This may have something to do with it. You are opening a (binary) gzip file, and then wrapping it with a Reader (which is for reading character-based streams) without specifying the character set, so it is using the default, whatever that is. It may be the case that the stream, although text (even though all streams are binary under the covers), ... |
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Hi All, Can anyone help me? I need to read a txt file and get some data from a specific column, and later check into database, and with that information, I need to alter that line in the same txt. I know how to connect to database, and read a line, but nothing more. Do anyone have any example? I would ... |
Hi , How to read a 10GB file and load the data in file to a JTable . I knew that JVM can't handle data more than 1.5 GB . So i thought of using the Java class RandomAccessFile for reading purpose . Even after reading the file , i have to display the contents of file in a JTable. How ... |
I agree with all the others, scanner is the better tool here. I said so [over in your JavaRanch thread.|http://www.coderanch.com/t/457335/Java-General/java/read-Double-from-File] svpriyan00, It is usually best to stick with one forum when posting, to prevent duplicating work. When you do post in multiple forums you should provide links back and forth between them so everyone knows what is being said. You should ... |
You need to distinguish between binary data and text. (And read [this excellent introduction into Unicode|http://www.joelonsoftware.com/articles/Unicode.html] to learn how they relate to each other). Then you need to remember these simple rules: - When handling binary data, you will want to use byte/byte[]/InputStream/OutputStream - When handling text data, you will want to use char/char[]/String/Reader/Writer In your case you're handling Text (even ... |
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I've been using the following code for a while now to read a file into a byte array: FileInputStream stream=new FileInputStream(file); byte[] bytes=new byte[(int) file.length()]; stream.read(bytes); This works perfectly well on Windows XP, Mac OS X and Ubuntu. However, it seems that sometimes the operation fails on Windows Vista. I know the common way is to have some array with a ... |
As far as I know there are not Type 4 drivers for MS Access, mainly because MS Access has no network protocol. Type 2 drivers would be possible, but I don't think they exist (at least not for free). The main problem about MS Access is that it does a pretty lousy job at being a database. It's better suited as ... |
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Oh ok, i understand now.. i meant to include the the last println a \n to break up the grouping. But that doesn't matter because your not getting the output that you want. Let me do some research on your question and I'll get back to you. Do you think that it's because your storing the information in a bytearray? have ... |
Hi... I am facing some problem in reading contents of a file.... The contents of the file are: 14 1 3 1 4 2 6 2 12 . . . 14 13 int a; FileInputStream fin; fin = new FileInputStream("file.txt"); Now I am reading the first line (i.e. 14) using the command 'a = fin.read()'. But if I print this, it ... |
Either you need to give it more memory, or process the data more efficiently or both. To process the data more efficiently you need to process it progressively (as you read it) As @flounder This means instead of building a List, you have process each line (do what every you are going to do with the data) and then discard it. ... |
Also note that your keys will be Strings, so when you use the TreeSet (or other sorted collection) you will get the Strings in alphabetic order, not order that they are read. Which means the input you provided will likely come out like: P10 P2 P3 P4 etc... Why do you need to get them out in order? If you truly ... |
Hi, i have file which contains header information and textual information as its data. header syntax is as follows: Its like key value pair. now i want to read this header content which is wriitten at the first line of every file and wants put value in a proper key variable. how can i do this |
Now, I am able to connect to that server, complete the authentication process, go to particular file and get the contents to InputStream. But problem is with the getting the contents, it failed to get the all ontents of file.sometimes it able to get all contents and sometime it getting only few lines. Donno why it is happening so...Here is the ... |
There is no built in method to do this. You can either invest some time into learning about regular expressions or just write a method that iterates over your string char by char. As long as you are reading letters append them to some temp variable, as soon as you encounter a number save that temp variable somewhere and swap over ... |
