Resources and tutorials for programmers' advanced learning journey. Advanced tracks in Java, Python, and C#. Blog: https://blog.csdn.net/badao_liumang_qizhi
The article shows how to replace bulky if‑else logic in Spring Boot by using the strategy pattern together with a factory that autowires all Strategy implementations into a Map, explains the @Autowired semantics for collections, and provides concrete code examples.
This article walks through using the Apache POI and POI‑TL libraries to render Word (.docx) files from custom templates, covering version compatibility, template syntax, data model definitions, and step‑by‑step code examples for text, images, tables, and charts.
This guide walks through reading local or network images in Java, creating a Graphics2D canvas, and applying either a red semi‑transparent text watermark or a scaled image watermark at pixel‑specified coordinates before saving the result as a PNG file.
This article demonstrates how to use Jsoup to fetch and parse HTML content from a web page, extract specific table data via CSS selectors, map the data to Java objects, and efficiently write the results to an Excel file with EasyExcel, highlighting memory advantages over POI.
This guide shows how to integrate the open‑source Tesseract OCR engine into a Spring Boot application using the Tess4J Java wrapper, covering Chinese language data setup, Maven dependency configuration, bean creation, service implementation, and a unit test to verify image text extraction.
This article explains how to configure Spring Boot's built‑in ThreadPoolTaskExecutor, customize its core parameters, and use it together with Java 8 CompletableFuture to run asynchronous tasks, including a performance comparison with a synchronous implementation.
This guide walks through XXL‑JOB’s core features, shows how to download and set up the admin console, configure a SpringBoot executor, and implement various job types—including simple, sharding, command‑line, HTTP, and lifecycle tasks—complete with code samples and UI screenshots.
This guide shows how to add a retry mechanism to Spring Boot applications using Spring Retry, covering dependency setup, enabling @EnableRetry, defining @Retryable with custom back‑off settings, handling failures with @Recover, writing unit tests, and observing behavior with different retry counts and exception filters.
This guide shows how to configure Spring Boot, MyBatis‑Plus and the dynamic‑datasource starter to connect to MySQL, SQL Server and PostgreSQL, add and remove data sources at runtime, verify their availability, and perform manual switching using a utility class and functional interfaces.
This guide walks through integrating Spring Data Elasticsearch into a Spring Boot application, covering entity mapping annotations, repository creation, service layer implementation, and unit tests to perform create, read, update, delete, and fuzzy search operations on Elasticsearch indices.
