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Configure multiple Thymeleaf template resolvers in Spring Boot

This article describes how to use multiple SpringResourceTemplateResolvers in Spring Boot applications to handle Thymeleaf templates in different template directories. By configuring the priority and custom parser for the template parser, you can flexibly manage multiple template directories and ensure that Thymeleaf can correctly parse and render templates. This article provides a clear configuration example and points out how to disable cache during development for easy debugging.

Aug 20, 2025 am 11:33 AM

Java String Combination and Translation Tips: Avoid Null Value Traps

This article aims to solve the common null value problem when merging string arrays in Java. By analyzing the error's loop conditions and index usage, this tutorial will dig into the causes of merge failures and provide two clear and effective solutions. Through detailed code examples, we guide developers to correctly merge string arrays to ensure data integrity and avoid null values.

Aug 20, 2025 am 11:24 AM

How to use Selenium WebDriver to close ad windows in web pages

This tutorial is intended to help developers solve the problem that ad windows cannot be closed when using Selenium WebDriver for web automation testing. By switching to an iframe containing the ad window, performing a close operation, and then switching back to the main document, you can effectively solve this problem and ensure the smooth progress of subsequent operations.

Aug 20, 2025 am 11:21 AM

Spark: Remove columns from beans before writing to partition

This article describes how to dynamically remove unwanted columns according to different partition requirements when writing Bean objects to partitions using Spark. By using the beanDataset.select() method to select the columns you want before writing, you can flexibly handle various partition combinations, avoiding the creation of multiple bean classes, simplifying code and increasing efficiency. This article will provide specific code examples and discuss related precautions.

Aug 20, 2025 am 11:06 AM

Spring Boot's strategy and practices for handling non-UTF-8 request encoding

When Spring Boot applications need to be compatible with HTTP requests from traditional systems and adopt non-UTF-8 encoding (such as Windows-1252), garbled characters often occur. This article deeply analyzes the root causes of such problems, points out common test misunderstandings, and provides correct client simulation methods, emphasizing the importance of ensuring that the actual encoding of the request body is consistent with the Content-Type header declaration, so as to ensure that Spring Boot can correctly parse requests with different encodings.

Aug 20, 2025 am 11:00 AM

How to memory-map a file in Java?

Memory mapped files are implemented in Java through FileChannel's map() method. The specific steps are: 1. Use RandomAccessFile or FileInputStream to get FileChannel; 2. Call FileChannel's map() method, specify the mapping mode (such as READ_WRITE), the starting offset and size, and return the MappedByteBuffer; 3. Read and write operations through MappedByteBuffer, and the data will be mapped to virtual memory and may be written back to disk. This method is suitable for high-performance random access scenarios, but it is necessary to pay attention to resource release dependent on GC and 32-bit JVM address space

Aug 20, 2025 am 10:48 AM

java 文件映射

How do you reverse a string in Java?

Using StringBuilder.reverse() is the easiest and efficient method, suitable for most cases; 2. Using a loop to invert character by character can provide greater control; 3. Using double pointer swap to reduce memory overhead; 4. Recursive methods are prone to stack overflow, which is only suitable for academic learning; 5. Using Collections.reverse() is longer and has low performance; you should usually choose newStringBuilder(str).reverse().toString() because it is concise, fast and highly readable.

Aug 20, 2025 am 10:31 AM

java String reverse

How to extract a ZIP archive in Java?

Using ZipInputStream is a common method for decompressing ZIP files in Java. 1. First create the target directory; 2. Use ZipInputStream to read the ZIP file and process ZipEntry one by one; 3. Determine whether each entry is a directory. If so, create the corresponding folder. Otherwise, call extractFile to write the file content; 4. Use try-with-resources to ensure that the stream is closed correctly; 5. Pay attention to verifying the entry name to prevent path traversal attacks. This method is compatible and has fine control, and is suitable for most scenarios.

Aug 20, 2025 am 10:20 AM

Remove the first object instance of the specified class from Java ArrayList

This article describes how to remove the first object instance of the specified subclass T in Java's ArrayList. By using the instanceof keyword, the target object can be effectively identified and removed, avoiding inefficient ways to create new objects for comparison. At the same time, this article also discusses the possible problems that may exist when using the remove(Object o) method directly and provides a safer and more reliable solution.

Aug 20, 2025 am 10:06 AM

Mastering Java Streams API for Efficient Data Processing

The key to mastering JavaStreams API is to understand its core concepts and efficient usage methods: 1. Streams are not data structures, do not store elements, and can only be consumed once, and new streams need to be created for each processing; 2. Intermediate operations (such as filters, maps) are lazy, and terminal operations (such as collect, count) trigger actual calculations; 3. Priority is given to using primitive streams such as IntStream to avoid boxing overhead, and use parallelStream with caution, which is only enabled when large data volumes and CPU-intensive tasks; 4. Use Collectors to implement complex result processing such as grouping, partitioning, summary and string connection; 5. Flat-out nested structures using flatMap; 6. Encapsulation

Aug 20, 2025 am 09:58 AM

HC-05 Bluetooth and Android Multi-sensor Data Transmission and Analysis Practical Guide

This tutorial explains in detail how to use the HC-05 Bluetooth module to transmit data from multiple ultrasonic sensors to Android applications and realize independent display of data in different TextViews. The core strategies include the Arduino side using line breaks as packet separation, and the Android side ensuring the reception and parsing of complete messages through an efficient byte stream processing mechanism. The article will provide key code examples for Arduino and Android to guide readers to build a stable and reliable multi-channel sensor data communication system.

Aug 20, 2025 am 09:48 AM

How to convert a String to all lowercase in Java

To convert a string to lowercase, use the toLowerCase() method; 1. Directly call original.toLowerCase() to obtain a lowercase string; 2. To ensure cross-system consistency, locale should be specified, such as toLowerCase(Locale.ENGLISH); 3. When dealing with special languages (such as Turkish), you need to use the corresponding locale, such as toLowerCase(Locale.forLanguageTag("tr")); Since the string is immutable, the result must be assigned to a variable, and not specifying locale may cause unexpected behavior, so choose whether to specify lo according to your needs.

Aug 20, 2025 am 09:44 AM

Positioning runtime annotation processor: Tracking annotation processing logic using conditional breakpoints

This article aims to solve the challenge of the specific processing logic of running-time annotations (@Retention(RetentionPolicy.RUNTIME)) in large projects. When standard IDE tools cannot effectively reveal annotation processors, we will introduce an efficient debugging strategy. By setting breakpoints with specific conditions on the Java core API method Class.isAnnotationPresent(), developers can accurately track the code locations of reflective queries for specific annotations in third-party libraries or frameworks, thus revealing their underlying processing mechanism.

Aug 20, 2025 am 09:42 AM

Java vs Kotlin: Which JVM Language is Right for Your Next Project?

KotlinisthebetterchoiceformostnewJVM-basedprojects,especiallyAndroidapps,duetoitsconcisesyntax,built-innullsafety,coroutinesforasyncprogramming,andmodernlanguagefeaturesthatimprovedeveloperproductivityandcodemaintainability;1.Kotlinreducesboilerplate

Aug 20, 2025 am 09:37 AM