This article reviews the Java ecosystem, explains criteria for deeming technologies outdated, and advises developers to drop JSP, Struts, Hibernate, Applet, Swing, JDBC, and XML while focusing on mastering Servlets, Spring MVC, and lightweight ORM tools like MyBatis.
This article explains the differences between Spring MVC interceptors and servlet filters, provides complete Java code examples for both, describes how to configure them in Spring and web.xml, and summarizes their respective scopes, lifecycles, and typical use‑cases in web development.
This article walks through implementing symmetric encryption for both request and response bodies in a Spring MVC project, covering requirement analysis, data model design, custom ControllerAdvice for decryption and encryption, serialization challenges with FastJson and Jackson, and final configuration to ensure consistent API output across Android, iOS, and H5 clients.
Drawing on two decades of Java experience, this article evaluates outdated Java technologies—JSP, Struts, Hibernate, and others—based on real‑world development relevance, interview usefulness, and depth of understanding, and offers clear recommendations on what to skip and what to master.
The article reviews decades of Java development, explaining why technologies such as JSP, Struts, Hibernate, Applet, Swing, JDBC, and XML are now largely obsolete for new learners, and recommends focusing on Spring MVC, MyBatis, and a deep understanding of Servlets.
This article explains the conceptual differences between Spring MVC interceptors and servlet filters, demonstrates how to implement each with Java code, shows the necessary configuration in Spring and web.xml, and summarizes their respective use cases, lifecycles, and limitations for backend development.
This article explains how to structure API responses in a micro‑service architecture, defines a unified JSON format with status codes, shows how to use annotations and interceptors to automatically wrap results, and demonstrates code refactoring for cleaner, more maintainable controller logic.
This article explains the conceptual differences between Spring MVC interceptors and Servlet filters, shows how to implement each with Java code, details their configuration in Spring and web.xml, and summarizes when to use one over the other in backend development.
This article explains how to design a clean Controller layer in Spring MVC by implementing unified response structures, handling String response issues with ResponseBodyAdvice, applying parameter validation with JSR‑303, and creating custom exceptions with centralized exception handling to simplify business logic.
This article presents a step‑by‑step guide on securing Spring MVC interfaces by encrypting and decrypting both GET and POST requests using symmetric AES, custom ControllerAdvice components, and Jackson configuration to ensure consistent JSON serialization across mobile, H5, and backend services.
This guide explains how Spring Boot 2.4.12 automatically configures Spring MVC components such as view resolvers, converters, and message handlers, and shows how to customize them via WebMvcConfigurer, WebMvcRegistrations, HttpMessageConverters, and @JsonComponent, including code examples for full control over the Web MVC setup.
This article demonstrates how to secure GET and POST API endpoints in a Spring MVC application by encrypting request bodies and responses with AES, using custom ControllerAdvice classes, handling serialization issues with FastJSON and Jackson, and configuring ObjectMapper for proper date and enum formatting.
This article explains how to redesign a Spring MVC controller so that a single endpoint can seamlessly handle JSON payloads, URL‑encoded form data, and multipart file uploads by creating a custom annotation, resolver, and Spring configuration, avoiding the pitfalls of manual HttpServletRequest parsing.
This article explains what thread safety means, demonstrates how a simple counter can become unsafe under concurrent requests, shows Java code examples of the problem and its synchronized solution, and provides practical guidelines for ensuring Spring MVC controllers remain thread‑safe by avoiding shared mutable state or using synchronization mechanisms such as synchronized blocks or ThreadLocal.
The article explains that Spring MVC Controllers are singleton beans by default, discusses the thread‑safety risks of using instance variables in such Controllers, and presents several solutions—including prototype scope, ThreadLocal, and AtomicInteger—to ensure safe concurrent handling of requests.
This article explains the concept of streaming queries, introduces MyBatis's Cursor interface with its key methods, and provides three practical solutions—using SqlSessionFactory, TransactionTemplate, or @Transactional—to keep database connections open and avoid cursor‑closed errors in Spring MVC applications.
This article explains the newly disclosed Spring Framework remote code execution flaw affecting JDK 9+ Spring MVC/WebFlux applications deployed as WARs on Apache Tomcat, outlines the affected conditions, current patch status, and provides code‑level workarounds for safe remediation.
