Reading and writing to a text file from an Applet

I'm a novice java programming with very little formal programming training. I've pieced together enough knowledge to do what I've wanted to do so far...
However, I've been unable to figure out how to read and write to a text file from an Applet (I can do it from a normal java program just fine). Here is a simple example of what I'd like to do (you can also look at it on my website: www.stat.colostate.edu/~leach/test02/test02.html). I know that there is some problem with permission/security but I'm not smart enough to understand what the error messages are telling or understand the few books I have. If anyone can tell me how to get this applet to work, or direct me to some referrences that would help me out I'd really appreciate it.
Thanks,
Andy
import java.applet.Applet;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
public class test02 extends Applet {
public Button B_go;
public GridBagConstraints c;
public void init() {
this.setLayout(new GridBagLayout());
c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH;
B_go = new Button("GO");
c.gridx=1; c.gridy=0; c.gridwidth=1; c.gridheight=1;
c.weightx = c.weighty = 0.0;
B_go.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
print_stuff();
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
this.add(B_go,c);
public static void print_stuff() {
try{
File f = new File("test02.txt");
PrintWriter out = new PrintWriter(new FileWriter(f));
out.print("This is test02.txt");
out.close();
}catch(IOException e){**/}
}

I have almost the exact same problem, and I am in the same situation as you are with respects to the language.
I am simply trying to create a file and output some garbage to it but my applet always spits back a security violation. I've tried eliminating the restrictions on the applet runner I use but I still get the error.
My method:
debug = new Label() ;
debug.setLocation( 20, 20 ) ;
debug.setSize( 500, 15 ) ;
add( debug ) ;
// output
try
     OutputStream file = new FileOutputStream( new File( "" + getCodeBase() + "output.txt" ) ) ;
     byte[] buffer = { 1, 2, 3, 4, 5 } ;
     file.write( buffer ) ;
     file.close() ;
} catch( Exception e )
     debug.setText( e.toString() ) ;
     Can anyone tell why this isnt working?

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Thanks for your help.
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outfile utl_file.file_type;
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utl_file.fflush(outfile);
EXCEPTION
WHEN no_data_found THEN
EXIT;
END;
END LOOP;
END IF;
utl_file.fclose(infile);
utl_file.fclose(outfile);
EXCEPTION
WHEN OTHERS THEN
raise_application_error(-20099, 'Unknown UTL_FILE Error');
END my_app2;
When I run this code I only get one line: DE4.2 I AM MISSING THE ENTIRE PARAGRAPH
PLEASE ADVISE...

Hi,
Look at where you're calling utl_file.put_line. The only time you're writing anything is immediately after you find the the key word 'DE4', and then you're writing just that line.
You need to store the entire paragraph, and when you reach the end of the paragraph, write the whole thing only if you found the key word, like this:
CREATE OR REPLACE PROCEDURE my_app2 IS
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              WHEN no_data_found THEN
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--EXCEPTION
--    WHEN OTHERS THEN
--        raise_application_error(-20099, 'Unknown UTL_FILE Error');
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Remember that anything inside quotes is case-sensitive. If your file contains upper-case 'FOO', then it won't be "LIKE 'foo%' ".
Edited by: Frank Kulash on Dec 7, 2011 1:35 PM
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Problem on reading and writing from from a *.txt file

I get Problem on reading and writing from from a *.txt file. The following is the read() method...
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Attachments:
1.png ‏11 KB

