【SpringFox / Swagger文档生成工具】使用过程中的几个问题积累

转载本文请标明出处，谢谢！

SpringFox是最新版的Swagger文档生成工具，SpringFox官方文档参见：SpringFox官方参考文档

SpringFox与Spring Boot的集成

1. 添加配置类

package focuson.config;

import com.dianrong.labelaggregator.protocol.request.DisplayLabelsRequest;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

/**
 * @Date 16-3-20 上午11:55
 */
@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(new ApiInfoBuilder().title("用户查询系统API").description("用户查询系统API Document").build())
                .ignoredParameterTypes(UserRequest.class) //忽略“/list”接口参数
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.dianrong.labelaggregator.controller"))
                .paths(PathSelectors.any())
                .build();
    }
}

其中ignoredParameterTypes的作用后面再将

1. 加载配置文档

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.util.StringUtils;

@ComponentScan("focuson.config")//此处会扫描config包，加载配置文件
@SpringBootApplication
public class LabelAggregatorBootstrap {

    private static final String PROFILE = "spring.profiles.active";

    public static void main(String[] args) {
        if (StringUtils.isEmpty(System.getProperty(PROFILE))) {
            System.setProperty(PROFILE, "prod");
        }

        SpringApplication.run(LabelAggregatorBootstrap.class, args);
    }
}

1. Controller API上SpringFox注解的使用

package focuson.controller;

import focuson.protocol.response.BaseResponse;
import com.dianrong.labelaggregator.service.UserQueryService;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

/**
 * @Author Focuson
 * @Date 16-9-26 上午10:37
 */
@RestController
@RequestMapping("/user")
public class UserController extends BaseController {
    /**
     * API 文档地址： http://localhost:8090/swagger-ui.html
     */
    @Autowired
    private UserQueryService userQueryService;

    @ApiOperation(value = "显示标签", httpMethod = "GET")
    @ApiImplicitParams(value = {
            @ApiImplicitParam(name = "school", value = "学校名称",
                    required = true, paramType = "query", dataType = "String"),
            @ApiImplicitParam(name = "name", value = "姓名",
                    required = true, paramType = "query", dataType = "String")
    })
    @ApiResponses(value = {
            @ApiResponse(code = 200, message = "成功",
                    response = UserResponse.class, responseContainer = "List")
    })
    @GetMapping(path = "/list", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity queryUsers(
            @Valid UserRequest request, BindingResult bindingResult) {
        return excute(request, req -> userQueryService.queryUsers(request), bindingResult);
    }
}

UserRequest中封装了name和school两个参数，excute方法在BaseController中，此处省略部分代码。

1. 访问文档地址
   http://localhost:8090/swagger-ui.html
   文档样式
   

问题一 ：Controller API中用对象来接收url参数，用什么注解

这个问题在上文中已经解决，基本分为两步：
第一步：在配置文件中使用.ignoredParameterTypes(XXX.class)
第二步：在api上方使用@ApiImplicitParams和@ApiImplicitParam注解

问题二：Swagger文档空白，Swagger与自己实现的HttpMessageConverter不兼容

spring-boot配置中使用了如下配置，造成Swagger生成的文档空白

@Configuration
@Slf4j
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List> converters) {
        try {
            converters.add(new GsonConverter().getObject());
        } catch (Exception e) {
            // Ignore exception
            log.warn("Failed to add converter ", e);
        }
    }
}

解决这类办法需要实现自己的JSON转换

import com.google.common.base.Strings;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import springfox.documentation.spring.web.json.Json;
public class MyGson {
    private Gson createGson(FieldNamingPolicy policy) {
        return new GsonBuilder()
                .setFieldNamingPolicy(policy)
                //Register SpringFox Json.class adapter
                .registerTypeAdapter(Json.class, new SpringfoxJsonToGsonAdapter())
                .create();
    }

    public static class SpringfoxJsonToGsonAdapter implements JsonSerializer {
        @Override
        public JsonElement serialize(Json src, Type typeOfSrc, JsonSerializationContext context) {
            final JsonParser parser = new JsonParser();
            return parser.parse(src.value());
        }
    }
}

问题三：No handler found for GET /swagger-ui.html

参考：解决办法参考链接
解决办法：
Without Spring Boot, you don’t have the luxury of auto-configuration of your resource handlers. Swagger UI adds a set of resources which you must configure as part of a class that extends WebMvcConfigurerAdapter, and is annotated with @EnableWebMvc.

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("swagger-ui.html")
      .addResourceLocations("classpath:/META-INF/resources/");

    registry.addResourceHandler("/webjars/**")
      .addResourceLocations("classpath:/META-INF/resources/webjars/");
}