Ok, here's the deal, as near as I can tell after trying your code with your URL. First of all, don't assume you got UTF-8. Always use whatever character encoding is in the HTTP response header. In your case, there's no actual encoding in the response header so you must fall back to some default.
This is where things get iffy. A number of sources recommend falling back to windows-1252, which does decode the apostrophe properly. The default for text/html is iso-8859-1 but iso-8859-1 does not decode that character properly. I cannot find any hard reference that windows-1252 should be the default for text/plain. However, nearly every example of a text/plain request I could find defaults to that encoding.
Therefore I can only conclude that it is, more often than not, a safe fallback. So I would say:. Grab the character set from the response header (or from your entity). If there isn't one and your content type is text/plain, default to windows-1252. If your content type is text/html default to iso-8859-1 (edit: or if you want to be even more robust, first decode the content as us-ascii, look for a character encoding in an html meta tag, then decode as that, otherwise iso-8859-1).
Specify that content type to the InputStream. Do not assume utf-8. Everything I have found so far indicates that the above covers the majority of cases. I will continue looking around for definitive sources.
In general when you want the browser to show the download dialog box for a file to be downloaded, you should set the incoming inputstream content directly into the response object steam and set the content type of response ( HttpServletResponse object) to the relevant file type. I.e., response.setContentType(. Relevant content type) Content type can be application/pdf for pdf files as an example.
If browser has a plugin to show relevant file in the browser window, file will open and user can save then, otherwise browser will show the download box.
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Java Httpclient Maven
Give a try: URL website = new URL('ReadableByteChannel rbc = Channels.newChannel(website.openStream); FileOutputStream fos = new FileOutputStream('information.html'); fos.getChannel.transferFrom(rbc, 0, Long.MAXVALUE); Using transferFrom is potentially much more efficient than a simple loop that reads from the source channel and writes to this channel. Many operating systems can transfer bytes directly from the source channel into the filesystem cache without actually copying them. Check more about it.
Java Download File From Url
Note: The third parameter in transferFrom is the maximum number of bytes to transfer. Integer.MAXVALUE will transfer at most 2^31 bytes, Long.MAXVALUE will allow at most 2^63 bytes (larger than any file in existence). I have an unit test that reads a binary file with 2.6TiB. Using Files.copy it always fails on my HDD storage server (XFS) but it fails only a few times my SSH one. Looking at JDK 8 the code of File.copy I've identified that it checks for ' 0' to leave the 'while' loop. I just copied the exactly same code with the -1 and both unit tests never stopped again.
Once InputStream can represent Network and local file descriptors, and both IO operations are subject to OS context switching, I cant see why my claim is baseless. One may claim it be working by luck, but it gave no headaches any more. – Jul 6 '16 at 16:50.
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