Reading Each String From a text File

Hello everyone...,
I've a doubt in File...cos am not aware of File.....Could anyone
plz tell me how do i read each String from a text file and store those Strings in each File...For example if a file contains "Java Tchnology forums, File handling in Java"...
The output should be like this... Each file should contains each String....i.e..., Java-File1,Technology-File2...and so on....Plz anyone help me

The Java� Tutorials > Essential Classes: Basic I/O

Similar Messages

Reading one line from a text file into an array

i want to read one line from a text file into an array, and then the next line into a different array. both arays are type string...i have this:
public static void readAndProcessData(FileInputStream stream){
     InputStreamReader iStrReader = new InputStreamReader (stream);
     BufferedReader reader = new BufferedReader (iStrReader);
     String line = "";
     try{
     int i = 0;
          while (line != null){
               names[i] = reader.readLine();
               score[i] = reader.readLine();
               line = reader.readLine();
               i++;
          }catch (IOException e){
          System.out.println("Error in file access");
this section calls it:
try{
     FileInputStream stream = new FileInputStream("ISU.txt");
          HighScore.readAndProcessData(stream);
          stream.close();
          names = HighScore.getNames();
          scores = HighScore.getScores();
     }catch(IOException e){
          System.out.println("Error in accessing file." + e.toString());
it gives me an array index out of bounds error

oh wait I see it when I looked at the original quote.
They array you made called names or the other one is prob too small for the amount of names that you have in the file. Hence as I increases it eventually goes out of bounds of the array so you should probably resize the array if that happens.

How to read every line from a text file???

How can i read every line from my text file ("eka.txt")
now it only reads the first line and prints it out.
What is wrong with this?
import java.io.*;
import java.util.*;
class Testi{
     public static void main(String []args)throws IOException {
     BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
File inputFile = new File ("eka.txt");
FileReader fis =new FileReader(inputFile);
BufferedReader bis = new BufferedReader(fis);
String test=bis.readLine();
String tmp= "";
while((bis.readLine().trim() != null)) {
int spacefound=0;
int l=test.indexOf(" ");
     for(int i=0;i<test.length();i++){
     char c=test.charAt(i);
     if(c!=' ') tmp+=""+c;
     if(c==' ' && (spacefound<1) && !(tmp.equals(""))){
     tmp+=""+c;
     spacefound++;
     if(tmp.length()==l) {
     System.out.println(tmp);
     tmp="";
     spacefound=0;
     if(tmp.length()<l){
     for(int i=0;i<=(l-tmp.length());i++)
     tmp+=""+' ';
     System.out.println(tmp);

Try this code, Hope it servers your purpose.
import java.io.*;
import java.util.*;
class Testi {
     public static void main(String []args)throws IOException {
          BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
          File inputFile = new File ("Eka.txt");
          FileReader fis =new FileReader(inputFile);
          BufferedReader bis = new BufferedReader(fis);
          String test=bis.readLine();
          while(test != null) {
               StringTokenizer st = new StringTokenizer(test," ");
               while(st.hasMoreTokens())
                    System.out.println(st.nextToken());
               test = bis.readLine();
}Sudha

How to read some lines from a text file using java.

hi,
i m new to java and i want to read some lines from a text file based on some string occurrence in the file. This file to be read in steps.
we only want to read the file upto the first Occurrence of "TEXT" string.
How to do it ,,,
Kinldy give the code
Regards,
Sagar
this is the text file
dfgjdjj
sfjhjkd
ghjkdg
hjkdgh TEXT
ikeyt
ujt
jk
tyk TEXT
rukl
r

