Writing Text Files in Java

hello!
i am creating an Applet game and I would like to
create Rankings.
So, i need to take data from java and transfer them
into HTML. At my
university's book says that everytime we open a file
to write in it, if there are
already data, Java removes them and then writes the
new ones. But I want
a static file where Java can write the updated
rankings and HTML can take
them and use them in site. Is there any way to achive
that guys?
If i wasn't clear, i just want a way to make Java not
to delete any data in a file
everytime it needs to write something in it!
thanks alot!There are a number of problems here.
First of all you can always append to a file, but that's not actually what you want to do.
Second you can read the whole file in, find the values you want, change them and write the whole file back. This is more of what you want to do but HTML is not the best choice for doing this.
But the most fundamental problem is that you do not write to files of any kind in an Applet.

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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 {
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How to print a text file using Java

How can I print a text file using Java without converting the output to an image format. Is there anyway I can send the characters in the text file as it is for a print job? I did get a listing doing this ... but that converted the text to an image format before printing....
THanks,.

Hi I had to write a print api from scratch, and I did not convert the output to image. Go and read up on the following code. I know there is a Tutorial on Sun about the differant sections of the snippet.
private void printReport()
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How to get the source code of an HTML page in Text file Through java?

How to get the source code of an HTML page in Text file Through java?
I am coding an application.one module of that application is given below:
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Could any body provide coding hint for that

You're welcome. How about awarding them duke stars?
edit: cheers!

How to replace a line ina text file using java?

Hi ALL,
Does anybody know how to replace a line in a text file uisng java.

use this thing:
http://doesthatevencompile.com/current-projects/code-sniplets/ASCIIFile.htm
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How to convert a HTML files into a text file using Java

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HTML files are already text files. What do you mean you want to convert them?
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How to read a text file using Java

Guys,
Good day!
Please help me how to read a text file using Java and create/convert that text file into XML.
Thanks and God Bless.
Regards,
I-Talk

     public void fileRead(){
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           ex.printStackTrace();
         catch (IOException ex){
           ex.printStackTrace();
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cheers
Mohammed Jubaer Arif.

Read Text file using Java Script

Hi,
I am trying to read a text file using Java Script within the webroot of MII as .HTML file. I have provided the path as below but where I am not able to open the file. Any clue to provide the relative path or any changes required on the below path ?
var FileOpener = new ActiveXObject("Scripting.FileSystemObject");
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FileContents = FilePointer.ReadAll(); // we can use FilePointer.ReadAll() to read all the lines
The Error Log shows as :
Path not found
Regards,
Mohamed

Hi Mohamed,
I tried above code after importing JQuery Library through script Tag. It worked for me . Pls check.
Note : You can place Jquery1.xx.xx.js file in the same folder where you saved this IRPT/HTML file.
<HTML>
<HEAD>
<TITLE>Your Title Here</TITLE>
<SCRIPT type="text/javascript" src="jquery-1.9.1.js"></SCRIPT>
<script language="javascript">
function Read()
$.get( "http://ldcimfb.wdf.sap.corp:50100/XMII/CM/Regression_15.0/CrossTab.txt", function( data ) {
$(".result").html(data);
alert(data);
// The file content is available in this variable "data"
</script>
</HEAD>
<BODY onLoad="Read()">
</BODY>
</HTML>

Changing HTML to text file using java

Hi,
I am doing a project in which i have to read news articles from websites. I have tried XML but for that i need to know which tag has the article in it. Since i have to read from various websites so each site used different tags for different informations.
Is there anyway that i can change an HTML file into a text file using java. Maybe some command that removes all the HTML tags and gives just the information. Is there anything else that anyone would like to recommend?
Thanx
yafis

Maybe something like this:
import java.io.*;
import java.net.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
class GetHTMLText
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          Document doc = kit.createDefaultDocument();
          // The Document class does not yet handle charset's properly.
          doc.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
          // Create a reader on the HTML content.
          Reader rd = getReader(args[0]);
          // Parse the HTML.
          kit.read(rd, doc, 0);
          // The HTML text is now stored in the document
          System.out.println( doc.getText(0, doc.getLength()) );
     // Returns a reader on the HTML data. If 'uri' begins
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     static Reader getReader(String uri)
          throws IOException
          // Retrieve from Internet.
          if (uri.startsWith("http:"))
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               return new InputStreamReader(conn.getInputStream());
          // Retrieve from file.
          else
               return new FileReader(uri);
}

