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Cross-language ZIP compression and decompression: Best practices for Java generation and Go decompression

This article aims to resolve the "zlib: invalid header" error encountered when Go language decompresses data using ZipOutputStream after Java uses ZipOutputStream to compress data. The core problem is that it confuses the ZIP file format with the Zlib compression stream. The article will elaborate on the output characteristics of Java ZipOutputStream in detail, and provide professional solutions for correctly decompressing archive/zip packages in Go language to ensure compatibility and correctness of cross-language data transmission.

Aug 26, 2025 am 10:24 AM

Convert integers into small-endian hexadecimal representation and output formatting in Java

This tutorial details how to convert integers into a hexadecimal representation of Little Endian in Java. The article explains how to handle endianness using ByteBuffer and focuses on solving common symbol extension problems when correctly formatting Java's signed byte types into two-bit hexadecimal strings. Make sure the output is as expected by providing the correct printf formatting skills, such as converting integer 1234 to D2 04.

Aug 26, 2025 am 10:15 AM

Kafka Streams: Group based on keys and create global KTable with value as object list

This document describes how to use Kafka Streams to group data based on keys, such as Scheme, and store the results in a global KTable where the key is a string (Scheme) and a value is a RuleConfig object list. This is demonstrated through sample code, and points out key points to be paid attention to during implementation to ensure that KTable aggregates and stores data correctly.

Aug 26, 2025 am 10:03 AM

ISBN format output tutorial

This article describes how to format a 9-digit string into an ISBN format, such as 9-562-32458-4 or 0-321-57351-X. It is mainly achieved through the String.substring() method and the System.out.printf() method. At the same time, this article also emphasizes the importance of input verification to ensure that the input string length is 9 bits.

Aug 26, 2025 am 10:00 AM

Java console pattern generation: character alternating mode implementation based on user input

This article will introduce in detail how to implement a dynamic character pattern generator in Java. The program prints characters line by line based on the integer value entered by the user. The number of characters per line is the same as the line number, and characters will alternate between " " and "-" according to the parity of the line number. We will build this logic through nested loops and conditional judgments and provide complete Java code examples to help readers master such pattern generation techniques.

Aug 26, 2025 am 09:51 AM

Spring Boot Thymeleaf List Data and Operation Button Correct Integration Practice

This tutorial explains in detail how to efficiently and correctly render HTML tables containing list data in Spring Boot applications, and integrate independent operation buttons (such as deletion) for each row of data. From the backend data model design, controller data preparation, to the iterative rendering and form submission of the front-end Thymeleaf template, the article systematically solves the common loop nesting errors when adding operation buttons to each data in the table, ensuring that each row of data only corresponds to one operation button, which improves the clarity and maintainability of the code.

Aug 26, 2025 am 09:45 AM

Java tutorial: Find elements with the same number in the array

This article aims to describe how to write a method in Java that takes an array of integers as input and returns an array of elements with the same beginning and ending numbers. We will do this by converting numbers into strings and comparing the end characters of the string while avoiding repeated additions of elements.

Aug 26, 2025 am 09:30 AM

Practical Guide to Calculating Date and Time Differences in Java

This article aims to guide Java developers how to calculate the difference between two dates and times and determine whether they meet certain conditions. We will use the java.time package introduced by Java 8, especially the LocalDateTime and Duration classes, to calculate the time difference efficiently and accurately, and provide sample code to demonstrate how to calculate the minute difference between two LocalDateTime objects and compare it with the preset value.

Aug 26, 2025 am 09:24 AM

Java Caesar Password: How to properly handle and retain spaces in encrypted text

This tutorial explains in detail how to ensure that the encrypted text can retain spaces in the original message when implementing Caesar passwords in Java. By analyzing common errors, that is, simply skipping space characters, this article provides an accurate code modification solution, demonstrating how to explicitly add spaces to the result string during the encryption process, thereby achieving more expected encrypted output, improving the practicality and user experience of the encryption tool.

Aug 26, 2025 am 08:45 AM

Implement the client to run the server-side GUI application: JAR file download and execution strategy

This article details how to solve the problem of client running server-side GUI applications. The core strategy is that the client downloads the JAR file of the GUI application from the server and then executes the JAR file in the local environment. The tutorial will provide specific Java code examples, covering the steps of file download and process startup, and discuss related precautions to ensure that readers can implement this function safely and effectively.

Aug 26, 2025 am 08:36 AM

Using PostgreSQL as a Netbox database: Connection and Transaction Operation Guide

This article aims to describe the types of databases used by Netbox and how to connect to Netbox's PostgreSQL database through Java for transactional operations. We will explore how to configure connections, perform queries, and process transactions to ensure data consistency and reliability.

Aug 26, 2025 am 08:30 AM

Log4j 1.x migration to Log4j 2.x troubleshooting and resolving configuration errors

This document is intended to help developers resolve the error of The prefix "log4j:configuration" for element "log4j:configuration" is not bound. when migrating a Log4j 1.x project to Log4j 2.x. The article will introduce the cause of the error in detail and provide the correct Log4j 2.x configuration file examples to help developers complete the migration smoothly.

Aug 26, 2025 am 08:03 AM

Experience Java 19 preview features and incubation modules with Gradle

This article aims to guide developers on how to use Java 19's preview features and incubation modules such as virtual threading and structured concurrency in Gradle projects. By configuring the build.gradle file, adding compiler parameters and JVM parameters, these new features can be easily enabled and developed and tested in the Gradle environment. This article provides a workable example to help readers get started quickly.

Aug 26, 2025 am 07:39 AM

How to create a JAR file from the command line in Java

CompileJavasourcefilesinto.classfilesusingjavac.2.UsethejarcfcommandtocreateaJARfile.3.Includemultiplefilesordirectoriesbylistingthemorspecifyingtherootdirectoryofthepackagestructure.4.TomaketheJARexecutable,eitherusejarcfmmyapp.jarmanifest.txtcom/wi

Aug 26, 2025 am 07:36 AM