java.lang.Object
- org.meteoinfo.common.io.RandomAccessFile

所有已实现的接口:

DataInput, DataOutput
```
public class RandomAccessFile
extends Object
implements DataInput, DataOutput
```
A buffered drop-in replacement for java.io.RandomAccessFile. Instances of this class realise substantial speed increases over java.io.RandomAccessFile through the use of buffering. This is a subclass of Object, as it was not possible to subclass java.io.RandomAccessFile because many of the methods are final. However, if it is necessary to use RandomAccessFile and java.io.RandomAccessFile interchangeably, both classes implement the DataInput and DataOutput interfaces.

By Russ Rew, based on BufferedRandomAccessFile by Alex McManus, based on Sun's source code for java.io.RandomAccessFile. For Alex McManus version from which this derives, see his Freeware Java Classes.

作者:

Alex McManus, Russ Rew, john caron

另请参阅:

DataInput, DataOutput, RandomAccessFile

字段概要

字段
修饰符和类型	字段	说明
`protected static Set<String>`	`allFiles`
`static int`	`BIG_ENDIAN`
`protected boolean`	`bigEndian`	The current endian (big or little) mode of the file.
`protected byte[]`	`buffer`	The buffer used for reading the data.
`protected long`	`bufferStart`	The offset in bytes of the start of the buffer, from the start of the file.
`protected long`	`dataEnd`	The offset in bytes of the end of the data in the buffer, from the start of the file.
`protected int`	`dataSize`	The size of the data stored in the buffer, in bytes.
`protected static boolean`	`debugAccess`
`protected static boolean`	`debugLeaks`
`protected static int`	`defaultBufferSize`	The default buffer size, in bytes.
`protected boolean`	`endOfFile`	True if we are at the end of the file.
`protected RandomAccessFile`	`file`	The underlying java.io.RandomAccessFile.
`protected FileChannel`	`fileChannel`
`protected long`	`filePosition`	The offset in bytes from the file start, of the next read or write operation.
`static int`	`LITTLE_ENDIAN`
`protected String`	`location`	File location
`protected static List<String>`	`openFiles`
`protected boolean`	`readonly`	The access mode of the file.
`protected static boolean`	`showOpen`
`protected static boolean`	`showRead`

构造器概要

构造器
限定符	构造器	说明
`protected`	`RandomAccessFile(int bufferSize)`	Constructor, for subclasses
	`RandomAccessFile(String location, String mode)`	Constructor, default buffer size.
	`RandomAccessFile(String location, String mode, int bufferSize)`	Constructor.