Hendawy wrote:
Since the word "TEXT" is formed of 4 letters, you would read the text file 4 bytes by four bytes. Wrong on two counts. First, the file may not be encoded 1 byte per character. It could be utf-16 in which case it would be two byte per character. Second, even if it were 1 byte per character, the string "Text" may not start on a 4 byte boundary.
Consider a FileInputStream object "fis" that points to your text file. use fis.read(byte[] array, int offset, int len) to read every four bytes. Convert the "TEXT" String into a byte array "TEXT".getBytes(), and yous the Arrays class to compare the equality of the read bytes with your "TEXT".getBytes()Wrong since it relies on my second point and will fail when fis.read(byte[] array, int offset, int len) does not read 4 bytes (as is no guaranteed to). Check the Javadoc. Also, the file may not be encoded with the default character encoding.
The problem is easily solved by reading a line at a time using a BufferedReader wrapping an InputStreamReader wrapping a FileInputStream and specifying the correct character encoding.
Edited by: sabre150 on Apr 29, 2009 2:13 PM

How do i read complete line from a text file in j2me?????

how do i read complete line from a text file in j2me????? I wanna read file line by line not char by char..Even i tried with readUTF of datainputstream to read word by word but i got UTFDataFormatException.. Please solve my problem.. Thanks in advance..

That is not my problem . i already read it char by char.. i am getting complete line..But this process is taking to much time..So thats why i directly wanna read complete line or word to save time..

Reading each value from spreadsheet file with delay (multiple rows and columns)

Hi,
a) I want to read EACH VALUE from a spreadsheet file having multiple rows and columns WITH DELAY. I am attaching my VI and sample datalog file for reference (tempsensor.txt).I need to do so because as soon as I read put ON the Sensor button on front panel, LV reads all the values at one go. I need the values for each temperature to be displayed after a delay.
b) Secondly, I would like to read another file containing the state of four antennas (deployed:1; undeployed:0). I am logging state of each antenna in each column of the file(magnet.txt) I need to have four LEDS on front panel to display state of the antennas. I dont know what I have done for antennas in my VI is right or wrong. I guess thats rhe wrong way to approach the problem. Please help!!!(column1: Antenna1 state ; Column2:Antenna2 state.. and so..on..)
Any help would be greatly appreciated!!
Thanks in advance,
Ratnesh
FYI: The first column in my datalog file represents timestamp(number of seconds elapsed), second column: reading for temperature sensor 1, third column: reading for temperature senosr 2, and so on. I am using approx. 11 temperature sensors.
Also, I have generated the log files for the reference purpose only. They do not represent the actual values. They are far away from actual values.
Attachments:
01032005.zip ‏30 KB

Look at this modified version of your VI. After looking at it, I determined that a shift reggister was not required in this case.
Lynn
Attachments:
MultiSensors.2.vi ‏85 KB

Reading in integers from a text file

Hi, I am going to go for the 'reading in from a text file' action as I haven't done this before. So I have been looking at all the examples and am trying the one out below :) My question is that though the structure seems pretty straightforward, what is the action of the 'token' and why doesn't java recognise it as it is used in many different examples that I have seen?
public static int[] getIntegersFromFile(String fileName) throws IOException {
               StringWriter writer = new StringWriter();
               BufferedReader reader = new BufferedReader(new FileReader(fileName));
               List<Integer> list = new ArrayList<Integer>();
               for (String line = reader.readLine(); line != null; line = reader.readLine()) {
               writer.write(line + " ");
               StringTokenizer tokens = new StringTokenizer(writertoString());
               while (tokens.hasMoreTokens()) {
                    String str = tokens.nextToken();
                    try {
                         list.add(new Integer(str));
                         } catch (NumberFormatException e) {
                              System.out.println("Error '" + str + "' is not an integer.");
               int[] array = new int[list.size()];
                    for( int i = 0; i < array.length; i++){
                    array[i] = list.get(i);
               return array;
     }

