/** * Appends a string to the file and returns the offset of the start of the string. * * @param str the string to be written. * @return the offset of the start of the string that was written. * @throws IOException if an I/O error occurs or the offset would be larger than 2^32-1. */ private long writeString(String str) throws IOException { // Write the string at the end of the file. long pos = stringFile.length(); if (pos > MASK32) throw new IOException("String file too large"); stringFile.seek(pos); stringFile.writeUTF(str); return pos; }
/** * Writes the Item Code to the Items Random Access File * * @param file - the Items Random Access File */ private void writeCodeToFile(RandomAccessFile file) { String code = getCode(); while (code.length() != 6) { code = "0" + code; } try { file.writeUTF(code); } catch (Exception e) { } }
public static void main(String args[]) { try { String fname = "d:\\q.txt"; String mode; // mode = "r";//r : file must exist mode = "rw"; // rw : file will be created or opened // open the file RandomAccessFile raf = new RandomAccessFile(fname, mode); /* //seek and write demo raf.seek(10);//position file r/w pointer at index 10 wrt BOF //a seek beyond file size causes file to grow upto the seek value raf.write(65);//raf.write('A'); */ // r/w java datatypes int i1, i2; float f1, f2; char c1, c2; String s1, s2; i1 = -10; f1 = 1234.5678F; c1 = 'q'; s1 = "hello files"; raf.seek(0); // reach BOF raf.writeInt(i1); raf.writeFloat(f1); raf.writeChar(c1); raf.writeUTF(s1); raf.seek(0); // reach BOF i2 = raf.readInt(); f2 = raf.readFloat(); c2 = raf.readChar(); s2 = raf.readUTF(); System.out.println(i2); System.out.println(f2); System.out.println(c2); System.out.println(s2); // close the file raf.close(); } catch (IOException ex) { System.out.println(ex); // ex converts into ex.toString() } } // main
/** * Writes the username of the user that created the Item to the Items Random Access File * * @param file- the Item's Random Access File */ private void writeCreatedBy(RandomAccessFile file) { String createdBy = getCreatedBy(); try { while (createdBy.length() != 20) { createdBy = createdBy + " "; } file.writeUTF(createdBy); } catch (Exception e) { } }
/** * Writes the Item Name to the Items Random Access File * * @param file - the Items Random Access File */ private void writeNameToFile(RandomAccessFile file) { String name = getName(); while (name.length() != 200) { name = name + " "; } try { file.writeUTF(name); } catch (Exception e) { } }
/** * Writes the Item description to the Items Random Access File * * @param file - the Items Random Access File */ private void writeDescriptionToFile(RandomAccessFile file) { String description = getDescription(); if (description == null || description.equals("")) { // As description is optional description = "<No description>"; } while (description.length() != 200) { description = description + " "; } try { file.writeUTF(description); } catch (Exception e) { } }
public My_Room_AC_db(String name) { y = new ArrayList<String>(); try { raf = new RandomAccessFile("ac_db.dat", "r"); String arr2[] = name.split("#"); while (true) { String rec = raf.readUTF(); String arr[] = rec.split("#"); if (arr[0].equals(arr2[0])) { y.add(name); } else { y.add(rec); } } } catch (Exception ep) { } finally { try { // if(raf!=null) raf.close(); File f = new File("ac_db.dat", "r"); f.delete(); } catch (Exception ex) { } } raf = null; try { raf = new RandomAccessFile("ac_db.dat", "rw"); for (String ss : y) { raf.writeUTF(ss); } } catch (Exception ef) { } finally { try { raf.close(); } catch (Exception ex) { } } }
public boolean writeObj(Object obj, String fileName) { RandomAccessFile file = null; if (!this.configDirExists(fileName)) { return false; } try { file = new RandomAccessFile(fileName, "rw"); String xml = xstream.toXML(obj); file.writeUTF(xml); } catch (IOException ex) { ex.printStackTrace(); return false; } finally { try { file.close(); } catch (IOException ex) { Logger.getLogger(ConfigLoader.class.getName()).log(Level.SEVERE, null, ex); } } return true; }