This article introduces a Python‑based online movie website built with the Flask framework, detailing its project structure, front‑end using HTML5 and Bootstrap, back‑end in Python 3, MySQL database integration, deployment instructions, and includes screenshots of the UI and architecture.
This article explains the concepts, formats, common problems, and testing applications of cookies, sessions, and tokens, helping readers grasp how these mechanisms work together to manage authentication and state in web applications.
This article explains OAuth2 fundamentals, key terminology, and authorization flows, then guides you through setting up database tables, Spring Boot dependencies, resource and authorization server configurations, multiple grant types, token refresh, permission checks, and common pitfalls, providing complete code snippets and diagrams for a practical implementation.
This guide demonstrates how to integrate Spring Boot with Redis to implement personal search history, hot search ranking, and sensitive word filtering using a DFA algorithm, including Maven dependencies, YAML configuration, utility classes, service implementations, and controller endpoints with full Java code examples.
New Relic’s 2023 Java Ecosystem Report reveals that Java 11 still dominates production, while Java 17 has exploded with a 430% adoption increase in a year, and enterprises are rapidly modernizing Java applications for cloud‑native environments, driven by maintainability and security concerns.
This article details how a finance team tackled a 50‑million‑row MySQL transaction table by designing a horizontal sharding strategy with Sharding‑JDBC, addressing performance bottlenecks, multi‑source transaction handling, pagination across shards, and a phased data migration and rollout plan.
This article explains how to design consistent API return codes by leveraging HTTP status conventions, defining structured error codes with messages, personalizing user‑facing messages, and using unified handling for monitoring and alerting, ultimately reducing communication and maintenance costs.
This article presents a comprehensive set of Spring Boot best practices—including custom BOM management, auto‑configuration, project initialization with Spring Initializr, organized code structure, controller and service design, database isolation, externalized configuration, global exception handling, logging, testing strategies, and concurrency awareness—to help developers build robust, maintainable backend services.
This article introduces OKHttpUtil, a concise Java wrapper for the OkHttp library, outlines its key features, provides Maven dependency instructions, demonstrates GET, POST, file upload, download, and chained request usage, and shows how to integrate and configure it in Spring Boot as well as quickly build external API clients such as eBay.
This article introduces the URule rule engine, explains how to install and configure its open‑source version with Spring Boot, describes its core concepts such as variable, constant, parameter, and action libraries, and demonstrates rule set and decision table creation for real‑world business scenarios.
This article demonstrates how to create a fully reactive backend using Spring Cloud Finchley, WebFlux, Eureka service discovery, and Reactive MongoDB, covering service registration, inter‑service communication with WebClient, and reactive data access to achieve a complete reactive microservices stack.
This article analyzes the evolving demands of network I/O, identifies Linux/x86 bottlenecks, explains DPDK’s bypass architecture and UIO mechanism, and presents practical high‑performance coding and compilation optimizations such as HugePages, SIMD, poll‑mode drivers, and ecosystem tools for modern backend systems.
While Go offers concise syntax, non‑intrusive interfaces, lightweight goroutine concurrency, a simple three‑color garbage collector and a small native binary footprint, Java provides a mature object‑oriented model, extensive libraries, generational GC and robust tooling, making the optimal language choice depend on project performance, ecosystem and development speed requirements.
This article explains five ways to add a bean to the Spring IoC container—including @Configuration + @Bean, @Component + @ComponentScan, various @Import techniques, FactoryBean, and BeanDefinitionRegistryPostProcessor—provides complete code examples for each, and concludes with a summary and related promotional notes.
This guide explains how to create a basic PHP web crawler by using cURL to fetch pages, DOMDocument and XPath to parse HTML, and then storing the extracted data, while also providing a complete example script and reminders about legal and ethical considerations.
JDK 20, a short‑term support release of Java, introduces seven JEPs—including Scoped Values, Record Patterns, Virtual Threads, Structured Concurrency, and the Vector API—along with numerous enhancements and bug fixes, while remaining production‑ready and paving the way for the upcoming JDK 21 LTS.