Hey, first of all, a piece of advice, try formatting your codes you make easier
to understand for the people who help you. You can check out the
formatting tips
Now, A think that could help you a lot, is the next link, seek out the
documentation for the StringTokenizer class
http://java.sun.com/j2se/1.5.0/docs/api/
Here your code formated and later my interpretation of your question.
public static int[] getIntegersFromFile(String fileName) throws IOException {
   StringWriter writer = new StringWriter();
   BufferedReader reader = new BufferedReader(new FileReader(fileName));
   List<Integer> list = new ArrayList<Integer>();
   for (String line = reader.readLine(); line != null; line = reader.readLine()) {
      writer.write(line + " ");
   StringTokenizer tokens = new StringTokenizer(writertoString());
   while (tokens.hasMoreTokens()) {
      String str = tokens.nextToken();
      try {
         list.add(new Integer(str));
      } catch (NumberFormatException e) {
         System.out.println("Error '" + str + "' is not an integer.");
   int[] array = new int[list.size()];
   for( int i = 0; i < array.length; i++){
      array = list.get(i);
   return array;
}StringTokenizer separates the string contained by the space character, and
each piece of the separated string is stored into the token.
Further on, could you extend your question about "why doesn't Java
recognize what?" please, because I don't know if you have a problem
iterating or is just that it doesn't compile or what.
Expecting your answer, to complete mine, cya around.
-Best Regards.

Reading parameters lists from a text file

Hi All,
Using CR XI R2 with VB6 and external .rpt files - - - - -
In a VB6 app I use VB to loop through my tables to create dynamic parameter lists (CR XI is limited to the number of parameters it can create from the table). This works well but each time the user refreshes the report the same code is run to re-create the parameter list which is redundant and slows down the report(s).
Is it possible to manually create a series of text files - say each morning - and then read the parameter lists from the text file(s) at runtime instead of doing it on the fly each time?
Thanks in advance!
Peter Tyler
Geneva - Switzerland

I find this sentence confusing:
Is it possible to manually create a series of text files - say each morning - and then read the parameter lists from the text file(s) at runtime instead of doing it on the fly each time?
Typically, runtime means on the fly - I think...
So, I'm not sure if you are trying to read a saved data report and filter that saved data so that you do not have to hit the database(?).
Creating a text file is beyond the support of this forum, though that should be a trivial exercise. Reading a text file and passing the results to a parameter is the same thing you are doing already, so I'm not sure where the hang up would be here(?)
Or - rather than creating a text file, why not create a temp table and query it as you do when you loop through the tables to create dynamic parameter lists(?).
I'm pretty lost here...
Ludek
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At end of tether! Reading in variables from a text file

