Java TCP How do you read a sent stream size (header) and keep reading based upon that size

问题

Given the following pseudo code. how would I do read in the given data

回答1:

Use DataInputStream to make your life easy.

DataInputStream in = new DataInputStream(socket.getInputStream());
short myShortStreamSize = in.readShort();
byte[] payload = new byte[myShortStreamSize];
in.readFully(payload);

回答2:

Socket has a getInputStream() method. You would use the returned InputStream and read myShortStreamSize of bytes from it into a byte[], convert that into a int/long representing your payload size and then read into another, larger, new byte[payloadSize], the payload itself.

回答3:

You can try JBBP

@Bin class Struct { byte [] payload; }
@Bin class ParsedStream { Struct [] structs; }
ParsedStream parsed = JBBPParser.prepare("structs[_] { ushort size; byte [size] payload; }").parse(theInStream).mapTo(ParsedStream.class);

来源：https://stackoverflow.com/questions/14776930/java-tcp-how-do-you-read-a-sent-stream-size-header-and-keep-reading-based-upon