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Search through the text file and display on a GUI..

Posted on 2004-08-24
9
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Last Modified: 2010-03-31
Hi,

I have a text file that contain the Employee Name, Address, and so on.  I'm writing a program to search this text file for a specific name and display on a GUI.  I'm able to make it to work, but now the problem I have is if the name is duplicate, I want to display it record by record and I want to be able to move back and forth.  Right now, I have a search button, when I click on it, it will call the searchName function which perform the search.  Once it reach end of file, I have no way to rewind it so it can go back to search from the beginning.  Please help!

Thanks!

public void searchName()
{
         String strName, strName2Search;

         if (oRAF == null)
         {
            try
            {
               oRAF = new RandomAccessFile("C:/Temp/Employee.txt", "rw" );
            }
            catch(IOException e)
            {                              
               System.err.println( "File not opened properly\n" + e.toString() );
               System.exit(1);
            }      
         }
                  
         try
         {
            strName2Search = txtName.getText();
            strName = oRAF.readUTF();
            ...
            strName2Search = strName2Search.trim();
            strName = strName.trim();
            if (strName2Search.equalsIgnoreCase(strName))
            {
      txtName.setText(strName);
      ...
            }
         }
         
         catch(EOFException e2)
         {
            System.err.println("End Of File.");
         }
         catch(IOException e2)
         {
            System.err.println("Error reading file");
            System.exit(1);
         }
      }
0
Comment
Question by:TommyN14
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9 Comments
 
LVL 92

Expert Comment

by:objects
ID: 11889420
oRAF.seek(0);
0
 
LVL 1

Author Comment

by:TommyN14
ID: 11889522
Hi,

Where do I add that code in?  I tried it in the Catch, and it gave me a compile error
SearchEmp.java:187: unreported exception java.io.IOException; must be caught or declared to be thrown
output.seek(0);

Thanks!
0
 
LVL 92

Expert Comment

by:objects
ID: 11889551
add it where you need to rewind to the beginning of the file.
0
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LVL 86

Expert Comment

by:CEHJ
ID: 11889784
If you only have a reasonably small file, you could hold each Employee as an object in memory and display/navigate with ease. Make an Employee class and create instances from the fields
0
 
LVL 1

Author Comment

by:TommyN14
ID: 11895922
Well, I would like to do it as soon as the file has reach the end so the next time they click on Search again, it will go to the beginning.

try
         {
            strName2Search = txtName.getText();
            strName = oRAF.readUTF();
            ...
            strName2Search = strName2Search.trim();
            strName = strName.trim();
            if (strName2Search.equalsIgnoreCase(strName))
            {
     txtName.setText(strName);
     ...
            }

Some where in the try but i don't know how.

Thanks!
0
 
LVL 92

Accepted Solution

by:
objects earned 100 total points
ID: 11898177
put it at the end in a finally block, that way you can be sure it occurs

        catch(EOFException e2)
         {
            System.err.println("End Of File.");
         }
         catch(IOException e2)
         {
            System.err.println("Error reading file");
            System.exit(1);
         }
         finally
         {
             try
             {
                 oRAF.seek(0);
             }
             catch (IOException ex)
             {
                System.err.println("Error rewinding file");
             }
         }
0
 
LVL 1

Author Comment

by:TommyN14
ID: 11898341
objects,

Thanks for your help.  This 100 pts will be granted to you.  I also have another question related to this.  I'll increase pts to 300 total if you can help.  Here is the question.  If i click on the Search button, I want to be able to search through the text file for all matching data, if only one entry was found, then display on the same screen. ( This part is done already)  But if there are more than one entry, I want to pops up another window display all the entries, and when I click on each entry from a new window, It will display the correct data on the Search window.
Please help.  Thanks!
0
 
LVL 92

Expert Comment

by:objects
ID: 11898382
keep track of how many matches you have found and create a new frame for all matches >1
0
 
LVL 1

Author Comment

by:TommyN14
ID: 11898529
Could you please give me some sample codes?  Thanks!
0

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