This article walks readers through downloading and installing Nginx, configuring the server, launching the service, creating a basic HTML page, and using a free tunneling tool to make the site accessible from the internet, while also including promotional links to related resources.
This article presents a comprehensive collection of PHP payment interview questions covering implementation steps, amount validation, SQL injection prevention, request fraud protection, data encryption, secure credential storage, callback handling, and OAuth integration, providing detailed answers and code examples for each topic.
This article walks through a real‑world Python web‑scraping case, showing how to retrieve disease‑pest data from the Shandong government site using custom headers, cookies, and request parameters, and provides two complete code examples that successfully return the desired JSON results.
This article examines Node.js’s strengths and weaknesses, its event‑driven architecture, practical code examples, middleware usage, impact on front‑end development, and forecasts its role in future trends such as cloud‑native, serverless, IoT, and AI applications.
This article explains Spring's transaction propagation behaviors, rollback mechanisms, common pitfalls such as self-invocation, and provides solutions using AOP proxies and @EnableAspectJAutoProxy, supplemented with code examples and a brief promotion of a related community.
PowerJob is a modern distributed job scheduling and computation framework that supports CRON, API, fixed‑rate and fixed‑delay strategies, offers visual workflow orchestration, multiple execution modes, and provides a lightweight, high‑availability solution for complex backend processing tasks.
This article reviews several Java technologies that have become obsolete or less relevant—such as JSP, Struts, Hibernate, Applet, Swing, JDBC, and XML—explaining why newcomers can safely ignore them and focus on modern alternatives like Spring MVC, MyBatis, and deep Servlet knowledge.
This article explains how to build a reusable Java utility for exporting large Excel reports using Apache POI, covering header configuration, data transformation, cell formatting, multithreaded data retrieval, asynchronous handling of long‑running exports, and provides full source snippets and SQL schema examples.
This article introduces Alibaba's Sentinel library, explains its core concepts of resources and rules, provides step‑by‑step Java demos—including basic usage and Spring Boot integration—then dissects the internal processor‑slot architecture that powers flow control, circuit breaking, and system protection.
This tutorial explains how to integrate the Drools business rule engine into a Spring Boot project to calculate flexible e‑commerce discounts based on customer type, age, and order amount, showing dependency setup, configuration, model definitions, DRL rules, service and controller layers, and a test run.
This article explains the concept of layered architecture for Java SpringBoot projects, introduces a nine‑layer structure, discusses each layer’s responsibilities, shows concrete code examples for utilities, infrastructure, domain, service, integration, facade, client, controller and boot modules, and summarizes the five design dimensions of single responsibility, noise reduction, adaptation, business logic, and data purity.
This article explains the MVC pattern, the role of the DAO layer, details Spring MVC’s request handling flow, introduces key annotations such as @RequestMapping, @RequestParam, @RequestBody, and @PathVariable, and describes how to implement and register interceptors and request filters for comprehensive request processing.
This article provides a comprehensive overview of Java 8's Stream API, explaining its core concepts, composition, BaseStream and Stream interfaces, the differences between parallel and sequential streams, the underlying ForkJoinPool mechanism, performance factors, and best practices for effective use in backend development.
This article explains how to use Spring's profile‑specific configuration files, package a multi‑module Java project with Maven or IDEA, and deploy the resulting JAR on a Linux server by installing JDK, setting environment variables, and starting the application in foreground or background.
This article explains five core techniques for adding beans to the Spring IoC container—including @Configuration with @Bean, @ComponentScan, various @Import strategies, FactoryBean, and BeanDefinitionRegistryPostProcessor—providing code examples and key considerations for each method.
This article explains Groovy’s def keyword as a mutable, untyped variable, shows how it differs from Java’s var, demonstrates dynamic reassignment, and provides a practical JSON‑to‑object conversion example that simplifies code while leveraging IntelliJ’s type inference.
This article provides an in‑depth guide to Spring Batch, covering its overall architecture, supported business scenarios, core components such as JobRepository, JobLauncher, Job, Step, and ItemReader/Processor/Writer, and demonstrates practical implementations including Maven configuration, multi‑step jobs, parallel flows, decision logic, nested jobs, data readers, writers, processors, and scheduling integration.
