コード例 #1
0
ファイル: JavaNewIO.java プロジェクト: juniuszhou/java
  public static void main(String args[]) {
    try {
      aServer asr = new aServer();

      // file channel.
      FileInputStream is = new FileInputStream("");
      is.read();
      FileChannel cha = is.getChannel();
      ByteBuffer bf = ByteBuffer.allocate(1024);
      bf.flip();

      cha.read(bf);

      // Path Paths
      Path pth = Paths.get("", "");

      // Files some static operation.
      Files.newByteChannel(pth);
      Files.copy(pth, pth);
      // file attribute, other different class for dos and posix system.
      BasicFileAttributes bas = Files.readAttributes(pth, BasicFileAttributes.class);
      bas.size();

    } catch (Exception e) {
      System.err.println(e);
    }

    System.out.println("hello ");
  }
コード例 #2
0
ファイル: FileShared.java プロジェクト: Leph/Fileshare
  /**
   * Lis et retourne une piece depuis le fichier temporaire sur le disque (la piece doit exister)
   *
   * @param num : numéros de la piece
   */
  private synchronized byte[] readPieceTmpFile(int num) {
    if (num < 0 || num >= this.nbPieces()) {
      throw new IllegalArgumentException();
    }

    try {
      FileInputStream reader_tmp = new FileInputStream(this);
      FileChannel reader = reader_tmp.getChannel();

      int index_piece = Tools.readInt(reader, 4 + _key.length() + 4 + 4 + 4 * num);
      if (index_piece < 0) {
        throw new IllegalArgumentException();
      }

      int size = _piecesize;
      if (num == this.nbPieces() - 1) {
        size = _size - _piecesize * (this.nbPieces() - 1);
      }

      byte[] piece = Tools.readBytes(reader, this.headerSize() + _piecesize * index_piece, size);
      reader_tmp.close();

      return piece;
    } catch (Exception e) {
      System.out.println("Unable to read tmp file piece");
      e.printStackTrace();
    }
    return new byte[0];
  }
コード例 #3
0
ファイル: DoubleArrayTrie.java プロジェクト: zhoufeng/HanLP
  private boolean loadBaseAndCheckByFileChannel(String path) {
    try {
      FileInputStream fis = new FileInputStream(path);
      // 1.从FileInputStream对象获取文件通道FileChannel
      FileChannel channel = fis.getChannel();
      int fileSize = (int) channel.size();

      // 2.从通道读取文件内容
      ByteBuffer byteBuffer = ByteBuffer.allocate(fileSize);

      // channel.read(ByteBuffer) 方法就类似于 inputstream.read(byte)
      // 每次read都将读取 allocate 个字节到ByteBuffer
      channel.read(byteBuffer);
      // 注意先调用flip方法反转Buffer,再从Buffer读取数据
      byteBuffer.flip();
      // 有几种方式可以操作ByteBuffer
      // 可以将当前Buffer包含的字节数组全部读取出来
      byte[] bytes = byteBuffer.array();
      byteBuffer.clear();
      // 关闭通道和文件流
      channel.close();
      fis.close();

      int index = 0;
      size = ByteUtil.bytesHighFirstToInt(bytes, index);
      index += 4;
      base = new int[size + 65535]; // 多留一些,防止越界
      check = new int[size + 65535];
      for (int i = 0; i < size; i++) {
        base[i] = ByteUtil.bytesHighFirstToInt(bytes, index);
        index += 4;
        check[i] = ByteUtil.bytesHighFirstToInt(bytes, index);
        index += 4;
      }
    } catch (Exception e) {
      return false;
    }
    return true;
  }
コード例 #4
0
ファイル: FileShared.java プロジェクト: Leph/Fileshare
  /** Lis le header du fichier temporaire et charge ses informations */
  private void readHeaderTmpFile() {
    try {
      FileInputStream reader_tmp = new FileInputStream(this);
      FileChannel reader = reader_tmp.getChannel();

      int key_size = 0;
      int offset = 0;

      // Taile de le clef
      key_size = Tools.readInt(reader, offset);
      offset += 4;
      // Clef
      _key = Tools.readString(reader, offset, key_size);
      offset += key_size;
      // Size
      _size = Tools.readInt(reader, offset);
      offset += 4;
      // piecesize
      _piecesize = Tools.readInt(reader, offset);
      offset += 4;
      // Buffermap
      _buffermap = new Buffermap(this.nbPieces(), false);
      int i;
      for (i = 0; i < this.nbPieces(); i++) {
        int index = Tools.readInt(reader, offset);
        if (index >= 0) {
          _buffermap.setBit(i, true);
        } else {
          _buffermap.setBit(i, false);
        }
        offset += 4;
      }

      reader_tmp.close();
    } catch (Exception e) {
      System.out.println("Unable to read tmp file header");
      e.printStackTrace();
    }
  }
コード例 #5
0
ファイル: FileShared.java プロジェクト: Leph/Fileshare
  /**
   * Lis et retourne une pièce depuis le fichier complet sur le disque
   *
   * @param num : numéros de la piece
   */
  private byte[] readPieceCompleteFile(int num) {
    if (num < 0 || num >= this.nbPieces()) {
      throw new IllegalArgumentException();
    }

