java - 使用 java vertx 网络服务器提供单页 react 应用程序

Question

我正在使用 Vert.x 网络服务器将 React 应用程序作为静态内容提供。我希望它从路径 / 提供，然后在 React 应用程序中它有自己的路由使用 react-router 应该决定显示哪个页面。

到目前为止，我有以下内容:

Vertx vertx = Vertx.vertx();
HttpServer server = vertx.createHttpServer();
Router router = Router.router(vertx);
router.route().handler(BodyHandler.create());
router.route(HttpMethod.POST, "/rest/foo").handler(new FooHandler());
router.route(HttpMethod.GET, "/*").handler(StaticHandler.create()).failureHandler(event -> { // This serves up the React app
    event.response().sendFile("webroot/index.html").end();
});
server.requestHandler(router::accept).listen(12001);

如果我从请求 localhost:12001 开始，它会按预期工作，并且它还会正确处理从那一点开始的路径更改。但是，如果我尝试刷新其中一个具有由 react router 处理的路径的页面，那么我会在服务器日志中收到一堆错误(尽管页面确实加载正确)。

有人知道这里的问题是什么以及如何解决吗？

SEVERE: Unexpected exception in route
java.lang.IllegalStateException: Response has already been written
    at io.vertx.core.http.impl.HttpServerResponseImpl.checkWritten(HttpServerResponseImpl.java:561)
    at io.vertx.core.http.impl.HttpServerResponseImpl.end0(HttpServerResponseImpl.java:389)
    at io.vertx.core.http.impl.HttpServerResponseImpl.end(HttpServerResponseImpl.java:328)
    at co.uk.foo.webserver.server.WebServer.lambda$initialiseRoutes$0(WebServer.java:67)
    at co.uk.foo.webserver.server.WebServer$$Lambda$4/1197365356.handle(Unknown Source)
    at io.vertx.ext.web.impl.RouteImpl.handleFailure(RouteImpl.java:227)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:76)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:94)
    at io.vertx.ext.web.impl.RoutingContextImpl.doFail(RoutingContextImpl.java:355)
    at io.vertx.ext.web.impl.RoutingContextImpl.fail(RoutingContextImpl.java:119)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$2(StaticHandlerImpl.java:198)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl$$Lambda$17/1050258443.handle(Unknown Source)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.wrapInTCCLSwitch(StaticHandlerImpl.java:245)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.getFileProps(StaticHandlerImpl.java:264)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.sendStatic(StaticHandlerImpl.java:184)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:141)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:51)
    at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:221)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:78)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:94)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:155)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.end(BodyHandlerImpl.java:141)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl.lambda$handle$34(BodyHandlerImpl.java:61)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$$Lambda$14/1403708668.handle(Unknown Source)
    at io.vertx.core.http.impl.HttpServerRequestImpl.handleEnd(HttpServerRequestImpl.java:411)
    at io.vertx.core.http.impl.ServerConnection.handleEnd(ServerConnection.java:286)
    at io.vertx.core.http.impl.ServerConnection.processMessage(ServerConnection.java:404)
    at io.vertx.core.http.impl.ServerConnection.handleMessage(ServerConnection.java:134)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:515)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:421)
    at io.vertx.core.http.impl.VertxHttpHandler.lambda$channelRead$20(VertxHttpHandler.java:80)
    at io.vertx.core.http.impl.VertxHttpHandler$$Lambda$16/1532360211.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.lambda$wrapTask$18(ContextImpl.java:333)
    at io.vertx.core.impl.ContextImpl$$Lambda$11/511598695.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:225)
    at io.vertx.core.http.impl.VertxHttpHandler.channelRead(VertxHttpHandler.java:80)
    at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:124)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
    at java.lang.Thread.run(Thread.java:745)

