Class java.io.ByteArrayOutputStream - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.io.ByteArrayOutputStream

java.lang.Object
   |
   +----java.io.OutputStream
           |
           +----java.io.ByteArrayOutputStream

public class ByteArrayOutputStream
extends OutputStream

This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it. The data can be retrieved using toByteArray() and toString().

buf: The buffer where data is stored.
count: The number of valid bytes in the buffer.

ByteArrayOutputStream(): Creates a new byte array output stream.
ByteArrayOutputStream(int): Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

reset(): Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the ouput stream is discarded.
size(): Returns the current size of the buffer.
toByteArray(): Creates a newly allocated byte array.
toString(): Converts the buffer's contents into a string, translating bytes into characters according to the platform's default character encoding.
toString(int): Creates a newly allocated string. Deprecated.
toString(String): Converts the buffer's contents into a string, translating bytes into characters according to the specified character encoding.
write(byte[], int, int): Writes len bytes from the specified byte array starting at offset off to this byte array output stream.
write(int): Writes the specified byte to this byte array output stream.
writeTo(OutputStream): Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).

buf

 protected byte buf[]

The buffer where data is stored.

count

 protected int count

The number of valid bytes in the buffer.

ByteArrayOutputStream

 public ByteArrayOutputStream()

Creates a new byte array output stream. The buffer capacity is initially 32 bytes, though its size increases if necessary.

ByteArrayOutputStream

 public ByteArrayOutputStream(int size)

Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Parameters:: size - the initial size.

write

 public synchronized void write(int b)

Writes the specified byte to this byte array output stream.

Parameters:: b - the byte to be written.
Overrides:: write in class OutputStream

write

 public synchronized void write(byte b[],
                                int off,
                                int len)

Writes len bytes from the specified byte array starting at offset off to this byte array output stream.

Parameters:: b - the data.; off - the start offset in the data.; len - the number of bytes to write.
Overrides:: write in class OutputStream

writeTo

 public synchronized void writeTo(OutputStream out) throws IOException

Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).

Parameters:: out - the output stream to which to write the data.
Throws: IOException: if an I/O error occurs.

reset

 public synchronized void reset()

Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the ouput stream is discarded. The output stream can be used again, reusing the already allocated buffer space.

See Also:: count

toByteArray

 public synchronized byte[] toByteArray()

Creates a newly allocated byte array. Its size is the current size of this output stream and the valid contents of the buffer have been copied into it.

Returns:: the current contents of this output stream, as a byte array.
See Also:: size

size

 public int size()

Returns the current size of the buffer.

Returns:: the value of the count field, which is the number of valid bytes in this output stream.
See Also:: count

toString

 public String toString()

Converts the buffer's contents into a string, translating bytes into characters according to the platform's default character encoding.

Overrides:: toString in class Object

toString

 public String toString(String enc) throws UnsupportedEncodingException

Converts the buffer's contents into a string, translating bytes into characters according to the specified character encoding.

Parameters:: enc - a character-encoding name.

toString

 public String toString(int hibyte)

Note: toString() is deprecated. This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the toString(String enc) method, which takes an encoding-name argument, or the toString() method, which uses the platform's default character encoding.

Creates a newly allocated string. Its size is the current size of the output stream and the valid contents of the buffer have been copied into it. Each character c in the resulting string is constructed from the corresponding element b in the byte array such that:


     c == (char)(((hibyte & 0xff) << 8) | (b & 0xff))

Parameters:: hibyte - the high byte of each resulting Unicode character.
Returns:: the current contents of the output stream, as a string.
See Also:: size, toString, toString

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