Java TCP/IP Socket Programming (2nd Edition)

This book is the Chinese translation of the second edition of TCP/IP Sockets in Java: Practical Guide for Programmers, aimed at Java developers who need to write network communication programs hands-on. Guided by the principle of "concise theory, code speaks," the book is organized around how TCP/IP sockets are implemented in Java: it first introduces basic concepts such as networks, packets, protocols, addresses and names, and the client/server model, then explains the nature of sockets; it then demonstrates how to write TCP clients, TCP servers, and UDP datagrams, along with how to organize input/output streams. At the data level, the book discusses the encoding of integers, strings, and booleans, framing and parsing, and the construction and parsing of text-based and binary protocol messages, helping readers write messages that different systems can correctly interpret. Advanced sections cover multithreaded servers, one thread per client, thread pools and the Executor framework, blocking and timeout control, broadcast and multicast, Keep-Alive, buffer size, address reuse, lingering after close, and other socket options, as well as connection closing and lifecycle issues. Chapter 5 is devoted to NIO's Channel, Buffer, and Selector, while Chapter 6 analyzes underlying mechanisms in depth from the perspectives of buffering, deadlock risk, and performance. The book is compact, with downloadable sample source code and exercises at the end of each chapter; it is suitable as supplementary reading for university network programming courses and for engineers who want to get up to speed quickly on real projects.