简单使用Swagger

1、介绍

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(https://swagger.io/)。

它的主要作用是：

1. 使得前后端分离开发更加方便，有利于团队协作
2. 接口的文档在线自动生成，降低后端开发人员编写接口文档的负担
3. 功能测试Spring 已经将 Swagger 纳入自身的标准，建立了 Spring-swagger 项目，现在叫 Springfox。通过在项目中引入 Springfox ，即可非常简单快捷的使用 Swagger。

knife4j 是为 Java MVC 框架集成 Swagger 生成 Api 文档的增强解决方案,前身是 swagger-bootstrap-ui,取名 kni4j 是希望它能像一把匕首一样小巧,轻量,并且功能强悍!

目前，一般都使用 knife4j 框架。

2、 使用步骤

1、导入 knife4j 的 maven 坐标

在 pom.xml 中添加依赖

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

2、在配置类中加入 knife4j 相关配置

WebMvcConfiguration.java

/**
     * 通过knife4j生成接口文档
     * @return
*/
    @Bean
    public 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()
                .apis(RequestHandlerSelectors.basePackage("com.sky.controller"))
                .paths(PathSelectors.any())
                .build();
        return docket;
    }
/**
     * 通过knife4j生成接口文档
     * @return
*/
    @Bean
    public 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()
                .apis(RequestHandlerSelectors.basePackage("com.sky.controller"))
                .paths(PathSelectors.any())
                .build();
        return docket;
    }
/**
     * 通过knife4j生成接口文档
     * @return
*/
    @Bean
    public 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()
                .apis(RequestHandlerSelectors.basePackage("com.sky.controller"))
                .paths(PathSelectors.any())
                .build();
        return docket;
    }

3、设置静态资源映射，否则接口文档页面无法访问

WebMvcConfiguration.java

/**
     * 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/");
}
/**
     * 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/");
}
/**
     * 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/");
}

4、访问测试

接口文档访问路径为 http://ip:port/doc.html —> http://localhost:8080/doc.html

接口测试:测试登录功能

思考：通过 Swagger 就可以生成接口文档，那么我们就不需要 Yapi 了？

1、Yapi 是设计阶段使用的工具，管理和维护接口

2、Swagger 在开发阶段使用的框架，帮助后端开发人员做后端的接口测试

3、 常用注解

通过注解可以控制生成的接口文档，使接口文档拥有更好的可读性，常用注解如下：

注解	说明
@Api	用在类上，例如 Controller，表示对类的说明
@ApiModel	用在类上，例如 entity、DTO、VO
@ApiModelProperty	用在属性上，描述属性信息
@ApiOperation	用在方法上，例如 Controller 的方法，说明方法的用途、作用

接下来，使用上述注解，生成可读性更好的接口文档

在 sky-pojo 模块中

EmployeeLoginDTO.java

@Data
@ApiModel(description = "员工登录时传递的数据模型")
public class EmployeeLoginDTO implements Serializable {
    @ApiModelProperty("用户名")
    private String username;
    @ApiModelProperty("密码")
    private String password;
}
@Data
@ApiModel(description = "员工登录时传递的数据模型")
public class EmployeeLoginDTO implements Serializable {

    @ApiModelProperty("用户名")
    private String username;

    @ApiModelProperty("密码")
    private String password;

}
@Data
@ApiModel(description = "员工登录时传递的数据模型")
public class EmployeeLoginDTO implements Serializable {

    @ApiModelProperty("用户名")
    private String username;

    @ApiModelProperty("密码")
    private String password;

}

EmployeeLoginVo.java

package com.sky.vo;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(description = "员工登录返回的数据格式")
public class EmployeeLoginVO implements Serializable {
    @ApiModelProperty("主键值")
    private Long id;
    @ApiModelProperty("用户名")
    private String userName;
    @ApiModelProperty("姓名")
    private String name;
    @ApiModelProperty("jwt令牌")
    private String token;
}
package com.sky.vo;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(description = "员工登录返回的数据格式")
public class EmployeeLoginVO implements Serializable {

    @ApiModelProperty("主键值")
    private Long id;

    @ApiModelProperty("用户名")
    private String userName;

    @ApiModelProperty("姓名")
    private String name;

    @ApiModelProperty("jwt令牌")
    private String token;

}
package com.sky.vo;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(description = "员工登录返回的数据格式")
public class EmployeeLoginVO implements Serializable {

    @ApiModelProperty("主键值")
    private Long id;

    @ApiModelProperty("用户名")
    private String userName;

    @ApiModelProperty("姓名")
    private String name;

    @ApiModelProperty("jwt令牌")
    private String token;

}

在 sky-server 模块中

EmployeeController.java

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 io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
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
@Api(tags = "员工相关接口")
public class EmployeeController {
    @Autowired
    private EmployeeService employeeService;
    @Autowired
    private JwtProperties jwtProperties;
    /**
     * 登录
     *
     * @param employeeLoginDTO
     * @return
     */
    @PostMapping("/login")
    @ApiOperation(value = "员工登录")
    public Result<EmployeeLoginVO> login(@RequestBody EmployeeLoginDTO employeeLoginDTO)  {
        //..............
    }
    /**
     * 退出
     *
     * @return
     */
    @PostMapping("/logout")
    @ApiOperation("员工退出")
    public Result<String> logout() {
        return Result.success();
    }
}
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 io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
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
@Api(tags = "员工相关接口")
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;
    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 登录
     *
     * @param employeeLoginDTO
     * @return
     */
    @PostMapping("/login")
    @ApiOperation(value = "员工登录")
    public Result<EmployeeLoginVO> login(@RequestBody EmployeeLoginDTO employeeLoginDTO)  {
        //..............


    }

    /**
     * 退出
     *
     * @return
     */
    @PostMapping("/logout")
    @ApiOperation("员工退出")
    public Result<String> logout() {
        return Result.success();
    }

}
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 io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
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
@Api(tags = "员工相关接口")
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;
    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 登录
     *
     * @param employeeLoginDTO
     * @return
     */
    @PostMapping("/login")
    @ApiOperation(value = "员工登录")
    public Result<EmployeeLoginVO> login(@RequestBody EmployeeLoginDTO employeeLoginDTO)  {
        //..............


    }

    /**
     * 退出
     *
     * @return
     */
    @PostMapping("/logout")
    @ApiOperation("员工退出")
    public Result<String> logout() {
        return Result.success();
    }

}

启动服务：访问http://localhost:8080/doc.html