方法概要

所有方法静态方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`close()`	Close the file, and release any associated system resources.
`void`	`flush()`	Copy the contents of the buffer to the disk.
`static List<String>`	`getAllFiles()`
`int`	`getBufferSize()`	Get the buffer size
`static boolean`	`getDebugLeaks()`	Debugging, do not use.
`static long`	`getDebugNbytes()`
`static int`	`getDebugNseeks()`
`FileDescriptor`	`getFD()`	Returns the opaque file descriptor object associated with this file.
`long`	`getFilePointer()`	Returns the current position in the file, where the next read or write will occur.
`String`	`getLocation()`	Get the file location, or name.
`static List<String>`	`getOpenFiles()`	Debugging, do not use.
`RandomAccessFile`	`getRandomAccessFile()`	Allow access to the underlying java.io.RandomAccessFile.
`boolean`	`isAtEndOfFile()`	Return true if file pointer is at end of file.
`long`	`length()`	Get the length of the file.
`void`	`order(int endian)`	Change the current endian mode.
`int`	`read()`	Read a byte of data from the file, blocking until data is available.
`int`	`read(byte[] b)`	Read up to `b.length( )` bytes into an array.
`int`	`read(byte[] b, int off, int len)`	Read up to `len` bytes into an array, at a specified offset.
`protected int`	`read_(long pos, byte[] b, int offset, int len)`	Read directly from file, without going through the buffer.
`boolean`	`readBoolean()`	Reads a `boolean` from this file.
`protected void`	`readBuffer(long pos)`
`byte`	`readByte()`	Reads a signed 8-bit value from this file.
`protected int`	`readBytes(byte[] b, int off, int len)`	Read up to `len` bytes into an array, at a specified offset.
`byte[]`	`readBytes(int count)`	Read fully count number of bytes
`char`	`readChar()`	Reads a Unicode character from this file.
`double`	`readDouble()`	Reads a `double` from this file.
`void`	`readDouble(double[] pa, int start, int n)`	Read an array of doubles
`float`	`readFloat()`	Reads a `float` from this file.
`void`	`readFloat(float[] pa, int start, int n)`	Read an array of floats
`void`	`readFully(byte[] b)`	Reads `b.length` bytes from this file into the byte array.
`void`	`readFully(byte[] b, int off, int len)`	Reads exactly `len` bytes from this file into the byte array.
`int`	`readInt()`	Reads a signed 32-bit integer from this file.
`void`	`readInt(int[] pa, int start, int n)`	Read an array of ints
`int`	`readIntUnbuffered(long pos)`	Read an integer at the given position, bypassing all buffering.
`String`	`readLine()`	Reads the next line of text from this file.
`long`	`readLong()`	Reads a signed 64-bit integer from this file.
`void`	`readLong(long[] pa, int start, int n)`	Read an array of longs
`short`	`readShort()`	Reads a signed 16-bit number from this file.
`void`	`readShort(short[] pa, int start, int n)`	Read an array of shorts
`String`	`readString(int nbytes)`	Read a String of knoen length.
`long`	`readToByteChannel(WritableByteChannel dest, long offset, long nbytes)`	Read `nbytes` bytes, at the specified file offset, send to a WritableByteChannel.
`int`	`readUnsignedByte()`	Reads an unsigned 8-bit number from this file.
`long`	`readUnsignedInt()`
`int`	`readUnsignedShort()`	Reads an unsigned 16-bit number from this file.
`String`	`readUTF()`	Reads in a string from this file.
`boolean`	`searchForward(KMPMatch match, int maxBytes)`	Search forward from the current pos, looking for a match.
`void`	`seek(long pos)`	Set the position in the file for the next read or write.
`void`	`setBufferSize(int bufferSize)`	Set the buffer size.
`static void`	`setDebugAccess(boolean b)`	Debugging, do not use.
`static void`	`setDebugLeaks(boolean b)`	Debugging, do not use.
`void`	`setExtendMode()`	Set extendMode for truncated, yet valid files - old NetCDF code allowed this when NOFILL on, and user doesnt write all variables.
`void`	`setMinLength(long minLength)`	Make sure file is at least this long when its closed.
`int`	`skipBytes(int n)`	Skips exactly `n` bytes of input.
`String`	`toString()`	Create a string representation of this object.
`void`	`unread()`	Unread the last byte read.
`void`	`write(byte[] b)`	Writes `b.length` bytes from the specified byte array starting at offset `off` to this file.
`void`	`write(byte[] b, int off, int len)`	Writes `len` bytes from the specified byte array starting at offset `off` to this file.
`void`	`write(int b)`	Write a byte to the file.
`void`	`writeBoolean(boolean v)`	Writes a `boolean` to the file as a 1-byte value.
`void`	`writeBoolean(boolean[] pa, int start, int n)`	Write an array of booleans
`void`	`writeByte(int v)`	Writes a `byte` to the file as a 1-byte value.
`void`	`writeBytes(byte[] b, int off, int len)`	Write `len` bytes from an array to the file.
`void`	`writeBytes(char[] b, int off, int len)`	Writes the character array to the file as a sequence of bytes.
`void`	`writeBytes(String s)`	Writes the string to the file as a sequence of bytes.
`void`	`writeChar(char[] pa, int start, int n)`	Write an array of chars
`void`	`writeChar(int v)`	Writes a `char` to the file as a 2-byte value, high byte first.
`void`	`writeChars(String s)`	Writes a string to the file as a sequence of characters.
`void`	`writeDouble(double v)`	Converts the double argument to a `long` using the `doubleToLongBits` method in class `Double`, and then writes that `long` value to the file as an 8-byte quantity, high byte first.
`void`	`writeDouble(double[] pa, int start, int n)`	Write an array of doubles
`void`	`writeFloat(float v)`	Converts the float argument to an `int` using the `floatToIntBits` method in class `Float`, and then writes that `int` value to the file as a 4-byte quantity, high byte first.
`void`	`writeFloat(float[] pa, int start, int n)`	Write an array of floats
`void`	`writeInt(int v)`	Writes an `int` to the file as four bytes, high byte first.
`void`	`writeInt(int[] pa, int start, int n)`	Write an array of ints
`void`	`writeLong(long v)`	Writes a `long` to the file as eight bytes, high byte first.
`void`	`writeLong(long[] pa, int start, int n)`	Write an array of longs
`void`	`writeShort(int v)`	Writes a `short` to the file as two bytes, high byte first.
`void`	`writeShort(short[] pa, int start, int n)`	Write an array of shorts
`void`	`writeUTF(String str)`	Writes a string to the file using UTF-8 encoding in a machine-independent manner.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - BIG_ENDIAN
```
public static final int BIG_ENDIAN
```
    另请参阅:
    