This article explains how to make a Spring MVC endpoint simultaneously accept JSON, URL‑encoded form data, and multipart/form‑data by creating a custom @GamePHP annotation, implementing dedicated argument resolvers, and configuring the necessary beans to replace the default @RequestBody and @RequestParam handling.
This article explains the differences between @RestController and @Controller, shows how @RestController combines @Controller with @ResponseBody, and details the internal processing flow of the @ResponseBody annotation within Spring MVC's handler adapters and return‑value handlers.
This guide explains the fundamentals of Netty, shows how to combine it with Spring MVC using DispatcherServlet, and provides complete Java code examples for a Netty server, channel pipeline, request handler, server startup, and a sample controller, along with practical configuration tips.
This article explains how to combine Netty and Spring MVC by creating a Netty server, configuring the channel pipeline, implementing a request handler that forwards to DispatcherServlet, initializing the servlet, and providing a sample controller with troubleshooting tips for character encoding and configuration files.
This article provides a detailed overview of Spring MVC request‑mapping annotations, Spring Bean and dependency‑injection annotations, and essential Spring Boot configuration annotations, illustrating their usage with code examples and explaining how they work together to build robust backend applications.
This article explains the concept of Spring parent-child containers, their roles in separating web and service layers, the startup sequence of root and servlet WebApplicationContexts, how to verify their existence, and answers common configuration questions with code examples and diagrams.
Spring Framework 6.0 milestone introduces Jakarta EE package migrations, updates core containers, overhauls persistence APIs, modernizes servlet middleware with Tomcat 10, Jetty 11, Undertow 2.2.14, removes legacy components, and changes controller scanning and HttpMethod handling, while offering resources for learning Spring Boot and Cloud.
This article explains, using servlet source code as a starting point, how Spring MVC registers @RequestMapping‑annotated controllers into RequestMappingHandlerMapping during container initialization and how the DispatcherServlet processes incoming HTTP requests by locating the appropriate HandlerMethod through a series of handler mappings and interceptor chains.
Explore Spring Web MVC's functional programming model (WebMvc.fn) in Spring Boot 2.4.12, covering immutable ServerRequest/ServerResponse, RouterFunction routing, handler functions, predicates, nested routes, filters, validation, and practical code examples for building clean, annotation‑free REST endpoints.
This guide explains Spring MVC's request handling flow, detailing core components like DispatcherServlet, HandlerMapping, and HandlerAdapter, and demonstrates multiple controller definitions—including @RestController, HttpRequestHandler, Controller interface, and HttpServlet extensions—along with necessary configuration snippets.
This article provides a detailed tutorial on Spring's RestTemplate class, covering its overview, setup, and extensive examples of GET, POST, file download, header handling, dynamic URL parameters, and integration with HttpClient and OkHttp, along with complete code snippets and best‑practice recommendations for backend Java development.
This article explains the internal workflow of Spring MVC’s HandlerMethodArgumentResolver for processing controller method parameters, walks through the core source code steps, and demonstrates how to implement and register a custom argument resolver using a bespoke annotation.
This article explains step‑by‑step how Spring MVC handles an incoming HTTP request, detailing the roles of DispatcherServlet, HandlerMapping, HandlerAdapter, argument and return value resolvers, and ViewResolver, and includes key code excerpts that illustrate the matching and initialization processes.
This article provides a comprehensive overview of Spring MVC request‑mapping annotations, core Spring Bean annotations, dependency‑injection and scope configurations, container setup annotations, and essential Spring Boot annotations, each illustrated with clear code examples and usage tips.
This article walks through fourteen practical techniques for building Spring MVC controllers, covering annotation‑based definitions, interface implementation, extending abstract classes, URL mapping, request method handling, parameter binding, model handling, redirects, form validation, file uploads, autowiring services, and best practices such as single‑responsibility and domain‑specific controller design.
This article explains how Spring Boot registers custom error pages with its embedded Tomcat container, covering default HTML/JSON error responses, the underlying auto‑configuration classes, BeanPostProcessor registration, and the BasicErrorController that serves the default /error endpoint.
The article dissects Spring MVC’s core request flow, detailing how DispatcherServlet extends HttpServlet, delegates to FrameworkServlet, and ultimately routes requests through doService, doDispatch, handler adapters, interceptors, and result processing, with code excerpts illustrating each step.
