Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.
This guide shows how to configure Jackson in Spring Boot to consistently format LocalDateTime, Date, and String parameters as "yyyy-MM-dd HH:mm:ss", covering global settings via application properties, field-level @JsonFormat, custom serializers/deserializers, and unified handling in REST controllers.
This guide walks you through Maven installation, local repository configuration, dependency coordinates, common Maven commands, profile usage, multi‑module project setup, the difference between dependencyManagement and dependencies, and practical Maven tricks such as installing local jars, removing version numbers from generated artifacts, and resolving dependency conflicts.
This guide explains how Maven repositories and mirrors work, the role of the mirrorOf attribute, how to set up central and third‑party repositories in pom.xml, configure mirrors in settings.xml with various matching rules, and properly configure private repository deployment with authentication and profile activation.
This article consolidates essential Java date and time utilities—including start/end calculations for days, weeks, months, quarters and years, time arithmetic, formatting, parsing, and conversions between LocalDateTime, Date, and Instant—providing a handy reference for developers working with the Java Time API.
This article explores how time is represented in computers, explains historic bugs like the Y2K and the upcoming 2038 issue, clarifies GMT/UTC, time zones and daylight saving, and compares 32‑bit and 64‑bit timestamps, Java long handling, and architectural differences that affect time calculations.
This article walks through using MySQL to pivot rows into columns, covering storage concepts, practical CASE‑WHEN aggregation techniques, and detailed SQL examples for sum, count, average and max calculations, while also discussing performance considerations for medium‑scale and large‑scale data workloads.
This article introduces ZeroNews, a cloud‑based intranet‑penetration service that supports HTTP, HTTPS, TCP and UDP, explains how to register, obtain a token, install the client on various platforms, configure mappings, and compares its pros, cons, and features against ngrok, frp and Cloudflare Tunnel.
This tutorial walks you through API protocol types, Swagger/OpenAPI documentation setup, advanced configuration, environment‑specific activation, UI enhancement with Knife4j, and practical versioning strategies to efficiently manage and evolve your backend APIs.
This article explains why Swagger falls short for API debugging in production, outlines the recurring issues developers face, and shows how Apifox’s import, environment variables, global parameters, pre‑ and post‑scripts, mock data, and cURL import features streamline API development and testing.
This article explores how to apply core design patterns—Observer, Factory, Proxy, and Template Method—in Java middleware development, illustrating each pattern with practical code snippets and explaining the design rationale for building maintainable, extensible, and flexible services.