Writing or modifying text files in java

Dear all,
I have the next text file:
goods: 5
bids: 4
% num, price, good, good, ..., good, #
0 2075 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
I have to modify or create the file above, using output data from one java program. For example, The output of my java program in the next execution is:
goods: 8
and price (0) changes from 2075 to 2078.
so, using this output data my java program should write (create or modify) the next text file with the changes:
goods: 8
bids: 4
% num, price, good, good, ..., good, #
0 2078 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
I have tried using: output.write( objetc );
but it doesn't work as I need :( .
Somebody can help me or give me some idea?
Thanks,
Andrea

This is the code:
File testFile = new File("D:\\result1.txt");
setContents(testFile, " bla bla bla (few characters) ");
static public void setContents(File aFile, String aContents)
throws FileNotFoundException, IOException {
try {
//use buffering
output = new BufferedWriter( new FileWriter(aFile) );
output.write( aContents );
finally {
//flush and close both "output" and its underlying FileWriter
if (output != null) output.close();
I mean, this code dont work because it let me write few characters only. I need to write the whole file:
goods: 8
bids: 4
% num, price, good, good, ..., good, #
0 2078 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
with the special characters as (#).
Sorry, if it post is not clear.
Thanks.

Fill a text file from java code

Hello,
I've written a java code to insert some informations in a database and
I also want to save the same informations in text files (.txt).
Thanks you for your suggestions or your advice of a tutorial that can help me to perform successfully this task.
J.S.

Writing to a file is pretty easy in Java. A simple way is to use the PrintStream class.import java.io.*;
public class MyClass {
public static void main(String[] arg) throws IOException {
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    //always close the PrintStream when finished
    ps.close();
}Alternatively, for a good tutorial, click the 'Tutorials' link in the left column on this page.

Trying to write data to a text file using java.io.File

I am trying to create a text file and write data to it by using java.io.File and . I am using JDeveloper 10.1.3.2.0. When I try run the program I get a java.lang.NullPointerException error. Here is the snippet of code that I believe is calling the class that's causing the problem:
String fpath = "/test.html";
FileOutputStream out = new FileOutputStream(fpath);
PrintStream pout = new PrintStream(out);
Do I need to add additional locations for source files or am I doing something wrong? Any suggestions would be appreciated.
Thank you.

Hi dhartle,
May be that can help:
* Class assuming handling logs and connections to the Oracle database
* @author Fabre tristan
* @version 1.0 03/12/07
public class Log {
    private String fileName;
     * Constructor for the log
    public Log(String name) {
        fileName = name;
     * Write a new line into a log from the line passed as parameter and the system date
     * @param   line    The line to write into the log
    public void lineWriter(String line) {
        try {
            FileWriter f = new FileWriter(fileName, true);
            BufferedWriter bf = new BufferedWriter(f);
            Calendar c = Calendar.getInstance();
            Date now = c.getTime();
            String dateLog =
                DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM,
                                               Locale.FRANCE).format(now);
            bf.write("[" + dateLog + "] :" + line);
            bf.newLine();
            bf.close();
        } catch (IOException e) {
            System.out.println(e.getMessage());
     * Write a new line into a log from the line passed as parameter,
     * an header and the system date
     * @param   header The header to write into the log
     * @param   info    The line to write into the log
    public void lineWriter(String header, String info) {
        lineWriter(header + " > " + info);
     * Write a new long number as line into a log from the line
     * passed as parameter, an header and the system date
     * @param   header The header to write into the log
     * @param   info    The line to write into the log
    public void lineWriter(String header, Long info) {
        lineWriter(header + " > " + info);
     * Enable to create folders needed to correspond with the path proposed
     * @param   location    The path into which writing the log
     * @param   name        The name for the new log
     * @return Log         Return a new log corresponding to the proposed location
    public static Log myLogCreation(String location, String name) {
        boolean exists = (new File(location)).exists();
        if (!exists) {
            (new File(location)).mkdirs();
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        return myLog;
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    public static Connection oracleConnectionCreation() throws Exception {
        // Register the Oracle JDBC driver
        DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
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[pre]
This class contained some other functions i've deleted, but i think it still works.
That enables to create a log (.txt file) that you can fill line by line.
Each line start by the current system date. This class was used in swing application, but could work in a web app.
Regards,
Tif