This article provides a comprehensive overview of Spring Batch, covering its purpose, typical business scenarios, core architecture and interfaces, and detailed step‑by‑step code examples for configuring jobs, steps, flows, parallel execution, decision making, nested jobs, data reading and writing, item processing, and job scheduling within a Spring Boot application.
Async‑fork shifts the costly page‑table copying from Redis’s parent process to its child, allowing the parent to resume handling queries instantly and cutting snapshot‑induced latency spikes by over 98%, thereby dramatically improving tail latency during AOF rewrites, RDB backups, and master‑slave synchronizations.
An in‑depth walkthrough of Spring Boot 2.7.10 with Spring Cloud Gateway 3.1.6 shows how the RouteToRequestUrlFilter, ReactiveLoadBalancerClientFilter, NettyRoutingFilter, and NettyWriteResponseFilter sequentially transform incoming URLs, resolve service instances via load balancing, and forward requests to target microservices.
This comprehensive guide introduces Dubbo, a high‑performance Java RPC framework, covering its core concepts, architecture, configuration methods, load‑balancing and fault‑tolerance strategies, underlying communication mechanisms, and extension points, helping developers build robust distributed applications.
Netty is a high‑performance, asynchronous, event‑driven NIO framework widely used in Java backend systems such as Dubbo and RocketMQ, and this article explains its fundamentals, key characteristics, architectural layers, high‑performance design, core components, and typical application scenarios across internet, gaming, and big‑data domains.
This guide walks through installing CentOS Stream 9, configuring Aliyun and EPEL repositories, adding the Remi PHP 8.2 repo, and then deploying Nginx, PHP‑FPM, MySQL 8, Redis and supporting tools via Docker and DNF, all with fast domestic mirrors.
This guide explains the browser's same‑origin policy, defines cross‑origin requests, outlines the restrictions on non‑same‑origin resources, and presents five Java‑backend techniques—including a global CorsFilter bean, WebMvcConfigurer, @CrossOrigin annotation, manual response headers, and a custom filter—to enable CORS.
This article explains Java 8 Stream API's concepts, composition, pipelining, internal iteration, parallel execution using ForkJoinPool, performance considerations, and best practices, providing code examples and detailed analysis for developers seeking to write efficient, clean, and scalable backend Java code.
This article provides a comprehensive overview of Spring Cloud fundamentals, including core components, microservice concepts, service discovery, load balancing, circuit breaking, and related tools such as Eureka, Zookeeper, Hystrix, Ribbon, and Feign, presented as a series of typical interview questions and answers.
This article describes a PHP‑based web crawler that extracts links and images using regular expressions, stores URLs in MySQL, handles duplicate detection via MD5, discusses performance limitations, and provides the full source code and usage instructions.
The article explains Spring's three dependency injection methods, highlights the drawbacks of field injection, recommends constructor injection, and demonstrates how Lombok's @RequiredArgsConstructor can generate the required constructor to eliminate @Autowired and @Resource annotations, simplifying code and preventing NullPointerExceptions.
This article explains how to dynamically manage multiple data sources and ensure transaction consistency across them in Spring applications, covering both configuration‑file and database‑table approaches, custom AOP switching, and a bespoke multi‑database transaction mechanism.
This article explains what an API gateway is, outlines its core data‑plane and control‑plane functions, compares popular open‑source gateways such as Nginx, Zuul, Spring Cloud Gateway, Kong and Traefik, and details a company‑specific microservice gateway built on Traefik with Etcd and Go.
In this article, the author explains a common SQLAlchemy error caused by upgrading from version 1.4.42 to 2.0.7, demonstrates how the missing 'encoding' parameter leads to failures, and provides a clear solution along with practical tips for asking technical questions in Python communities.
This article explains three methods—editing php.ini, using ini_set, and calling set_time_limit—to increase PHP's default 30‑second script execution limit, and provides guidance on when each method is appropriate.
The article explains that MyBatis PageHelper performs an extra full‑table count query causing pagination to take over eight seconds on a 10,000‑row table, analyzes the root cause, and provides a concrete solution by customizing the count SQL with a _COUNT method and optimized mapper definitions.