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Hi,
Iam with Problem in reading no. of files and writing into a single file....
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import java.io.*;
import java.util.regex.*;
import java.util.*;
import java.text.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
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          rowTitle.createCell((short)2).setCellType(HSSFCell.CELL_TYPE_STRING);
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          rowTitle.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)6).setCellValue("Data Size");
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while((aLine=logReader.readLine()) != null) {
if(aLine.startsWith("<MESSAGE TYPE=\"EVENT\"")) {
Matcher m = startMessage.matcher(aLine);
if(m.find()) {
sBuf.setLength(0);
sBuf.append(aLine);
skip = false;
initReq = false;
m = initMessage.matcher(aLine);
if(m.find()) {
initReq = true;
} else {
if(initReq) {
m = initResMessage.matcher(aLine);
if(m.find()) {
sBuf.setLength(0);
sBuf.append(aLine);
skip = false;
} else if(aLine.startsWith("</MESSAGE>")) {
if(!skip) {
sBuf.append(aLine);
readed = true;
} else if(!skip){
sBuf.append(aLine);
if(!skip && readed) {
String tempStr = sBuf.toString();
if(tempStr.length() > 0) {
boolean reqMatched = false;
Matcher m = null;
if(initReq) {
m = initMessage.matcher(tempStr);
actName = "Intialization";
} else {
m = requestMessage.matcher(tempStr);
String time = "";
if(m.find()) {
reqMatched = true;
for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
if(i == 1) {
time = groupStr;
} else if(i == 2) {
actName = groupStr;
} else if(!initReq){
m = requestMessage1.matcher(tempStr);
if(m.find()) {
reqMatched = true;
for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
if(i == 1) {
time = groupStr;
} else if(i == 2) {
actName = groupStr;
if(time.length() > 0 ) {
try{
requestTime = sdf.parse(time).getTime();
}catch(Exception ex){}
System.out.println("Request,"+actName+","+time+",,,,"+dcf.format(((double)time.length()/1024.0))+"K");
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                                   rowReq.createCell((short)4).setCellValue("");
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                                   rowReq.createCell((short)5).setCellValue("");
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                         Matcher k = rcvdMessage.matcher(tempStr);
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try{
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}catch(Exception ex){}
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                                             try{
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}catch(Exception ex){}
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if(!reqMatched) {
if(initReq) {
m=initResIDMessage.matcher(tempStr);
} else {
m=responseMessage.matcher(tempStr);
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for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
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}catch(Exception ex){}
                                             String resDataSize = dcf.format(((double)tempStr.length()/1024.0))+"K" ;
                                             rowRes = sheet.createRow((short)(counter));
                                             rowRes.createCell((short)0).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)0).setCellValue("Response");
                                             rowRes.createCell((short)1).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)1).setCellValue(actName);
                                             rowRes.createCell((short)2).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)2).setCellValue(groupStr);
                                             rowRes.createCell((short)3).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)3).setCellValue((responseTime - requestTime));
                                             rowRes.createCell((short)4).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)4).setCellValue(hasTime);
                                             rowRes.createCell((short)5).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)5).setCellValue(hasCalls);
                                             rowRes.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)6).setCellValue(resDataSize);
                                             hasTime = 0;
                                             hasCalls = 0;
                                             counter = counter + 1 ;
sBuf.setLength(0);
readed = false;
          wb.write(fileOut);
          } // End of for (int fileNo = 0; fileNo < children.length; fileNo++ )
}     //End of else
          fileOut.close();
} //End of public static void main
} // End of Class

First of all, use [code]-tags to make your code readable, please.
I didn't do a complete inspection of your code (because it's too much and unreadable as it is) and I don't know POI, but creating a new HSSFWorkbook for each input file sounds fishy to me ... try re-using the workbook and just creating a new sheet in each iteration.

What are some of the best iOS apps can remotely played videos, audios, photos and text files from a NAS hdd connected to Airport Extreme USB port? And how to configure this setup?

I have already set up NAS hdd as connecting it at USB port of Airport Extreme, i also want to remotely access it from iPhone, so what's the next step? What are some of the best iOS apps can remotely played videos, audios, photos and text files from the NAS hdd and how to configure this setup?

*Edit - I am not able to connect to the NAS when hardwired to the airport extreme.

Reading text file from database server in OA Page

Hi Guys,
I am trying to embed an applet with in an OA Page. The applet is used to mainly for showing Gantt chart. I have to pass my connection details from OA Page to applet, I dont pass directly the connection details to the applet so i am placing all the server details, user name and password in a text file on the database server.
So from the OA Page i have to read the contents of the file on the database server and pass them to the applet using the <PARAM> tag. My question is how to read the text file from the database server.Any Inputs?
Thanks in advance for your help.
Regards,
Nagesh Manda.

If the file to be read is on the database, then it makes sense to use the pl/sql code to read the file. Make a call to this pl/sql code from page controller to get back the values.
--Shiv

File importer detected an inconsistency in the file stucture of (file name). Reading and writing this file's metadata (XMP) has been disabled.

I have duplicated a project to work on another computer. The project opens fine but when I import new footage/audio files I get this message. "File importer detected an inconsistency in the file stucture of (file name). Reading and writing this file's metadata (XMP) has been disabled." Then I can't play my timeline and Premier Pro crashes. I have to force quit and restart my computer to continue working. What does this error really mean? How do you rectify?
Our workflow requires that we duplicate projects to make updates because we are frequently revising but need to keep original project unchanged and intact.

I have a similar issue and message , but occurs when I import AVI clips from OnLocation CS4 to Premier Pro CS4.

How can I read text files from LAN if I only know the hostname?

I'm new in Java Developing, and dont know the written classes yet. I need help, how to do the following steps?
<p>1. How can I read text files from LAN if I only know the hostname, or IP address?
<p>2. How to read lines from text files without read all lines from the beginning of file, just seek to a position.
(ex. how can I read the 120th line?)
<p>Please help!
<p>sorry for the bad english

I'm new in Java Developing, and dont know the written classes yet. I need help, how to do the following steps?
1. How can I read text files from LAN if I only know the hostname, or IP address?You need to know the URL of the file. You need to know the hostname, port, protocl and relative path.
The hostname is server, not file.
2. How to read lines from text files without read all lines from the beginning of file, just seek to a position.Use the seek() to get to a random byte.
(ex. how can I read the 120th line?)The only way to find the 120th line is to read the first 120 lines. You can use other file formats to find the 120th line without reading the whole file but to need to be able to detremine where the 120th line is

Read a text file from DB directly (don't use PLSQL).

how can I Read a text file from DB directly (don’t use PLSQL). ?

