Best way to read binary data?

[uddipan@xxxxxxxxxxxxxxxx (Uddipan Bagchi)]

> I will need to convert the bytes in that input stream into native Java types
> like long and int.

DataInputStream and ObjectInputStream provide methods that do just this.

> Ideally, I'd like to create objects from parts of the
> data.  E.g., I might want to convert 20 bytes comprising an IP header into
> an IP object.

If you put an Object (understood as being distinct from just a stream of bytes)
into the a byte stream using writeObject(Object) method of ObjectOutputStream,
then you can read it back using readObject() method of ObjectInputStream. If it
hasn't been written using writeObject(Object), and instead is written as a
sequence of bytes reflecting some state of the object, then you would have to
construct a new object after gathering the state of the object with consecutive
reads using the readXXX() methods of ObjectInputStream.

HIH.

- Uddipan.


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