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 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.
This article introduces NanoID as a modern alternative to UUID, explains how to install and use it in JavaScript projects, compares performance, size, and security, discusses customization options and limitations, and suggests when to prefer NanoID for future development.
This article explains how to identify slow SQL statements, analyze execution plans with EXPLAIN, use profiling and tracing tools, and apply specific optimization techniques such as index tuning, query rewriting, and alternative storage solutions across a range of real‑world cases.
This article provides a comprehensive guide to relational database design with MySQL, covering ER modeling, BCNF and 3NF normalization, storage engine selection, character set and data type choices, and index design principles, illustrated through a student‑course selection example.
This article explains how to evolve a simple single‑server web application into a highly available, horizontally and vertically scalable system for billions of users by covering DNS, vertical and horizontal scaling, load balancing, database replication, sharding, denormalization, SQL/NoSQL choices, stateless design, caching, CDN and global deployment.
This article explains how to globally handle LocalDate, LocalDateTime, and LocalTime parameters in Spring Boot 2.x by creating custom Converter beans, configuring Jackson's ObjectMapper, using @DateTimeFormat, ControllerAdvice, and understanding the underlying parameter resolution mechanisms to avoid common pitfalls such as lambda‑based converter registration failures.
This article compares traditional object creation with Spring’s dependency injection, demonstrating how injecting DAO beans via XML configuration decouples service and data layers, includes Java code examples, test results, and visual analogies of gear systems to illustrate reduced coupling.
This article explains how to add SpringBoot DevTools for hot deployment, integrate Lombok to simplify JavaBean code, and configure the Spring Configuration Processor for property metadata, providing step‑by‑step instructions, IDE settings, and Maven dependency snippets for a smoother development experience.