    常量字段值
  - LITTLE_ENDIAN
```
public static final int LITTLE_ENDIAN
```
    另请参阅:
    
    常量字段值
  - debugLeaks
```
protected static boolean debugLeaks
```
  - debugAccess
```
protected static boolean debugAccess
```
  - allFiles
```
protected static Set<String> allFiles
```
  - openFiles
```
protected static List<String> openFiles
```
  - showOpen
```
protected static boolean showOpen
```
  - showRead
```
protected static boolean showRead
```
  - defaultBufferSize
```
protected static final int defaultBufferSize
```
    The default buffer size, in bytes.
    
    另请参阅:
    
    常量字段值
  - location
```
protected String location
```
    File location
  - file
```
protected RandomAccessFile file
```
    The underlying java.io.RandomAccessFile.
  - fileChannel
```
protected FileChannel fileChannel
```
  - filePosition
```
protected long filePosition
```
    The offset in bytes from the file start, of the next read or write operation.
  - buffer
```
protected byte[] buffer
```
    The buffer used for reading the data.
  - bufferStart
```
protected long bufferStart
```
    The offset in bytes of the start of the buffer, from the start of the file.
  - dataEnd
```
protected long dataEnd
```
    The offset in bytes of the end of the data in the buffer, from the start of the file. This can be calculated from bufferStart + dataSize, but it is cached to speed up the read( ) method.
  - dataSize
```
protected int dataSize
```
    The size of the data stored in the buffer, in bytes. This may be less than the size of the buffer.
  - endOfFile
```
protected boolean endOfFile
```
    True if we are at the end of the file.
  - readonly
```
protected boolean readonly
```
    The access mode of the file.
  - bigEndian
```
protected boolean bigEndian
```
    The current endian (big or little) mode of the file.
- 构造器详细资料
  - RandomAccessFile
```
protected RandomAccessFile(int bufferSize)
```
    Constructor, for subclasses
    
    参数:
    
    bufferSize - size of read buffer
  - RandomAccessFile
```
public RandomAccessFile(String location,
                        String mode)
                 throws IOException
```
    Constructor, default buffer size.
    
    参数:
    
    location - location of the file
    
    mode - same as for java.io.RandomAccessFile
    
    抛出:
    
    IOException - on open error
  - RandomAccessFile
```
public RandomAccessFile(String location,
                        String mode,
                        int bufferSize)
                 throws IOException
```
    Constructor.
    
    参数:
    
    location - location of the file
    
    mode - same as for java.io.RandomAccessFile
    
    bufferSize - size of buffer to use.
    
    抛出:
    
    IOException - on open error
- 方法详细资料
  - getDebugLeaks
```
public static boolean getDebugLeaks()
```
    Debugging, do not use.
    
    返回:
    
    true if debugLeaks is on
  - setDebugLeaks
```
public static void setDebugLeaks(boolean b)
```
    Debugging, do not use.
    
    参数:
    
    b - set true to track java.io.RandomAccessFile
  - getOpenFiles
```
public static List<String> getOpenFiles()
```
    Debugging, do not use.
    
    返回:
    
    list of open files.
  - getAllFiles
```
public static List<String> getAllFiles()
```
  - setDebugAccess
```
public static void setDebugAccess(boolean b)
```
    Debugging, do not use.
    
