后端 API 接口文档 Swagger 使用

Swagger 是什么

swagger是一款可以根据 restful 风格生成的接口开发文档，并且支持做测试的一款中间软件。
例如当我们在开发前后端分离项目时，当后端开发完一个功能想要测试时，若此时还没有相应的前端页面发起请求，可以通过 swagger 进行测试(功能类似于 postman)。

使用

这里以 knife4j 为例演示下怎么使用（knife4j可以看作是Swagger的升级版，但是界面比Swagger更好看，功能更丰富）。

导入坐标

首先需要在 pom.xml 中导入 knife4j 坐标，如下

<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId>
</dependency>

配置

package com.sky.config;import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;/*** 配置类，注册web层相关组件*/
@Configuration
@Slf4j
public class WebMvcConfiguration extends WebMvcConfigurationSupport {/*** 通过knife4j生成接口文档* @return*/@Beanpublic Docket docket() {ApiInfo apiInfo = new ApiInfoBuilder().title("苍穹外卖项目接口文档").version("2.0").description("苍穹外卖项目接口文档").build();Docket docket = new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo).select()//  指定扫描的包路径来定义指定要建立API文档的控制器类或方法.apis(RequestHandlerSelectors.basePackage("com.sky.controller")).paths(PathSelectors.any()).build();return docket;}/*** 设置静态资源映射* @param registry*/protected void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/doc.html").addResourceLocations("classpath:/META-INF/resources/");registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");}
}

编写 Controller

package com.sky.controller.admin;import com.sky.constant.JwtClaimsConstant;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.entity.Employee;
import com.sky.properties.JwtProperties;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import com.sky.utils.JwtUtil;
import com.sky.vo.EmployeeLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.HashMap;
import java.util.Map;/*** 员工管理*/
@RestController
@RequestMapping("/admin/employee")
@Slf4j
public class EmployeeController {@Autowiredprivate EmployeeService employeeService;@Autowiredprivate JwtProperties jwtProperties;/*** 登录** @param employeeLoginDTO* @return*/@PostMapping("/login")public Result<EmployeeLoginVO> login(@RequestBody EmployeeLoginDTO employeeLoginDTO) {log.info("员工登录：{}", employeeLoginDTO);Employee employee = employeeService.login(employeeLoginDTO);//登录成功后，生成jwt令牌Map<String, Object> claims = new HashMap<>();claims.put(JwtClaimsConstant.EMP_ID, employee.getId());String token = JwtUtil.createJWT(jwtProperties.getAdminSecretKey(),jwtProperties.getAdminTtl(),claims);EmployeeLoginVO employeeLoginVO = EmployeeLoginVO.builder().id(employee.getId()).userName(employee.getUsername()).name(employee.getName()).token(token).build();return Result.success(employeeLoginVO);}/*** 退出** @return*/@PostMapping("/logout")public Result<String> logout() {return Result.success();}}