for (int count=1; count <=3; count++) { linRead = r1n.next(); System.out.println (linRead); } OUTPUT WHEN RUN Maximizor 50 50 Robinator the problem is i get "Robinator" on the 3rd loop. How do i code it so that my output looks like this and i've already tried letting it only run twice but that didn't work. Maximizor 50 50 |
private boolean inputFile; private RandomAccessFile file; private long position; private char buffer; BufferedReader br; /** * Text File constructor. Open a file for reading, or create * a file for writing. If we create a file, and a file already * exists with that name, the old file will be removed. * @param filename The name of the file to read ... |
I added those and it says that the file exists though the rest are false: java.io.FileNotFoundException: C:\data.txt (The system cannot find the file specified) File C:\data.txt is regular file: false File C:\data.txt is readable: false at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.(FileInputStream.java:106) at client.ClientMain.main(ClientMain.java:28) Couldn't get I/O for the connection to: localhost Java Result: 1 |
Hi Guys, Iam trying to read a file from a directory as follows: String name = new String(filePath + fileName + ".apr"); File file = new File(name); My problem is that the file extension ".apr" could be in any case(For Example:- "apr","APR","Apr") So my reading of the file fails if the file extension differs from ".apr" to any of the extension ... |
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Dear Experts I want to read a file character by character. I would appreciate if anyone will let me know if there is a function like fgetc (of C programming language) or cin.get (like c++) I would also be interested in reading a file word by word like the cin.get(temp,' ') // delimited by space I would appreciate your help in ... |
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hi all, i am trying to read a file using BufferedReader and StringTokenizer. The file contains a line as follows, "ABC", "ABC", "ABC", 1, 2, 3 now when i printout st.sval it only prints out the stuff within the quotes and null for the nos. how should i pick up the nos as well. pls help. thanks. |
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CSMSData 0 6 6 3 6 8 1 A 1 1 / 2 7 / 2 0 0 8 1 2 : 0 3 : 1 2 sender no. 6 6 3 6 8 1 message: A date and time:1 / 2 7 / 2 0 0 8 1 2 : 0 3 : 1 2 each line a ... |
Hi all, i suppose the below code reads my file 'ridata.dat' when it is in the same folder as my java class file. How can i read it from a different location? ---------------------------------------------------------------FileRead.java--------------------------------------------------------------- import java.io.*; class FileRead { public static void main(String args[]) { try{ // Open the file that is the first // command line parameter FileInputStream fstream = new ... |
Help people, I am trying to program a java game but because I have vista installed an error is occurring which doesnt occur when I run the program in linux or XP. All I am trying to do is read from a file. I mean there is nothing wrong with the code except when I run it in a system that ... |
OK. I know a little about file reading but not much. I have a file that has rows of different values, not all the same. Something like this: Integer_____Integer_____String_____Double ... Currently they are spaced with a tab. What I want to do is to take a value from a int specified line and access either the 2nd or 3rd, etc value. ... |
Hi eveyone I have a question regarding reading a file. I need to output how many times the numbers appear into a label box ex: the number 6 appeared 3 times".Right now my code just finds the sum of all numbers (did that to try it) I can not figure out how to count the number of each number. thanks volunteers ... |
My resource bundle contains data in the following format worksheet_MyTemplates =}C ev[g worksheet_Refresh =XV worksheet_Submit =M worksheet_Prev =O worksheet_Next = worksheet_Search = After reading from the resource bundle i need to convert that kanji string to escape sequence(\uXXXX). By passing stand alone string to utility class i am able to generate escape sequence. But dynamically after reading from resource bundle,i need ... |
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Your exception catch blocks are a bit anemic in that you may wish to print the exception's stacktrace rather than just printout "file not found". You would do well to go through the basic IO tutorial on the Sun site to read up on how to do text file input and output. Good luck. |
Consider the file as an external resource. One should never keep an open connection to an external resource. In other words, read the resource and then go back and check the size and last modified dates of the resource. If they have changed, notify the user as necessary and re-read the resource. Will save you an enormous amount of flailing around ... |