    参数:
    
    b - to debug file reading
  - getDebugNseeks
```
public static int getDebugNseeks()
```
  - getDebugNbytes
```
public static long getDebugNbytes()
```
  - getRandomAccessFile
```
public RandomAccessFile getRandomAccessFile()
```
    Allow access to the underlying java.io.RandomAccessFile. WARNING! BROKEN ENCAPSOLATION, DO NOT USE. May change implementation in the future.
    
    返回:
    
    the underlying java.io.RandomAccessFile.
  - setBufferSize
```
public void setBufferSize(int bufferSize)
```
    Set the buffer size. If writing, call flush() first.
    
    参数:
    
    bufferSize - length in bytes
  - getBufferSize
```
public int getBufferSize()
```
    Get the buffer size
    
    返回:
    
    bufferSize length in bytes
  - close
```
public void close()
           throws IOException
```
    Close the file, and release any associated system resources.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - isAtEndOfFile
```
public boolean isAtEndOfFile()
```
    Return true if file pointer is at end of file.
    
    返回:
    
    true if file pointer is at end of file
  - seek
```
public void seek(long pos)
          throws IOException
```
    Set the position in the file for the next read or write.
    
    参数:
    
    pos - the offset (in bytes) from the start of the file.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - readBuffer
```
protected void readBuffer(long pos)
                   throws IOException
```
    抛出:
    
    IOException
  - getFilePointer
```
public long getFilePointer()
```
    Returns the current position in the file, where the next read or write will occur.
    
    返回:
    
    the offset from the start of the file in bytes.
  - getLocation
```
public String getLocation()
```
    Get the file location, or name.
    
    返回:
    
    file location
  - length
```
public long length()
            throws IOException
```
    Get the length of the file. The data in the buffer (which may not have been written the disk yet) is taken into account.
    
    返回:
    
    the length of the file in bytes.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - order
```
public void order(int endian)
```
    Change the current endian mode. Subsequent reads of short, int, float, double, long, char will use this. Does not currently affect writes. Default values is BIG_ENDIAN.
    
    参数:
    
    endian - RandomAccessFile.BIG_ENDIAN or RandomAccessFile.LITTLE_ENDIAN
  - getFD
```
public FileDescriptor getFD()
                     throws IOException
```
    Returns the opaque file descriptor object associated with this file.
    
    返回:
    
    the file descriptor object associated with this file.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - flush
```
public void flush()
           throws IOException
```
    Copy the contents of the buffer to the disk.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - setMinLength
```
public void setMinLength(long minLength)
```
    Make sure file is at least this long when its closed. needed when not using fill mode, and not all data is written.
    
    参数:
    
    minLength - minimum length of the file.
  - setExtendMode
```
public void setExtendMode()
```
    Set extendMode for truncated, yet valid files - old NetCDF code allowed this when NOFILL on, and user doesnt write all variables.
  - read
```
public int read()
         throws IOException
```
    Read a byte of data from the file, blocking until data is available.
    
    返回:
    
    the next byte of data, or -1 if the end of the file is reached.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - readBytes
```
protected int readBytes(byte[] b,
                        int off,
                        int len)
                 throws IOException
```
    Read up to len bytes into an array, at a specified offset. This will block until at least one byte has been read.
    
    参数:
    
    b - the byte array to receive the bytes.
    
    off - the offset in the array where copying will start.
    
    len - the number of bytes to copy.
    
    返回:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - readToByteChannel
```
public long readToByteChannel(WritableByteChannel dest,
                              long offset,
                              long nbytes)
                       throws IOException
```
    Read nbytes bytes, at the specified file offset, send to a WritableByteChannel. This will block until all bytes are read. This uses the underlying file channel directly, bypassing all user buffers.
    
    参数:
    
    dest - write to this WritableByteChannel.
    
    offset - the offset in the file where copying will start.
    
    nbytes - the number of bytes to read.
    