Sorting Names in a text file using java program

h1. Deleting numbers in a text file, sorting the names and writing in to a new file
h2. Sample data
=================
71234 RAJA
89763 KING
89877 QUEEN
==================
h2. Java Program
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
class Sortnames {
public static void main(String args[]) {
try {
ArrayList storeWordList = new ArrayList();
ArrayList storeWordList2 = new ArrayList();
               int i;
char c;
               String inputfile = "names_konda.txt";
               String tempfile = "newdatafile.txt";
               String outputfile = "sortedoutput.txt";
               StringBuffer strBuff=null;
Writer output = null;
File file =null;
               Writer sortedoutput = null;
boolean select =false;
               //*********************************************** Reading data from Input file
FileInputStream fstream = new FileInputStream(inputfile);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
storeWordList.add(strLine);
//Close the input stream
in.close();
               //*********************************************** Adding only alphabets to buffer and writing to file
               file= new File(tempfile);
               output = new BufferedWriter(new FileWriter(file));
strBuff = new StringBuffer();
for (Iterator iter = storeWordList.iterator(); iter.hasNext();) {
     String s = (String) iter.next();
                    //System.out.println("String "+s);
     for (i = 0; i < s.length() ; i++)
c = s.charAt(i);
if (Character.isLetter(c)) {
strBuff.append(c);
                    strBuff.append("\n");
String myout = strBuff.toString();
     output.write(myout);
     output.close();
     //============================================== Reading the created file,Sorting and placing in Collections
               FileInputStream fstream2 = new FileInputStream(tempfile);
// Get the object of DataInputStream
DataInputStream in2 = new DataInputStream(fstream2);
BufferedReader br2 = new BufferedReader(new InputStreamReader(in2));
String strLine2;
//Read File Line By Line
while ((strLine2 = br2.readLine()) != null) {
storeWordList2.add(strLine2);
Collections.sort(storeWordList2);
               //===================================================
File sortedfile = new File(outputfile);
sortedoutput = new BufferedWriter(new FileWriter(sortedfile));
for(int m=0; m<storeWordList2.size(); m++)
     if (storeWordList2.get(m).toString().trim().length() > 0)
          sortedoutput.write(storeWordList2.get(m).toString());
                    sortedoutput.write("\n");
sortedoutput.close();
System.out.println("Names Sorted SUCCESFULLY");
br.close();
br2.close();
in.close();
fstream.close();
fstream2.close();
               ///==========================================
               File f1 = new File(tempfile);
               boolean success = f1.delete();
               if (!success){
                    System.out.println("failed deletion ");
                    System.exit(0);
                    }else{
                    System.out.println("deleted");
               // ==========================================
} catch (Exception e) {//Catch exception if any
System.out.println("Error: " + e);
h2. Thanks and regards
h1. BalaNagaRaju.M
h1. [email protected]

Do you have a question? Also see the sticky welcome post on how to post formatted code.

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

Can't read a text file using java

Hi All
I am trying to read a log file.
ProgramA keeps updating the log file, while my program ProgramB reads it.
For some readson my ProgramB is not able to read the last two lines in the log file. If I run the program in debug mode it is reading all the lines.
This is having me frustrated.
Please let me know if there is a way to read entire contents.
Here is how I am reading the files ( 2ways)
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        StringBuffer fileData = new StringBuffer(1000);
        FileReader fr = new FileReader(filePath);
        BufferedReader reader = new BufferedReader(fr);
        char[] buf = new char[1024];
        int numRead=0;
        while((numRead=reader.read(buf)) != -1){
            String readData = String.valueOf(buf, 0, numRead);
            fileData.append(readData);
            buf = new char[1024];
        reader.close();
        fr.close();
        return fileData.toString();
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       * @param aFile is a file which already exists and can be read.
       static public String readFileAsString(String filePath) {
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         //declared here only to make visible to finally clause
         BufferedReader input = null;
         try {
           //use buffering, reading one line at a time
           //FileReader always assumes default encoding is OK!
           input = new BufferedReader( new FileReader(filePath) );
           String line = null; //not declared within while loop
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           try {
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               input.close();
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             ex.printStackTrace();
         return contents.toString();
       }

If you're using JDK 5 or later, you could use the Scanner class for input information. See below:
try {
               Scanner reader = new Scanner(new File("C:\\boot.ini"));
               StringBuilder sb = new StringBuilder();
               while (reader.hasNextLine()) {
                    sb.append(reader.nextLine());
                    sb.append(System.getProperty("line.separator"));
               System.out.println(sb.toString());
          } catch (FileNotFoundException e) {
               e.printStackTrace();
          }

Writing Text Files in Java

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