Getting rid of file extensions?

Question

help to make such a thing (in the previous answer, I was told that I was poorly explained, and now try to explain poponyatneee) I have a form, just a form, the code it is:

<form action="searchf" method="Post">
<input type="text" name="text" autofocus >
<input type="submit" value="">
</form>

The user enters into this form different file names, such as: index.txt, hello.html (files with duplicate names not, and basically it will txt files). Next, the servlet takes string that the user enters:

String myName = request.getParameter("text");

Continue program called input files looking for the files in the folder, but the fact is that it is necessary to enter index.html program to find the file in the folder, not just index, here's help to enter the extension was not necessarily trying to do so :

String myNamee = request.getParameter("text");
String myName = myNamee.replaceFirst("[.][^.]+$", "");

It did not work (I will be glad to any replies

Eric Scot

I wrote that the program looks for the entered data in a specific directory — Eric Scot, Nov 14 '12 at 13:53
Side note: naming variables as `myNamee` and `myName` is a bad idea, very easy to use the wrong variable with a typo. Try `inputFileWithExt` and `inputFile`, for example. — Duncan Jones, Nov 14 '12 at 13:53
Are you expecting the user to give the filename with the extension? — Duncan Jones, Nov 14 '12 at 13:54
I'm still new to java, could you write the code please, of what you suggested) — Eric Scot, Nov 14 '12 at 13:55
Ok. So if the user *has* supplied the extension, then I don't think you have a problem. You can just search for files with that name. Java considers the extension to be part of the name (e.g. `foo.txt` is the full filename). — Duncan Jones, Nov 14 '12 at 13:58
When files can I print them immediately without the extension? — Eric Scot, Nov 14 '12 at 14:20

score 0 · Answer 1 · answered Nov 14 '12 at 13:50

0

Why not cut out everything from the last dot in the name to the end:

final String baseName = fileName.substring(0, fileName.lastIndexOf("."));

answered Nov 14 '12 at 13:50

Marko Topolnik

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Thank you'll try, you will not go away) – Eric Scot Nov 14 '12 at 13:51
'String myName = request.getParameter("text");final String baseName = myName.substring(0, myName.lastIndexOf("."));' – Eric Scot Nov 14 '12 at 14:09
Your version gave me this error – Eric Scot Nov 14 '12 at 14:14
java.lang.StringIndexOutOfBoundsException: String index out of range: -1 java.lang.String.substring(String.java:1937) searchf.doPost(searchf.java:26) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) – Eric Scot Nov 14 '12 at 14:14
2

So work on it. If there is no dot to begin with, this is the way it fails. – Marko Topolnik Nov 14 '12 at 14:15
just the name of my string - myName, please can do with it) – Eric Scot Nov 14 '12 at 14:17

score 0 · Accepted Answer · edited May 23 '17 at 11:43

0

If you need to separate the file extension from the filename, you can do something like this:

String file = request.getParameter("text");
String fileNoExt, fileExt = "";
if(file.indexOf(".") == -1) {
   fileNoExt = file;
else {
   fileNoExt = file.substring(0,file.lastIndexOf("."));
   fileExt  = file.substring(file.lastIndexOf(".")+1);
}

I recommend that you test this code outside the context of Servlets. Just create a simple Java program with a main method to search a directory for a file and you can forget the user-input and form info. Just hard code some test data to make sure you know how to look through a directory and your code to handle the filenames is working correctly.

You may find this other stack overflow question helpful for understanding how to serach through a directory for a file.

edited May 23 '17 at 11:43

Community

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answered Nov 14 '12 at 13:55

Thorn

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@EricScot - explain yourself. In what sense did it not work? What were the symptoms? What were the errors? – Stephen C Nov 14 '12 at 14:16
I tried to enter and hello.txt and hello, in both cases, I was given a white screen, so there is an error ( – Eric Scot Nov 14 '12 at 14:19
So what did the logfile say? – Stephen C Nov 14 '12 at 14:20
@EricScot - And did you test it outside of a servlet like Thorn suggested? – Stephen C Nov 14 '12 at 14:21
nothing 14.11.2012 17:07:36 org.apache.catalina.core.ApplicationContext log INFO: ContextListener: contextInitialized() 14.11.2012 17:07:36 org.apache.catalina.core.ApplicationContext log INFO: SessionListener: contextInitialized() 14.11.2012 17:13:52 org.apache.catalina.core.ApplicationContext log – Eric Scot Nov 14 '12 at 14:22
See, I realized what the problem is I have done it so it is necessary to output files from a directory without an extension and only then compare them with what the user entered) – Eric Scot Nov 14 '12 at 14:25
If you tested the file access code outside of a Servlet and it worked, then there is a problem with how you are looking for files in the Servlet. Post your Servlet code or just your doGet method. – Thorn Nov 14 '12 at 15:11

Getting rid of file extensions?

2 Answers2