Bytebuffer and UTF

[jespersahner]

In Java IO the DataInputStream-class supports readInt()-,
readDouble()- og especially readUTF(). In Java NIO the ByteBuffer-class
has the same functionality through getInt(), getDouble() - but getUTF()
doesn't exist.

How is UTF read with Java NIO?

You can probably make a workaround by copying the source from
readUFT() in the DataInputStream-class, by I wonder why there isn't a
getUTF()-method in the ByteBuffer-class.

Am I missing something?

 

[Thomas Hawtin]

How is UTF read with Java NIO?

You can probably make a workaround by copying the source from
readUFT() in the DataInputStream-class, by I wonder why there isn't a
getUTF()-method in the ByteBuffer-class.

Am I missing something?

java.nio.charsets?

Tom Hawtin

 

[jespersahner]

Could you be more specific? The "trick" about writeUTF() and readUTF()
is that the length of the string is "included" in the format.

Regards,
Jesper

 

[Dale King]

Could you be more specific? The "trick" about writeUTF() and readUTF()
is that the length of the string is "included" in the format.

That format is specific to writeUTF and readUTF. Basically you need to
do the length yourself and then you can convert between char and byte
using the encode and decode methods of Charset.

If you need to actually emulate the length property of readUTF/writeUTF
then you have a little more work to do.

 

[Roedy Green]

That format is specific to writeUTF and readUTF. Basically you need to
do the length yourself and then you can convert between char and byte
using the encode and decode methods of Charset.

writeUTF prepends a length byte and readUTF expect one. These are for
embedding strings in DataOutput binary.


If you are reading UTF text files, then you just select the
appropriate encoding e.g. UTF-8 and the Reader/Writer deals with the
8-16 bit transformations.

see http://mindprod.com/applets/fileio.html
for sample code to do things both ways.