This tutorial shows how to use GitHub Copilot in VS Code to quickly generate a Java application that loads, parses, and prints data from CSV files, including creating example CSV content, adding column‑name output, and downloading CSVs from a URL.
This article provides an in‑depth technical comparison between the mature Drools rule engine and the newer LiteFlow framework, covering definitions, expression syntax, Java integration, API usage, coupling, learning curve, tooling, storage, hot‑reloading, UI support, performance benchmarks, and overall suitability for complex business logic.
This article explains how to build a generic Java utility that exports any list of objects to an Excel‑compatible CSV file by using reflection to extract field names for headers and values for rows, includes Maven dependencies, custom annotations, and practical usage examples.
This article explains eight bean types that Spring's @Autowired can inject—including single beans, collections, arrays, maps, lazy proxies, Optional, ObjectFactory/ObjectProvider, and JSR‑330 Provider—showing how each works and when to use them.
This article explains Spring's transaction abstraction, detailing the roles of PlatformTransactionManager and ReactiveTransactionManager, the TransactionDefinition attributes, TransactionStatus interface, resource synchronization techniques, declarative transaction management with AOP, rollback rules, and provides XML and Java configuration examples for both JDBC and Hibernate environments.
The article explains how to process a batch of overdue unpaid orders in a Spring scheduled task by wrapping each order's business logic in a separate REQUIRES_NEW transaction, catching exceptions, and manually rolling back only the failing transaction so that other orders remain unaffected.
This article presents SuperScheduled, a SpringBoot starter that enhances native @Scheduled tasks by enabling dynamic runtime management, custom cron, fixedDelay and fixedRate adjustments, and a plug‑in AOP‑like enhancement mechanism without modifying existing scheduled methods.
This article explains the underlying principles of Swoole coroutines, compares them with Go's goroutine model, outlines important usage considerations, contrasts Swoole with Workerman, describes coroutine communication methods, and provides practical PHP performance optimization tips.
Explore how Spring Boot 2.6.14 automatically configures Spring MVC, including view resolvers, static resources, converters, message converters, JSON serialization, content negotiation, and error handling, and learn how to customize these features with WebMvcConfigurer, WebMvcRegistrations, and related beans for full control.
This article demonstrates how to consolidate user login verification, exception handling, and response formatting in a Spring Boot application by using AOP, HandlerInterceptor, @ControllerAdvice, and ResponseBodyAdvice, providing complete code examples and explaining the underlying request processing flow.
This article explains two methods to locate the php.ini file and view installed PHP extensions—using a simple PHP script with phpinfo() and the command‑line tools php -m and php --ini—while also promoting a PHP online training class with enrollment details.
This article explains how to implement asynchronous processing in Java Spring Boot using the @Async annotation, the built‑in AsyncManager, and a custom ThreadPoolExecutor, providing code examples, configuration steps, and best‑practice tips for managing background tasks without blocking the main thread.
This article provides a comprehensive overview of Spring Boot and related Spring annotations, explaining their purposes, usage patterns, and code examples, helping developers master configuration, component scanning, conditional bean registration, and core Spring Boot features for efficient backend development.
This article explains how the Taobao Search team tackled the inconsistency and high maintenance cost of manually written API docs by introducing a standardized annotation format, a custom annotation processor, automated JSON generation, and script‑based data reporting to keep cross‑platform API information accurate and readily usable for both backend and frontend developers.
This article introduces JSqlParser, a Java library that parses SQL statements into object structures, demonstrates how to extract query components with sample code, lists supported databases, and highlights additional features like formatting and framework integration.
This guide demonstrates how to integrate the MybatisX IDEA plugin with a Spring Boot project, covering database setup, Maven dependency configuration, plugin installation, connection testing, code generation, and sample controller implementation to accelerate MyBatis and MyBatis-Plus development.
This article introduces the MyBatis‑Plus Generator UI, a highly customizable web‑based code generator for Spring Boot projects, explains how to integrate it via Maven, run it, use its rich features for entity, mapper, service and controller generation, and extend it with custom templates and name‑conversion rules.
