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.
kkFileView is a free, Apache‑licensed Spring Boot project that enables online preview of numerous file types—including office documents, PDFs, CAD files, images, archives, and multimedia—offering RESTful APIs, easy deployment, and extensible interfaces for developers seeking a versatile document viewer.
This tutorial explains how to install Docker, configure remote access, create a Spring Boot project in IntelliJ IDEA, add Dockerfile and Maven settings, build a Docker image, run the container, and verify the application through a browser and log inspection.
This tutorial explains how to set up the Hue web UI on a CentOS 7 machine by installing required dependencies, compiling Hue, configuring HDFS, YARN and Hive integration files, starting Hive services, launching Hue, and accessing the interface, with all commands and configuration snippets provided.
This tutorial provides step‑by‑step instructions for installing Hadoop 3.1.1, Homebrew, Hive, and configuring MySQL as Hive's metastore on macOS, including environment variable setup, hive‑site.xml configuration, MySQL connector placement, schema initialization, and verification commands.
The article explains that Java's Integer caching for values between -128 and 127 causes small integer objects to be shared, making == true for 100, whereas larger integers like 1000 are distinct objects, so == returns false, and it demonstrates this behavior with code and reflection examples.
This article demonstrates how to enable browser-based preview of Word, Excel, and PowerPoint files in Java by converting them to PDF streams with Apache OpenOffice and JODConverter, covering installation, Maven setup, utility code, service logic, and controller exposure.
This guide explains why and how to migrate an HTTP website to HTTPS, covering the differences between the protocols, options for obtaining SSL certificates, step‑by‑step installation of the acme.sh script, generating, installing, and automatically renewing certificates using both HTTP and DNS validation methods.
This article explains how to inspect and clear Linux memory buffers, details the information shown by the free command, and provides a comprehensive overview of SQL join types, their performance impact, and optimization techniques such as indexing, join buffer tuning, and algorithm choices.
This article introduces essential Redis operational tools, covering the INFO command for monitoring, Prometheus‑based redis‑exporter visualization, the Redis‑shake data migration utility, Redis‑full‑check consistency verification, and the CacheCloud platform for comprehensive cluster management.
This article explains the principles, features, and implementation details of carrier‑based one‑click login and mobile number verification services offered by China Mobile, China Telecom, and China Unicom, highlighting SDK usage, network requirements, caching, and security considerations.