    返回:
    
    the actual number of bytes read and transfered
    
    抛出:
    
    IOException - if an I/O error occurs.
  - read_
```
protected int read_(long pos,
                    byte[] b,
                    int offset,
                    int len)
             throws IOException
```
    Read directly from file, without going through the buffer. All reading goes through here or readToByteChannel;
    
    参数:
    
    pos - start here in the file
    
    b - put data into this buffer
    
    offset - buffer offset
    
    len - this number of bytes
    
    返回:
    
    actual number of bytes read
    
    抛出:
    
    IOException - on io error
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws IOException
```
    Read up to len bytes into an array, at a specified offset. This will block until at least one byte has been read.
    
    参数:
    
    b - the byte array to receive the bytes.
    
    off - the offset in the array where copying will start.
    
    len - the number of bytes to copy.
    
    返回:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - read
```
public int read(byte[] b)
         throws IOException
```
    Read up to b.length( ) bytes into an array. This will block until at least one byte has been read.
    
    参数:
    
    b - the byte array to receive the bytes.
    
    返回:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - readBytes
```
public byte[] readBytes(int count)
                 throws IOException
```
    Read fully count number of bytes
    
    参数:
    
    count - how many bytes tp read
    
    返回:
    
    a byte array of length count, fully read in
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - readFully
```
public final void readFully(byte[] b)
                     throws IOException
```
    Reads b.length bytes from this file into the byte array. This method reads repeatedly from the file until all the bytes are read. This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readFully 在接口中 DataInput
    
    参数:
    
    b - the buffer into which the data is read.
    
    抛出:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
  - readFully
```
public final void readFully(byte[] b,
                            int off,
                            int len)
                     throws IOException
```
    Reads exactly len bytes from this file into the byte array. This method reads repeatedly from the file until all the bytes are read. This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readFully 在接口中 DataInput
    
    参数:
    
    b - the buffer into which the data is read.
    
    off - the start offset of the data.
    
    len - the number of bytes to read.
    
    抛出:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
  - skipBytes
```
public int skipBytes(int n)
              throws IOException
```
    Skips exactly n bytes of input. This method blocks until all the bytes are skipped, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    skipBytes 在接口中 DataInput
    
    参数:
    
    n - the number of bytes to be skipped.
    
    返回:
    
    the number of bytes skipped, which is always n.
    
    抛出:
    
    EOFException - if this file reaches the end before skipping all the bytes.
    
    IOException - if an I/O error occurs.
  - unread
```
public void unread()
```
    Unread the last byte read. This method should not be used more than once between reading operations, or strange things might happen.
  - write
```
public void write(int b)
           throws IOException
```
    Write a byte to the file. If the file has not been opened for writing, an IOException will be raised only when an attempt is made to write the buffer to the file.
    Caveat: the effects of seek( )ing beyond the end of the file are undefined.
    
    指定者:
    
    write 在接口中 DataOutput
    
    参数:
    
    b - write this byte
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - writeBytes
```
public void writeBytes(byte[] b,
                       int off,
                       int len)
                throws IOException
```
    Write len bytes from an array to the file.
    
    参数:
    
    b - the array containing the data.
    
    off - the offset in the array to the data.
    
    len - the length of the data.
    
    抛出:
    
    IOException - if an I/O error occurrs.
  - write
```
public void write(byte[] b)
           throws IOException
```
    Writes b.length bytes from the specified byte array starting at offset off to this file.
    
    指定者:
    
    write 在接口中 DataOutput
    
    参数:
    
    b - the data.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - write
```
public void write(byte[] b,
                  int off,
                  int len)
           throws IOException
```
    Writes len bytes from the specified byte array starting at offset off to this file.
    
    指定者:
    
    write 在接口中 DataOutput
    
    参数:
    
    b - the data.
    
    off - the start offset in the data.
    
    len - the number of bytes to write.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - readBoolean
```
public final boolean readBoolean()
                          throws IOException
```
    Reads a boolean from this file. This method reads a single byte from the file. A value of 0 represents false. Any other value represents true. This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readBoolean 在接口中 DataInput
    
    返回:
    
    the boolean value read.
    
    抛出:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readByte
```
public final byte readByte()
                    throws IOException
```
    Reads a signed 8-bit value from this file. This method reads a byte from the file. If the byte read is b, where 0 <= b <= 255, then the result is:
    (byte)(b)
    
    This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readByte 在接口中 DataInput
    
    返回:
    
    the next byte of this file as a signed 8-bit byte.
    
    抛出:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readUnsignedByte
```
public final int readUnsignedByte()
                           throws IOException
```
    Reads an unsigned 8-bit number from this file. This method reads a byte from this file and returns that byte.
    This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readUnsignedByte 在接口中 DataInput
    
    返回:
    
    the next byte of this file, interpreted as an unsigned 8-bit number.
    
    抛出:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readShort
```
public final short readShort()
                      throws IOException
```
    Reads a signed 16-bit number from this file. The method reads 2 bytes from this file. If the two bytes read, in order, are b1 and b2, where each of the two values is between 0 and 255, inclusive, then the result is equal to:
    (short)((b1 << 8) | b2)
    
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readShort 在接口中 DataInput
    
    返回:
    
    the next two bytes of this file, interpreted as a signed 16-bit number.
    
    抛出:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readShort
```
public final void readShort(short[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Read an array of shorts
    
