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Technical Articles

Java

javaTutorial

Implementing page redirection in Java Servlet: Avoiding the correct posture of 404 errors

This tutorial explains in detail the correct way to implement page redirection in Java Servlet applications, focusing on solving the problem of HTTP 404 Not Found errors due to improper use of paths. We will compare the usage of RequestDispatcher.forward() with HttpServletResponse.sendRedirect(), emphasizing the importance of using relative paths and request.getContextPath() in web applications, ensuring the stability and portability of page jumps.

Sep 09, 2025 pm 12:51 PM

Kafka Producer Performance Optimization: Achieve Million Message Throughput

This article aims to guide developers on how to optimize Kafka Producer to achieve millions of message throughput per second. By deeply profiling the key configuration parameters of Producer, such as linger.ms, batch.size, compression.type, acks and enable.idempotence, as well as Topic's configuration parameters min.insync.replicas, combined with actual code examples, help readers understand how to balance throughput and data consistency and ultimately achieve optimal performance.

Sep 09, 2025 pm 12:48 PM

Correct management and call of Toast messages in non-Activity classes of Android

This article aims to solve the type mismatch problem encountered when calling Toast messages in Android non-Activity classes. By elaborating on the requirements of the Toast.makeText() method for Context parameters, and providing a solution to correctly pass the Activity Context to static tool methods, centralized management and reuse of Toast messages are realized, thereby improving the robustness and maintainability of the code.

Sep 09, 2025 pm 12:45 PM

Java Concurrent Database Operations and Synchronization: A Practical Guide to Improve Performance

This article aims to explore how Java can effectively perform database operations in high concurrency environments, especially for reading, computing, and updating large amounts of data (such as million levels). We will conduct in-depth research on how to utilize thread pools, database connection pools, and the transaction and lock mechanisms of the database itself to achieve efficient and secure concurrent database access and avoid data competition and performance bottlenecks.

Sep 09, 2025 pm 12:39 PM

Android development: Efficient management of Toast tips in non-Activity classes

This article will guide Android developers how to manage and display Toast messages in non-Activity classes. By passing the Context as a parameter to the static auxiliary method, it can avoid duplicate code and realize centralization of Toast logic. At the same time, it solves common errors in directly passing Class type parameters, ensuring the flexibility and maintainability of application message prompts.

Sep 09, 2025 pm 12:36 PM

Implementing Java-style MD5 hashing in C#: A practical tutorial

This article aims to provide a detailed guide to correctly porting MD5 hash logic in Java to a C# environment. We will explore in-depth how Java MessageDigest is used, and compare and analyze the correct implementation methods of the System.Security.Cryptography.MD5 class in C#, including hash calculation, byte array processing, and key hexadecimal string formatting techniques, avoid common algorithm selection and conversion errors, and ensure consistency of cross-language hash results.

Sep 09, 2025 pm 12:33 PM

Optimize message prompt logic in Java collection traversal update

This article explores common problems in how to correctly handle operation result message prompts when traversing collections in Java for data updates. By analyzing the disadvantages of directly judging and outputting messages within the loop, a solution to using Boolean flags to uniformly manage update status is proposed and demonstrated in detail, ensuring that in multiple data update scenarios, the operation results can be accurately reported to the user, avoid unnecessary duplication or error messages, and at the same time, an optimization strategy for single matching scenarios is provided.

Sep 09, 2025 pm 12:09 PM

Protecting REST API with External Authorization Server in C# .NET: A Minimalist Configuration Guide

This article aims to provide a concise tutorial on using an external authorization server to protect the REST API in C# .NET. By configuring JWT Bearer authentication and authorization middleware, developers can implement a pure resource server that requires only a small amount of code to verify incoming access tokens, ensuring the security of API endpoints without complex custom user management logic.

Sep 09, 2025 pm 12:00 PM

Use Gin module to inject static configuration into GWT client

This article introduces the correct way to inject configuration values ??into GWT client code to avoid problems caused by using Guice directly. This highlights how to use AbstractGinModule to bind static values ??and obtain dynamic configuration from the server through GWT RPC to achieve flexible management of client configuration.

Sep 09, 2025 am 11:30 AM

In-depth analysis of java -jar command: avoid wildcard traps and solutions

When executing the java -jar *.jar command, you often encounter "Error: Unable to access jarfile .jar" error. This article will dig into the reason for this error, that is, the java -jar parameter does not directly support wildcard extensions and provides the correct solution: always explicitly specify the full name of the JAR file instead of using the `wildcard character to ensure that the Java virtual machine can accurately find and load the target application.

Sep 09, 2025 am 11:24 AM

String reorganization based on number sorting: Java regular expressions and Stream API practice

This article details how to reorganize strings containing numbers in numeric order using Java's regular expressions and Stream API. By splitting the string into word-number pairs, and then using the sorting characteristics of TreeMap, we finally realize the order of words in ascending order and connecting words to generate the target string. The tutorial will parse the code step by step and provide key points to note.

Sep 09, 2025 am 11:18 AM

RESTful API Multi-Query Parameter Processing Strategy: DTO and Map Practical Guide

This article discusses two efficient strategies for receiving and processing multi-query parameters in the RESTful API: encapsulating parameters using a custom data transfer object (DTO) to simplify controller method signatures; and flexibly receiving dynamic or large number of query parameters using Map structure. At the same time, the article emphasizes the importance of using JWT and other security authentication mechanisms when processing sensitive information, and provides specific code examples and best practice suggestions.

Sep 09, 2025 am 11:06 AM

Android Plurals Guide

This article aims to explain in detail the correct usage of Plurals in Android and avoid common wrong usage. With sample code and considerations, help developers understand how to use Plurals to implement multilingual support for applications, thereby improving user experience. This article will focus on how to define and use Plurals resources and correctly display singular and plural forms in different locales.

Sep 09, 2025 am 11:03 AM

Share app images to Adobe Lightroom Android

This article will introduce how to use Kotlin code in Android applications to share images directly to Adobe Lightroom mobile version. By using the Intent.ACTION_SEND action and specifying the package name of Lightroom, image delivery between applications can be realized, making it easier for users to edit and process in Lightroom.

Sep 09, 2025 am 10:54 AM