Hi all
My stress factor has gone through the roof because I am trying to read in from a text file (you may have seen some earlir questions about ArrayLists) it's just not working!
The code is below. The result is that it's reading in all of the car data, none of the motorbike and only the first line for the services. It's odd and it's driving me insane!
Here's an example of the data it's reading. There are about 7-10 sets of data per type
<car><reg>AB04CDE</reg><make>Ford</make><model>Fiesta</model><colour>blue</colour><passenger_no>4</passenger_no></car>
<service><service_no>13570</service_no><reg>J605PLE</reg><date>15:07:2006</date><miles>20000</miles><part_replaced>brake_pads</part_replaced><part_replaced>front_tyres</part_replaced></service>
<motorbike><reg>TT05EKJ</reg><make>Triumph</make><model>Speedmaster</model><colour>black</colour><load>20.50</load></motorbike>
Here's the code
while (moreToRead) {
        String line;
        try {
          line = fileReader.getNextStructure();
// collect the data from the file
          if (line.indexOf("<car>")> -1){
            // Select/Extract the registration element
            int nStart = line.indexOf("<reg>");
            int nEnd = line.indexOf("</reg>");
            String reg = line.substring(nStart+5,nEnd);
            // Select/Extract the make element
            nStart = line.indexOf("<make>");
            nEnd = line.indexOf("</make>");
            String make = line.substring(nStart+6,nEnd);
            // Select/Extract the model element
            nStart = line.indexOf("<model>");
            nEnd = line.indexOf("</model>");
            String model = line.substring(nStart+7,nEnd);
            // Select/Extract the colour element
            nStart = line.indexOf("<colour>");
            nEnd = line.indexOf("</colour>");
            String colour = line.substring(nStart+8,nEnd);
            // Select/Extract the passenger_no element
            nStart = line.indexOf("<passenger_no>");
            nEnd = line.indexOf("</passenger_no>");
            String passenger_no = line.substring(nStart+14,nEnd);
            //convert string to int
            int passengerInt = Integer.parseInt(passenger_no);
            // declare new object car and assign the variables then add it to the array.
            Car c = new Car (reg, make, model, colour, passengerInt);
            carList.add(c);
} else if (line.indexOf("<bike>")> -1) {
         // Select/Extract the registration element
         int nStart = line.indexOf("<reg>");
         int nEnd = line.indexOf("</reg>");
         String reg = line.substring(nStart+5,nEnd);
         // Select/Extract the make element
         nStart = line.indexOf("<make>");
         nEnd = line.indexOf("</make>");
         String make = line.substring(nStart+6,nEnd);
         // Select/Extract the model element
         nStart = line.indexOf("<model>");
         nEnd = line.indexOf("</model>");
         String model = line.substring(nStart+7,nEnd);
         // Select/Extract the colour element
         nStart = line.indexOf("<colour>");
         nEnd = line.indexOf("</colour>");
         String colour = line.substring(nStart+8,nEnd);
         // Select/Extract the load element
         nStart = line.indexOf("<load>");
         nEnd = line.indexOf("</load>");
         String load = line.substring(nStart+6,nEnd);
         //convert load string to double
         double bikeLoad = Double.parseDouble(load);
         // declare new object motorbike and assign the variables then add it to the array.
         Motorbike m = new Motorbike (reg, make, model, colour, bikeLoad);
         bikeList.add(m);
} else {
    // Select/Extract the service_number element
    int nStart = line.indexOf("<service_no>");
    int nEnd = line.indexOf("</service_no>");
    String service_no = line.substring(nStart+12,nEnd);
    console.println("service = " + service_no);
    nStart = line.indexOf("<reg>");
    nEnd = line.indexOf("</reg>");
    String reg = line.substring(nStart+5,nEnd);
    console.println("service = " + reg);
    nStart = line.indexOf("<date>");
    nEnd = line.indexOf("</date>");
    String date = line.substring(nStart+6,nEnd);
    console.println("service = " + date);
    nStart = line.indexOf("<miles>");
    nEnd = line.indexOf("</miles>");
    String miles = line.substring(nStart+7,nEnd);
    console.println("service = " + miles);
    nStart = line.indexOf("<part_replaced>");
    nEnd = line.indexOf("</part_replaced>");
    String part_replaced = line.substring(nStart+15,nEnd);
    console.println("service = " + part_replaced);
    //convert string to int
    int dateOfService = Integer.parseInt(date);
    //convert string to double
    double milesAtService = Double.parseDouble(miles);
    //convert service no to unique int
    int serviceNo = Integer.parseInt(service_no);
    // declare new object service and assign the variables then add it to the array.
    Service s = new Service (reg, part_replaced, serviceNo, dateOfService, milesAtService);
      serviceList.add(s);
      catch (Exception e) {
        // Run out of data
        moreToRead = false;
} If anyone can spy anything that could be causing this I love your advice. I simply can't see it.
Jo

hi jos,
we have been asked not to use a parser for this assignment. evil
tutor i think! lolYour example seems to imply that all the <tag> ... </tag> pairs have
to occur on a single line; if that is so, you can do some cheap
programming like this:String getText(String line, String tag) {
   int start= line.indexOf("<"+tag+">");
   int end= line.indexOf("</"+tag+">", start);
   if (start < 0 || end < 0) return null; // no <tag> ... </tag> pair found
   // return the text in between the <tag> ... </tag> tags
   return line.substring(start+tag.length()+2, end);
}kind regards,
Jos

Read email adress from a text file then check the validity of them

a text file has three lines, each line contains one email adress:
[email protected]
qwe@@ws.com
wer//@we.net
read the email address from a text file, then check which one is invalid, output the invalid email adress in the console.

no 3 .umm, an email adress can have more than 2 '.'s in it,
example:
[email protected]
would be a valid email address.
To decide what a valid address is you'd need to parse it against the correct standard.
I think however that javax.mail.internet.InternetAddress does this for you, check out the docs:
http://java.sun.com/products/javamail/1.2/docs/javadocs/javax/mail/internet/InternetAddress.html
even if it parses it may not be a valid address though in that it may not actually exist.

