Java TCP。 如何确认收到的数据包是一个完整的数据结构？

Question

I currently have a program that listens and sends on a TCP socket.

The problem I'm having is that I send a packet and sometimes it breaks into pieces. So my listening TCP socket class thinks the first piece that comes in is the entire payload.

What is the typical approach people take when programming with TCP connections?

Answer 1

You cannot assume that the first piece is the entire payload. You have to keep reading off the socket until you get all of it.

There are two options:

Option 1
Mark the end of your messages (data structures). Your listener then keeps reading until it gets the end-of-message marker.

Option 2
Send the length of you message or data structure before you send the actual data. Your listener then keeps reading until its read all the bytes.