Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.
This article explains the high‑severity remote code execution and data‑theft flaw discovered in Apifox, outlines how malicious scripts can steal SSH keys, Git credentials and shell history, and provides step‑by‑step Mac and Windows commands for self‑inspection and comprehensive remediation.
This article analyzes the evolution of AI agents, compares multi‑agent and single‑agent frameworks, introduces the concept of an AI Tool Platform, and presents a five‑layer enterprise AI architecture with a step‑by‑step Java implementation roadmap for real‑world automation.
This article explains how to design scalable, collision‑free coupon codes by using a custom binary layout, bit‑field allocation, checksum validation, obfuscation, Base62 encoding, and provides complete Java‑style algorithms and database schema for production use.
This article traces the evolution of computers from philosophical logic to modern digital circuits, explains how logical gates enable computation, introduces bitwise operators with practical code examples, and analyzes a coupon‑code generation algorithm that combines masking, shifting, and XOR operations for secure identifier creation.
This article explains how to build a production‑grade short‑link service, covering the background of SMS short URLs, Base62 encoding principles, database schema design, request routing, security measures such as custom alphabets, rate limiting, and signed links, and additional management features for operation and monitoring.
This article explains common pitfalls when handling file uploads in Spring Boot, including temporary file lifecycle causing FileNotFound errors in asynchronous processing, and character encoding mismatches that lead to garbled text, and provides practical solutions such as size limits, main‑thread parsing, and BOM‑based charset detection.
This article concludes the "From Zero Hand‑write Mini Netty" series, walking through the evolution from a simple single‑thread NIO program to a multi‑threaded, pluggable Mini‑Netty framework with heartbeat, decoding, and responsibility‑chain processing, and outlines future plans for a full‑featured Netty chat application.
This article explains how to design server‑side read/write idle detection and heartbeat mechanisms in a Mini‑Netty framework, covering the theory of heartbeats, idle event handling, a priority‑queue scheduler, and complete starter code with Java NIO examples.
This article explains how to redesign a Java NIO server by introducing a Netty‑style pipeline that separates decoding, logging, authentication, and business handling into independent handlers, improving extensibility, maintainability, and performance while providing complete sample code and initialization steps.
This article explains why direct writes to a Java NIO channel fail for large messages, introduces a write‑queue and OP_WRITE listener to handle partial writes, and provides a complete PacketWriter implementation that transforms synchronous writes into efficient asynchronous operations.
