Programmer Think

1. Brief introduction DES, which is called Data Encryption Standard, is a block algorithm using key encryption. It is a symmetric encryption algorithm, the so-called symmetric encryption algorithm is: encryption and decryption using the same key algorithm. 2. Model Analysis Messaging goes through the following steps: (1) The key is agreed u ...

Common orders cobbler check checks cobbler configuration The cobbler list lists all the cobbler elements cobbler report lists the details of the elements cobbler distro to view imported distribution system information cobbler system Views Additional System Information cobbler profile view configuration information cobbler sync synchro ...

Contents of this article: 1.1 PXE Description 1.2 PXE process 1.3 Deployment Environment Description 1.4 Deployment of DHCP services 1.5 Deployment of FTP 1.6 Provides boot loader and related configuration files for pxe 1.7 Get Linux Kernel Files from Installation Mirror 1.8 Set up boot menu and provide system installation file 1.9 Start-up Tes ...

In many applications, H5 is also a good choice if you want to build your own applications quickly. On the App side, keep the entrance of H5, which is also the entrance to display web pages. This article will make an entrance to display web pages with you. First, look at what we've achieved: WebView Functions implemented with H5 can be dyna ...

Three basic modules of twisted network framework: Protocol, ProtocolFactory, Transport. These three modules are the basic components of twisted server-side and client-side programs.Protocol: Protocol Object Implements Protocol Content, i.e. Communication Content ProtocolProtocolFactory: A representation of the factory pattern, where protocols a ...

Preface Loading pictures as needed is a very useful feature that not only improves the performance of the website, but also saves you traffic.For friends who use virtual hosts, if your website is a picture website or a website with more pictures, then lazy loading of pictures is a must. principle The principle of lazy loading ...

Study and Use of Elasticsearch 1. Use of VMware Workstation software VMware Workstation is a powerful desktop virtual computer software that provides the best solution for users to simultaneously run different operating systems on a single desktop and develop, test, and deploy new applications.VMware Workstation can simulate a complete ...

Here we use the WorkerMan framework, the server is CentOS, the Web server is Apache, and the development language is PHP. Because WSS is a combination of WebSocket and SSL, it is necessary to prepare the SSL certificate for the corresponding domain name in advance. Generally, there are three certificate files, such as the following: SSLCertif ...

View. Github 1. Preface Hello, everybody, today I want to talk about a more practical crawling tool to grab the key commodity information of Taobao, that is: Enter keywords, sort by price, grab listed commodity information and download pictures, and support export to Excel. If: After reading the instructions below, the Python language is alm ...

Picture display is often involved in daily page development.Sometimes when there are too many picture resources, we want to delay the loading of pictures, and when the loading fails, we can use a default picture to display them instead.The effect is shown in the diagram: 1. Lazy loading of pictures In fact, the core idea of lazy loading pictur ...