文件URI在解析操作期间删除主机名路径 [英] File URI removing hostname path during a resolve operation

问题描述

我有一个资源已经通过使用文件URL从Windows网络上的网络共享加载而打开，例如文件：////remotemachine/my/path/spec.txt 。

I have a resource that has been opened by using a File URL to load from a network share on the Windows network, e.g. file:////remotemachine/my/path/spec.txt.

此文件指定了我必须加载的另一个资源的路径。我使用 URI.resolve（String）方法为此资源创建URI。这导致了一个问题，因为新创建的File资源不包含指示remotehost所必需的slahses。而不是

This file specifies a path to another resource that I have to load. I use the URI.resolve(String) method to create a URI to this resource. This is causing a problem because the newly create File resource doesn't contain the necessary slahses to indicate the remotehost. Instead of

file:////remotemachine/my/path/data.dat

我得到

file:///remotemachine/my/path/data.dat

缺少的斜杠表示文件正在尝试加载来自资源不存在的本地机器（路径也没有）。

The missing slash means the file is trying to be loaded from the local machine where the resource doesn't exist (nor does the path).

如果我使用IP地址而不是机器名，这会做同样的事情。如果我使用映射文件名，例如 file：/// M：/path/spec.txt 然后资源文件正确解析为 file：/// M：/ path / data .DAT 。此外，如果我使用http协议路径，URI会正确解析。

This does the same thing if I use IP addresses instead of machine names. If I use a mapped file name, e.g. file:///M:/path/spec.txt then the resource file correctly resolves to file:///M:/path/data.dat. Also if I use a http protocol path the URI resolves correctly.

如果这是一个错误，任何人都可以确定我是否有再次解析文件URI的误解Java？

Can anyone identify if I have a misunderstanding in resolving File URIs again network shares of if this is a bug in Java?

代码的相关部分

private Tile(URI documentBase, XPath x, Node n) throws XPathExpressionException, IOException
{
  String imagePath = (String) x.evaluate("FileName", n, XPathConstants.STRING);
  this.imageURL = documentBase.resolve(imagePath).toURL();
}

更新

我已经找到了解决问题的方法

I've come up with a fix for my problem

private Tile(URI documentBase, XPath x, Node n) throws XPathExpressionException, IOException
{
  boolean isRemoteHostFile = documentBase.getScheme().equals("file") &&
                             documentBase.getPath().startsWith("//");

  String imagePath = (String) x.evaluate("FileName", n, XPathConstants.STRING);
  imageURL = documentBase.resolve(imagePath).toURL();
  if ( isRemoteHostFile )
  {
    imageURL = new URL(imageURL.getProtocol()+":///"+imageURL.getPath());
  }
}

但是我仍然很好奇文件：东西是一个Java错误，一个URI问题，或者只是对我如何工作的一个很大的误解。

However I'm still curious if the File: thing is a Java bug, a URI problem or just a big misunderstanding of how it works on my part.

推荐答案

也许'文件： //remotemachine/my/path/data.dat？两个斜线，而不是四个。

Maybe 'file://remotemachine/my/path/data.dat'? Two slashes, not four.

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