List of usage examples for java.io RandomAccessFile readChar
public final char readChar() throws IOException
From source file:Main.java
public static void main(String[] argv) throws Exception { File f = new File("filename"); RandomAccessFile raf = new RandomAccessFile(f, "rw"); // Read a character char ch = raf.readChar(); // Seek to end of file raf.seek(f.length());/*from ww w. j a v a 2 s.c om*/ // Append to the end raf.writeChars("aString"); raf.close(); }
From source file:Main.java
public static void main(String[] args) { try {// www .j ava2s . c o m int i = 70; RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); raf.writeChar(i); raf.seek(0); System.out.println(raf.readChar()); raf.seek(0); raf.writeChar(71); raf.seek(0); System.out.println(raf.readChar()); raf.close(); } catch (IOException ex) { ex.printStackTrace(); } }
From source file:Main.java
public static void main(String[] args) { try {/* w w w . j a v a 2s . c o m*/ String s = "Hello World from java2s.com"; RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); raf.writeChars(s); raf.seek(0); for (int i = 0; i < 15; i++) { System.out.println(raf.readChar()); } raf.seek(0); raf.writeChars("This is an example from java2s.com"); raf.seek(0); for (int i = 0; i < 20; i++) { System.out.println(raf.readChar()); } raf.close(); } catch (IOException ex) { ex.printStackTrace(); } }
From source file:RandomIOApp.java
public static void main(String args[]) throws IOException { RandomAccessFile file = new RandomAccessFile("test.txt", "rw"); file.writeBoolean(true);// w w w . j a va 2 s . c o m file.writeInt(123456); file.writeChar('j'); file.writeDouble(1234.56); file.seek(1); System.out.println(file.readInt()); System.out.println(file.readChar()); System.out.println(file.readDouble()); file.seek(0); System.out.println(file.readBoolean()); file.close(); }
From source file:Main.java
public static void main(String[] args) { try {/* www. j a v a 2 s. c o m*/ char c = 'J'; RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); // write something in the file raf.writeChar('A'); // set the file pointer at 0 position raf.seek(0); // read char System.out.println(raf.readChar()); // set the file pointer at 0 position raf.seek(0); // write a char at the start raf.writeChar(c); // set the file pointer at 0 position raf.seek(0); System.out.println(raf.readChar()); raf.close(); } catch (IOException ex) { ex.printStackTrace(); } }
From source file:CreateEmployeeFile.java
void read(RandomAccessFile raf) throws IOException { char[] temp = new char[15]; for (int i = 0; i < temp.length; i++) temp[i] = raf.readChar(); lastName = new String(temp); temp = new char[15]; for (int i = 0; i < temp.length; i++) temp[i] = raf.readChar();/*from w w w. j a v a2 s . co m*/ firstName = new String(temp); temp = new char[30]; for (int i = 0; i < temp.length; i++) temp[i] = raf.readChar(); address = new String(temp); age = raf.readByte(); salary = raf.readDouble(); }
From source file:big.BigZip.java
/** * Version 2 that permits to extract the text from a compressed file without * creating any file on the disk./* www .j ava2s . co m*/ * @param filePosition * @return The source code of the compressed file */ public String extractBytesToRAM(final long filePosition) { String result = null; try { // add the signature bytes to our start position long startPosition = filePosition + magicSignature.length(); // enable random access to the BIG file (fast as heck) RandomAccessFile dataBIG = new RandomAccessFile(fileMainBIG, "r"); // jump directly to the position where the file is positioned dataBIG.seek(startPosition); // create a byte array ByteArrayOutputStream byteOutput = new ByteArrayOutputStream(); // get the end of this file entry (by brute-force) char test = 0; long endPosition = -1; while (test != -1) { test = dataBIG.readChar(); // if the magic devil number was found.. if (test == 66) { // read the next value for confirmation byte value = dataBIG.readByte(); if (value != 73) { continue; } // we found the next entry endPosition = dataBIG.getFilePointer() - 1; break; } } // rewind back to the start position dataBIG.seek(startPosition); // now we start reading bytes during the mentioned interval while (dataBIG.getFilePointer() < endPosition) { // read a byte from our BIG archive int data = dataBIG.read(); byteOutput.write(data); } // flush data at this point byteOutput.flush(); // now convert the stream from input into an output (to feed the zip stream) ByteArrayInputStream byteInput = new ByteArrayInputStream(byteOutput.toByteArray()); // where we place the decompressed bytes ByteArrayOutputStream textOutput = new ByteArrayOutputStream(); // create the zip streamer final ArchiveInputStream archiveStream; archiveStream = new ArchiveStreamFactory().createArchiveInputStream("zip", byteInput); final ZipArchiveEntry entry = (ZipArchiveEntry) archiveStream.getNextEntry(); // copy all bytes from one location to the other (and decompress the data) IOUtils.copy(archiveStream, textOutput); // flush the results textOutput.flush(); // we've got the result right here! result = textOutput.toString(); // now close all the streams that we have open dataBIG.close(); byteOutput.close(); byteInput.close(); textOutput.close(); archiveStream.close(); } catch (FileNotFoundException ex) { Logger.getLogger(BigZip.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (IOException ex) { Logger.getLogger(BigZip.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (ArchiveException ex) { Logger.getLogger(BigZip.class.getName()).log(Level.SEVERE, null, ex); } return result; }