I am using the code snippet below, however it's not working quite as I understand it should. public static void main(String[] args) { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String line; try { line = br.readLine(); while(line != null) { System.out.println(line); line = br.readLine(); ...
I am building a java server that needs to scale. One of the servlets will be serving images stored in Amazon S3. Recently under load, I ran out of memory in my VM and it was after I added the code to serve the images so I'm pretty sure that streaming larger servlet responses is causing my troubles. My question is : is there any best pr...
I use the Eclipse IDE to develop, compile, and run my Java projects. Today, I'm trying to use the java.io.Console class to manage output and, more importantly, user input. The problem is that System.Console() returns null when an application is run "through" Eclipse. Eclipse run the program on a background process, rather than a top-lev...
What is the best way to write bytes in the middle of a file using Java? ...
Hi, I have a class Test in C:/proj/test_xml/Test.java. Given parser.parse("test.xml"); I need a way to parse test.xml whether it is in current directory, proj or in C:/ Also, the solution should not make use of java.io Thanks ...
I'd like to convert gif images to jpeg using Java. It works great for most images, but I have a simple transparent gif image: [In case the image is missing: it's a blue circle with transparent pixels around it] When I convert this image using the following code: File file = new File("indexed_test.gif"); BufferedImage image = ImageIO...
According to the java api, the InputStream.read() is described as: If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. I have a while(true) loop doing a read and I a...
My problem is like this: I have a written a client side HTTP cache and I need to store the HTTP payload in the file system somehow. I do not want to clutter the filesystem with unnecessary files. I have written this class: /* * Copyright (c) 2008, The Codehaus. All Rights Reserved. * * Licensed under the Apache License, Version...
Hello, I've posted the same question here a few days ago(http://stackoverflow.com/questions/1088941/java-reading-standard-output-from-an-external-program-using-inputstream), and I found some excellent advices in dealing with a block in while reading ( while(is.read()) != -1)), but I still cannot resolve the problem. After reading the a...
I have inherited some code: Process p = new ProcessBuilder("/bin/chmod", "777", path).start(); p.waitFor(); Basically, there is for some ancient and highly voodoo based reason for storing key/value pairs on disk as files. I don't really want to go into it. However, I am left with a bunch of IO exceptions: Exception :Cannot run progra...
java.io has many different I/O streams, (FileInputStream, FileOutputStream, FileReader, FileWriter, BufferedStreams... etc.) and I am confused in determining the differences between them. What are some examples where one stream type is preferred over another, and what are the real differences between them? ...
So, I'm feeding file data to an API that takes a Reader, and I'd like a way to report progress. It seems like it should be straightforward to write a FilterInputStream implementation that wraps the FileInputStream, keeps track of the number of bytes read vs. the total file size, and fires some event (or, calls some update() method) to r...
Does File.deleteOnExit() guarantee that the file is deleted even if the JVM is killed prematurely? ...
I have this code which reads all the files from a directory. File textFolder = new File("text_directory"); File [] texFiles = textFolder.listFiles( new FileFilter() { public boolean accept( File file ) { return file.getName().endsWith(".txt"); } }); Works great. It fills the array with...
Hello I've written small class in java to read in xml file as a string, not my question is following : how do I append string so it outputs only what is between Physical_Order_List_Array tags here is a java class : public static String getFileContent(String fileName) { BufferedReader br = null; StringBuilder sb = new Stri...
The commons FileUtils look pretty cool, and I can't believe that they cannot be made to append to a file. File file = new File(path); FileUtils.writeLines(file, printStats(new DateTime(), headerRequired)); The above just replaces the contents of the file each time, and I would just like to keep tagging this stuff to end just as this c...
I am encountering a strange issue with the commons-io/java-io. Essentially my file creation is failing silently without an exception. FileUtils.writeLines(file, collectionOfStrings); I've looked through the commons code to try and figure why this failing silently, but to me it looks like it should be throwing an exception. (See lines ...
I want to make a GUI application that contains three functions as follows: Add a record Edit a record Delete a record A record contains two fields - Name and Profession There are two restrictions for the application You can't use database to store info. You have to use a flat file. Total file should not be re-written for every add...
I want to read a file in java. And then, I want to delete a line from that file without the file being re-written. How can I do this? Someone suggested me to read/write to a file without the file being re-written with the help of RandomAccessFile. http://stackoverflow.com/questions/1984534/how-to-write-data-to-a-file-through-java Spec...
Greetings , I get huge number of records from database and write into a file.I was wondering what the best way to write huge files. (1Gb - 10Gb). Currently I am using BufferedWriter BufferedWriter mbrWriter=new BufferedWriter(new FileWriter(memberCSV)); while(done){ //do writings } mbrWriter.close(); ...