コード例 #1
0
  public void write(Tag tag, RandomAccessFile raf, RandomAccessFile tempRaf)
      throws CannotWriteException, IOException {
    FileChannel fc = raf.getChannel();

    int oldTagSize = 0;

    if (tagExists(fc)) {
      // read the length
      if (!canOverwrite(raf))
        throw new CannotWriteException("Overwritting of this kind of ID3v2 tag not supported yet");
      fc.position(6);

      ByteBuffer buf = ByteBuffer.allocate(4);
      fc.read(buf);
      oldTagSize = (buf.get(0) & 0xFF) << 21;
      oldTagSize += (buf.get(1) & 0xFF) << 14;
      oldTagSize += (buf.get(2) & 0xFF) << 7;
      oldTagSize += buf.get(3) & 0xFF;
      oldTagSize += 10;

      // System.err.println("Old tag size: "+oldTagSize);
      int newTagSize = tc.getTagLength(tag);

      if (oldTagSize >= newTagSize) {
        // replace
        // System.err.println("Old ID32v Tag found, replacing the old
        // tag");
        fc.position(0);

        fc.write(tc.convert(tag, oldTagSize - newTagSize));

        // ID3v2 Tag Written

        return;
      }
    }

    // create new tag with padding
    // System.err.println("Creating a new ID3v2 Tag");
    fc.position(oldTagSize);

    if (fc.size() > 15 * 1024 * 1024) {
      FileChannel tempFC = tempRaf.getChannel();

      tempFC.position(0);
      tempFC.write(tc.convert(tag, Id3v2TagCreator.DEFAULT_PADDING));
      tempFC.transferFrom(fc, tempFC.position(), fc.size() - oldTagSize);

      fc.close();
    } else {
      ByteBuffer[] content = new ByteBuffer[2];

      content[1] = ByteBuffer.allocate((int) fc.size());
      fc.read(content[1]);
      content[1].rewind();
      content[0] = tc.convert(tag, Id3v2TagCreator.DEFAULT_PADDING);
      fc.position(0);
      fc.write(content);
    }
  }
コード例 #2
0
ファイル: NeoStore.java プロジェクト: soluvas/neo4j
 private void insertRecord(int recordPosition, long value) throws IOException {
   try {
     FileChannel channel = getFileChannel();
     long previousPosition = channel.position();
     channel.position(RECORD_SIZE * recordPosition);
     int trail = (int) (channel.size() - channel.position());
     ByteBuffer trailBuffer = null;
     if (trail > 0) {
       trailBuffer = ByteBuffer.allocate(trail);
       channel.read(trailBuffer);
       trailBuffer.flip();
     }
     ByteBuffer buffer = ByteBuffer.allocate(RECORD_SIZE);
     buffer.put(Record.IN_USE.byteValue());
     buffer.putLong(value);
     buffer.flip();
     channel.position(RECORD_SIZE * recordPosition);
     channel.write(buffer);
     if (trail > 0) {
       channel.write(trailBuffer);
     }
     channel.position(previousPosition);
   } catch (IOException e) {
     throw new RuntimeException(e);
   }
 }
コード例 #3
0
  @Test
  public void testAppend() throws IOException {
    RegularFile file = regularFile(0);
    FileChannel channel = channel(file, WRITE, APPEND);
    assertEquals(0, channel.position());

    ByteBuffer buf = buffer("1234567890");
    ByteBuffer buf2 = buffer("1234567890");

    assertEquals(10, channel.write(buf));
    assertEquals(10, channel.position());

    buf.flip();
    channel.position(0);
    assertEquals(20, channel.write(new ByteBuffer[] {buf, buf2}));
    assertEquals(30, channel.position());

    buf.flip();
    buf2.flip();
    channel.position(0);
    assertEquals(20, channel.write(new ByteBuffer[] {buf, buf2}, 0, 2));
    assertEquals(50, channel.position());

    buf.flip();
    channel.position(0);
    assertEquals(10, channel.write(buf, 5));
    assertEquals(60, channel.position());

