Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com
MyBatis, a widely used Java persistence framework, blends SQL mapping with traditional JDBC, requiring developers to write SQL manually, offering greater flexibility and performance than full ORM solutions like Hibernate, while providing only persistence operations without encapsulating complex business logic.
This article explains how to use SpringBoot’s plugin mechanisms—including Java SPI, custom configuration, and Spring Factories—to achieve module decoupling, dynamic extensibility, and easy third‑party integration, and provides step‑by‑step code examples and a complete micro‑service case study.
The article examines why a company might require every HTTP API to use POST, compares GET and POST characteristics, discusses RESTful principles, outlines the trade‑offs of a POST‑only policy, and offers practical guidance for choosing the right method based on business needs.
This tutorial explains OCR fundamentals, introduces the open‑source Tesseract engine and its Java wrapper Tess4J, shows how to download the required traineddata files, and provides step‑by‑step Spring Boot 3 integration, configuration, and test code for Chinese, English, and mixed‑language image recognition, plus important usage notes.
This article explains how Spring employs five core design patterns—Factory, Singleton, Proxy, Observer, and Template Method—detailing their roles, code examples, and how they contribute to Spring's modular, extensible architecture.
The article explains Spring’s event-driven model, detailing how ApplicationEventPublisher, ApplicationListener, and ApplicationEventMulticaster work together to publish, multicast, and handle events, and provides code examples for defining custom events, implementing listeners via interfaces or @EventListener annotations, and configuring asynchronous handling.
This article compares Spring's BeanFactory and ApplicationContext, detailing their roles, loading strategies, feature sets, code examples, and recommended usage scenarios, helping developers choose the appropriate container for their projects.
JEnv tackles the long‑standing pain of juggling multiple Java versions by delivering sub‑second scanning (400 ms on a full‑depth scan), a concurrent Dispatcher‑Worker engine, smart pre‑filtering, cross‑platform support, themed terminals, real‑time statistics, and a modular architecture, all demonstrated with concrete benchmarks and usage scenarios.
The article explains how Redis guarantees atomic operations through single‑command atomicity, MULTI/EXEC transactions, and the WATCH optimistic‑lock mechanism, providing Java/Jedis code examples and discussing their role in ensuring data consistency in distributed systems.
This article explains the concepts, characteristics, default states, and usage patterns of MyBatis first‑level (SqlSession) and second‑level (Mapper) caches, provides Java code demos for each, and compares their scope, lifecycle, consistency, and suitable scenarios.