    try {
      FileInputStream reader_tmp = new FileInputStream(this);
      FileChannel reader = reader_tmp.getChannel();

      int size = _piecesize;
      if (num == this.nbPieces() - 1) {
        size = _size - _piecesize * (this.nbPieces() - 1);
      }

      byte[] piece = Tools.readBytes(reader, _piecesize * num, size);
      reader_tmp.close();

      return piece;
    } catch (Exception e) {
      System.out.println("Unable to read complete file piece");
      e.printStackTrace();
    }
    return new byte[0];
  }
コード例 #6
0
ファイル: HCIOTest.java プロジェクト: elambert/honeycomb
  public static void main(String[] argv) {
    if (argv.length != 3) {
      usage();
    }

    String tempFile = argv[0];
    String testFile = argv[1];
    int fileSize = Integer.valueOf(argv[2]).intValue();
    int exitcode = 0;
    int numRead;
    int numThisBuf;
    int numWritten;

    if ((fileSize <= 0) || (fileSize % 4096 != 0)) {
      System.out.println("Error: size is not a multiple of 4096!!!!!!");
      System.out.println();
      usage();
    }

    try {
      int bufSize = 4096;
      byte[] inBytes = new byte[bufSize];
      byte[] outBytes = new byte[bufSize];
      Random ioRandom = new Random(2006);
      ioRandom.nextBytes(outBytes);
      ByteBuffer inBuf = ByteBuffer.allocate(bufSize);
      ByteBuffer outBuf = ByteBuffer.wrap(outBytes);

      //
      // Loop forever
      //
      while (true) {
        //
        // Write the temporary file
        //
        FileOutputStream fos = new FileOutputStream(tempFile);
        FileChannel foc = fos.getChannel();
        numWritten = 0;
        while (numWritten < fileSize) {
          outBuf.clear(); // sets limit to capacity & position to zero
          while (outBuf.hasRemaining()) {
            numWritten += foc.write(outBuf);
          }
        }

        //
        // Move to permanent location
        //
        FileChannel srcChannel = new FileInputStream(tempFile).getChannel();
        FileChannel dstChannel = new FileOutputStream(testFile).getChannel();
        dstChannel.transferFrom(srcChannel, 0, srcChannel.size());
        srcChannel.close();
        dstChannel.close();
        boolean success = (new File(tempFile)).delete();
        if (!success) {
          System.out.println("Warning: unable to delete temporary file");
        }

        //
        // Read and compare
        //
        FileInputStream fis = new FileInputStream(testFile);
        FileChannel fic = fis.getChannel();

        for (numRead = 0, numThisBuf = 0; numRead < fileSize; numThisBuf = 0) {
          inBuf.rewind(); // Set the buffer position to 0
          numThisBuf = fic.read(inBuf);
          while (numThisBuf < bufSize) {
            numThisBuf += fic.read(inBuf);
          }
          numRead += bufSize;
          inBuf.rewind(); // Set the buffer position to 0
          inBuf.get(inBytes);
          boolean same = Arrays.equals(inBytes, outBytes);
          if (same = false) {
            System.out.println("Data read does not equal data written at " + numRead + " bytes");
          }
        }
      }

    } catch (FileNotFoundException fnfe) {
      fnfe.printStackTrace(System.err);
      exitcode = 1;
      // break;
    } catch (SecurityException se) {
      se.printStackTrace(System.err);
      exitcode = 1;
      // break;
    } catch (Throwable t) {
      t.printStackTrace(System.err);
      exitcode = 1;
    }

    System.exit(exitcode);
  }
コード例 #7
0
  Level2VolumeScan(RandomAccessFile orgRaf, CancelTask cancelTask) throws IOException {
    this.raf = orgRaf;

    if (log.isDebugEnabled()) log.debug("Level2VolumeScan on " + raf.getLocation());

    raf.seek(0);
    raf.order(RandomAccessFile.BIG_ENDIAN);

    // volume scan header
    dataFormat = raf.readString(8);
    raf.skipBytes(1);
    String volumeNo = raf.readString(3);
    title_julianDay = raf.readInt(); // since 1/1/70
    title_msecs = raf.readInt();
    stationId = raf.readString(4).trim(); // only in AR2V0001
    if (log.isDebugEnabled()) log.debug(" dataFormat= " + dataFormat + " stationId= " + stationId);

    if (stationId.length() == 0) {
      // try to get it from the filename LOOK

      stationId = null;
    }

    // try to find the station
    if (stationId != null) {
      if (!stationId.startsWith("K") && stationId.length() == 4) {
        String _stationId = "K" + stationId;
        station = NexradStationDB.get(_stationId);
      } else station = NexradStationDB.get(stationId);
    }