    buf.flip();
    channel.position(0);
    assertEquals(10, channel.transferFrom(new ByteBufferChannel(buf), 0, 10));
    assertEquals(70, channel.position());
  }
コード例 #4
0
 public int write(ByteBuffer src) throws IOException {
   if (filePointer >= length && filePointer > maxLength) {
     // may need to extend and create files
     long oldFilePointer = filePointer;
     long x = length - (length % maxLength) + maxLength;
     for (; x < filePointer; x += maxLength) {
       if (x > length) {
         // expand the file size
         position(x - 1);
         write(ByteBuffer.wrap(new byte[1]));
       }
       filePointer = oldFilePointer;
     }
   }
   long offset = filePointer % maxLength;
   int len = src.remaining();
   FileChannel channel = getFileChannel();
   channel.position(offset);
   int l = (int) Math.min(len, maxLength - offset);
   if (l == len) {
     l = channel.write(src);
   } else {
     int oldLimit = src.limit();
     src.limit(src.position() + l);
     l = channel.write(src);
     src.limit(oldLimit);
   }
   filePointer += l;
   length = Math.max(length, filePointer);
   return l;
 }
コード例 #5
0
  @Override
  public boolean renameTo(File dest) throws IOException {
    if (dest == null) {
      throw new NullPointerException("dest");
    }
    if (byteBuf == null) {
      // empty file
      dest.createNewFile();
      isRenamed = true;
      return true;
    }
    int length = byteBuf.readableBytes();
    FileOutputStream outputStream = new FileOutputStream(dest);
    FileChannel fileChannel = outputStream.getChannel();
    int written = 0;
    if (byteBuf.nioBufferCount() == 1) {
      ByteBuffer byteBuffer = byteBuf.nioBuffer();
      while (written < length) {
        written += fileChannel.write(byteBuffer);
      }
    } else {
      ByteBuffer[] byteBuffers = byteBuf.nioBuffers();
      while (written < length) {
        written += fileChannel.write(byteBuffers);
      }
    }

    fileChannel.force(false);
    fileChannel.close();
    outputStream.close();
    isRenamed = true;
    return written == length;
  }
コード例 #6
0
  /**
   * 使用FileChannel写2G大文件
   *
   * @throws IOException
   */
  public static void writeBiFileByFileChannel() throws IOException {
    long start = System.currentTimeMillis();

    File fcFile = new File("fc.dat");
    if (fcFile.exists()) {
      fcFile.delete();
    }
    RandomAccessFile raf = new RandomAccessFile(fcFile, "rw");
    FileChannel fileChannel = raf.getChannel();

    byte[] data = null;
    long len = LEN;
    ByteBuffer byteBuffer = ByteBuffer.allocate(DATA_CHUNK);
    int dataChunk = DATA_CHUNK / (1024 * 1024);
    while (len >= DATA_CHUNK) {
      System.out.println("write a data chunk:" + dataChunk + "MB");

      byteBuffer.clear();
      data = new byte[DATA_CHUNK];
      for (int i = 0; i < DATA_CHUNK; i++) {
        byteBuffer.put(data[i]);
      }
      data = null;

      byteBuffer.flip();
      fileChannel.write(byteBuffer);
      fileChannel.force(true);

      len -= DATA_CHUNK;
    }

    if (len > 0) {
      System.out.println("write rest data chunk:" + len + "B");
      byteBuffer = ByteBuffer.allocateDirect((int) len);
      data = new byte[(int) len];
      for (int i = 0; i < len; i++) {
        byteBuffer.put(data[i]);
      }

      byteBuffer.flip();
      fileChannel.write(byteBuffer);
      fileChannel.force(true);
      data = null;
    }

