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The design principle is a summary of some experience guiding our code design, that is, "mental method"; Object oriented is our "weapon"; Design pattern is "move". Based on mental skill, use weapon moves to deal with complex programming problems. Cousin: brother, I read the news today that the EU has expanded s ...

(1) Read the configuration file of MyBatis. mybatis-config.xml is the global configuration file of MyBatis, which is used to configure database connection information. (2) Load mapping file. The mapping file is the SQL mapping file, in which the SQL statements for operating the database are configured, which needs to be in the MyBatis config ...

annotation Annotation Introduction to annotation Can be read by other programsFormat: @ + annotation nameUsage: it can be attached to package, class, method, field, etc., which is equivalent to adding auxiliary information to access the content under the annotation through the reflection mechanism Built in annotation @Override: defined in ...

Decrypt wechat applet login authorization to obtain mobile phone number according to Official documents Wechat applet process: According to the interpretation of the official encryption data decryption algorithm: 1. The algorithm used for symmetric decryption is AES-128-CBC, and the data is PKCS#7 filled. 2. The target ciphertext of symme ...

Dynamic array implementation 1. Class structure The construction of all classes needs to be considered from two aspects: properties and methods. attribute To construct a dynamic array, we first need an array with uncertain size, and then determine the size of the array when calling its constructor. Secondly, some parameters about the array: ...

Network programming, WebSocket Foundation summary: Network globalization connects the world through the network. Connect through domain name (ip address) and port number. Real time interaction: when making a call, the technology used is TCP connection. Transmit information: send information. UDP connection is used. Computer network: ...

Multithreading tutorial (32) ThreadPoolExecutor 1. Thread pool status ThreadPoolExecutor uses the upper 3 bits of int to indicate the thread pool status and the lower 29 bits to indicate the number of threads Status nameHigh 3 bitsReceive new tasksProcessing blocking queue tasksexplainRUNNING111YYSHUTDOWN000NYNew tasks are not received, bu ...

Background analysis In microservices, the first problem we need to face is how to find services (software is a service), and the second is how to communicate between different services? How to manage every service in the application better and more conveniently, and how to establish the link between various services, so that the registration c ...

Since 2021, the self driving track has entered an explosive period, and the industry has become a battleground for large manufacturers and start-ups. Among them, many companies have adopted computer vision as the technical base of automatic driving. Through image segmentation technology, cars can effectively understand the road scene and distin ...

I General form of annotation injection Bean class public class TestBean{ } Configuration class @The Configuration annotation marks this class, which indicates that this class is a Spring Configuration class. It will be loaded when loading the Configuration. @The annotation of Bean indicates that this is a method of injecting Bean, which wi ...