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Technical Articles

Java

javaTutorial

Best practices for returning UI field properties in server JSON response

This article explores best practices for returning UI field properties (such as mandatory, editable, disabled, etc.) in server JSON responses. The core point is that although it is reasonable to return a value value from the server, decisions for other attributes should be based on considerations of the complexity of the business logic and the division of front-end responsibilities. The server-side control part of the business logic can simplify the front-end, but may increase the complexity of the server; the front-end control is more flexible, but data consistency needs to be considered. The article analyzes the pros and cons and mentions the practice of the relevant REST framework, providing developers with a reference for decision-making.

Aug 16, 2025 pm 01:24 PM

Judge right triangles in Java: No need to modify the side length processing techniques of arrays

This article introduces in detail how to determine whether a triangle with a given three-side length is a right triangle in Java. The core method is to first find the longest edge in the array as the oblique edge, then iterate through the array, accumulate the squares of the other two edges except the longest edge, and finally compare the accumulation result with the square of the longest edge. This solution does not require modifying the original array or introducing external libraries, effectively solving the challenge of handling array elements in specific environments (such as Replit restrictions).

Aug 16, 2025 pm 01:06 PM

How to connect a Spring Boot application to a database

Add correct dependencies, such as spring-boot-starter-data-jpa and the corresponding database driver; 2. Configure database connection information in application.properties, including URL, username, password and JPA attributes; 3. Create entity class mapping database tables with @Entity annotation; 4. Create an interface that inherits JpaRepository as the data access layer; 5. Inject Repository into Service or Controller and call its methods to operate the database; After completing these steps, SpringBoot will automatically configure the data source, entity manager and transaction management to realize database connection and

Aug 16, 2025 pm 12:49 PM

Android ImageView based on anchor scaling implementation

This article describes how to implement ImageView's scaling function based on four corner anchor points in Android applications. By listening to touch events, calculate the distance between the touch point and the center point of the ImageView, and dynamically adjust the scaling ratio of the ImageView according to the distance changes, thereby realizing the effect of dragging the anchor point for scaling. The article provides detailed code examples to help developers understand and implement this feature.

Aug 16, 2025 pm 12:36 PM

How to work with text blocks in Java

TextblocksinJavaaremultilinestringliteralsenclosedbytripledoublequotes(""")thatsimplifyworkingwithstructuredtext.1.Theyeliminatetheneedforconcatenationandmostescapesequences,makingmultilinestringscleaner.2.TheyimprovereadabilityforHTML

Aug 16, 2025 pm 12:33 PM

Calculate checksum of hexadecimal strings: Java Implementation Tutorial

This article introduces how to calculate the checksum of hexadecimal strings in Java, with the focus on converting hexadecimal strings into byte arrays and provides two conversion methods. At the same time, the use of the CRC32 algorithm to calculate the checksum is discussed, and the difference between the checksum calculation results and the expected value is analyzed, and finally it is pointed out that more in-depth research may be required to find the correct solution.

Aug 16, 2025 pm 12:27 PM

Read AWS S3 objects from Spring Boot app and convert to object list

This article details how to read a text file containing JSON data from the S3 bucket through the AWS SDK in Spring Boot application, and convert each line of JSON data into Java objects, and finally get a list of objects. The article provides two implementation solutions, one reads the S3 file to the local file system and then processes it, and the other directly processes the S3 file contents in memory, and comes with complete code examples and configuration instructions to help developers quickly realize the functions of S3 data reading and conversion.

Aug 16, 2025 pm 12:24 PM

How to run a command line command from Java

Use Runtime.exec() to execute external commands, but string arrays need to be used to avoid space problems; 2. It is recommended to use ProcessBuilder because it is more flexible, and can set environment variables, working directories and clear syntax; 3. You should read stdout and stderr at the same time and process input and output streams; 4. Avoid command injection and properly handle exceptions and stream closures; 5. Pay attention to the platform dependence of commands, and new code should give priority to using ProcessBuilder to ensure security and maintainability.

Aug 16, 2025 am 11:52 AM

java Command Line

Read a list of JSON objects from AWS S3 using Spring Boot

This article describes how to use Spring Boot and AWS SDK to read files containing multiple JSON lines from an S3 bucket and parse each line into a Java object, ultimately storing all objects in a list. The article provides two implementations, demonstrating the solution to read S3 files to the local file system and process them directly in memory, and comes with a complete code example and configuration description.

Aug 16, 2025 am 11:48 AM

How to merge the method to find the maximum and minimum values of an array using Comparator

This article aims to explain how to combine two similar methods that look for array maximum and minimum values into a more general method by using the Comparator interface. By passing different Comparator implementations, you can flexibly control the comparison logic, thereby finding the "maximum" under maximum values, minimum values, or other custom comparison rules. This article will provide detailed code examples and explanations to help readers understand and apply this approach.

Aug 16, 2025 am 11:42 AM

Troubleshooting and solving problems that cannot use alphanumeric mixed queries

This article aims to solve the problem that searches cannot be done with alphanumeric mixed code in Elasticsearch. By analyzing index configuration and query statements, find out the reasons why numbers cannot be matched correctly, and provide suggestions for modifying index configuration and query methods to achieve effective search of alphanumeric mixed code. This article will dig into the role of word participle and provide guidance on selecting the right word participle to ensure Elasticsearch can correctly handle alphanumeric blending data.

Aug 16, 2025 am 11:27 AM

BigDecimal's empty security Comparator implementation tutorial

This article aims to solve how to deal with possible null pointer exceptions when using Comparator in Java to sort a list of objects containing the BigDecimal type. By providing specific code examples, we explain in detail how to create and use an empty-safe BigDecimal comparator to ensure the stability and reliability of the sorting process and avoid program crashes caused by null values.

Aug 16, 2025 am 11:24 AM

Diagnosis and solution of requested character encoding problems in Spring Boot application

This article aims to explore in-depth character encoding issues that Spring Boot applications may encounter when handling non-UTF-8 requests. We will reveal the root cause of the inconsistency between the charset declaration in the Content-Type header and the actual request body data encoding by analyzing a typical garbled case. The article will provide the correct test method and explain the mechanism of Spring Boot to handle character encoding. At the same time, it will provide strategies and best practices for dealing with multi-character encoding requests in actual projects, helping developers build robust microservices.

Aug 16, 2025 am 11:21 AM

Modify the value of final field in Java 17 using reflection

This article describes the correct way to modify non-static final field values using reflection in Java 17. Due to the security restrictions brought by Java version updates, the traditional way of modifying modifiers fields has become invalid. This article will provide a VarHandle-based solution and details the required JVM startup parameters to help developers bypass these limitations if necessary.

Aug 16, 2025 am 11:12 AM