We share common IT technologies (Java, Web, SQL, etc.) and practical applications of emerging software development techniques. New articles are posted daily. Follow IT Xianyu to stay ahead in tech. The IT Xianyu series is being regularly updated.
This article demonstrates how to automatically convert monetary, percentage, permillage and other numeric fields in Java DTOs by marking target properties with a map or a custom annotation, then applying reflection‑based logic to perform scaling, rounding and unit changes in a reusable utility class.
This article explains how to refactor a Spring MVC Controller by introducing a unified response wrapper, leveraging ResponseBodyAdvice for automatic packaging, applying JSR‑303 validation for @RequestBody, @PathVariable and @RequestParam parameters, creating custom validation annotations, and handling business and system exceptions consistently.
This article introduces Robustdb, a compact open‑source read‑write separation framework built with about ten classes and two thousand lines of code, explains its architecture, routing logic, method‑level transaction handling, dynamic data‑source management, and performance advantages over existing solutions like Atlas.
This tutorial introduces Nginx Proxy Manager, a visual reverse‑proxy management interface, and provides step‑by‑step instructions for installing it via Docker‑Compose, configuring domains, setting up SSL with Let’s Encrypt, and managing proxy hosts through its web UI.
This article explains why the built‑in REST Client in IntelliJ IDEA can replace Postman by offering equivalent request features, environment handling, shared scripts, response assertions, and token management, all within a single development environment.
This article presents seventeen practical Python techniques—including list manipulation, string handling, dictionary operations, and chaining—that are simple to implement yet widely applicable, helping developers write cleaner, more concise, and more efficient code across various domains.
This article explains how MySQL's InnoDB engine guarantees ACID properties by describing the four components of ACID, the four isolation levels, lock granularity and types, the MVCC mechanism with version chains and read views, and the roles of undo, redo, and bin logs in ensuring atomicity, consistency, isolation, and durability.
This article demonstrates how to build a lightweight, plug‑and‑play flow‑orchestration system for microservices by installing Nacos with Docker, configuring SpringBoot services with Kafka and Nacos, and using dynamic Nacos listeners to adjust Kafka topics at runtime without redeployment.
This tutorial explains how to install Spring Boot CLI, demonstrates the project layout, creates a Hello World application using Groovy, shows how to use @Grab for dependencies, run tests, package the app into an executable JAR, and generate new projects with the init command.
This article explains the concept of configuration, enumerates various configuration sources such as hard‑coded values, project files, file‑system files, network‑based stores, JVM startup parameters and OS settings, and discusses their advantages, disadvantages, and suitable usage scenarios for developers.
