使用 AKKA-HTTP Java 加载静态内容时出错

Question

我第一次在Java中尝试AKKA-Http(akka-http_2.12 v 10.1.5，akka-stream_2.12 v 2.5.17(，但似乎无法为招摇的UI加载静态内容。我已经在下面添加了路由，并且能够通过 http://localhost:8080/api-docs/swagger.json 和 http://localhost:8080/api-docs/swagger.yaml 访问 json 和 yaml swagger端点 但是，swagger UI 端点即 http://localhost:8080/swagger 返回">存在内部服务器错误"。即使我在 src/main/resources 文件夹下有 swagger-ui 目录。我已经检查了日志，不太明白发生了什么..似乎是getFromResource和getFromResourceDirectory函数中的错误。之前报告了类似的问题

Route createRoute() {
return route(
path(PathMatchers.segment(generator.apiDocsPath()).slash("swagger.yaml"),
() -> get(() -> complete(generator.generateSwaggerYaml()))),
path(PathMatchers.segment(generator.apiDocsPath()).slash("swagger.json"),
() -> get(() -> complete(generator.generateSwaggerJson()))),
path("swagger", () -> route (
getFromResource("swagger-ui/index.html"),
getFromResourceDirectory("swagger-ui")
)
)
);
}
akka-spring-docker-system | 2018-10-06 08:27:11.292 ERROR 9 --- [lt-dispatcher-8] akka.actor.ActorSystemImpl               : Error during processing of request: 'java.lang.NullPointerException (No error message supplied)'. Completing with 500 Internal Server Error response. To change default exception handling behavior, provide a custom ExceptionHandler.
akka-spring-docker-system | 
akka-spring-docker-system | java.lang.NullPointerException: null
akka-spring-docker-system |     at akka.http.scaladsl.server.directives.FileAndResourceDirectives$ResourceFile$.apply(FileAndResourceDirectives.scala:286) ~[akka-http_2.12-10.1.5.jar!/:10.1.5]
akka-spring-docker-system |     at akka.http.scaladsl.server.directives.FileAndResourceDirectives.$anonfun$getFromResource$2(FileAndResourceDirectives.scala:106) ~[akka-http_2.12-10.1.5.jar!/:10.1.5]
akka-spring-docker-system |     at scala.Option.flatMap(Option.scala:171) ~[scala-library-2.12.4.jar!/:na]
akka-spring-docker-system |     at akka.http.scaladsl.server.directives.FileAndResourceDirectives.$anonfun$getFromResource$1(FileAndResourceDirectives.scala:106) ~[akka-http_2.12-10.1.5.jar!/:10.1.5]

Answer 1

回答我的问题，通过将 BOOT-INF 添加到路径来解决这个问题，如下所示

return route(
path(PathMatchers.segment(generator.apiDocsPath()).slash("swagger.yaml"),
() -> get(() -> complete(generator.generateSwaggerYaml()))),
path(PathMatchers.segment(generator.apiDocsPath()).slash("swagger.json"),
() -> get(() -> complete(generator.generateSwaggerJson()))),
pathPrefix("swagger", () -> route ( // everything that's inside `/swagger`
pathEndOrSingleSlash(() -> getFromResource("BOOT-INF/classes/swagger-ui/index.html")), // `/swagger/` or `/swagger`
getFromResourceDirectory("BOOT-INF/classes/swagger-ui") // everything else in `/swagger/...`
)
));