    // 关闭文件和通道流
    fileChannel.close();
    raf.close();

    long end = System.currentTimeMillis();
    System.out.println(String.format("===>写2G文件 " + fcFile.getName() + " 耗时:%s毫秒", end - start));
  }
コード例 #7
0
ファイル: DDSImage.java プロジェクト: shamanDevel/shaman.rpg
 public void write(FileOutputStream fos) throws IOException {
   FileChannel chan = fos.getChannel();
   // Create ByteBuffer for header in case the start of our
   // ByteBuffer isn't actually memory-mapped
   ByteBuffer hdr = ByteBuffer.allocate(Header.writtenSize());
   hdr.order(ByteOrder.LITTLE_ENDIAN);
   header.write(hdr);
   hdr.rewind();
   chan.write(hdr);
   buf.position(Header.writtenSize());
   chan.write(buf);
   chan.force(true);
   chan.close();
 }
コード例 #8
0
ファイル: FileUtil.java プロジェクト: wangjun/DownloadLib
  public static boolean createFile(File file, long fileLength) {
    FileOutputStream fos = null;
    try {

      if (!file.exists()) {
        boolean ret = file.createNewFile();
        if (!ret) return false;
      }

      long batchSize = 0;
      batchSize = fileLength;
      if (fileLength > KBSIZE) {
        batchSize = KBSIZE;
      }
      if (fileLength > MBSIZE1) {
        batchSize = MBSIZE1;
      }
      if (fileLength > MBSIZE10) {
        batchSize = MBSIZE10;
      }
      long count = fileLength / batchSize;
      long last = fileLength % batchSize;

      fos = new FileOutputStream(file);
      FileChannel fileChannel = fos.getChannel();
      for (int i = 0; i < count; i++) {
        ByteBuffer buffer = ByteBuffer.allocate((int) batchSize);
        fileChannel.write(buffer);
      }
      ByteBuffer buffer = ByteBuffer.allocate((int) last);
      fileChannel.write(buffer);

      fos.close();
      return true;

    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (fos != null) {
          fos.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return false;
  }
コード例 #9
0
 public void write(
     String path, ReadableByteChannel data, ByteBuffer temporaryBuffer, boolean hasData)
     throws IOException {
   try {
     File file = new File(basePath, path);
     RandomAccessFile randomAccessFile = null;
     try {
       file.getParentFile().mkdirs();
       randomAccessFile = new RandomAccessFile(file, "rw");
       if (hasData) {
         FileChannel channel = randomAccessFile.getChannel();
         while (data.read(temporaryBuffer) >= 0) {
           temporaryBuffer.flip();
           channel.write(temporaryBuffer);
           temporaryBuffer.clear();
         }
       }
     } finally {
       if (randomAccessFile != null) {
         randomAccessFile.close();
       }
     }
   } catch (Throwable t) {
     t.printStackTrace();
     throw new IOException(t);
   }
 }
コード例 #10
0
  /**
   * 使用FileChannel写文件
   *
   * @throws IOException
   */
  public static void writeByFileChannel() throws IOException {
    File file = new File("FileChannelWriterTest.txt");
    if (file.exists()) {
      file.delete();
    }

    FileOutputStream fos = new FileOutputStream(file);
    // 得到文件通道
    FileChannel channel = fos.getChannel();

    // 指定大小为1024的缓冲区
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    // 要写入文件的字符串
    String greeting = "Hello Java NIO!";

    // 把以上字符串逐字放入缓冲区
    //		for(int i = 0; i < greeting.length(); i++){
    //			buffer.putChar(greeting.charAt(i));
    //		}

    // 把以上字符一次性放入缓冲区
    buffer.put(greeting.getBytes());

    // 反转buffer
    buffer.flip();

    // 缓冲区数据写入文件中
    channel.write(buffer);

    // 关闭文件和通道流
    channel.close();
    fos.close();
    System.out.println("Write file " + file.getName() + " Successfully!");
  }
コード例 #11
0
ファイル: FilePersister.java プロジェクト: nothize/suite
  public void save(int pageNo, B_Tree.Page<Key> page) {
    try {
      ByteBuffer buffer = ByteBuffer.allocate(pageSize);
      List<B_Tree.KeyPointer<Key>> ptrs = page.keyPointers;
      boolean isBranch = !ptrs.isEmpty() && ptrs.get(0).t2 instanceof B_Tree.Branch;

      buffer.putChar(isBranch ? INTERNAL : LEAF);
      buffer.putInt(ptrs.size());

      for (B_Tree.KeyPointer<Key> keyPtr : ptrs) {
        keyAccessor.write(buffer, keyPtr.t1);

