Closeable
, Flushable
, AutoCloseable
public class DigestOutputStream extends FilterOutputStream
To complete the message digest computation, call one of the digest
methods on the associated message digest after your calls to one of this digest output stream's write
methods.
It is possible to turn this stream on or off (see on
). When it is on, a call to one of the write
methods results in an update on the message digest. But when it is off, the message digest is not updated. The default is for the stream to be on.
Modifier and Type | Field | Description |
---|---|---|
protected MessageDigest |
digest |
The message digest associated with this stream. |
out
Constructor | Description |
---|---|
DigestOutputStream |
Creates a digest output stream, using the specified output stream and message digest. |
Modifier and Type | Method | Description |
---|---|---|
MessageDigest |
getMessageDigest() |
Returns the message digest associated with this stream. |
void |
on |
Turns the digest function on or off. |
void |
setMessageDigest |
Associates the specified message digest with this stream. |
String |
toString() |
Prints a string representation of this digest output stream and its associated message digest object. |
void |
write |
Updates the message digest (if the digest function is on) using the specified subarray, and in any case writes the subarray to the output stream. |
void |
write |
Updates the message digest (if the digest function is on) using the specified byte, and in any case writes the byte to the output stream. |
close, flush, write
nullOutputStream
protected MessageDigest digest
public DigestOutputStream(OutputStream stream, MessageDigest digest)
stream
- the output stream.digest
- the message digest to associate with this stream.public MessageDigest getMessageDigest()
public void setMessageDigest(MessageDigest digest)
digest
- the message digest to be associated with this stream.public void write(int b) throws IOException
on
), this method calls update
on the message digest associated with this stream, passing it the byte b
. This method then writes the byte to the output stream, blocking until the byte is actually written.write
in class FilterOutputStream
b
- the byte to be used for updating and writing to the output stream.IOException
- if an I/O error occurs.public void write(byte[] b, int off, int len) throws IOException
on
), this method calls update
on the message digest associated with this stream, passing it the subarray specifications. This method then writes the subarray bytes to the output stream, blocking until the bytes are actually written.write
in class FilterOutputStream
b
- the array containing the subarray to be used for updating and writing to the output stream.off
- the offset into b
of the first byte to be updated and written.len
- the number of bytes of data to be updated and written from b
, starting at offset off
.IOException
- if an I/O error occurs.public void on(boolean on)
write
methods results in an update on the message digest. But when it is off, the message digest is not updated.on
- true
to turn the digest function on, false
to turn it off.public String toString()
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/DigestOutputStream.html