/**
   * 聚合各個服務(wù)的swagger接口
   *
   * @author ksyzz
   * @since <pre>2019/04/09</pre>
   */
  @Component
  public class MySwaggerResourceProvider implements SwaggerResourcesProvider {
  
    /**
     * swagger2默認(rèn)的url后綴
     */
    private static final String SWAGGER2URL = "/v2/api-docs";
  
    /**
     * 網(wǎng)關(guān)路由
     */
    private final RouteLocator routeLocator;
  
    /**
     * 網(wǎng)關(guān)應(yīng)用名稱
     */
    @Value("${spring.application.name}")
    private String self;
  
    @Autowired
    public MySwaggerResourceProvider(RouteLocator routeLocator) {
      this.routeLocator = routeLocator;
    }
  
    @Override
    public List<SwaggerResource> get() {
      List<SwaggerResource> resources = new ArrayList<>();
      List<String> routeHosts = new ArrayList<>();
      // 由于我的網(wǎng)關(guān)采用的是負(fù)載均衡的方式，因此我需要拿到所有應(yīng)用的serviceId
      // 獲取所有可用的host：serviceId
      routeLocator.getRoutes().filter(route -> route.getUri().getHost() != null)
          .filter(route -> !self.equals(route.getUri().getHost()))
          .subscribe(route -> routeHosts.add(route.getUri().getHost()));
  
      // 記錄已經(jīng)添加過的server，存在同一個應(yīng)用注冊了多個服務(wù)在nacos上
      Set<String> dealed = new HashSet<>();
      routeHosts.forEach(instance -> {
        // 拼接url，樣式為/serviceId/v2/api-info，當(dāng)網(wǎng)關(guān)調(diào)用這個接口時，會自動通過負(fù)載均衡尋找對應(yīng)的主機(jī)
        String url = "/" + instance + SWAGGER2URL;
        if (!dealed.contains(url)) {
          dealed.add(url);
          SwaggerResource swaggerResource = new SwaggerResource();
          swaggerResource.setUrl(url);
          swaggerResource.setName(instance);
          resources.add(swaggerResource);
        }
      });
      return resources;
    }
  }

 /**
   * swagger聚合接口，三個接口都是swagger-ui.html需要訪問的接口
   *
   * @author ksyzz
   * @since <pre>2019/04/09</pre>
   */
  @RestController
  @RequestMapping("/swagger-resources")
  public class SwaggerResourceController {
    private MySwaggerResourceProvider swaggerResourceProvider;
  
    @Autowired
    public SwaggerResourceController(MySwaggerResourceProvider swaggerResourceProvider) {
      this.swaggerResourceProvider = swaggerResourceProvider;
    }
  
    @RequestMapping(value = "/configuration/security")
    public ResponseEntity<SecurityConfiguration> securityConfiguration() {
      return new ResponseEntity<>(SecurityConfigurationBuilder.builder().build(), HttpStatus.OK);
    }
  
    @RequestMapping(value = "/configuration/ui")
    public ResponseEntity<UiConfiguration> uiConfiguration() {
      return new ResponseEntity<>(UiConfigurationBuilder.builder().build(), HttpStatus.OK);
    }
  
    @RequestMapping
    public ResponseEntity<List<SwaggerResource>> swaggerResources() {
      return new ResponseEntity<>(swaggerResourceProvider.get(), HttpStatus.OK);
    }
  }