        if (keyPtr.t2 instanceof B_Tree.Branch) {
          int branch = ((B_Tree.Branch) keyPtr.t2).branch;
          buffer.putInt(branch);
        } else if (keyPtr.t2 instanceof B_Tree.Leaf) {
          @SuppressWarnings("unchecked")
          Value value = ((B_Tree.Leaf<Value>) keyPtr.t2).value;
          valueAccessor.write(buffer, value);
        }
      }

      buffer.flip();
      channel.write(buffer, pageNo * pageSize);
    } catch (IOException ex) {
      throw new RuntimeException(ex);
    }
  }
コード例 #12
0
 private static void writeFully(FileChannel file, long pos, ByteBuffer src) throws IOException {
   int off = 0;
   do {
     int len = file.write(src, pos + off);
     off += len;
   } while (src.remaining() > 0);
 }
コード例 #13
0
  public static DataFileAccessorImpl create(
      final File file, final Date startDate, final Date endDate) throws Exception {
    logger.debug("Creating new file: {}", file);

    if (!file.createNewFile()) {
      throw new IllegalStateException(
          String.format("Unable to create file %s, already exists", file));
    }

    final FileOutputStream out = new FileOutputStream(file);

    try {
      final FileChannel channel = out.getChannel();

      final ByteBuffer buffer = ByteBuffer.allocate(100);
      buffer.putInt(0x1202); // magic marker
      buffer.putInt(0x0101); // version
      buffer.putLong(startDate.getTime()); // start timestamp
      buffer.putLong(endDate.getTime()); // end timestamp

      buffer.flip();

      while (buffer.hasRemaining()) {
        final int rc = channel.write(buffer);
        logger.debug("Header written - {} bytes", rc);
      }

      return new DataFileAccessorImpl(file);
    } finally {
      out.close();
    }
  }
コード例 #14
0
 @Override
 public void close() throws IOException, InterruptedException {
   try {
     m_outstandingWriteTasksLock.lock();
     try {
       while (m_outstandingWriteTasks.get() > 0) {
         m_noMoreOutstandingWriteTasksCondition.await();
       }
     } finally {
       m_outstandingWriteTasksLock.unlock();
     }
     m_syncTask.cancel(false);
     m_channel.force(false);
   } finally {
     m_bytesAllowedBeforeSync.release(m_bytesWrittenSinceLastSync.getAndSet(0));
   }
   m_channel.position(8);
   ByteBuffer completed = ByteBuffer.allocate(1);
   if (m_writeFailed) {
     completed.put((byte) 0).flip();
   } else {
     completed.put((byte) 1).flip();
   }
   m_channel.write(completed);
   m_channel.force(false);
   m_channel.close();
   if (m_onCloseHandler != null) {
     m_onCloseHandler.run();
   }
 }
コード例 #15
0
ファイル: Utility.java プロジェクト: zhangyutao/vautotest
 /**
  * transfer Stream
  *
  * @param ins
  * @param targetChannel
  */
 private static void transferStream(InputStream ins, FileChannel targetChannel) {
   ByteBuffer byteBuffer = ByteBuffer.allocate(1024 * 10);
   ReadableByteChannel rbcInst = Channels.newChannel(ins);
   try {
     while (-1 != (rbcInst.read(byteBuffer))) {
       byteBuffer.flip();
       targetChannel.write(byteBuffer);
       byteBuffer.clear();
     }
   } catch (IOException ioe) {
     ioe.printStackTrace();
   } finally {
     if (null != rbcInst) {
       try {
         rbcInst.close();
       } catch (IOException e) {
         e.printStackTrace();
       }
     }
     if (null != targetChannel) {
       try {
         targetChannel.close();
       } catch (IOException e) {
         e.printStackTrace();
       }
     }
   }
 }
コード例 #16
0
  public static void writeByteBuffer(ByteBuffer bbuf, String filename) {
    // Write bbuf to filename
    File file;
    try {
      // Get log file
      String logfile = "C:\\" + filename + ".txt";
      file = new File(logfile);
      boolean exists = file.exists();
      if (!exists) {
        // create a new, empty node file
        try {
          file = new File(logfile);
          boolean success = file.createNewFile();
        } catch (IOException e) {
          System.out.println("Create Event Log file failed!");
        }
      }
      try {
        // Create a writable file channel
        FileChannel wChannel = new FileOutputStream(file, true).getChannel();
        // Write the ByteBuffer contents; the bytes between the ByteBuffer's
        // position and the limit is written to the file
        wChannel.write(bbuf);

