequestMapping("/hello")
    public  String hello(){

        return "Hello tow!";
    }
}