This module shows how to communicate using TCP and UDP sockets.

1. Streams

This part covers stream handling using the Java IO API.

The programming examples can be found in GitHub, https://github.com/KTH-ID1212/streams

2. Sockets

This part covers TCP and UDP sockets using the package java.net.

The programming examples can be found in GitHub, https://github.com/KTH-ID1212/sockets

Introduction to socket communicationThis is the presentation used in the video, sockets.pdf.
A small UDP example, UDP streaming programThe example above illustrates the following.
- How to use UDP sockets
- Server-side thread handling
- Coding best practices
A small TCP example, an HTTP client and an HTTP serverThe examples above illustrate the following.
- How to use TCP sockets for the HTTP protocol
- The need of a length header
- The need to call flush() when sending data through a stream
- Server-side thread handling
- Coding best practices
A bigger example, chat program
- Architecture and communication protocol in the chat program
- Running the chat program
- Chat client code
- Chat server code
- Using serialized objects instead of a text-based protocol
The chat program example above illustrates the following.
- A layered architecture
- Design and coding best practices
- The observer design pattern
- Client-side thread handling and server-side thread handling
- TCP communication with blocking sockets
- A custom communication protocol, both a text-based protocol and a protocol using serialized objects are demonstrated
- How to use the ForkJoinPool thread pool, which is built-in in the JDK
- How to use the debugger