This article explains how Spring MVC evolved from basic Servlets to a front‑controller architecture, detailing the roles of DispatcherServlet, HandlerMapping, HandlerInterceptor, ModelAndView, and ViewResolver in streamlining request handling, business logic separation, and view rendering for modern Java web applications.
This article provides a step‑by‑step tutorial for building a hospital registration web application with Java, Spring MVC, MyBatis, JSP pages, and MySQL, covering environment setup, database schema, DAO interfaces, service implementation, controller logic, and front‑end pages.
This article provides a comprehensive guide to Spring MVC request‑mapping annotations, Spring Bean lifecycle and dependency‑injection annotations, as well as Spring Boot conditional and configuration annotations, illustrating each with code examples and usage notes for Java backend development.
This article explains that Spring MVC controllers are singleton by default, illustrates the thread‑safety problems caused by shared instance variables with concrete code examples, and provides practical solutions such as avoiding state, using prototype scope, ThreadLocal, or AtomicInteger to make controllers safe under high concurrency.
This guide explains how Spring MVC can automatically negotiate response formats using the Accept header, allowing a single endpoint to return either JSON or XML based on a query parameter or MIME type, without duplicating code or routes.
This tutorial explains fourteen practical techniques for building Spring MVC controller classes, covering annotation‑based definitions, interface implementation, extending AbstractController, URL mapping, request method handling, parameter binding, model handling, redirects, form validation, file uploads, dependency injection, and best practices such as single‑responsibility and domain‑specific controllers.
This article presents a complete Java‑based hospital registration system built with Spring MVC, MyBatis, and JSP, detailing the development environment, database schema, source code for controllers, DAOs, services, configuration files, and web pages to enable patient search, registration, and status updates.
This article explains how to set up permission validation in a Spring MVC project using user‑role‑resource tables, compares three verification approaches, and demonstrates a custom annotation solution with full controller and interceptor code examples.
Spring MVC lets developers retrieve request data using the raw HttpServletRequest, or more conveniently with annotations such as @RequestParam, @RequestHeader, @RequestBody, and @CookieValue, supports automatic binding to POJOs including nested objects, injects native Servlet objects like HttpSession, and handles character encoding via CharacterEncodingFilter.
This guide demonstrates how to create a custom request‑handling method, register it programmatically with Spring MVC's RequestMappingHandlerMapping, and explains the underlying handler detection and mapping process in Spring Boot 2.2.
This article explains how to implement permission validation in Spring MVC by defining user, role, and resource tables, exploring three approaches—including request URI checks, method inspection, and custom annotations—and provides complete Java code examples for a custom annotation, controller, and interceptor to enforce access control.
This article explains why CORS problems arise in front‑end/back‑end separation, introduces the CORS standard and request types, details the required response headers, and provides three concrete Spring Boot solutions—including global configuration, filter‑based handling, and the @CrossOrigin annotation—complete with code examples and migration notes.
This article provides a detailed overview of the most commonly used Spring Boot, Spring MVC, and JPA annotations, explains their purposes, shows how they interact, and includes practical code examples for building robust Java backend applications.
This article explains the concept of streaming queries, introduces MyBatis's Cursor interface, demonstrates common pitfalls such as closed cursors, and provides three practical solutions—using SqlSessionFactory, TransactionTemplate, or @Transactional—to keep database connections open while processing large result sets.
This article explains the fundamentals of Servlet 3.0 asynchronous processing, demonstrates how Spring MVC builds on the Servlet API, and provides multiple practical examples—including starting async support, using AsyncContext, custom threads, listeners, timeouts, and real‑world scenarios—to help developers master non‑blocking request handling in Java web applications.
This article explains how Spring MVC evolved from basic Servlets to a sophisticated two‑level controller architecture, detailing the roles of DispatcherServlet, HandlerMapping, HandlerInterceptor, Handler, ModelAndView, ViewResolver, and View, while showing configuration examples and code snippets.
This article walks through the evolution from traditional Servlets to Spring MVC's DispatcherServlet, explaining how each component—Servlet, BaseServlet, DispatcherServlet, HandlerMapping, HandlerInterceptor, HandlerExecutionChain, ModelAndView, ViewResolver, and View—contributes to a cleaner, more modular server‑side architecture.
