为什么显示Jetty?

Why does it show Jetty?

我已经使用 https://http4s.org/:

构建了我的网络应用程序
object UserSvcServer {

  def stream[F[_]: ConcurrentEffect](implicit T: Timer[F], C: ContextShift[F]): Stream[F, Nothing] = {

    val helloWorldAlg = HelloWorld.impl[F]
    val httpApp = (
      UserSvcRoutes.helloWorldRoutes[F](helloWorldAlg)
      ).orNotFound

    val finalHttpApp = Logger.httpApp(true, true)(httpApp)

    for {

      exitCode <- JettyBuilder[F]
        .bindHttp(8080, "0.0.0.0")
        .mountHttpApp(finalHttpApp, "/")
        .serve
    } yield exitCode
  }.drain

} 

如您在上面的代码中所见,它使用 JettyBuilder

当我启动应用程序时,日志显示:

[main] INFO  o.e.j.util.log - Logging initialized @730ms to org.eclipse.jetty.util.log.Slf4jLog 
[ioapp-compute-0] INFO  o.e.j.s.Server - jetty-9.4.28.v20200408; built: 2020-04-08T17:49:39.557Z; git: ab228fde9e55e9164c738d7fa121f8ac5acd51c9; jvm 11.0.7+10-LTS 
[ioapp-compute-0] INFO  o.h.s.Http4sServlet - Detected Servlet API version 3.1 
[ioapp-compute-0] INFO  o.h.s.Http4sServlet - Using non-blocking servlet I/O with chunk size 4096 
[ioapp-compute-0] INFO  o.e.j.s.h.ContextHandler - Started o.e.j.s.ServletContextHandler@71cc4a24{/,null,AVAILABLE}   

这是否意味着 Web 应用程序已经在 J​​etty 上运行,我不必从 https://www.eclipse.org/jetty/ 下载 Jetty 服务器?

通常,war 文件必须放入 webapps 文件夹中:

如果您查看最有可能使用的 build.sbt of http4s you'll see that many of http4s libraries use Jetty as the underlying implementation. For instance http4s-jetty

所以不,您不必下载码头或任何其他容器。如果你想让你的代码需要一个容器,你很可能需要付出一些额外的努力。