java REST API 文档自动生成 —— springfox-swagger

springfox-swagger有什么用?

  • 自动生成restAPI文档
  • 文档在线查看/在线调试
  • 随着代码自动更新
  • 自动生成客户端代码
  • 自动生成server模拟代码

openAPI-specification/swagger/springfox

openAPI-specification 是一套描述REST API的规范
swagger 是实现openAPI-specification的一套工具。是个具体实现
springfox 原名swagger-springmvc 是对swagger的java spring的集成。 目前也可以兼容swagger之外的规范,例如RAML和jsonapi。


swagger 1和 swagger 2的区别

swagger1 指的是 OpenAPI Spec用的是1.2版本
swagger2 指的是 OpenAPI Spec用的是2.0版本
springfox-swagger2 对应的 swagger-core 版本是 1.5.3- 1.5.4
Swagger core Version Release Date OpenAPI Spec compatibility Notes Status
2.0.0 2018-03-20 3.0 tag v2.0.0 Supported
2.0.0-rc4 2018-01-22 3.0 tag v2.0.0-rc4 Supported
2.0.0-rc3 2017-11-21 3.0 tag v2.0.0-rc3 Supported
2.0.0-rc2 2017-09-29 3.0 tag v2.0.0-rc2 Supported
2.0.0-rc1 2017-08-17 3.0 tag v2.0.0-rc1 Supported
1.5.18 (current stable) 2018-01-22 2.0 tag v1.5.18 Supported
1.5.17 2017-11-21 2.0 tag v1.5.17 Supported
1.5.16 2017-07-15 2.0 tag v1.5.16 Supported
1.3.12 2014-12-23 1.2 tag v1.3.12 Supported
1.2.4 2013-06-19 1.1 tag swagger-project_2.10.0-1.2.4 Deprecated
1.0.0 2011-10-16 1.0 tag v1.0 Deprecated
  • Prerequisites

    You need the following installed and available in your $PATH:

    • Java 7 (http://java.oracle.com)
    • Apache maven 3.0.4 or greater (http://maven.apache.org/)
  • Prerequisites 2.X

    You need the following installed and available in your $PATH:

    • Java 8 (http://java.oracle.com)
    • Apache maven 3.0.4 or greater (http://maven.apache.org/)


springfox 架构

                                                                                                                               
                                   +------------------+                                                                 
                                   |                  |        Contains the internal service and                        
                                   |  springfox-core  |        schema description models along with                     
                                   |                  |        their builders.                                          
                                   +---------+--------+                                                                 
                                             ^                                                                          
                                   +---------+--------+                                                                 
                                   |                  |        Contains the service provider interfaces that            
                                   |  springfox-spi   |        can be used to extend and enrich the service models.     
                                   |                  |        For e.g. swagger specific annotation processors.         
                                   +---+------+----+--+                                                                 
                                       ^      ^    ^                                                                    
                       +---------------+----+ | +--+------------------+                                                 
Schema inference       |                    | | |                     | spring web specific extensions that can build
extensions that help   |  springfox-schema  | | |springfox-spring-web | the service models based on RequestMapping   
build up the schema for|                    | | |                     | information. This is the heart library that  
the parameters, models +--------------------+ | +---------------------+ infers the service model.                    
and responses                                 |                                                                         
                                 +------------+-------------+                                                           
                                 |                          |   Common swagger specific extensions                      
                                 | springfox-swagger-common |   that are aware of the different                         
                                 |                          |   swagger annotations.                                    
                                 +-----+---------------+----+                                                           
                                       ^               ^                                                                
                         +-------------+----+     +----+--------------+                                                 
                         |                  |     |                   |  Configurations, and mapping layer              
                         |springfox-swagger1|     |springfox-swagger2 |  that know how to convert the                   
                         |                  |     |                   |  service models to swagger 1.2 and              
                         +------------------+     +-------------------+  swagger 2.0 specification documents.  A
                                                                         Also contains the controller for each
                                                                         of the specific formats.
    


springfox-swagger2

  1. 引入jar包

    
        io.springfox
        springfox-swagger2
        2.x.x
    
    
        io.springfox
        springfox-swagger-ui
        2.x.x
    
    
    
  2. 全局配置boot

    @SpringBootApplication
    @EnableSwagger2
    public class Application  {
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
        