This article explains how Spring MVC evolved from basic Servlets to a two‑level controller architecture, detailing the roles of DispatcherServlet, HandlerMapping, HandlerInterceptor, ModelAndView, ViewResolver and View, and shows configuration examples that simplify server‑side development in Java web applications.
This comprehensive guide explains Spring MVC's MVC architecture, key components like DispatcherServlet and HandlerMapping, request processing flow, transaction management options, and essential annotations such as @Controller, @RequestMapping, @Autowired, and @Transactional, providing Java web developers with a clear, practical overview.
This article explains how the @ControllerAdvice annotation is discovered and utilized within Spring MVC, detailing the initialization process, the caching of @ExceptionHandler, @ModelAttribute, and @InitBinder methods, and how these global configurations are applied by RequestMappingHandlerAdapter during request handling.
This article presents a cinema ticketing system built with the SSM framework, MySQL, Redis, Alipay sandbox, LayUI, and Baidu ECharts, highlighting its architecture, features such as payment and seat selection, and providing source code link and screenshots.
The article explains how to replace a traditional Spring MVC‑based REST RPC framework with a transparent RPC model by extending DispatcherServlet, HandlerMapping, and HandlerAdapter, providing implicit service contracts, simplified client interfaces, and code examples for registration and request handling.
The article argues that Spring MVC remains a mainstream Java web framework but explores how the rise of reactive programming and Spring WebFlux reshapes its relevance, highlighting the shift toward front‑back separation, @RestController usage, and the broader Reactive Revolution in web development.
This article explains the concept of streaming queries, introduces MyBatis's Cursor interface, demonstrates common pitfalls with closed connections, and provides three practical solutions—using SqlSessionFactory, TransactionTemplate, or @Transactional—to safely perform large‑scale data retrieval in Spring applications.
This article explains the concept of streaming queries, introduces MyBatis's Cursor interface, demonstrates common pitfalls when the database connection closes prematurely, and provides three practical solutions—using SqlSessionFactory, TransactionTemplate, or @Transactional—to keep the connection open for efficient data retrieval.
This article explains how to design a non‑intrusive unified JSON response structure for Spring MVC applications, defines the standard JSON schema, provides Java enums and generic Result classes, demonstrates usage with @ResponseResultBody and @RestControllerAdvice, and shows comprehensive exception handling techniques.
This article presents fourteen practical techniques for creating Spring MVC controller classes, covering annotation-based definitions, interface implementation, extending abstract controllers, URL mapping, HTTP method specification, request parameter binding, model and view handling, redirects, form validation, file uploads, dependency injection, request/response access, and adherence to the single‑responsibility principle.
This article explains how Spring MVC works by walking through a simple SSM project, showing the controller implementation, configuration files, deployment steps, and then detailing the ten-step request‑handling flow from DispatcherServlet to the final view rendering.
This article presents fourteen practical techniques for writing Spring MVC controllers, covering annotation‑based definitions, interface implementation, abstract class extension, URL mapping, HTTP method handling, request parameter binding, model‑view returns, redirects, form validation, file uploads, dependency injection, servlet access, and single‑responsibility design, all illustrated with clear Java code examples.
This article demonstrates how to implement pagination and search pagination in a Java web project using Spring MVC, MyBatis, and standard pagination utilities, covering the creation of a Page utility class, MyBatis mapper configurations, DAO interfaces, service methods, controller handling, and JSP view integration.
This article walks through creating a lightweight Spring MVC‑like framework by setting up a clean web project, defining custom annotations, implementing a DispatcherServlet that scans packages, instantiates beans, performs dependency injection, maps URLs to controller methods, and finally runs the application without any Spring dependencies.
This guide walks through building a Spring MVC backend that accepts multiple image uploads, returns them for preview, and covers front‑end HTML, JavaScript handling, multipart configuration, and common pitfalls such as parameter naming, file size limits, and global exception handling.
This article introduces Spring MVC, explains the problems of mixing JSP and Servlets, details the MVC layered architecture, walks through essential configuration files and Maven dependencies, presents sample controller code, and analyzes the DispatcherServlet source to illustrate the complete request‑response flow in a Java web application.
