| 11 | private static String name = "data.txt"; |
| 12 | private static final int BSIZE = 1024; |
| 13 | public static void main(String[] args) { |
| 14 | // Write a file: |
| 15 | try( |
| 16 | FileChannel fc = new FileOutputStream(name) |
| 17 | .getChannel() |
| 18 | ) { |
| 19 | fc.write(ByteBuffer |
| 20 | .wrap("Some text ".getBytes())); |
| 21 | } catch(IOException e) { |
| 22 | throw new RuntimeException(e); |
| 23 | } |
| 24 | // Add to the end of the file: |
| 25 | try( |
| 26 | FileChannel fc = new RandomAccessFile( |
| 27 | name, "rw").getChannel() |
| 28 | ) { |
| 29 | fc.position(fc.size()); // Move to the end |
| 30 | fc.write(ByteBuffer |
| 31 | .wrap("Some more".getBytes())); |
| 32 | } catch(IOException e) { |
| 33 | throw new RuntimeException(e); |
| 34 | } |
| 35 | // Read the file: |
| 36 | try( |
| 37 | FileChannel fc = new FileInputStream(name) |
| 38 | .getChannel() |
| 39 | ) { |
| 40 | ByteBuffer buff = ByteBuffer.allocate(BSIZE); |
| 41 | fc.read(buff); |
| 42 | buff.flip(); |
| 43 | while(buff.hasRemaining()) |
| 44 | System.out.write(buff.get()); |
| 45 | } catch(IOException e) { |
| 46 | throw new RuntimeException(e); |
| 47 | } |
| 48 | System.out.flush(); |
| 49 | } |
| 50 | } |
| 51 | /* Output: |
| 52 | Some text Some more |