The article explains Apache’s three processing models (prefork, worker, event), compares their resource usage with Nginx, and demonstrates how Nginx’s event‑driven, single‑threaded architecture achieves far higher concurrent connection capacity and better performance for web services.
This article demonstrates how to build a custom Spring Boot auto‑configuration and starter, including a conditional annotation, a WriterTemplate utility that writes to a database or file, Maven setup, property binding, and a usage example that shows the bean being auto‑configured and invoked.
Git 2.40 introduces several enhancements such as Emacs support for git jump, corrected batch‑check size reporting, new --source option for check‑attr, native C implementation of git bisect, removal of legacy interactive add, and additional options for merge‑tree and Bash completion.
This article demonstrates practical PHP refactoring techniques—including expressive naming, method extraction, early returns, leveraging Laravel collections, and maintaining code consistency—by showing before-and-after code examples that improve readability, reduce duplication, and simplify logic for backend developers.
The article reviews a comprehensive Spring framework book that covers the entire Spring family—from core concepts and data access to web development and cloud‑native microservices—using a practical, localized approach and a large milk‑tea shop case study to guide both beginners and experienced Java developers.
This article explains the Java Service Provider Interface (SPI) concept, demonstrates how to implement and test SPI with ServiceLoader, compares its limitations, and shows how Spring extends SPI using spring.factories for more flexible and efficient service loading.
Elon Musk repeatedly pledged to open‑source Twitter’s recommendation algorithm, yet after massive layoffs and the loss of key engineers, the promised code remains hidden, illustrating how managerial decisions can cripple open‑source initiatives and impact platform trust and performance.
This article shares a practical, seven‑step methodology for tackling large open‑source projects like Redis, covering project mapping, prerequisite knowledge, starting with core modules, following the main execution path, handling complex functions, branching into secondary features, and finally filling knowledge gaps.
The article details multiple ways to skip unit tests when packaging a Maven Java project, including command‑line flags, pom.xml configuration, IDE settings, and Maven runner VM options, enabling developers to build JAR files without test execution when production configurations are needed.
This article explains Redis's compressed list structures—ZIPLIST and its successor LISTPACK—detailing their layouts, encoding schemes, query and update complexities, and how LISTPACK resolves ZIPLIST's chain‑update performance issues to provide a more memory‑efficient list implementation.
This article presents a detailed analysis of modern payment system architecture, covering the transaction and payment cores, service governance, data consistency, asynchronous processing, and practical production practices such as performance testing and stability management, illustrated with numerous diagrams.
This article explains three Redis‑based rate‑limiting techniques—using setnx for simple counters, leveraging ZSet for a sliding‑window algorithm, and applying a token‑bucket pattern with List—provides Java code examples for each method, discusses their advantages and drawbacks, and shows how to integrate them into backend services.
The article explains the classic cache consistency problem between MySQL and Redis, analyzes how inconsistencies arise, and details four cache‑update design patterns—delete‑then‑update, cache‑aside, read/write‑through, and write‑behind—highlighting their workflows, advantages, and drawbacks.
Spring Boot 3.0.4 arrives early, addressing a PathMatchingResourcePatternResolver issue that broke bean and controller scanning, and brings 19 bug fixes, documentation enhancements for Gradle 8 and other topics, plus numerous dependency upgrades across Couchbase, Jetty, Reactor, Spring Framework, and more.
This guide walks through building and configuring NGINX 1.22 with OpenTracing and Jaeger, covering required dependencies, compiling gcc, cmake, jaeger-client‑cpp, and the nginx‑opentracing module, and shows how to set up tracing configuration and verify spans in Jaeger.
This article explains the Alibaba Java development specification for layered domain models, detailing the purpose and naming conventions of DO, DTO, BO, AO, VO, Query objects, and further clarifies the roles of PO, VO, DAO, BO, DTO, and POJO in Java backend architecture.
Spring Boot 3.0.4 arrives ahead of schedule, fixing 19 issues—including a path‑matching bug that broke bean scanning—while adding documentation updates and upgrading key dependencies such as Couchbase, Jetty, and Spring Framework, providing developers with a more stable backend platform.