Reading signed interger from a text file:

Is this possible with some construct in java? Attempting to read a signed number using .readInt() throws an exception before the first token is a malformed int. i,e, the sign + or -.
I would like to read a signed integer from a text file but I am clueless.
Any help is appreciated.

It can be a bit of a dilemma for lexical analysers. Say you read "a + 12" then you'd generally want to process that as three separate lexemes. The monadic form of plus is less common than the monadic minus.
A quick test shows that "+12" and "+ 12" are both rejected by Integer.parseInt() (which surprised me).
I'd suggest if you want to read positive numbers then first analyse your input using a regular expression, for example "\\s*([-+]?)\\s*(\\d+)" followed by
(matcher.match(1).equals("-") ? -1 : 1) * Integer.parseInt(matcher.match(2));Edited by: malcolmmc on May 24, 2010 2:10 PM

How to read some records from a text file into java(not all records)

hello,
how to read text files into java. i need only few records from the text file not all records at a time.
If any one knows plz reply me
my id is [email protected]

this snipet reads a text file line by line from line 1 to 3
try {
              FileReader fr = new FileReader(directory);
              BufferedReader br = new BufferedReader(fr);
              int counter = 0;
              while ((dbconn = br.readLine()) != null) {
                  switch(counter){
                      case 0:
                        status = dbconn;
                      break;
                      case 1:
                        userName = dbconn;
                      break;
                      case 2:
                        apword = dbconn;
                      break;
                  counter++;
              br.close();
    }catch(IOException e){
    }

Read specified line from a text file

Hi,
I am trying to read a specific line from a text file. I don't want to read all of it but just this specific line... say line number 2. Is there a method built-in in java or should I code this myself?
Thanks and regards,
Krt_Malta

Krt_malta wrote:
I am trying to read a specific line from a text file. I don't want to read all of it but just this specific line... say line number 2. Is there a method built-in in java or should I code this myself?Is there anything in your use case that precludes using the offset of the start of the line rather than the line number?

Having trouble reading specific lines from a text file and displaying them in a listbox

I am trying to read specific lines from all of the text files in a folder that are reports. When I run the application I get the information from the first text file and then it returns this error: "A first chance exception of type 'System.ArgumentOutOfRangeException'
occurred in mscorlib.dll"
Below is the code from that form.
Option Strict On
Option Infer Off
Option Explicit On
Public Class frmInventoryReport
Public Function ReadLine(ByVal lineNumber As Integer, ByVal lines As List(Of String)) As String
Dim intTemp As Integer
intTemp = lineNumber
Return lines(lineNumber - 1)
lineNumber = intTemp
End Function
Public Function FileMatches(ByVal folderPath As String, ByVal filePattern As String, ByVal phrase As String) As Boolean
For Each fileName As String In IO.Directory.GetFiles(folderPath, filePattern)
If fileName.ToLower().Contains(phrase.ToLower()) Then
Return True
End If
Next
Return False
End Function
Private Sub frmInventoryReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim intcase As Integer = 1
Dim strTemp, strlist, strFile As String
Dim blnCheck As Boolean = True
strFile = "Report Q" & intcase.ToString & ".txt"
Do While blnCheck = True
strFile = "Report Q" & intcase.ToString & ".txt"
Dim objReader As New System.IO.StreamReader("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\" & strFile)
Dim allLines As List(Of String) = New List(Of String)
Do While objReader.Peek <> -1
allLines.Add(objReader.ReadLine())
Loop
objReader.Close()
strlist = ReadLine(1, allLines) & "" & ReadLine(23, allLines)
lstInventory.Items.Add(strlist)
intcase += 1
strTemp = intcase.ToString
strFile = "Report Q" & intcase.ToString & ".txt"
blnCheck = FileMatches("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\", "*.txt", intcase.ToString)
Loop
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim intcase As Integer = 1
Dim strTemp, strlist, strFile As String
Dim blnCheck As Boolean = True
strFile = "Report Q" & intcase.ToString & ".txt"
Do While blnCheck = True
strFile = "Report Q" & intcase.ToString & ".txt"
Dim objReader As New System.IO.StreamReader("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\" & strFile)
Dim allLines As List(Of String) = New List(Of String)
Do While objReader.Peek <> -1
allLines.Add(objReader.ReadLine())
Loop
objReader.Close()
strlist = ReadLine(1, allLines) & "" & ReadLine(23, allLines)
lstInventory.Items.Add(strlist)
intcase += 1
strTemp = intcase.ToString
strFile = "Report Q" & intcase.ToString & ".txt"
blnCheck = FileMatches("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\", "*.txt", intcase.ToString)
Loop
End Sub
End Class
Sorry I'm just beginning coding and I'm still a noob. Any help is appreciated. Thank you!

