How to upload a text file to a webpage and process it using a Java app?

Apologies if the question is off topic.
I would like a user to upload a text file to a webpage and have a pre-existing Java application I created process the text file and return the results to the user. The Java application is fairly memory intensive. It is expected that multiple clients will be uploading at the same time. What is the simplest or most efficient method to achieve this?
Thank you

This might help you to get started: http://www.roseindia.net/jsp/file_upload/Sinle_upload.xhtml.shtml
As done in this example, processing the uploaded file in the JSP itself may not be a good idea though. You're better off handling it in your controller servlet or action class.

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http://diocio.wordpress.com/2007/02/12/sap-upload-excel-document-into-internal-table/
check the link
TYPES: Begin of t_record,
name1 like itab-value,
name2 like itab-value,
age   like itab-value,
End of t_record.
DATA: it_record type standard table of t_record initial size 0,
wa_record type t_record.
DATA: gd_currentrow type i.
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*START OF SELECTION
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exporting
filename                = p_infile
i_begin_col             = 1′
i_begin_row             = 2′ Do not require headings
i_end_col               = 14′
i_end_row               = 31′
tables
intern                  = itab
exceptions
inconsistent_parameters = 1
upload_ole              = 2
others                  = 3.
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Sort table by rows and colums
sort itab by row col.
Get first row retrieved
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Set first row retrieved to current row
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loop at itab.
Reset values for next row
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clear wa_record.
gd_currentrow = itab-row.
endif.
case itab-col.
when 0001′.                              First name
wa_record-name1 = itab-value.
when 0002′.                              Surname
wa_record-name2 = itab-value.
when 0003′.                              Age
wa_record-age   = itab-value.
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endloop.
append wa_record to it_record.
*!! Excel data is now contained within the internal table IT_RECORD
Display report data for illustration purposes
loop at it_record into wa_record.
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(10) wa_record-name2, sy-vline,
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*& Report ZUPLOADTAB                                                  *
*& Example of Uploading tab delimited file                             *
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name1(10) type c,
name2(15) type c,
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DATA: wa_string(255) type c.
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START-OF-SELECTION.
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END-OF-SELECTION.
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Hi all,
I am trying to create a text file at the given path and delete the created file after the use.
I am using following code.:
import java.io.*;
// write binary data as characters
public class RanIO {
                                        public static void main(String f[])
                                                  // First illustrate append
                                                  String lineSep = "\n";
                                                  try {
                                                                 File temp= new File("C:/Ash","cute.txt");
                                                  boolean ch=temp.createNewFile();
                                                  if(ch)
                                                       System.out.println("file created");
                                                  else
                                                  System.out.println("file Not created");
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                                             /*     PrintWriter p = new PrintWriter(new BufferedWriter(new FileWriter("cute.txt",true)));
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                                                                           FileWriter fos = new FileWriter(temp, true);
                                                                           BufferedWriter bw = new BufferedWriter(fos);
                                                                           PrintWriter pw = new PrintWriter(fos);
                                                                           double d=550;
                                                                      // lineSep = System.getProperty("line.separator");
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                                                  System.out.println("File deleted");
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                                                  System.out.println("File not deleted");
                                             } catch (IOException ioe)
                                                            System.out.println( "Append IO error:" + ioe );
My problem:
1)
I am not able to write to the file. I want to know, where i am going wrong.
It is giving error message like
"Canot resolve Symbol: temp,"
But, FileWriter Constructor should accept a File type parameter.
here temp is a file parameter.
If i am not using file=new file();
i can't delete the file after the use. i.e if i use
PrintWriter p = new PrintWriter(new BufferedWriter(new FileWriter("cute.txt",true)));
how can i delete cute.txt after the use?
2)
I am not able to write to the text file. file is created but, a blank file.
"Hello" is not written into the text file.
can anyone help me in this regard
Thanks in advance
Ashvini

Thank you Ram,
But, i want to create a text file in Append mode.
for that i used
FileWriter fos = new FileWriter(temp,true); But, it is not accepting FileWriter constructor in
this format. if i use
FileWriter fos = new
FileWriter("c:/ash/cute.txt",true); it works fine. !!!!!Here's the javadoc
public FileWriter(File file,
boolean append)
throws IOExceptionConstructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.
Parameters:
file - a File object to write to
append - if true, then bytes will be written to the end of the file rather than the beginning
Throws:
IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason
Since:
1.4
Are you using jdk.13 or lower ?
>
ONe more doubt, Does flush method deletes a file?
if not, then i need to use
File temp=new File("c:/ash/cute.txt");
FileWriter fos = new FileWriter(temp,true); //which
is again a problem
if(temp.delete())
out.println("File is deleted");
}I don't know whether i am taking it wrong ! or
anything wrong with my coding ! but, after creating
and writing data into a text file. I must delete it
as it contains confidential informations.
Regards,
Thanks.'flush' writes to a file immediately. Else you should explicitly call 'flush' to write contents from buffer to underlying source.
javadoc again
PrintWriter
public PrintWriter(Writer out,
boolean autoFlush)Create a new PrintWriter.
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cheers,
ram.
Question; What do you gain by opening a file, writing to it and deleting it in the same program ?

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Hope this helps
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out.close();
}

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