java implementation of AES encryption algorithm

Reprinted from: https://blog.csdn.net/zyhlwzy/article/details/77948165 AES encryption algorithm is an advanced encryption standard in cryptography. The encryption algorithm adopts symmetric block cipher system. The minimum key length is 128, 192, 256, and the block length is 128 bits. The algorithm shou ...

Posted on Fri, 18 Oct 2019 08:04:11 -0700 by Nuv

Using Python to easily compress pictures in batches

In the Internet, the size of the image has a significant impact on the response speed of a website, so when providing user preview, the image is often compressed. If a website has many pictures, it is obviously a waste of time to compress one by one. So next, I'll share a method of compressing pictures in batches with you. With just a few lines ...

Posted on Fri, 18 Oct 2019 07:06:14 -0700 by rocketsprocket

Small fish swimming in canvas's drawImage application

This is an application of canvas's drawImage method to picturesdrawImage(obj,sx,sy,sw,sh,dx,dy,dw,dh) There are 9 parameters in the method. The first parameter is explained by MDN. The element drawn to the context. Allow any canvas image source( CanvasImageSource )For example: CSSImageValue,HTMLImageElement To manipulate the layout and image o ...

Posted on Fri, 18 Oct 2019 04:07:35 -0700 by Darkness31

Practical course of iota hardware integration

This tutorial is for the beginners of iota. We will learn how to develop a relay connected to raspberry pie based on the balance of the specified iota address to turn on or off the LED. Although the tutorial is simple, it is enough to demonstrate the powerful capabilities of iota. We will use a connected raspberry pie as the Internet of things ...

Posted on Fri, 18 Oct 2019 02:53:52 -0700 by Timsoft

N scenarios and n methods of realizing vertical center in css

The elements of inline or inline - * are vertically centered You can use padding, line height, vertical align and other attributes. There are two specific scenarios as follows: To center a single line vertically, as of text or links. In this case, the vertical center can be achieved by adding the same size padding value to the top and bottom ...

Posted on Fri, 18 Oct 2019 02:50:39 -0700 by lostsoul111455

Django generates PDF documents to display on the web page and solves the problem of PDF Chinese display garbled

In this demo, users input their personal information to generate a resume PDF, which explains how to use Django's HttpResponse to generate PDF documents. First on the renderings:   Install dependency Library Install Django's latest version 2.2.2 and PDF dependency package xhtml2pdf first pip install django pip install xhtml2pdf W ...

Posted on Fri, 18 Oct 2019 02:49:15 -0700 by LightningSt

File upload and download of FTP server in Java

Preface Due to the business requirements, it is necessary to realize the file upload and download functions of ftp server. So I used apache's Toolkit commons net. It's very simple to use, but some details are quite poor, so it's explained here. Use The core tool class of the third-party package is FTPClient. Whether it is file upload or file do ...

Posted on Fri, 18 Oct 2019 01:59:54 -0700 by aiwebs

js transforms flat structure data into tree structure

Summary Recently, the project frequently needs to carry out tree transformation for flat structure. This algorithm has used recursion since I first contacted it, and now it is completed in a single cycle. Simply record the evolution of the algorithm. Recursive implementation function transformTree (list) { const tree = [] for (let ...

Posted on Fri, 18 Oct 2019 01:12:32 -0700 by php12342005

VBA implementation adds comments to cells with custom names in Excel

I. realize this demand by creating macro in local office 1. Open an Excel file, right-click the cell to be annotated (myTable1). Click menu bar view macro view macro enter macro name create macro         ​ 2. Enter the VBA editing interface, copy - save - close the VBA interface. Sub addComment()       ActiveSheet.Application.Sheets("Sheet ...

Posted on Fri, 18 Oct 2019 00:02:18 -0700 by Mhz2020

Using Go to process Middleware

brief introduction Middleware of gin Create Middleware summary Code of current part brief introduction When developing web applications, many places need to use middleware to uniformly handle some tasks.Such as logging, login verification, etc. gin also provides middleware functions. Middleware of gin At the beginning of project creation, som ...

Posted on Thu, 17 Oct 2019 22:25:17 -0700 by SCRUBBIE1