Ok, so if I'm following this correctly you should be able to just loop through all of the files in that folder whose file name matches the pattern and then read the first 22 lines, recording only the first and the last.
Exactly how you store the animal data probably depends on how you are going to display it and what else you are going to do with it. Is there anything other than name and cage number that should be associated with each animal?
You might want to make a dataset with a datatable to describe the animal, or you might write a class, or you might just use something generic like a Tuple. Here's a simple class example:
Public Class Animal
Public Property Name As String
Public Property Cage As String
Public Overrides Function ToString() As String
Return String.Format("{0} - {1}", Name, Cage)
End Function
End Class
With that you can use a routine like the following to loop through all of the files and read each one:
Dim animals As New List(Of Animal)
Dim folderPath As String = "E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\"
For Each filePath As String In System.IO.Directory.GetFiles(folderPath, "Report Q?.txt")
Using reader As New System.IO.StreamReader(filePath)
Dim lineIndex As Integer = 0
Dim currentAnimal As New Animal
While Not reader.EndOfStream
Dim line As String = reader.ReadLine
If lineIndex = 0 Then
currentAnimal.Name = line
ElseIf lineIndex = 22 Then
currentAnimal.Cage = line
Exit While
End If
lineIndex += 1
End While
animals.Add(currentAnimal)
End Using
Next
'do something to display the animals list
Then you might bind the animals list to a ListBox, or loop through the list and populate a ListView. If you decided to fill a datatable instead of making Animal instances, then you might bind the resulting table to a DataGridView.
There are lots of options depending on what you want and what all you need to do.
Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

Reading dilimited input from a text file with tokenizer

i am trying to read in a text file with the following structure: 2 integers on each line with comma as the delimitor.
i am using the BufferedReader stream and Tokenizer to detect ",".
try {
BufferedReader in = new BufferedReader(new FileReader(filename));
//read in the data file
while ((s = in.readLine())!= null) {
int i = 0;
for (i = 0; i < 100; i++) {
t = new StringTokenizer(s,",");
A1 = Integer.parseInt(t.nextToken());
catch (IOException e) {System.err.println(e);}
When i print out A1[i], it only reads the last line of the text file. Please tell me what's wrong.
Also i'd really like A1[i] to store the integer before the comma and another array A2[i] to store the integer after the comma. Please help.
Thanks.
p.s. A1 and A2 are arrays...when i previewd message in Netscape 7 it left out the brackets and the index....

What is the for i loop for? If it is to read the next line from the file, then the while loop has taken care of it. Other than this there should be no problem with the rest of the code.
Just add another line to store the next token into A2.

Reading Each String From a text File

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