【spirngboot2】实现第一个接口，返回hello world!

引入web依赖

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.2.0.RELEASE</version> </dependency>

编写controller

package com.example.demo.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/hello") public class HelloController { @RequestMapping("/index") public String index() { return "hello world!"; } }

其中@RestController相当于@Controller并给每一个接口添加@ResponseBody注解

application.properties配置

#端口号，不填默认8080 server.port=9999 #项目名称，不填默认空 server.servlet.context-path=/demo

右键启动DemoApplication.java，地址栏输入http://127.0.0.1:9999/demo/hello/index查看结果