        @Bean
        public Docket testApi() {
            ApiInfo apiInfo = new ApiInfoBuilder()
                    .title("API接口")
                    .description("api")
                    .build();
            return new Docket(DocumentationType.SWAGGER_2)
                    .groupName("default")
                    .genericModelSubstitutes(DeferredResult.class)
                    .useDefaultResponseMessages(false)
                    .forCodeGeneration(true)
                    .pathMapping("/")
                    .select()
                    .build()
                    .apiInfo(apiInfo);
        }
    }
    
    
  3. 全局配置非boot

    @Configuration
    @EnableWebMvc
    @EnableSwagger2
    public class Application  {
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
        
        @Bean
        public Docket testApi() {
            ApiInfo apiInfo = new ApiInfoBuilder()
                    .title("API接口")
                    .description("api")
                    .build();
            return new Docket(DocumentationType.SWAGGER_2)
                    .groupName("default")
                    .genericModelSubstitutes(DeferredResult.class)
                    .useDefaultResponseMessages(false)
                    .forCodeGeneration(true)
                    .pathMapping("/")
                    .select()
                    .build()
                    .apiInfo(apiInfo);
        }
    }
    
    
  4. 配置controller

    @Api(tags = {"测试组"})
    @RestController
    public class Controller {
    
        @ApiOperation(value = "方法1", notes = "方法1描述")
        @RequestMapping(value = "/CH070", method = {RequestMethod.POST}
            , produces = {"application/json","application/xml"})
        public Response method1(@ApiParam(required = true, value = "参数1")
             @RequestParam(value = "method11") String method2
            , @ApiParam(required = true, value = "method2") 
             @RequestParam(value = "method2", required = true) String method2) {
        }
    
    }
    
  5. 集成 spring-data-rest / bean-validators

    
        io.springfox
        springfox-bean-validators
        ${springfox.version}
    
    
        io.springfox
        springfox-data-rest
        ${springfox.version}
     
    
    @Import({SpringDataRestConfiguration.class, BeanValidatorPluginsConfiguration.class})
    


springfox-swagger-ui

swagger-ui 是一个node工程,通过swagger暴露的接口,展示文档信息
springfox-swagger-ui 是一个webjar, 方便进行maven集成
springfox-ui 目录结构:
```
META-INF
    |- resources
        |- webjars
            |-swagger-ui.html
            |-springfox-swagger-ui
                |-css
                |-fonts
                |-images
                |-lang
                |-lib
                |-o2c.html
                |-springfox.js
                |-swagger-ui.min.js
```
什么是webjar?
  • 第三方小工具, 把静态资源进行打包,幷版本化管理。

  • spring-boot 默认支持。

    //WebMvcAutoConfiguration#addResourceHandlers
    if (!registry.hasMappingForPattern("/webjars/**")) {
        customizeResourceHandlerRegistration(
                registry.addResourceHandler("/webjars/**")
                        .addResourceLocations(
                                "classpath:/META-INF/resources/webjars/")
                .setCachePeriod(cachePeriod));
    }
    
  • 非spring-boot

    
    
    
其他风格的替代品:
  • swagger-ui-layer
  • Swagger-Bootstrap-UI

swagger-codegen

swagger-codegen这个是总入口。不过文档比较乱,不太好找,下面列出几个关键点
从哪里获得输入的配置文件?
  • springfox-swagger-ui 默认输出地址为/v2/api-docs?group=default。
    group可以自定义,default group可以不传。 通过浏览器地址栏请求可能无法接受json格式的返回报文,这时可以通过更改spring-boot配置项springfox.documentation.swagger.v2.path 添加后缀解决,例如:/v2/api-docs.json

    #springfox.documentation.swagger2.web.Swagger2Controller
    public static final String DEFAULT_URL = "/v2/api-docs";
        
    @RequestMapping(
        value = DEFAULT_URL,
        method = RequestMethod.GET,
        produces = { APPLICATION_JSON_VALUE, HAL_MEDIA_TYPE })
    @PropertySourcedMapping(
        value = "${springfox.documentation.swagger.v2.path}",
        propertyKey = "springfox.documentation.swagger.v2.path")
    @ResponseBody
    public ResponseEntity getDocumentation(
         @RequestParam(value = "group", required = false) String swaggerGroup,
        HttpServletRequest servletRequest) {
    
  • 在线生成 https://generator.swagger.io/ 貌似需要把配置文件暴露到外网

  • swagger-codegen-maven-plugin maven 自动化集成

  • 具体有哪些配置项 源码 文档没怎么说,源码里有列表。。

  • 模拟Server Server stub generator HOWTO 包括spring-boot和Spring MVC

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