Focused on software development, sharing source code and tutorials for various systems.
This article provides a comprehensive guide to Apache PDFBox, covering its licensing advantages, architecture, installation, core operations such as creating, editing, extracting, merging, encrypting PDFs, migration tips from 2.x to 3.x, performance considerations, and recommended use cases for Java backend development.
The article explains how excessive if‑else branching in multi‑business systems leads to maintenance chaos, and demonstrates how a workflow engine combined with plugin extensions can isolate code, simplify extensions, and improve reliability through configurable flow chains and node execution.
The open‑source architecture‑diagram‑generator skill lets you describe a system to Claude or other AI tools and instantly produces high‑quality, dark‑theme architecture diagrams, with zero design effort, fast iteration, built‑in export, and simple installation via a GitHub release, offering a modern alternative to draw.io.
This article introduces FastAPI, compares it with Spring Boot and Flask, explains why its ASGI architecture delivers superior performance, provides step‑by‑step setup and code examples—including routing, validation, dependency injection, async support, database integration, unified responses, middleware, and automatic documentation—then evaluates its pros, cons, ideal use cases, and a real‑world benchmark against Spring Boot.
This guide shows how to register multiple Codex accounts, install the open‑source Codex‑Dream‑Skin project, run its default theme, and then create personalized themes such as forest or star, providing a free alternative to paid Codex theme services.
The CC GUI plugin brings Claude Code and Codex directly into IntelliJ IDEA, offering a unified workbench with file references, diff integration, session management, token cost tracking, and extensible slash commands, while comparing its approach to the official ACP and other AI coding solutions.
This guide walks through integrating Spring AI 2.0 into a Spring Boot application, covering Maven dependency setup, model configuration, ChatClient usage for synchronous and streaming calls, Redis‑backed chat memory for multi‑turn conversations, and testing with Postman and a UI component.
This article walks through Tencent's open‑source TDesign library, covering its cross‑framework component suite, starter‑kit CLI initialization, AI‑friendly MCP server, and step‑by‑step creation of an AI chat page with practical code snippets and screenshots.
This article explains how to implement an online user counting feature by using Redis sorted sets, covering user identification (token or browser fingerprint), adding users with ZADD, querying current online users with ZRANGEBYSCORE, and cleaning up expired entries via ZREMRANGEBYSCORE and ZREM.
This article walks through switching a SpringBoot + MybatisPlus project from MySQL to PostgreSQL, covering driver addition, JDBC URL changes, schema differences, and a detailed list of SQL syntax mismatches and runtime errors with concrete code examples and remediation scripts.