    // see if we have to uncompress
    if (dataFormat.equals(AR2V0001)
        || dataFormat.equals(AR2V0003)
        || dataFormat.equals(AR2V0004)
        || dataFormat.equals(AR2V0006)) {
      raf.skipBytes(4);
      String BZ = raf.readString(2);
      if (BZ.equals("BZ")) {
        RandomAccessFile uraf;
        File uncompressedFile = DiskCache.getFileStandardPolicy(raf.getLocation() + ".uncompress");

        if (uncompressedFile.exists() && uncompressedFile.length() > 0) {
          // see if its locked - another thread is writing it
          FileInputStream fstream = null;
          FileLock lock = null;
          try {
            fstream = new FileInputStream(uncompressedFile);
            // lock = fstream.getChannel().lock(0, 1, true); // wait till its unlocked

            while (true) { // loop waiting for the lock
              try {
                lock = fstream.getChannel().lock(0, 1, true); // wait till its unlocked
                break;

              } catch (OverlappingFileLockException oe) { // not sure why lock() doesnt block
                try {
                  Thread.sleep(100); // msecs
                } catch (InterruptedException e1) {
                  break;
                }
              }
            }

          } finally {
            if (lock != null) lock.release();
            if (fstream != null) fstream.close();
          }
          uraf = new ucar.unidata.io.RandomAccessFile(uncompressedFile.getPath(), "r");

        } else {
          // nope, gotta uncompress it
          uraf = uncompress(raf, uncompressedFile.getPath());
          if (log.isDebugEnabled())
            log.debug("made uncompressed file= " + uncompressedFile.getPath());
        }

        // switch to uncompressed file
        raf.close();
        raf = uraf;
        raf.order(RandomAccessFile.BIG_ENDIAN);
      }

      raf.seek(Level2Record.FILE_HEADER_SIZE);
    }

    List<Level2Record> reflectivity = new ArrayList<Level2Record>();
    List<Level2Record> doppler = new ArrayList<Level2Record>();
    List<Level2Record> highReflectivity = new ArrayList<Level2Record>();
    List<Level2Record> highVelocity = new ArrayList<Level2Record>();
    List<Level2Record> highSpectrum = new ArrayList<Level2Record>();
    List<Level2Record> highDiffReflectivity = new ArrayList<Level2Record>();
    List<Level2Record> highDiffPhase = new ArrayList<Level2Record>();
    List<Level2Record> highCorreCoefficient = new ArrayList<Level2Record>();

    long message_offset31 = 0;
    int recno = 0;
    while (true) {

      Level2Record r = Level2Record.factory(raf, recno++, message_offset31);
      if (r == null) break;
      if (showData) r.dump2(System.out);
      // skip non-data messages
      if (r.message_type == 31) {
        message_offset31 = message_offset31 + (r.message_size * 2 + 12 - 2432);
      }

      if (r.message_type != 1 && r.message_type != 31) {
        if (showMessages) r.dumpMessage(System.out);
        continue;
      }

      //  if (showData) r.dump2(System.out);

      /* skip bad
      if (!r.checkOk()) {
        r.dump(System.out);
        continue;
      }   */

      // some global params
      if (vcp == 0) vcp = r.vcp;
      if (first == null) first = r;
      last = r;

      if (runCheck && !r.checkOk()) {
        continue;
      }

      if (r.hasReflectData) reflectivity.add(r);
      if (r.hasDopplerData) doppler.add(r);

      if (r.message_type == 31) {
        if (r.hasHighResREFData) highReflectivity.add(r);
        if (r.hasHighResVELData) highVelocity.add(r);
        if (r.hasHighResSWData) highSpectrum.add(r);
        if (r.hasHighResZDRData) highDiffReflectivity.add(r);
        if (r.hasHighResPHIData) highDiffPhase.add(r);
        if (r.hasHighResRHOData) highCorreCoefficient.add(r);
      }

      if ((cancelTask != null) && cancelTask.isCancel()) return;
    }
    if (debugRadials)
      System.out.println(" reflect ok= " + reflectivity.size() + " doppler ok= " + doppler.size());
    if (highReflectivity.size() == 0) {
      reflectivityGroups = sortScans("reflect", reflectivity, 600);
      dopplerGroups = sortScans("doppler", doppler, 600);
    }
    if (highReflectivity.size() > 0)
      reflectivityHighResGroups = sortScans("reflect_HR", highReflectivity, 720);
    if (highVelocity.size() > 0)
      velocityHighResGroups = sortScans("velocity_HR", highVelocity, 720);
    if (highSpectrum.size() > 0)
      spectrumHighResGroups = sortScans("spectrum_HR", highSpectrum, 720);
    if (highDiffReflectivity.size() > 0)
      diffReflectHighResGroups = sortScans("diffReflect_HR", highDiffReflectivity, 720);
    if (highDiffPhase.size() > 0)
      diffPhaseHighResGroups = sortScans("diffPhase_HR", highDiffPhase, 720);
    if (highCorreCoefficient.size() > 0)
      coefficientHighResGroups = sortScans("coefficient_HR", highCorreCoefficient, 720);
  }