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java.io
Class ByteArrayOutputStream
java.lang.Object
java.io.OutputStream
java.io.ByteArrayOutputStream
-
All Implemented Interfaces:
-
Closeable
,
Flushable
-
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().
Closing a
ByteArrayOutputStream
has no effect. The methods in this class can be called after the stream has been closed without generating an
IOException
.
-
Since:
-
JDK1.0
Field Summary
|
protected byte[] |
buf
The buffer where data is stored. |
protected int |
count
The number of valid bytes in the buffer. |
Constructor Summary
|
ByteArrayOutputStream
()
Creates a new byte array output stream. |
ByteArrayOutputStream
(int size)
Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes. |
Method Summary
|
void |
close
()
Closing a
ByteArrayOutputStream
has no effect. |
void |
reset
()
Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded. |
int |
size
()
Returns the current size of the buffer. |
byte[] |
toByteArray
()
Creates a newly allocated byte array. |
String
|
toString
()
Converts the buffer's contents into a
string decoding
string, translating
bytes
using
into characters according to
the platform's default character
set.
encoding.
|
String
|
toString
(int hibyte)
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.
|
String
|
toString
(
String
Converts the buffer's contents into a
string by decoding the
string, translating
bytes
using
into characters according to
the specified
charsetName
character encoding.
|
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. |
void |
write
(int b)
Writes the specified byte to this byte array output stream. |
void |
writeTo
(
OutputStream
out)
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.
-
Throws:
-
IllegalArgumentException
- if size is negative.
write
public void write(int b)
-
Writes the specified byte to this byte array output stream.
-
-
Specified by:
-
write
in class
OutputStream
-
-
Parameters:
-
b - the byte to be written.
write
public 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.
-
-
Overrides:
-
write
in class
OutputStream
-
-
Parameters:
-
b - the data.
-
off - the start offset in the data.
-
len - the number of bytes to write.
writeTo
public 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 void reset()
-
Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded. The output stream can be used again, reusing the already allocated buffer space.
-
-
See Also:
-
ByteArrayInputStream.count
toByteArray
public 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 decoding bytes using the platform's default character set. The length of the new
String
is a function of the character set, and hence may not be equal to the size of the buffer.
Converts the buffer's contents into a string, translating bytes into characters according to the platform's default character encoding.
This method always replaces malformed-input and unmappable-character sequences with the default replacement string for the platform's default character set. The
CharsetDecoder
class should be used when more control over the decoding process is required.
-
-
Overrides:
-
toString
in class
Object
-
-
Returns:
-
String
decoded
translated
from the buffer's contents. -
Since:
-
JDK1.1
toString
public StringtoString(String charsetName)
enc)
throws UnsupportedEncodingException
-
Converts the buffer's contents into a string by decoding the bytes using the specified
charsetName
. The length of the new
String
is a function of the charset, and hence may not be equal to the length of the byte array.
Converts the buffer's contents into a string, translating bytes into characters according to the specified character encoding.
This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement string. The
CharsetDecoder
class should be used when more control over the decoding process is required.
-
-
Parameters:
-
charsetName - the name of a supported
charset
enc - a character-encoding name.
-
Returns:
-
String
decoded
translated
from the buffer's contents. -
Throws:
-
UnsupportedEncodingException
- If the named
charset
encoding
is not
supported
supported.
-
Since:
-
JDK1.1
toString
@Deprecated
public String toString(int hibyte)
-
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(String)
,
toString()
close
public void close()
throws IOException
-
Closing a
ByteArrayOutputStream
has no effect. The methods in this class can be called after the stream has been closed without generating an
IOException
.
-
-
Specified by:
-
close
in interface
Closeable
-
Overrides:
-
close
in class
OutputStream
-
-
Throws:
-
IOException
- if an I/O error occurs.