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);
}
}
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);
}
}
@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());
}
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;
}
@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;
}
/**
* 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));
}
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();
}
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;
}
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);
}
}
/**
* 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!");
}
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);
}
}
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);
}
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();
}
}
@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();
}
}
/**
* 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();
}
}
}
}
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) {
}
}
/*
* 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);
}
}
@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();
}
}
/* @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;
}
@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;
}
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);
}
}
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();
}
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);
}
}
/**
* 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);
}
}
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);
}
}
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);
}
}
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();
}
/**
* 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);
}
}
}
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();
}
/**
* 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();
}