Hi, if I want to point to a directory and have a java app go through each of the files one by one to rename them according to a naming scheme (e.g. newFile1, newFile2,...), is there a technique similar to Scanner's hasNext method to navigate through the files and know when to stop? I haven't been able to find much while ... |
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sorry for the unrelated nitpick, but please avoid unnecessary abbreviations in your posts here. I recommend this for several reasons: 1) Programming is an exercise in precision. When you communicate here (or anywhere) about programming issues and questions, you want this communication to be as clear as possible to avoid any chance for ambiguity. I'd say at least half the answers ... |
Hi All, i used LineNumberReader class and set the line number to 3, then i used readline... the o/p Readline is the first line of the file ... I think it has to give the o/p of line 3.... The file has more than three lines any Comments is appreciated .. Im confused -Shasi |
My java code is checking some condition and if it fails it is sending a mail which is currently hard coded in the java code. The mail will have static as well as runtime values .............I want to move the static contents of mail from java code to an xml file ........then i want to read the static contents from the ... |
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Hello, My code to read .DAT file gave me incorrect result. My .DAT file is having record with three columns (zip, latitude, longitude). When I read this .DAT file in DELPHI, giving correct result but not in java. I have given my java code below, File f = new File("c:/ZipTile.dat"); FileInputStream file_input = new FileInputStream (f); DataInputStream data_in = new DataInputStream ... |
Let's say that I wanted to create a GUI that could read a series of .txt files (each one representing an item) and additionally read more information from that same file if needed to display if selected from a list. Conceptually, what is the most effective way to go about this? If each Item is to be an object, how should ... |
Hello everyone, i have the following problem and hope you can help me, the mainframe sends a few reports to a certain folder, the reports are written in EBCDIC format, which I have to do is making a program in java that reads the files (reports) in this folder and eliminate some reports according to certain string, text, in its content ... |
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Below is the code I am using to try this out. I am able to output the contents of a text file but not the pdf. Is this because I am using the wrong file reader or is it because PDFs like Doc files have formating, font types etc which txt files do not and therefore Java cannot read them? I ... |
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I'm writting a program that compares to physical disk drives to ensure backups have restored correctly, but I'm hitting a problem on Vista whereby junctions appear as real files (the absolute and canonicle paths return the same value) and result in recursive looping behaviour. I've seen the same thing happen in some older Windows programs so I guess Java is not ... |
Your hunch is correct. The offset and len parameters to FileInputStream refer to the destination array (you could read characters into the middle of an existing array). So in your case they should be 0 and 60000 respectively (or alternatively the read(byte[]) form of the method). The array index out of bounds exception occurs upon the second read because the offset ... |
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i am having data like this..from this i would like to read from Date to Bad Name of The project Aster Location Hyderabad Employee name Praveen kumar Site name VTSL Emp ID 1478 Type of site Demo Team member details period from 11-03-2008 To 15-05-200 1 Kiran 4 Sridhar Total no of Days 24 2 Bharath 5 Shankar 3 Damodar 6 ... |
hi, i am new to java. Could you pls tell me how to read a fixed width file and then insert its contents into a table in the database. Is it possible if i keep a track of start position and end position of various field in the file? for example if a file has fields like xxx(10 characters), yyy(1000 characters)zzz(100 ... |
I am using different java programs to wite to text file.Now I want to read data from this file every 10 seconds while the java programs are still copying to file i.e. if after first 10 seconds the data is read then after another 10 seconds that data should be ignored and the rest of the data should be read.Also, remember ... |
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Hello, I am about to read with a Java program all attributes of a file. These are e.g. Name of the user, modify Date, create date, so every Attributes which a file has. With the class "file" it was not possible. Where are in JAVA the necessary classes for this? Thanks at advance Gruss |
