bufferedwriter

In android, I am writing a file on clicking a button and on clicking next time, it saves the file and closes the buffered writer. But, I also want to implement functionality to close the buffered writer in onDestroy function. Before that I need to know if Bufferedwriter is already closed. How will I check if Buffered Writer is already closed? In addition to that, does bufferedWriter.close() function set bufferedWriter to null ? Calling close method on already closed Writer has no impact. Still, if you want to know if the Writer is closed, you can call writer.flush() , if it throws IOException

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(); If you really insist using Java for this, then the best way would be to write immediately as soon as the data comes in and thus not to collect all the data from ResultSet into Java's memory first. You would need at least that much of free memory in Java otherwise. Thus, do e.g. while (resultSet

I want to write a file results.txt to a specific directory on my machine (Z:\results to be precise). How do I go about specifying the directory to BufferedWriter/FileWriter? Currently, it writes the file successfully but to the directory where my source code is located. Thanks public void writefile(){ try{ Writer output = null; File file = new File("results.txt"); output = new BufferedWriter(new FileWriter(file)); for(int i=0; i<100; i++){ //CODE TO FETCH RESULTS AND WRITE FILE } output.close(); System.out.println("File has been written"); }catch(Exception e){ System.out.println("Could not

I am saving a log to a .txt file on the sdcard but once there is two lines saved, it overwrites it and starts over? Here is my code: public static String getTimestamp() { try { SimpleDateFormat dateFormat = new SimpleDateFormat("MMMdd HH:mm:ss", Locale.getDefault()); String currentTimeStamp = dateFormat.format(new Date()); // Find todays date return currentTimeStamp; } catch (Exception e) { e.printStackTrace(); return null; } } public static void writeToLog(Context context, String string) { String text = getTimestamp() + " " + string; // ONLY SAVES TWO LINES try { PrintWriter out = new

I'm trying to write sample file from applet but is not working. Below is the code. Applet public class PasteImageApplet extends JApplet { Clipboard clipboard; Toolkit toolkit; JLabel lbl; public String getClipboardImageURL(String server) { lbl.setText("pasting image"); String url = ""; try { DataFlavor dataFlavor = DataFlavor.imageFlavor; System.out.println(dataFlavor.getDefaultRepresentationClass()); Object object = null; try { object = clipboard.getContents(null) .getTransferData(dataFlavor); JOptionPane.showMessageDialog(null,"Image found."); try { Writer output = null; String text = "Test

I have this line of code in java: new BufferedWriter(new OutputStreamWriter(new FileOutputStream(name, append), "UTF-8")); This writer does not write an UTF-8 file, because when I open it in notepad++ it says that the encoding is: ANSI as UTF-8. I need it to be pure UTF-8. Do you have any suggestions? notepad++ (and any other tool) can only guess the encoding, it's not written anywhere in your file (or in some metadata). And if the text you've written doesn't contain any characters outside the ASCII range (i.e. no character with a Unicode codepoint > 127), then a file with ANSI encoding is

try { File file = new File(filePath+"usedcommands.txt"); if (!file.exists()) { file.createNewFile(); } FileWriter fw = new FileWriter(file.getAbsoluteFile()); BufferedWriter bw = new BufferedWriter(fw); bw.write(input+"\n"); bw.close(); } catch(Exception e) { System.out.println("can't write to usedcommands.txt..."); } I'm writing to a txt file, but every time I run through the writing process it overrides what is already written there. How can I change my code so this part of the program doesn't override what is already there? Pass true as a second argument to FileWriter to turn on "append"