java - 无法将资源作为流读取

Question

我正在尝试从磁盘读取 HTML 文件。但它总是返回 null。我尝试将所有位置都放在目录中，但它仍然返回 null。

class MainVerticle : AbstractVerticle() {

  override fun start(startPromise: Promise<Void>) {
    vertx
      .createHttpServer()
      .requestHandler { req ->
       req.response()
      .putHeader("content-type", "text/plain")
      .end("Hello from Vert.x!")
     }
     .listen(8888) { http ->
        if (http.succeeded()) {
          startPromise.complete()
          println("HTTP server started on port 8888")
        } else {
          startPromise.fail(http.cause());
        }
      }

    var mailTemplateStream = (getStreamFromRes("emailVerification.html") as 
    InputStream).reader().readText()
    println(mailTemplateStream)

  }

  fun getStreamFromRes(fileName: String): InputStream? {
  val stream = Object::class.java.getResourceAsStream("/$fileName")
  return stream
 }
}

它总是抛出以下异常:-

SEVERE: null cannot be cast to non-null type java.io.InputStream
kotlin.TypeCastException: null cannot be cast to non-null type 
java.io.InputStream
    at example.starter.MainVerticle.start(MainVerticle.kt:26)
    at io.vertx.core.impl.DeploymentManager.lambda$doDeploy$9(DeploymentManager.java:556)
    at 
   io.vertx.core.impl.ContextImpl.executeTask(ContextImpl.java:369)
at io.vertx.core.impl.EventLoopContext.lambda$executeAsync$0(EventLoopContext.java:38)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:510)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:518)
at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1044)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)

这里通过函数 getStreamFromRes，我试图获取输入流。我已将文件 emailVerification.html 放置在 MainVerticle 类旁边，但它仍然返回 null。有谁知道我做错了什么？

更新:-我已将此项目添加到我的 github 项目中:- https://github.com/captabhi/abhishek09021998-gmail.com.git

Answer 1

您的 emailVerification.html 文件应与已编译的类文件一起复制到构建文件夹中。每个源文件都驻留在资源文件夹中并不意味着它会被类加载器自动拾取。您的构建脚本应将资源复制到构建文件夹中。