My addEdge method looks like: public void addEdge(int start, int end, int weight, String line) { adjacentMatrix[start][end] = weight; edgeLine[start][end] = line; } as the information in my read file will look like, for example: 1, 2, 3, England 2, 3, 5, Scotland ... ... Can anyone recommend a way of how i can read this into my source code? |
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I wanna upload a(doc/pdf) file from client site, where I hv to check whether the the file is originally a doc/pdf file or not, I mean not just the extension, but the actual header information of the file. Please some body help me to do this, I dont know how to read the file header. Thnx in advnc. |
Hey, I am working now on Java application and I want it to open HTML file during its run. I can open it with the JEditorPane but it's not supporting everything like a browser, so I prefer to open it with my default browser. BTW, I am working with Windows XP. Can you please tell me how can I do that? ... |
Hi 233333|45GH5|188618|||SJU34343A|SJ3443391AA|52HV3KSM|564011089022|001D312||||44592984|44592985 above mentioned one is my flat file data. my code is package com.examples; import java.io.*; public class FileDemo { String strPack_Array[ ] = new String[16]; String strElement = null; public static void main(String args[]) { try { FileReader fis= new FileReader("ganga.txt"); BufferedReader bf = new BufferedReader(fis); String str = bf.readLine(); FileDemo f1= new FileDemo(); f1.validateRecord(str); } catch (Exception e) ... |
try{ PdfWriter.getInstance(document,new FileOutputStream("D:\\Kiran HelloWorld.pdf")); document.open(); while((strLine=br.readLine())!=null) { if (strLine.length()>0) //System.out.println(strLine); switch(i){ case 0: if(strLine.startsWith("FAX")){ System.out.println(strLine); document.add(new Paragraph(strLine)); } case 1: if(strLine.startsWith("Sent")){ System.out.println(strLine); document.add(new Paragraph(" ")); document.add(new Paragraph(strLine)); } case 2: if(strLine.startsWith("Time")){ System.out.println(strLine); document.add(new Paragraph(" ")); document.add(new Paragraph(strLine)); } case 3: if(strLine.startsWith("Date")){ System.out.println(strLine); document.add(new Paragraph(" ")); document.add(new Paragraph(strLine)); } case 4: if(strLine.startsWith("Quantity")){ System.out.println(strLine); document.add(new Paragraph(" ")); document.add(new Paragraph(strLine)); } case 5: if(strLine.startsWith("FROM")){ ... |
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I have a file which contains dates of birth in the form of 3 integers on each line, if I want to read in this line from the file and separate each (day,month,year), what is the easiest/best way to do this? The 'day' part of the date can either be stored as 1 or 2 digits depending on the date, same ... |
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Hi everybody, How to do it in JAVA: I have a text file that is filled with new lines of text every n seconds. This text file get very massive. I want to have my program to monitor this text file and to be able to read only the new added line when it detect that a new line has been ... |
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You can use string tokenizer class and break the input into tokens, when you are using String tokenizer class it stores the tokens(every word) in an array automatically so then from here its simple. use a for loop and search for the full stop, when you find it( from the start index till here, put these array values in a String ... |
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I'm gonna guess no. The API doesn't seem to support switching out streams on the fly or whatever it is you're trying to do. So what is it you're trying to do? I've never tried what you want or seen anyone do it. My advice would be just to reconstruct the BufferedReader with the new Reader when/if you have a new ... |
Hi Everyone, I am new to Java programming and I am having problems reading a file and then taking the file and breaking it strings and floats. Example of my text file: 1 SOLF 25.20 -2.42 28.50 28.90 25.07 27.62 1/11/2008 4:00:10pm 2 BYI 47.33 -1.70 48.56 49.00 47.24 49.03 1/11/2008 4:02:49pm I am trying to assign the colums as follows: ... |
Generating a file with the name "John Smith" repeated 200,000 times and running your code (with appropriate definitions of source and word) with that file on my laptop prints out the value of the word variable 200,000 times and "... found 200000 products. " appears after 2.37 seconds on my mid-range laptop. Either a) you need a much faster computer b) ... |
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The method setReadOnly() in the type File is not applicable for the arguments (boolean) Its just setReadOnly() Oke this is maybe a little stupid but here comes my new question: What I'm trying to do is saving some int's in a file. Users should not be able to edit it. But the application has to be able to edit the file ... |