        // Close the file
        wChannel.close();
      } catch (IOException e) {
      }
    } catch (java.lang.Exception e) {
    }
  }
コード例 #17
0
  /*
   * Creates a file at filename if file doesn't exist. Writes
   * value to that file using FileChannel.
   */
  public static void writeToFile(File filename, String value, String hideCommand)
      throws IOException, InterruptedException {
    if (!hideCommand.trim().equals("")) {
      // unhideFile(filename);
    }

    if (!filename.exists()) {
      filename.createNewFile();
    }

    byte[] bytes = value.getBytes();
    ByteBuffer buffer = ByteBuffer.allocate(bytes.length);
    for (int i = 0; i < bytes.length; i++) {
      buffer.put(bytes[i]);
    }
    buffer.rewind();

    try {

      fileWriter = new FileOutputStream(filename).getChannel();
      fileWriter.write(buffer);
    } finally {
      fileWriter.close();
    }

    if (!hideCommand.trim().equals("")) {
      // hideFile(filename);
    }
  }
コード例 #18
0
  @Override
  public void clear() {
    resizeLock.writeLock().lock();
    try {
      synchronized (entries) {
        synchronized (freeList) {
          // wait until all readers are done reading file entries
          for (FileEntry fe : entries.values()) fe.waitUnlocked();
          for (FileEntry fe : freeList) fe.waitUnlocked();

          // clear in-memory state
          entries.clear();
          freeList.clear();

          // reset file
          if (trace) log.tracef("Truncating file, current size is %d", filePos);
          channel.truncate(0);
          channel.write(ByteBuffer.wrap(MAGIC), 0);
          filePos = MAGIC.length;
        }
      }
    } catch (Exception e) {
      throw new PersistenceException(e);
    } finally {
      resizeLock.writeLock().unlock();
    }
  }
コード例 #19
0
ファイル: NIOFileHandle.java プロジェクト: sbesson/bioformats
 /* @see IRandomAccess.write(ByteBuffer, int, int) */
 public void write(ByteBuffer buf, int off, int len) throws IOException {
   writeSetup(len);
   buf.limit(off + len);
   buf.position(off);
   position += channel.write(buf, position);
   buffer = null;
 }
コード例 #20
0
ファイル: StorageFcByteBuf.java プロジェクト: jimdowling/gvod
  @Override
  public boolean putSubpiece(int piece, byte[] bs) throws IOException {
    // First check if the piece is correct.
    // If we were paranoid we could copy the array first.

    synchronized (bitfield) {
      if (bitfield.get(piece)) {
        return true; // No need to store twice.
      } else {
        bitfield.set(piece, false);
        needed--;
      }
    }
    assert (this.length != 0);
    int start = piece * metainfo.getSubpieceSize(0);
    FileChannel fc = getFileChannel();

    long raflen = this.length;
    while (start > raflen) {
      start -= raflen;
    }

    ByteBuffer bb = ByteBuffer.wrap(bs);
    fc.position(start);
    while (bb.hasRemaining()) {
      fc.write(bb);
    }

    return true;
  }
コード例 #21
0
ファイル: LogSegmentTest.java プロジェクト: xiahome/ambry
 private void writeHeader(LogSegment segment, byte[] buf) throws IOException {
   FileChannel channel = segment.getView().getSecond();
   ByteBuffer buffer = ByteBuffer.wrap(buf);
   while (buffer.hasRemaining()) {
     channel.write(buffer, 0);
   }
 }
コード例 #22
0
ファイル: ChannelTester.java プロジェクト: VAEAZE/trunk
  public static void main(String[] args) throws IOException {
    System.err.println(df.format(new Date(System.currentTimeMillis())));

