Class ByteArrayOutputStream

java.lang.Object

java.io.OutputStream

org.apache.tomcat.util.http.fileupload.ByteArrayOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

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.

This is an alternative implementation of the ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 1024 bytes. In contrast to the original it doesn't reallocate the whole memory block but allocates additional buffers. This way no buffers need to be garbage collected and the contents don't have to be copied to the new buffer. This class is designed to behave exactly like the original. The only exception is the deprecated toString(int) method that has been ignored.

Constructor Summary

Constructors

Constructor	Description
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

Modifier and Type	Method	Description
void	close()	Closing a ByteArrayOutputStream has no effect.
byte[]	toByteArray()	Gets the current contents of this byte stream as a byte array.
void	write(byte[] b, int off, int len)	Write the bytes to byte array.
void	write(int b)	Write a byte to byte array.
void	writeTo(OutputStream out)	Writes the entire contents of this byte stream to the specified output stream.

Methods inherited from class java.io.OutputStream

flush, nullOutputStream, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ByteArrayOutputStream

public ByteArrayOutputStream()

Creates a new byte array output stream. The buffer capacity is initially 1024 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

Method Details

write

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

Write the bytes to byte array.

Overrides:

write in class OutputStream

Parameters:

b - the bytes to write

off - The start offset

len - The number of bytes to write

write

public void write(int b)

Write a byte to byte array.

Specified by:

write in class OutputStream

Parameters:

b - the byte to write

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 AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException - never (this method should not declare this exception but it has to now due to backwards compatibility)

writeTo

public void writeTo(OutputStream out)
             throws IOException

Writes the entire contents of this byte stream to the specified output stream.

Parameters:

out - the output stream to write to

Throws:

IOException - if an I/O error occurs, such as if the stream is closed

See Also:

• ByteArrayOutputStream.writeTo(OutputStream)

toByteArray

public byte[] toByteArray()

Gets the current contents of this byte stream as a byte array. The result is independent of this stream.

Returns:

the current contents of this output stream, as a byte array

See Also:

• ByteArrayOutputStream.toByteArray()