一、Swagger简介

Swagger 是一个规范和完整的框架，用于生成、描述、调用和可视化 RESTful 风格的 Web 服务。
总体目标是使客户端和文件系统作为服务器以同样的速度来更新。文件的方法、参数和模型紧密集成到服务器端的代码，允许 API 来始终保持同步。Swagger 让部署管理和使用功能强大的 API 从未如此简单。

二、创建项目

引入依赖

<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-boot-starter</artifactId>
  <version>3.0.0</version>
</dependency>

修改启动类

添加注解@EnableOpenApi

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.oas.annotations.EnableOpenApi;

@SpringBootApplication
@EnableOpenApi
public class SwaggerDemoApplication {

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

创建Swagger配置类

import static springfox.documentation.service.ApiInfo.DEFAULT_CONTACT;
import java.util.ArrayList;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.oas.annotations.EnableOpenApi;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;

/**
 * @author techoc
 * @Date 2021/4/11
 */
@EnableOpenApi  //开启swagger3
@Configuration
public class SwaggerConfig {
    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.OAS_30) //与swagger2.0不同
            //开启swagger
            .enable(true)
            .groupName("swagger")
            .apiInfo(apiInfo())
            .select()
            //设置扫描路径
            .apis(RequestHandlerSelectors.basePackage("cn.techoc.swaggerdemo.controller"))
            //指定扫描web路径
            //.paths(PathSelectors.ant("/techoc/**"))
            .build();
    }

    private ApiInfo apiInfo() {
        //作者信息
        Contact contact = new Contact("Techoc", "https://techoc.xyz", "techoc76@gmail.com");
        return new ApiInfo(
            //文档标题
            "Swagger-demo",
            //文档描述
            "学习Swagger的demo项目",
            //文档版本
            "2.0",
            //组织链接
            "https://techoc.xyz",
            //连接点
            contact,
            //开源协议
            "Apache 2.0",
            //开源协议url
            "https://www.apache.org/licenses/LICENSE-2.0",
            new ArrayList<>());
    }
}

创建Controller

package cn.techoc.swaggerdemo.controller;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;


/**
 * @author techoc
 * @Date 2021/4/11
 */
@RestController
@Api(tags = "用户管理")
public class HelloController {

    @ApiOperation("返回id")
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    @ApiImplicitParam(name = "id", value = "用户编号", readOnly = true)
    public int hello(@RequestParam(required = true) int id) {
        return id + 2;
    }
}