    File rfile = new File("D:/TDDOWNLOAD/17173_SC2-WingsOfLiberty-zhCN-Installer.rar");
    File wfile = new File("E:/17173_SC2-WingsOfLiberty-zhCN-InstallerCopy.rar");

    FileChannel rchannel = new FileInputStream(rfile).getChannel();
    FileChannel wchannel = new FileOutputStream(wfile).getChannel();
    ByteBuffer[] buffers = new ByteBuffer[1024];

    for (int i = 0; i < buffers.length; i++) {
      buffers[i] = ByteBuffer.allocate(1024);
    }
    boolean isLoop = true;
    while (isLoop) {
      for (ByteBuffer buffer : buffers) {
        buffer.rewind();
      }
      isLoop = rchannel.read(buffers) != -1L;
      for (ByteBuffer buffer : buffers) {
        buffer.flip();
      }
      wchannel.write(buffers);
    }
    rchannel.close();
    wchannel.close();
  }
コード例 #23
0
ファイル: FileUtils.java プロジェクト: helloyzy/UtilLib
  public static void copyFile(File srcFile, File destFile) throws Exception {
    int bufferSize = 2048;

    FileInputStream in = new FileInputStream(srcFile);
    FileOutputStream out = new FileOutputStream(destFile);
    FileChannel inChannel = in.getChannel();
    FileChannel outChannel = out.getChannel();

    ByteBuffer buffer = null;
    int length = -1;
    try {
      while (true) {
        if (inChannel.position() == inChannel.size()) {
          // finish copying
          break;
        } else if (inChannel.size() - inChannel.position() < length) {
          // copy last chunk of data
          length = (int) (inChannel.size() - inChannel.position());
        } else {
          length = bufferSize;
        }

        buffer = ByteBuffer.allocateDirect(length);
        inChannel.read(buffer);
        buffer.flip();
        outChannel.write(buffer);
        outChannel.force(false);
      }
    } finally {
      _close(inChannel);
      _close(in);
      _close(outChannel);
      _close(out);
    }
  }
コード例 #24
0
ファイル: IOUtils.java プロジェクト: hwdlei/common-utils
 /**
  * 监测复制进度(留意buffer的大小,对速度有很大影响)
  *
  * @param source
  * @param target
  */
 public static void nioBufferCopy(File source, File target) {
   FileChannel in = null;
   FileChannel out = null;
   FileInputStream inStream = null;
   FileOutputStream outStream = null;
   try {
     inStream = new FileInputStream(source);
     outStream = new FileOutputStream(target);
     in = inStream.getChannel();
     out = outStream.getChannel();
     ByteBuffer buffer = ByteBuffer.allocate(4096);
     while (in.read(buffer) != -1) {
       buffer.flip();
       out.write(buffer);
       buffer.clear();
     }
   } catch (IOException e) {
     e.printStackTrace();
   } finally {
     close(inStream);
     close(in);
     close(outStream);
     close(out);
   }
 }
コード例 #25
0
ファイル: FileUtil.java プロジェクト: lotomer/tomstools
 public static void saveFile(File file, String content, String charsetName) {
   // if (Utils.isEmpty(fileName) || Utils.isEmpty(content)) {
   // return;
   // }
   // logger.info("save file:" + fileName + " charset:" + charsetName);
   file.getParentFile().mkdirs();
   Charset cs;
   if (null == charsetName || "".equals(charsetName)) {
     cs = Charset.defaultCharset();
   } else {
     cs = Charset.forName(charsetName);
   }
   CharsetEncoder encoder = cs.newEncoder();
   FileOutputStream os = null;
   FileChannel out = null;
   try {
     os = new FileOutputStream(file);
     out = os.getChannel();
     out.write(encoder.encode(CharBuffer.wrap(content)));
   } catch (CharacterCodingException e) {
     e.printStackTrace();
   } catch (IOException e) {
     e.printStackTrace();
   } finally {
     close(out);
     close(os);
   }
 }
コード例 #26
0
ファイル: SHA1Verification.java プロジェクト: aprasa/oldwork
  public static void createTestFiles() {
    try {
      System.out.println("Creating test files ... ");
      Random rand = new Random();
      String rootname = "f-";

      long[] sizes = {0, 1, 50000000};

