java.lang.IllegalStateException:请求已在vertx3.0中读取异常。我试过很多方面。简单的formupload工作正常。但是当我使用body处理程序时,它会抛出异常。有人可以帮忙吗?
import io.vertx.core.AbstractVerticle;
import io.vertx.core.http.HttpHeaders;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.handler.BodyHandler;
/*
* @author Gogs
*/
public class TestServer extends AbstractVerticle {
// Convenience method so you can run it in your IDE
public static void main(String[] args) {
Runner.runExample(TestServer.class);
}
@Override
public void start() throws Exception {
Router router = Router.router(vertx);
// Enable multipart form data parsing
router.route().handler(BodyHandler.create());
router.route("/").handler(routingContext -> {
routingContext.response().putHeader("content-type", "text/html").end(
"<form action=\"/form\" ENCTYPE=\"multipart/form-data\" method=\"POST\" name=\"wibble\">\n" +
"choose a file to upload:<input type=\"file\" name=\"myfile\"/><br>"+
" <input type=\"submit\"/>"+
"</form>"
);
});
// handle the form
router.post("/form").handler(ctx -> {
ctx.request().setExpectMultipart(true);
ctx.request().uploadHandler(upload -> {
upload.exceptionHandler(cause -> {
ctx.response().setChunked(true).end("Upload failed");
});
upload.endHandler(v -> {
ctx.response().setChunked(true).end("Successfully uploaded to " + upload.filename());
});
// FIXME - Potential security exploit! In a real system you must check this filename
// to make sure you're not saving to a place where you don't want!
// Or better still, just use Vert.x-Web which controls the upload area.
upload.streamToFileSystem(upload.filename());
});
});
vertx.createHttpServer().requestHandler(router::accept).listen(8090);
}
}
Am seeing the below exception.
Feb 02, 2016 6:48:54 PM io.vertx.ext.web.impl.RoutingContextImplBase
SEVERE: Unexpected exception in route
java.lang.IllegalStateException: Request has already been read
at io.vertx.core.http.impl.HttpServerRequestImpl.checkEnded(HttpServerRequestImpl.java:426)
at io.vertx.core.http.impl.HttpServerRequestImpl.setExpectMultipart(HttpServerRequestImpl.java:322)
at io.vertx.ext.web.impl.HttpServerRequestWrapper.setExpectMultipart(HttpServerRequestWrapper.java:166)
at com.vertx.http.upload.TestServer.lambda$1(TestServer.java:43)
at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:221)
at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:78)
at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:93)
at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:155)
at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.uploadEnded(BodyHandlerImpl.java:135)
at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.lambda$null$35(BodyHandlerImpl.java:109)
at io.vertx.core.http.impl.HttpServerFileUploadImpl.notifyEndHandler(HttpServerFileUploadImpl.java:213)
at io.vertx.core.http.impl.HttpServerFileUploadImpl.lambda$handleComplete$165(HttpServerFileUploadImpl.java:206)
at io.vertx.core.file.impl.AsyncFileImpl.lambda$doClose$226(AsyncFileImpl.java:470)
at io.vertx.core.impl.ContextImpl.lambda$wrapTask$16(ContextImpl.java:335)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分:2)
您正在阅读请求正文两次。第一次阅读是通过BodyHandler
(请参阅BodyHanderImpl
),第二次是您自己的处理程序(请参阅HttpServerRequestImpl
和HttpServerFileUploadImpl
)。
BodyHandler
完全从请求中读取正文,并在context.body
中显示。路由器的配置方式:
router.route().handler(BodyHandler.create());
在您的路由器处理的每个请求上都会完整地读取正文。
您的处理程序也在完全读取请求正文并将其内容写入文件系统。您的路由器配置为仅在对/form
进行POST时执行处理程序。
回顾一下这个流程,当您向/form
BodyHandler
提交上传时,正在完全读取请求,将内容存储在context.body中,并将请求正文标记为已读。您的路由器匹配上传处理程序的uri路径,并尝试再次读取正文,但由于已经读取了异常,因此会引发异常。
一些想法......
如果您打算将上传的文件写入文件系统,那么您真的不需要在路由器中配置BodyHandler。当您需要内存中的主体以便以某种方式处理它时,您可能希望使用BodyHandler。除非您打算在路由器收到的非常单一的请求上执行处理程序,否则不应配置没有匹配条件的处理程序(即router.route().handler(...)
)。这种处理程序的一个很好的用例是CookieHandler。
答案 1 :(得分:0)
Gogs,我正在查看这段代码,很有可能我们可以实现自己的路由器或类似的东西,然后可以在accept方法中管理...
答案 2 :(得分:0)
我们可以创建自己的bodyhandler ...... 在我们的配置文件中提供一个被忽略的路由列表: http://grepcode.com/file/repo1.maven.org/maven2/io.vertx/vertx-web/3.0.0/io/vertx/ext/web/handler/impl/BodyHandlerImpl.java#BodyHandlerImpl