Change encoding of a file with grails - grails

Question

In my view i have a upload form:
<input type="file" name="file" value="search file" /><br />
In my controller I load it like that:
def file = request.getFile('file')
def f = file.getInputStream()
def input = f.getText()
So I have now a String called input with the content of the file.
I want it in UTF-8. How is this possible ?
Edit:
My problem is, that the file to be uploaded is in "Windows-1252" and German characters like äöü are different now in the string called "input".
If i convert the file with "Notepad++" in UTF-8 and then upload it, it works. But I cant do that every time.
Edit2:
def file = request.getFile('file') //get file from view
def File tmpfile = new File('C:/tmp/tmpfile.txt') //create temporary file
file.transferTo(tmpfile) //copy into tmpfile
CharsetToolkit toolkit = new CharsetToolkit(tmpfile) //toolkit with tmpfile
def charset = toolkit.getCharset() //save charset in a variable
def input = tmpfile.getText(charset) //get text with right charset
I tried this with a few different documents. But the variable charset is always UTF_8

Answer 1

You can use getText(String charset)
def input = f.getText('UTF-8')

Answer 2

I found a solution:
I used java-bib called jUniversalChardet and wrote the following method:
String getEncoding ( def inputstream ) {
def byte[] buf = new byte[4096]
def UniversalDetector detector = new UniversalDetector(null)
def nread
while ((nread = inputstream.read(buf)) > 0 && !detector.isDone()) {
detector.handleData(buf, 0, nread)
}
detector.dataEnd();
def encoding = detector.getDetectedCharset()
return encoding
}
In my code i have the following now:
def file = request.getFile('file')
def f = file.getInputStream()
def encoding = getEncoding(file.getInputStream())
def input = f.getText(encoding)
And it works :)