Jun 26, 2016 4:22:08 PM io.vertx.ext.web.impl.RoutingContextImplBase
SEVERE: Unexpected exception in route
java.lang.IllegalStateException: Head already written
    at io.vertx.core.http.impl.HttpServerResponseImpl.doSendFile(HttpServerResponseImpl.java:434)
    at io.vertx.core.http.impl.HttpServerResponseImpl.sendFile(HttpServerResponseImpl.java:334)
    at io.vertx.core.http.impl.HttpServerResponseImpl.sendFile(HttpServerResponseImpl.java:52)
    at io.vertx.core.http.HttpServerResponse.sendFile(HttpServerResponse.java:275)
    at io.vertx.core.http.HttpServerResponse.sendFile(HttpServerResponse.java:262)
    at co.uk.foo.webserver.server.WebServer.lambda$initialiseRoutes$0(WebServer.java:67)
    at co.uk.foo.webserver.server.WebServer$$Lambda$4/1197365356.handle(Unknown Source)
    at io.vertx.ext.web.impl.RouteImpl.handleFailure(RouteImpl.java:227)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:76)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:94)
    at io.vertx.ext.web.impl.RoutingContextImpl.doFail(RoutingContextImpl.java:355)
    at io.vertx.ext.web.impl.RoutingContextImpl.fail(RoutingContextImpl.java:119)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$2(StaticHandlerImpl.java:189)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl$$Lambda$17/1050258443.handle(Unknown Source)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.getFileProps(StaticHandlerImpl.java:284)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.sendStatic(StaticHandlerImpl.java:184)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:141)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:51)
    at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:221)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:78)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:94)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:155)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.end(BodyHandlerImpl.java:141)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl.lambda$handle$34(BodyHandlerImpl.java:61)
    at io.vertx.ext.web.handler.impl.BodyHandlerImpl$$Lambda$14/1403708668.handle(Unknown Source)
    at io.vertx.core.http.impl.HttpServerRequestImpl.handleEnd(HttpServerRequestImpl.java:411)
    at io.vertx.core.http.impl.ServerConnection.handleEnd(ServerConnection.java:286)
    at io.vertx.core.http.impl.ServerConnection.processMessage(ServerConnection.java:404)
    at io.vertx.core.http.impl.ServerConnection.handleMessage(ServerConnection.java:134)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:515)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:421)
    at io.vertx.core.http.impl.VertxHttpHandler.lambda$channelRead$20(VertxHttpHandler.java:80)
    at io.vertx.core.http.impl.VertxHttpHandler$$Lambda$16/1532360211.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.lambda$wrapTask$18(ContextImpl.java:333)
    at io.vertx.core.impl.ContextImpl$$Lambda$11/511598695.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:225)
    at io.vertx.core.http.impl.VertxHttpHandler.channelRead(VertxHttpHandler.java:80)
    at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:124)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

我尝试了很多不同的方法来解决这个问题，但一无所获。相反，我决定编写自己的 handler，它会按照我想要的方式运行，并且我的原始问题中没有显示任何错误。

import io.vertx.core.Handler;
import io.vertx.core.http.HttpServerRequest;
import io.vertx.ext.web.RoutingContext;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class ReactAppHandler implements Handler<RoutingContext> {

    private static final Logger LOGGER = LogManager.getLogger(ReactAppHandler.class);

    private static final String WEB_ROOT_DIR = "webroot";
    private static final String INDEX_HTML = "/index.html";

    @Override
    public void handle(RoutingContext event) {

        HttpServerRequest request = event.request();
        String path = event.normalisedPath();

        LOGGER.info("Received a request for [" + path + "].");

        String requestedFilepath = path;

        if ("/".equals(requestedFilepath)) {
            LOGGER.info("Requested file is root path. Remapping to return the index page.");
            requestedFilepath = INDEX_HTML;
        }

        final String fileToCheck = WEB_ROOT_DIR + requestedFilepath;
        LOGGER.info("Checking if file exists at [" + fileToCheck + "].");

        event.vertx().fileSystem().exists(fileToCheck, fileExistsCheck -> {

            String fileToSend = WEB_ROOT_DIR + INDEX_HTML;

            if (fileExistsCheck.succeeded() && fileExistsCheck.result()) {
                LOGGER.info("File exists at path.");
                fileToSend = fileToCheck;
            } else {
                LOGGER.info("Could not find requested file, the index page will be returned instead.");
            }

            LOGGER.info("Returning file [" + fileToSend + "].");
            request.response().sendFile(fileToSend);
        });
    }
}