FlinkTransformation operator

After the data source reads the data, we can use various conversion operators to convert one or more DataStreams into new DataStreams. After the data source enters, we can convert the data source into the data format we need according to a series of transformation operators, and then output it. Basic conversion operators (map/ filter/ […]

Python generates a pair of RSA keys and saves the public and private keys as .pem files respectively. Use the public key in the generated RSA key pair to encrypt the data, and then use the private key to decrypt. Convert RSA’s public key exponent (E) and modulus (N) to .pem format

You can use the cryptography library to generate a pair of RSA keys and save the public and private keys as .pem files respectively. Here is a sample code: from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives import serialization from cryptography.hazmat.primitives.asymmetric import rsa # Generate RSA key pair private_key = rsa.generate_private_key( public_exponent=65537, key_size=2048, backend=default_backend() ) # Get […]

Design and implementation of information technology knowledge contest system based on SpringBoot

Table of Contents Preface 1. Technology stack 2. Introduction to system functions User information management Learn video management Announcement type management Announcement information management 3. Core code 1. Login module 2. File upload module 3. Code encapsulation 4. Conclusion Foreword Firstly, it takes a lot of time to manage information using traditional methods. Secondly, the […]

UI automation test framework design and PageObject transformation!

During the UI automation testing process, faced with complex business scenarios, we often encounter the following challenges: Simple recording/playback is fast, but cannot adapt to complex scenes; Writing automated test scripts is more flexible, but the workload is heavy and maintainability is poor; The previous encapsulation technology (PageObject) can adapt to various UI scenarios, but […]

Designing IIR digital filter using bilinear transformation method

1. Experimental purpose 1. Be familiar with the principles and methods of designing IIR digital filters using bilinear transformation method. 2. Master the computer simulation method of digital filters. 3. Obtain perceptual knowledge of digital filtering by observing the filtering effect on actual electrocardiogram signals. 2. Experimental content 1. Use bilinear transformation method to design […]

Windows enumerates device information

Enumeration of device information is mainly implemented through the interface in the SetupAPI module, in conjunction with the corresponding device class GUID. Here we take enumerating USB device information as an example, including device instance addresses, etc.: #include <stdio.h> #include <Windows.h> #include <SetupAPI.h> #pragma comment(lib, “SetupAPI.lib”) #include <devguid.h> // The specific device GUID requires initguid, […]

Node.js builds web server, interface configuration, parameter format and garbled code processing

Node.js Overview Node.js is not a new programming language, nor is it a JavaScript library, but a JavaScript running environment, and it is also the second running environment for JavaScript outside of the browser. We can run all the features of ES6 on node.js without worrying about any compatibility issues. In addition to its good […]