java - How to read a DataInputStream twice or more than twice? -

i have socket connection application hosted elsewhere. once connected made outputstream , datainputstream.

once connection has been made, use outputstream send out handshake packet application. once handshake has been approved, returns packet through datainputstream (1).

this packet processed , returned application outputstream.

if returned data valid, packet datainputstream (2). however, have not been able read packet through datainputstream.

i have tried use datainputstream.marksupported() , datainputstream.mark() gave me nothing (except empty exception message).

is possible read input stream second time? , if so, can please point me out i'm doing wrong here?

edit: here solution:

// first define output , input streams. outputstream output = socket.getoutputstream(); bufferedinputstream bis = new bufferedinputstream(socket.getinputstream());  // send first packet application. output.write("test"); // (not actual data sent)  // make empty byte array , fill first response application. byte[] incoming = new byte[200]; bis.read(incoming); //first packet receive  //send second packet application. output.write("test2"); // (not actual data sent)  // mark input stream length of first response , reset stream. bis.mark(incoming.length); bis.reset();  // create second empty byte array , fill second response application. byte[] incoming2 = new byte[200]; bis.read(incoming2); 

i'm not sure if correct way this, way worked me.

i use bytearrayinput stream or can reset. involve reading data type of input stream , creating one.

inputstream has marksupported() method check on original , byte array 1 find 1 mark work with:

https://docs.oracle.com/javase/7/docs/api/java/io/inputstream.html#marksupported() https://docs.oracle.com/javase/7/docs/api/java/io/bytearrayinputstream.html