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Doctors in Spring Boot-Patient Relationship and Permission Management Practice

This article discusses effective strategies for managing doctor-patient relationships and their authority control in Spring Boot applications. For multi-role users and complex business relationships, the article compares multiple data models in detail and recommends a hybrid solution that combines common user authentication and specific role data separation. Through clear physical design, JPA annotation application and security considerations, we aim to provide a solution that is clear, easy to scale and meets actual business needs.

Aug 20, 2025 pm 12:54 PM

Loading GLSL Shader in Vulkan using Java

This document describes how to load and use GLSL shaders using the Vulkan API in Java. Compile GLSL shader into SPIR-V binary files through ShaderSPIRVUtils tool, and provides a GitHub tutorial link to help developers get started quickly and realize shader integration in the Vulkan pipeline.

Aug 20, 2025 pm 12:48 PM

Architecting a Multi-Tenant SaaS Application in Java

Chooseamulti-tenantstrategysuchassharedschema,schema-per-tenant,ordedicateddatabasebasedonisolation,cost,andscalabilityneeds;2.Identifytenantsearlyusinghostheader,JWT,orcustomheadersviaafilterinSpringBootandstoretenantcontextinThreadLocal;3.Implement

Aug 20, 2025 pm 12:46 PM

Mapping strategy in Spring JDBC that handles inconsistent Bean attributes and database column names

This article aims to solve the problem that Spring JDBC BeanPropertyRowMapper cannot automatically map when Java Bean property names are inconsistent with database column names. When non-JPA entity classes encounter such a situation, the annotation such as @Column cannot take effect. The core solution is to implement a custom RowMapper interface that accurately maps data by manually specifying column names, ensuring that the data can be correctly populated from the ResultSet into a Java Bean object.

Aug 20, 2025 pm 12:45 PM

Automate the mount and formatting of EBS volumes for AWS Windows EC2 instances

This article details how to use the cfn-init function of AWS CloudFormation, combined with PowerShell scripts to achieve automated mount and formatting of newly added EBS volumes on AWS Windows EC2 instances. The content covers rapid configuration methods for single block EBS volumes, as well as dynamic identification strategies for handling multiple blocks or uncertain drive letter EBS volumes, and provides best practices and considerations for integrating into CloudFormation templates, aiming to help users efficiently and reliably manage storage expansion of EC2 instances.

Aug 20, 2025 pm 12:42 PM

Log4j2 JsonTemplateLayout Stack Trace Pollution Problems and Solutions

When using Log4j2's JsonTemplateLayout, if configured improperly, the stack trace of the exception may unexpectedly be attached to other JSON fields, especially those using the pattern parser. This is because JsonTemplateLayout delegates to PatternLayout when processing the pattern parser, and PatternLayout enables stackTraceEnabled by default. The solution to this problem is to explicitly set stackTraceEnabled: false in each affected pattern parser configuration

Aug 20, 2025 pm 12:39 PM

How to use System.out.println in Java

System.out.println is the core method used in Java to output and break lines to the console. 1. It consists of System class, out static members and println() method; 2. It can print strings, variables, expressions, numbers and objects, etc.; 3. It does not need to import the java.lang package when using it; 4. Println() automatically wraps lines, if you do not need to break lines, print() should be used; 5. It is automatically called toString() method when printing objects. It is recommended to rewrite this method to obtain meaningful output; 6. Be careful to avoid missing brackets, semicolons or using uninitialized variables, and printing null values will output "null" without an error; this side

Aug 20, 2025 pm 12:37 PM

Android in-app HTTP server: AlertDialog interaction and response processing

This document describes how to deploy an HTTP server within an Android application and interact with the user via AlertDialog when requests are received. By listening to the button click event of AlertDialog, the server can send a response to the client according to the user's choice. At the same time, a simple blocking method is provided to ensure that the user interaction is completed before sending a response, and the potential performance impact is discussed.

Aug 20, 2025 pm 12:36 PM

How to write a Java program that prompts the user to enter until the condition is met

This article aims to guide developers to write a Java program that is able to loop through the user to enter a number between 30 and 70 until the user enters a value that satisfies the condition. We will explain in detail how to use while loops and Scanner classes to implement this function, and provide sample code and precautions to help readers understand and master the way to write the program.

Aug 20, 2025 pm 12:30 PM

Generate titles that accurately express the subject of the article Use the Try-Catch block in a loop: Ensure the program continues to run

This article explores the correct way to use try-catch blocks in loop structures (especially for loops). By placing the try-catch block inside the loop, the program can catch and handle the exception even if an exception occurs in a certain iteration, thus ensuring that the rest of the loop continues to execute and avoiding the program being interrupted by the exception. This article will explain this method in detail through sample code and provide considerations in practical applications.

Aug 20, 2025 pm 12:21 PM

Kotlin/Native and JVM hybrid deployment: a guide to implementing performance optimization and cross-platform compatibility

This article discusses how to cleverly combine Kotlin/Native compiled native executable files with pure JVM implementation in Java/JVM applications to balance the ultimate performance and extensive cross-platform compatibility. The core strategy is to use Java Native Interface (JNI) as a bridge to load and call the dynamic libraries generated by Kotlin/Native based on the platform at runtime, and elegantly fall back to the JVM code when the native library is unavailable, thus achieving acceleration of performance-sensitive modules and wide applicability of applications.

Aug 20, 2025 pm 12:03 PM

What is the difference between forward and redirect in Java servlets?

Forwardisusedforinternalserver-sidetransferswithoutchangingthebrowserURL,allowingrequestattributesharingandbetterperformance,idealforpreprocessingbeforeJSPrendering;1.Forwardkeepsthesamerequestandresponse,2.ItdoesnotupdatethebrowserURL,3.Datacanbepas

Aug 20, 2025 am 11:45 AM

servlet 轉(zhuǎn)發(fā)與重定向

Generation and processing strategies for data arrangement in Java

This article aims to explore how to effectively generate all possible permutations in Java and process each independent permutation one by one. We will use a classic "hiring assistant" problem as a case to elaborate on how to fix the normal error of flattening all arrangements, ensuring that each arrangement can be passed as an independent input to the processing function, so as to achieve correct statistics and analysis, and finally calculate the probability under specific conditions.

Aug 20, 2025 am 11:39 AM

How to find matching elements using Java Stream and handle existing or not gracefully

This article explores in-depth efficient ways to find specific elements in a collection using the Stream API in Java, and highlights how to gracefully handle both situations where elements exist or do not exist. By comparing the evolution of traditional loops and Stream, we elaborated on the joint application of core operators such as filter(), findFirst() and ifPresentOrElse() in detail, providing clear code examples and professional parsing, aiming to help developers write streaming code with cleaner and more complete functions.

Aug 20, 2025 am 11:36 AM