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The Dominant Programmer

Resources and tutorials for programmers' advanced learning journey. Advanced tracks in Java, Python, and C#. Blog: https://blog.csdn.net/badao_liumang_qizhi

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Latest from The Dominant Programmer

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The Dominant Programmer

Apr 13, 2024 · Backend Development

Integrating LiteFlow with Spring Boot for Decoupled, Dynamic, Scalable Business Logic

This guide shows how to integrate the lightweight LiteFlow rule engine into a Spring Boot application, split complex business logic into reusable components, configure rule files, and use various component types—including switch, condition, and parameterized components—to achieve dynamic orchestration, hot‑reloading, and high scalability.

Component OrchestrationDynamic workflowJava

0 likes · 13 min read

Integrating LiteFlow with Spring Boot for Decoupled, Dynamic, Scalable Business Logic

The Dominant Programmer

Apr 13, 2024 · Fundamentals

Java Visitor Pattern Example: Managing Employee Access Across Departments in an OA System

This article explains the Visitor design pattern, illustrates its structure, and provides a complete Java implementation that lets HR and finance departments process full‑time and part‑time employee data in an OA system without modifying existing classes.

Design PatternsJavaOA System

0 likes · 11 min read

Java Visitor Pattern Example: Managing Employee Access Across Departments in an OA System

The Dominant Programmer

Apr 12, 2024 · Backend Development

Implementing the Strategy Pattern in Spring with Built‑in @Autowired

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.

AutowiredDependency InjectionJava

0 likes · 8 min read

Implementing the Strategy Pattern in Spring with Built‑in @Autowired

The Dominant Programmer

Apr 12, 2024 · Backend Development

Generate Word Documents from Templates in Java with POI and POI‑TL

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.

Document GenerationJavaPOI

0 likes · 8 min read

Generate Word Documents from Templates in Java with POI and POI‑TL

The Dominant Programmer

Mar 30, 2024 · Backend Development

How to Add Text or Image Watermarks Using Java Graphics2D

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.

BufferedImageGraphics2DImageProcessing

0 likes · 5 min read

How to Add Text or Image Watermarks Using Java Graphics2D

The Dominant Programmer

Mar 30, 2024 · Backend Development

Scrape Web Pages with Jsoup and Export to Excel Using EasyExcel in Java

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.

EasyExcelExcel exporthtml-parsing

0 likes · 9 min read

Scrape Web Pages with Jsoup and Export to Excel Using EasyExcel in Java

The Dominant Programmer

Mar 30, 2024 · Backend Development

Implement OCR in Spring Boot with Tess4J for Image Text Recognition

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.

OCRSpring Bootimage recognition

0 likes · 6 min read

Implement OCR in Spring Boot with Tess4J for Image Text Recognition

The Dominant Programmer

Feb 20, 2024 · Backend Development

Implementing Asynchronous Tasks in Spring Boot with ThreadPoolTaskExecutor

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.

AsynchronousCompletableFutureJava

0 likes · 6 min read

Implementing Asynchronous Tasks in Spring Boot with ThreadPoolTaskExecutor

The Dominant Programmer

Feb 20, 2024 · Backend Development

Integrating XXL‑JOB Distributed Scheduler into SpringBoot with Minimal Intrusion

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.

Backend IntegrationDistributed SchedulerJava

0 likes · 17 min read

Integrating XXL‑JOB Distributed Scheduler into SpringBoot with Minimal Intrusion

The Dominant Programmer

Feb 20, 2024 · Backend Development

Implementing Retry Logic for Third‑Party APIs with Spring Retry in Spring Boot

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.

@EnableRetryJavaRetryable

0 likes · 6 min read

Implementing Retry Logic for Third‑Party APIs with Spring Retry in Spring Boot