This article introduces FastMyBatis—a lightweight, zero‑configuration MyBatis extension for Spring Boot—covering its core principles, Maven setup, sample CRUD controller, service and mapper implementations, a comprehensive list of mapper methods, Query object usage examples, and links to the open‑source repository.
FFmpeg 6.0 "Von Neumann" introduces a host of new codecs, decoders, filters, CLI enhancements, ABI versioning, and a more frequent release cadence, offering developers expanded multimedia processing capabilities and improved performance across platforms.
This article walks through a complete TCP connection example in Node.js, detailing server and client code, the three-layer Node.js architecture (JS, C++, C), the initialization process, Libuv’s event‑loop phases, task scheduling, I/O models, and how Node.js maintains non‑blocking, concurrent connections.
This article examines how MyBatis leverages around ten core design patterns—including Factory, Singleton, Builder, Adapter, Proxy, Composite, Decorator, Template, Strategy, and Iterator—to decouple complex scenarios, improve modularity, and streamline ORM operations within its extensive codebase.
Cloudflare engineers have rewritten a core Nginx module in Rust, creating the Pingora proxy to replace Nginx, improve performance and safety, and pave the way for a future backend infrastructure without Nginx, highlighting Rust’s security benefits for complex, high‑scale services.
This article explains how Spring enables transaction management through @EnableTransactionManagement, details the underlying proxy mechanism, outlines the basic and detailed execution flow, describes transaction propagation types and their classifications, and shows how to force rollback and use TransactionSynchronization for custom callbacks.
This release note details SpringBoot 3.0.3 bug fixes, documentation updates, and dependency upgrades, and introduces Spring Cloud 2021.0.6 with its new features, module improvements, and a concise Maven dependencyManagement snippet, providing developers with a comprehensive overview of the latest stable versions.
This article explains the role of network communication in RPC, compares blocking I/O, non‑blocking I/O, I/O multiplexing and asynchronous I/O, discusses why blocking I/O and multiplexing dominate, introduces zero‑copy techniques at the OS and Netty levels, and shows how Netty optimizes data handling for high‑performance RPC.
This article explains how Spring MVC processes exceptions using the DispatcherServlet and a configurable HandlerExceptionResolver chain, outlines the built‑in resolver implementations, shows how to customize error pages, and provides code examples for handling errors in both HTML and JSON responses.
This article explains the fundamentals of REST and gRPC APIs, compares their design constraints, features, and typical use cases, and helps developers choose the most suitable framework for building scalable, high‑performance microservice architectures.
Javalin is a lightweight Java web framework that supports WebSocket, HTTP/2, and asynchronous requests, offering simple configuration, route definitions, parameter validation, handlers, access management, and easy deployment via an embedded Jetty server, with examples and troubleshooting tips for common issues like port conflicts.
This article walks through a hands‑on Go RPC demo, explains the underlying server and client mechanisms, explores registration, HTTP handling, request processing, object pooling, and the gob codec, and clarifies why Go includes RPC alongside HTTP.
This tutorial walks through the evolution from manual Redis calls to Spring Cache abstraction, explains AOP‑based proxying, details core annotations, demonstrates Caffeine and Redisson integration, explores list caching, and shows how to build a custom two‑level cache for high‑performance Java back‑ends.
This tutorial explains how to implement a like/unlike feature using Spring Boot, Redis caching, and periodic persistence to a database with Quartz, covering data modeling, key design, service layers, controller APIs, and scheduled synchronization.
This article explains how to create a unified response class, define custom exception and error‑enum types, and implement a global exception handler in Spring Boot, enabling clean error handling, reduced boilerplate, and flexible business‑specific extensions.
This article explains the concept of scaffolding for software development, outlines why it is essential for microservice architectures, compares custom persistence solutions with Spring Data, and reviews popular backend scaffolding tools such as Spring Boot, Maven, Netty, Java EE, and Dropwizard.
This tutorial explains what MybatisX is, outlines its advantages, and provides a detailed, code‑rich walkthrough for integrating the plugin into a Spring Boot project, configuring the database, generating MyBatis‑Plus entities, and writing a simple controller to query data.