This article provides a detailed overview of common Spring Boot, Spring MVC, and JPA annotations—including @SpringBootApplication, @RestController, @RequestMapping, and JPA mapping annotations—explaining their purposes, usage patterns, and example code snippets for building Java backend applications.
This article explains Apache Shiro's core architecture, demonstrates how to create authentication tokens, configure realms with caching and hashing, and shows step‑by‑step integration with Spring MVC including filter setup and login controller code.
This article walks through the complete Spring MVC request handling flow, from setting request attributes and locating the handler to executing interceptors, invoking the controller, resolving the view, and finally rendering the response, with detailed code examples for each step.
This article explains the Adapter design pattern, illustrates its real‑world analogies, describes object and class adapter variants, provides complete Java code examples, demonstrates a voltage‑conversion demo, and shows how Spring MVC employs adapters to decouple controllers from request handling.
This article explains Apache Shiro's security architecture, demonstrates how to create authentication tokens, configure realms, use caching and hashing for password protection, and integrate Shiro with Spring MVC through XML and Java code examples.
Using the open‑source Arthas tool, the author traced a Java server’s 99 % CPU usage to two runaway threads, inspected their stack traces, discovered a cyclic bucket in a HashBiMap caused by unsynchronized cache updates, and resolved the issue by adding a synchronized keyword to the cache‑sync method.
This article extends the previous introduction to Spring MVC functional interfaces by demonstrating how to handle exceptions, apply filters, implement before/after interceptors, and achieve unified routing and error handling using functional programming style in Java.
This article explains the design principles of Spring MVC interceptors, introduces the key interfaces and classes involved, demonstrates how they are wired within the framework, and provides step‑by‑step guidance for configuring and implementing custom interceptors in a Java web application.
In Spring MVC, the default data format returned by @ResponseBody depends on the client’s Accept header, and the framework selects an appropriate HttpMessageConverter through RequestResponseBodyMethodProcessor, which evaluates acceptable and producible media types to produce JSON, XML, or other formats.
This article provides a detailed overview of common Spring Boot, Spring MVC, and JPA annotations—including their purposes, usage patterns, and code examples—helping developers understand how to configure, map, and manage beans, controllers, and persistence in Java backend applications.
This article provides a comprehensive overview of Spring Boot, Spring MVC, and JPA annotations, explaining their purposes, usage, and interactions, and includes practical code examples for each annotation to help developers quickly apply them in real projects.
The article examines common misuse of base Controller and Service classes in Java micro‑service projects, explains why they violate design principles such as Liskov Substitution, and provides concrete refactoring steps—including moving injections, constants, and utility methods to appropriate layers—to achieve a clean three‑tier architecture.
This article presents fourteen practical techniques for building Spring MVC controllers, covering annotation usage, interface implementation, abstract class extension, URL mapping, HTTP method specification, request parameter binding, model handling, redirects, form processing, file uploads, dependency injection, servlet access, and single‑responsibility design.
This article provides a comprehensive overview of Spring Boot, Spring MVC, and JPA annotations, explaining their purposes, usage patterns, and example code snippets, while also covering global exception handling with @ControllerAdvice and @ExceptionHandler for robust backend development.
This tutorial explains why QR codes are everywhere, introduces their basic properties, and shows how to generate static and dynamic QR codes in Java using the ZXing library, Maven dependencies, Spring MVC, and optional Base64 streaming for front‑end display.
This article explains the distinctions between Spring, Spring MVC, and Spring Boot, illustrates how Spring Boot achieves automatic configuration through annotations like @SpringBootApplication, @EnableAutoConfiguration, and @ComponentScan, and provides detailed code examples of the underlying mechanisms and related configuration classes.
This article explains the Ant‑style path matching syntax, its wildcards ?, *, **, the longest‑match rule, and demonstrates how to apply these patterns in Spring MVC controller mappings and Spring Security antMatchers for precise URI access control.
This tutorial walks you through Spring Boot 2.x fundamentals, explaining core MVC annotations, defining a User entity with Lombok, creating a full RESTful CRUD controller, and writing comprehensive MockMvc unit tests to verify each endpoint.