    参数:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    抛出:
    
    IOException - on read error
  - readUnsignedShort
```
public final int readUnsignedShort()
                            throws IOException
```
    Reads an unsigned 16-bit number from this file. This method reads two bytes from the file. If the bytes read, in order, are b1 and b2, where 0 <= b1, b2 <= 255, then the result is equal to:
    (b1 << 8) | b2
    
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readUnsignedShort 在接口中 DataInput
    
    返回:
    
    the next two bytes of this file, interpreted as an unsigned 16-bit integer.
    
    抛出:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readUnsignedInt
```
public final long readUnsignedInt()
                           throws IOException
```
    抛出:
    
    IOException
  - readChar
```
public final char readChar()
                    throws IOException
```
    Reads a Unicode character from this file. This method reads two bytes from the file. If the bytes read, in order, are b1 and b2, where 0 <= b1, b2 <= 255, then the result is equal to:
    (char)((b1 << 8) | b2)
    
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readChar 在接口中 DataInput
    
    返回:
    
    the next two bytes of this file as a Unicode character.
    
    抛出:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readInt
```
public final int readInt()
                  throws IOException
```
    Reads a signed 32-bit integer from this file. This method reads 4 bytes from the file. If the bytes read, in order, are b1, b2, b3, and b4, where 0 <= b1, b2, b3, b4 <= 255, then the result is equal to:
    (b1 << 24) | (b2 << 16) + (b3 << 8) + b4
    
    This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readInt 在接口中 DataInput
    
    返回:
    
    the next four bytes of this file, interpreted as an int.
    
    抛出:
    
    EOFException - if this file reaches the end before reading four bytes.
    
    IOException - if an I/O error occurs.
  - readIntUnbuffered
```
public final int readIntUnbuffered(long pos)
                            throws IOException
```
    Read an integer at the given position, bypassing all buffering.
    
    参数:
    
    pos - read a byte at this position
    
    返回:
    
    The int that was read
    
    抛出:
    
    IOException - if an I/O error occurs.
  - readInt
```
public final void readInt(int[] pa,
                          int start,
                          int n)
                   throws IOException
```
    Read an array of ints
    
    参数:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    抛出:
    
    IOException - on read error
  - readLong
```
public final long readLong()
                    throws IOException
```
    Reads a signed 64-bit integer from this file. This method reads eight bytes from the file. If the bytes read, in order, are b1, b2, b3, b4, b5, b6, b7, and b8, where:
    0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255,
    
    then the result is equal to:
    ((long)b1 << 56) + ((long)b2 << 48) + ((long)b3 << 40) + ((long)b4 << 32) + ((long)b5 << 24) + ((long)b6 << 16) + ((long)b7 << 8) + b8
    
    This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
    指定者:
    
    readLong 在接口中 DataInput
    
    返回:
    
    the next eight bytes of this file, interpreted as a long.
    
    抛出:
    
    EOFException - if this file reaches the end before reading eight bytes.
    
    IOException - if an I/O error occurs.
  - readLong
```
public final void readLong(long[] pa,
                           int start,
                           int n)
                    throws IOException
```
    Read an array of longs
    
    参数:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    抛出:
    
    IOException - on read error
  - readFloat
```
public final float readFloat()
                      throws IOException
```
    Reads a float from this file. This method reads an int value as if by the readInt method and then converts that int to a float using the intBitsToFloat method in class Float.
    This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readFloat 在接口中 DataInput
    
    返回:
    
    the next four bytes of this file, interpreted as a float.
    
    抛出:
    
    EOFException - if this file reaches the end before reading four bytes.
    
    IOException - if an I/O error occurs.
    