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Hi, i didnt under stood your requirement properly. i will tell normal usage of the html and jsp page. usually we created the jsp page by using the html pages. converting the html page to jsp page means.simply we have to replace the html tags with struts tag. here we have repalce the normal html buttons with struts submit buttons. Regards, ... |
Hi Friend I Have a Problem that. I have to read file witch content more then 5 lack records. And each line in the file is one record. My task is that I have to filter the record. Means to say that I have to filter that record witch are duplicate and I have to keep only one record means unique ... |
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I need to read a text file, and I need to extract words from it, not including any punctuation marks. I know how to read the file, but not entirely sure on how to skip over if it's not a word. Should I just use a bunch of if-statements? That doesn't sound like very good logic to me. :/ |
By using java.nio.charset.Charset charSet = java.nio.charset.Charset.defaultCharset(); the problem of identifying the charset is elliminated because when you call defaultCharset(), the default character set the JVM uses is used. Typically depends upon the locale and charset of the underlying OS is considered irrespecive of whether it is utf-8 or something else. -- Choicest Regards Amit Singh Rathore |
Its not the actual implementing of the variables im concerned with, i have a system somewhat worked out already, but serialization does seem like a better idea. The problem is I really have no clue on how I would actually read the file, and use those structures to get the data. After I read the file, and do each line, how ... |
What can I use in Java to get the information of a song? Like say I had a file named song.mp3, and it was a 50 cent named Wangsta, Producer Dr. Dre, etc. Itunes stores all that data in the mp3, so what can I use in Java to read that data? |
I am currently working on a program that must read an input file from the internet using a Scanner object. I know that to read files in from the computer, one would use "Scanner scan = new Scanner (new File ("myfile.txt"))" and that to read keyboard input "Scanner scan = new Scanner (System.in)". If I were to have a specific web ... |
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I'd suggest creating a class that can read the whole file in and store it in an appropriate data structure or class (e.g., create a class called Account, and have this class create a List of Account objects). Then make that class be able to take that data structure and write it to a file, in the same format that it ... |
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Is there any other way to read through a file other than nextLine? I know there's probably a simpler answer, but the only way I could think of doing it is storing the next line as a String and trying to find the specified word in the string. Not only am I not sure how to do that, I imagine there's ... |
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Hello, I searched about reading objects from a file in this forum but I didn't find some good answer to my problem. In my case I have a producer of objects that is putting the objects temporary into a buffer and if the buffer is full, I'm calling a procedure that writes in file the buffer content and so on until ... |
I could extract the values from only one row of tab-delimited file, as the tab-delimited file had the values also in row wise. then i tried filtering , BufferedReader fileRead = new BufferedReader(new FileReader("vvv.txt")); String str; String tempBuf; // while ((tempBuf=fileRead.readLine())!=null){ // Reading file till the EOF str = tempBuf.replace('\n', '\t'); // Replacing the '\n' by '\t' (filtering) fields = tempBuf.split("\t"); ... |
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Hi, I am using Batik Library to render SVG File to my Application panel. This can be easily done by using setURI(string URL) method of JSVGCanvas. But the problem is I can't find any functionality that loads the SVG Image from Byte Stream in the memory. If I have the SVG file in my memory then I have to dump it ... |
Hi I use a org.apache.struts.upload.FormFile. I take the InputStream of the File. Then i use java.io.LineNumberReader of InputStream. Then i read the file line by line as lineNumberReader.readLine(). Then i check while(lineNumberReader.readLine()! = null )then i proceed. It is work well. But at the end of the file that is after all the records are readed I got the NullPointerException. After ... |
Hi I am not quite sure in which thread this quiestion should be posted So I post it here I need to import Auto CAD files (DWG) into a java program for further processing with 3D api. I dont have any idea for doing it. Can any body give me a hint or link ? If there are guys who has ... |