If there is a known structure, you could use External Table access and query that "file" as any table.
Nicolas.

Reading certain lines of a text file and boundary testing ...

Hi all,
This is only my second post so please be gentle ;P
Basically, my problem is that i want to read certain chunks of a text file into different text boxes. For example, this may be 50 lines in textbox1, then 50 in textbox2, then the rest in textbox3. i know this would involve using a splitter, but i have absolutelyno
idea how i would go about implementation this. any help would be greatly appreciated on this.
my second problem is that i also need to carry out testing on my system. one page in this is the login page. I understand that normal data would be all correct fields and erroneous data would be blank field(s). however, i dont really know what would be boundary
testing for this. The only thing i could think of is correct username but incorrect password but i dont think this is correct. again, any help would be appreciated.
thanks,
LTID

Hi all,
This is only my second post so please be gentle ;P
Basically, my problem is that i want to read certain chunks of a text file into different text boxes. For example, this may be 50 lines in textbox1, then 50 in textbox2, then the rest in textbox3. i know this would involve using a splitter, but i have absolutelyno
idea how i would go about implementation this. any help would be greatly appreciated on this.
my second problem is that i also need to carry out testing on my system. one page in this is the login page. I understand that normal data would be all correct fields and erroneous data would be blank field(s). however, i dont really know what would be boundary
testing for this. The only thing i could think of is correct username but incorrect password but i dont think this is correct. again, any help would be appreciated.
thanks,
LTID
I suppose there would be a reason for needing to read some amount of lines into each textbox. But you make no mention of why that would be necessary.
There is such a thing as a delimited text file. Each line would contain a delimiter of some character between fields on each line. That file could be used for displaying information in separate controls on a Form.
But you only mention TextBox's and reading x amount of lines from a file into each TextBox as if you are perhaps providing certain information for each TextBox.
If that is what you want then provided replies will work. If you want to explain what you need to do with regard to information in a file and displaying it otherwise then please explain so that a better method could be provided.
Example using Text Field Parser.
https://msdn.microsoft.com/en-us/library/microsoft.visualbasic.fileio.textfieldparser(v=vs.110).aspx
Option Strict On
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.Location = New Point(CInt((Screen.PrimaryScreen.WorkingArea.Width / 2) - (Me.Width / 2)), CInt((Screen.PrimaryScreen.WorkingArea.Height / 2) - (Me.Height / 2)))
Using MyReader As New Microsoft.VisualBasic.FileIO.TextFieldParser("c:\Users\John\Desktop\DelimitedTextFile.Txt")
MyReader.TextFieldType = Microsoft.VisualBasic.FileIO.FieldType.Delimited
MyReader.Delimiters = New String() {"|"}
Dim currentRow As String()
While Not MyReader.EndOfData
Try
currentRow = MyReader.ReadFields()
ListBox1.Items.Add(currentRow(0))
ListBox2.Items.Add(currentRow(1))
ListBox3.Items.Add(currentRow(2))
Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
MsgBox("Line " & ex.Message & " is invalid. Skipping")
End Try
End While
End Using
End Sub
End Class
Text in text file DelimitedTextFile.Txt. Delimiter is vertical bar.
Bill|Home Depot|Garden Department
Cheryll|DirectTV|Installer
Charlie|C&K Automotive|Owner
Zorro|Television|Masked Avenger
Samantha|Mayo Clinic|Nurse Practitioner
Mona|Bahia Honda Key State Park|Park Ranger
La vida loca

Reading and Writing large Excel file using JExcel API

hi,
I am using JExcelAPI for reading and writing excel file. My problem is when I read file with 10000 records and 95 columns (file size about 14MB), I got out of memory error and application is crashed. Can anyone tell me is there any way that I can read large file using JExcelAPI throug streams or in any other way. Jakarta POI is also showing this behaviour.
Thanks and advance

Sorry when out of memory error is occurred no stack trace is printed as application is crashed. But I will quote some lines taken from JProfiler where this problem is occurred:
          reader = new FileInputStream(new File(filePath));
          workbook = Workbook.getWorkbook(reader);
          *sheeet = workbook.getSheet(0);* // here out of memory error is occured
           JProfiler tree:
jxl.Workbook.getWorkBook
      jxl.read.biff.File
             jxl.read.biff.CompoundFile.getStream
                   jxl.read.biff.CompoundFile.getBigBlockStream Thanks

Reading and writing to a text file from an Applet

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