    另请参阅:
    
    RandomAccessFile.readInt(), Float.intBitsToFloat(int)
  - readFloat
```
public final void readFloat(float[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Read an array of floats
    
    参数:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    抛出:
    
    IOException - on read error
  - readDouble
```
public final double readDouble()
                        throws IOException
```
    Reads a double from this file. This method reads a long value as if by the readLong method and then converts that long to a double using the longBitsToDouble method in class Double.
    This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readDouble 在接口中 DataInput
    
    返回:
    
    the next eight bytes of this file, interpreted as a double.
    
    抛出:
    
    EOFException - if this file reaches the end before reading eight bytes.
    
    IOException - if an I/O error occurs.
    
    另请参阅:
    
    RandomAccessFile.readLong(), Double.longBitsToDouble(long)
  - readDouble
```
public final void readDouble(double[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Read an array of doubles
    
    参数:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    抛出:
    
    IOException - on read error
  - readLine
```
public final String readLine()
                      throws IOException
```
    Reads the next line of text from this file. This method successively reads bytes from the file until it reaches the end of a line of text.
    
    A line of text is terminated by a carriage-return character ('\r'), a newline character ('\n'), a carriage-return character immediately followed by a newline character, or the end of the input stream. The line-terminating character(s), if any, are included as part of the string returned.
    
    This method blocks until a newline character is read, a carriage return and the byte following it are read (to see if it is a newline), the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readLine 在接口中 DataInput
    
    返回:
    
    the next line of text from this file.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - readUTF
```
public final String readUTF()
                     throws IOException
```
    Reads in a string from this file. The string has been encoded using a modified UTF-8 format.
    The first two bytes are read as if by readUnsignedShort. This value gives the number of following bytes that are in the encoded string, not the length of the resulting string. The following bytes are then interpreted as bytes encoding characters in the UTF-8 format and are converted into characters.
    This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    指定者:
    
    readUTF 在接口中 DataInput
    
    返回:
    
    a Unicode string.
    
    抛出:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
    
    UTFDataFormatException - if the bytes do not represent valid UTF-8 encoding of a Unicode string.
    
    另请参阅:
    
    RandomAccessFile.readUnsignedShort()
  - readString
```
public String readString(int nbytes)
                  throws IOException
```
    Read a String of knoen length.
    
    参数:
    
    nbytes - number of bytes to read
    
    返回:
    
    String wrapping the bytes.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeBoolean
```
public final void writeBoolean(boolean v)
                        throws IOException
```
    Writes a boolean to the file as a 1-byte value. The value true is written out as the value (byte)1; the value false is written out as the value (byte)0.
    
    指定者:
    
    writeBoolean 在接口中 DataOutput
    
    参数:
    
    v - a boolean value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeBoolean
```
public final void writeBoolean(boolean[] pa,
                               int start,
                               int n)
                        throws IOException
```
    Write an array of booleans
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    抛出:
    
    IOException - on read error
  - writeByte
```
public final void writeByte(int v)
                     throws IOException
```
    Writes a byte to the file as a 1-byte value.
    
    指定者:
    
    writeByte 在接口中 DataOutput
    
    参数:
    
    v - a byte value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeShort
```
public final void writeShort(int v)
                      throws IOException
```
    Writes a short to the file as two bytes, high byte first.
    
    指定者:
    
    writeShort 在接口中 DataOutput
    
    参数:
    
    v - a short to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeShort
```
public final void writeShort(short[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Write an array of shorts
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - this number of elements
    
    抛出:
    
    IOException - on read error
  - writeChar
```
public final void writeChar(int v)
                     throws IOException
```
    Writes a char to the file as a 2-byte value, high byte first.
    
    指定者:
    
    writeChar 在接口中 DataOutput
    
    参数:
    
    v - a char value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeChar
```
public final void writeChar(char[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Write an array of chars
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - this number of elements
    
    抛出:
    
    IOException - on read error
  - writeInt
```
public final void writeInt(int v)
                    throws IOException
```
    Writes an int to the file as four bytes, high byte first.
    
    指定者:
    
    writeInt 在接口中 DataOutput
    
    参数:
    
    v - an int to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeInt
```
public final void writeInt(int[] pa,
                           int start,
                           int n)
                    throws IOException
```
    Write an array of ints
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    抛出:
    
    IOException - on read error
  - writeLong
```
public final void writeLong(long v)
                     throws IOException
```
    Writes a long to the file as eight bytes, high byte first.
    
