由于doOutput，无法编写URLConnection [英] Cannot write URLConnection because of doOutput

问题描述

我在这里问了一个问题，并且由于用户问题我已经解决了我的问题。这是我目前使用的代码。

I've asked a question here and I've fixed my problem thanks to an user. This is the code I am using at the moment.

void UploadToDatabase() throws MalformedURLException, IOException {
          URL website = new URL("http://mk7vrlist.altervista.org/databases/record_file.txt");
          WritableByteChannel rbc = Channels.newChannel(website.openConnection().getOutputStream());

          FileOutputStream fos;
          fos = new FileOutputStream("record_file.txt");
          fos.getChannel().transferTo(0, Long.MAX_VALUE, rbc);
          fos.close();
     }

我的目标是上传文件 record_file.txt 在特定的网络链接上，如上所示。但是，当我尝试运行此代码时，NetBeans给了我这个错误：

My goal is upload the file record_file.txt on a particular web link as you can see above. However, when I try to run this code, NetBeans gives me this error:

java.net.ProtocolException: cannot write to a URLConnection if doOutput=false - call setDoOutput(true)

我读了一些关于这个的东西我添加了声明 rbc 变量之后的代码。

I read some stuff about this and I added the following code just after the declaration of that rbc variable.

 URLConnection urlc = website.openConnection();
 urlc.setDoOutput(true);

顺便说一句，我总是有同样的错误。你能帮助我吗？

By the way, I always have the same error. Could you help me?

推荐答案

问题出在这一行：

WritableByteChannel rbc = Channels.newChannel(website.openConnection().getOutputStream());

您需要将 doOutput 设置为 true 为此工作。方法如下：

You will need to set doOutput to true for this to work. Here's how:

URLConnection urlc = website.openConnection();
urlc.setDoOutput(true);
WritableByteChannel rbc = Channels.newChannel(urlc.getOutputStream());

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