Spring, Spring MVC, Spring Boot, and Spring Cloud are Java frameworks that respectively provide core IoC/AOP functionality, web MVC capabilities, convention‑over‑configuration rapid development, and comprehensive microservice governance, together forming a layered ecosystem for building clean, manageable, and scalable backend applications.
This article explains the HTTP Content-Type header, outlines common media type values, and demonstrates how Spring MVC's RequestMapping annotation uses the consumes and produces attributes to filter requests and responses based on Content-Type, including practical code examples.
The article explains how Server‑Sent Events (SSE) provide a lightweight, one‑way server‑to‑client push mechanism that avoids the complexity of WebSocket or polling, shows its protocol details, compares it with WebSocket, and demonstrates integration with Spring MVC and the browser EventSource API.
This article provides a detailed overview of the most commonly used Spring MVC request‑mapping annotations, Spring Bean stereotypes, dependency‑injection and scope annotations, container configuration annotations such as @Autowired and @Primary, and essential Spring Boot annotations, illustrating each with clear code examples and diagrams.
This article provides a comprehensive guide to essential Spring annotations—including @Controller, @RestController, @Service, @Autowired, @RequestMapping, @ModelAttribute, @Cacheable, @CacheEvict, @Resource, @PostConstruct, @PreDestroy, @Repository, @Component, @Scope, @SessionAttributes, @Required and @Qualifier—explaining their purposes, usage patterns, and practical examples with accompanying diagrams.
This guide explains how to handle date and time parameters in Spring MVC by using @DateTimeFormat for request‑level conversion, configuring global formatters via WebMvcAutoConfiguration, and implementing custom Converter, GenericConverter, and Formatter beans to ensure seamless ISO‑8601 parsing.
This article provides a comprehensive overview of the Spring framework, Spring MVC, and Spring Boot, explaining how dependency injection reduces boilerplate and enables loose coupling, illustrating code examples with and without DI, and describing Spring Boot’s auto‑configuration, starter projects and typical starter options for building modern Java backend applications.
This article explains the differences between JSP and Servlets, lists JSP built‑in objects and scopes, compares Session and Cookie mechanisms, describes session operation and alternatives when cookies are disabled, contrasts Spring MVC with Struts, and outlines common web security measures such as preventing SQL injection, XSS, and CSRF attacks.
The article explains the evolution from classic three‑tier Java web architecture to cluster, distributed, and microservice designs, detailing each model’s components, load‑balancing mechanisms, session sharing, and the trade‑offs of using technologies such as Tomcat, Nginx, Dubbo, and Spring Cloud.
This tutorial demonstrates how to configure Spring MVC in a Java web project by modifying web.xml, creating DispatcherServlet, implementing controllers and DTOs, setting up JSP pages with Bootstrap, handling JSTL date formatting using custom tags for Java 8 LocalDateTime, and integrating modular JavaScript for a seckill (flash sale) application.
This article explains the purpose and usage of frequently used Spring annotations such as @Controller, @RestController, @Service, @Autowired, @RequestMapping, @RequestParam, @ModelAttribute, @Cacheable, @CacheEvict, @Resource, @PostConstruct, @PreDestroy, @Repository, @Component, @Scope, @SessionAttributes, and @Qualifier, providing code examples and practical notes for Java backend development.
This article walks through the Spring MVC request handling pipeline step by step, explaining how DispatcherServlet sets attributes, resolves handlers, invokes handler adapters, runs pre‑ and post‑interceptors, creates ModelAndView, resolves the view and finally renders the response, with code examples from the original framework.
This article explains how Spring Boot, Spring, and Spring MVC relate to each other, describes Spring MVC's core concepts, and details Spring Boot's auto‑configuration, static resource handling, error handling, CORS support, and related code examples for building Java backend applications.
This article compiles common interview questions and concise answers about Spring, Spring MVC, and MyBatis, covering core concepts such as IoC, AOP, transaction management, controller behavior, annotation usage, design patterns, MyBatis configuration, mapping techniques, pagination, and integration with Ajax.
This article explains the MVC pattern and provides a detailed introduction to Spring MVC, covering its core DispatcherServlet, required web.xml configuration, request processing flow, key components such as HandlerMapping, HandlerAdapter, ViewResolver, and includes code examples and component descriptions for backend developers.