    指定者:
    
    writeLong 在接口中 DataOutput
    
    参数:
    
    v - a long to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeLong
```
public final void writeLong(long[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Write an array of longs
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    抛出:
    
    IOException - on read error
  - writeFloat
```
public final void writeFloat(float v)
                      throws IOException
```
    Converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the file as a 4-byte quantity, high byte first.
    
    指定者:
    
    writeFloat 在接口中 DataOutput
    
    参数:
    
    v - a float value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
    
    另请参阅:
    
    Float.floatToIntBits(float)
  - writeFloat
```
public final void writeFloat(float[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Write an array of floats
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    抛出:
    
    IOException - on read error
  - writeDouble
```
public final void writeDouble(double v)
                       throws IOException
```
    Converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the file as an 8-byte quantity, high byte first.
    
    指定者:
    
    writeDouble 在接口中 DataOutput
    
    参数:
    
    v - a double value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
    
    另请参阅:
    
    Double.doubleToLongBits(double)
  - writeDouble
```
public final void writeDouble(double[] pa,
                              int start,
                              int n)
                       throws IOException
```
    Write an array of doubles
    
    参数:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    抛出:
    
    IOException - on read error
  - writeBytes
```
public final void writeBytes(String s)
                      throws IOException
```
    Writes the string to the file as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits.
    
    指定者:
    
    writeBytes 在接口中 DataOutput
    
    参数:
    
    s - a string of bytes to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeBytes
```
public final void writeBytes(char[] b,
                             int off,
                             int len)
                      throws IOException
```
    Writes the character array to the file as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits.
    
    参数:
    
    b - a character array of bytes to be written.
    
    off - the index of the first character to write.
    
    len - the number of characters to write.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - writeChars
```
public final void writeChars(String s)
                      throws IOException
```
    Writes a string to the file as a sequence of characters. Each character is written to the data output stream as if by the writeChar method.
    
    指定者:
    
    writeChars 在接口中 DataOutput
    
    参数:
    
    s - a String value to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
    
    另请参阅:
    
    RandomAccessFile.writeChar(int)
  - writeUTF
```
public final void writeUTF(String str)
                    throws IOException
```
    Writes a string to the file using UTF-8 encoding in a machine-independent manner.
    First, two bytes are written to the file as if by the writeShort method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string. Following the length, each character of the string is output, in sequence, using the UTF-8 encoding for each character.
    
    指定者:
    
    writeUTF 在接口中 DataOutput
    
    参数:
    
    str - a string to be written.
    
    抛出:
    
    IOException - if an I/O error occurs.
  - toString
```
public String toString()
```
    Create a string representation of this object.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a string representation of the state of the object.
  - searchForward
```
public boolean searchForward(KMPMatch match,
                             int maxBytes)
                      throws IOException
```
    Search forward from the current pos, looking for a match.
    
    参数:
    
    match - the match youre looking for.
    
    maxBytes - maximum number of bytes to search. use -1 for all
    
    返回:
    
    true if found, file position will be at the start of the match.
    
    抛出:
    
    IOException - on read error

类 RandomAccessFile

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

BIG_ENDIAN

LITTLE_ENDIAN

debugLeaks

debugAccess

allFiles

openFiles

showOpen

showRead

defaultBufferSize

location

file

fileChannel

filePosition

buffer

bufferStart

dataEnd

dataSize

endOfFile

readonly

bigEndian

构造器详细资料

RandomAccessFile

RandomAccessFile

RandomAccessFile

方法详细资料

getDebugLeaks

setDebugLeaks

getOpenFiles

getAllFiles

setDebugAccess

getDebugNseeks

getDebugNbytes

getRandomAccessFile

setBufferSize

getBufferSize

close

isAtEndOfFile

seek

readBuffer

getFilePointer

getLocation

length

order

getFD

flush

setMinLength

setExtendMode

read

readBytes

readToByteChannel

read_

read

read

readBytes

readFully

readFully

skipBytes

unread

write

writeBytes

write

write

readBoolean

readByte

readUnsignedByte

readShort

readShort

readUnsignedShort

readUnsignedInt

readChar

readInt

readIntUnbuffered

readInt

readLong