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 […]

React technical principles and code development practice: React form processing and verification

1. Background Introduction Currently, front-end technology is changing with each passing day, and new technologies are emerging one after another. React, as the most popular Javascript library at the moment, is increasingly favored by developers. React is known as “the Facebook of JavaScript”. Its advantages include componentization, declarative programming, JSX syntax, etc., and React Hooks […]

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 […]

MATLAB connects to the MYSQL database and performs addition and deletion operations

I recently built an experiment management system. The new UI interface of matlab is relatively interactive and user-friendly. I am new to mysql and have never touched a database before, so I will make a record. 1. Environment installation 1. Make sure that matlab has database toolbox installed, which can be queried through the ver […]

Use the Stream stream to convert the obtained object List<Object>form data into Map<Grouping conditions, quantity statistics>form

For example, the current business needs to group the obtained data, and then use another method to process the data. The methods used are Collectors.groupingBy, Collectors.counting(), Collectors.reducing(). Then, take the following example as an example to collect the obtained lists and group the obtained data by gender, with gender as K and the number of […]

TrOCR model fine-tuning [Transformer-based optical character recognition]

The TrOCR (Transformer-based Optical Character Recognition) model is one of the best performing OCR models. In our previous article we analyzed their performance on single lines of printed and handwritten text. However, like any other deep learning model, they have their limitations. TrOCR doesn’t perform well with curved text out of the box. This article […]