      File testdir = new File(dirname);
      FileUtil.mkdirs(testdir);

      for (int i = 0; i < sizes.length; i++) {
        long size = sizes[i];
        File file = new File(testdir, rootname + String.valueOf(size));
        System.out.println(file.getName() + "...");
        FileChannel fc = new RandomAccessFile(file, "rw").getChannel();

        long position = 0;
        while (position < size) {
          long remaining = size - position;
          if (remaining > 1024000) remaining = 1024000;
          byte[] buffer = new byte[new Long(remaining).intValue()];
          rand.nextBytes(buffer);
          ByteBuffer bb = ByteBuffer.wrap(buffer);
          position += fc.write(bb);
        }

        fc.close();
      }
      System.out.println("DONE\n");
    } catch (Exception e) {
      Debug.printStackTrace(e);
    }
  }
コード例 #27
0
ファイル: UseCharsets.java プロジェクト: clonegod/app-samples
  public static void main(String args[]) throws Exception {
    String inputFile = "samplein.txt";
    String outputFile = "sampleout.txt";

    RandomAccessFile inf = new RandomAccessFile(inputFile, "r");
    RandomAccessFile outf = new RandomAccessFile(outputFile, "rw");
    long inputLength = new File(inputFile).length();

    FileChannel inc = inf.getChannel();
    FileChannel outc = outf.getChannel();

    MappedByteBuffer inputData = inc.map(FileChannel.MapMode.READ_ONLY, 0, inputLength);

    Charset latin1 = Charset.forName("ISO-8859-1");
    CharsetDecoder decoder = latin1.newDecoder();
    CharsetEncoder encoder = latin1.newEncoder();

    CharBuffer cb = decoder.decode(inputData);

    // Process char data here

    ByteBuffer outputData = encoder.encode(cb);

    outc.write(outputData);

    inf.close();
    outf.close();
  }
コード例 #28
0
ファイル: NeoStore.java プロジェクト: soluvas/neo4j
 /**
  * Sets the version for the given neostore file in {@code storeDir}.
  *
  * @param storeDir the store dir to locate the neostore file in.
  * @param version the version to set.
  * @return the previous version before writing.
  */
 public static long setVersion(String storeDir, long version) {
   RandomAccessFile file = null;
   try {
     file = new RandomAccessFile(new File(storeDir, NeoStore.DEFAULT_NAME), "rw");
     FileChannel channel = file.getChannel();
     channel.position(RECORD_SIZE * 2 + 1 /*inUse*/);
     ByteBuffer buffer = ByteBuffer.allocate(8);
     channel.read(buffer);
     buffer.flip();
     long previous = buffer.getLong();
     channel.position(RECORD_SIZE * 2 + 1 /*inUse*/);
     buffer.clear();
     buffer.putLong(version).flip();
     channel.write(buffer);
     return previous;
   } catch (IOException e) {
     throw new RuntimeException(e);
   } finally {
     try {
       if (file != null) file.close();
     } catch (IOException e) {
       throw new RuntimeException(e);
     }
   }
 }
コード例 #29
0
 void save() throws Exception {
   ByteBuffer buffer = ByteBuffer.allocate(1);
   buffer.put(rootPage.getUnique() ? (byte) 1 : (byte) 0);
   buffer.position(0);
   raFile.write(buffer);
   ((FileIndexNode) rootPage).save();
 }
コード例 #30
0
ファイル: IOUtil.java プロジェクト: PennState/directory-kerby
  /**
   * Write a file with the content assuming UTF8.
   *
   * @param content The content
   * @param file The file to write
   * @throws IOException e
   */
  public static void writeFile(String content, File file) throws IOException {
    FileOutputStream outputStream = new FileOutputStream(file);
    FileChannel fc = outputStream.getChannel();

    ByteBuffer buffer = ByteBuffer.wrap(Utf8.toBytes(content));
    fc.write(buffer);
    outputStream.close();
  }