Programmer Group

1. introduction 1.1. Why study data structure and algorithm? Some people say that data structure and algorithm, computer network, and operating system are the same, away from daily development, except for the interview may not be used in this life! Some people say that I do business development. As long as I am proficient in API, framework ...

Ethereum is a public blockchain platform that provides a smart contract function. To develop an application on Ethereum, you need to install Geth based on Go language on its client. The official website is: https://github.com/ethereum/go-ethereum. 1. Enter the command line window 2. Enter in the command line window geth --datadir "E:\geth ...

Catalog 1, Use URL class 2, Use HttpURLConnection to send GET request 3, Use HttpURLConnection to send POST request 4, Download case Compared with python, Java crawler is a bit more complex. A few lines of python code can grab a web page. Java may need dozens of lines or even more, so python has m ...

I. Introduction 1. background There are many problems in traditional Session based verification, such as Session expiration, excessive server overhead, inability to deploy in a distributed way, and unsuitable for projects with front-end and back-end separation. Traditional token based verification ...

background In order to protect the network security of high security level, the State Security Bureau issued the physical isolation requirements for the classified network on December 27, 1999, and promulgated and implemented the regulations on the confidentiality management of the international networking of computer information system on Jan ...

QQ group communication If there are other problems with the installation, you can go to QQ group for help Environmental installation Development environment requirements: JDK version 1.8 PostgreSQL 9up Node.js Npm Maven 3.6 up Git tools Idea development tools JDK Download and install Official down ...

1, Batch normalization and residual network 1.1 batch normalization Standardization of inputs (shallow models) The mean value and standard deviation of any feature after processing on all samples in the data set are 0 and 1. Standardized processing of input data makes the distribution of each featu ...

1. NAT mode schematic diagram NAT (Network Address Translation) Network Address Translation mode When the user requests to arrive at the Director Server, the requested data message will first arrive at the pre routing chain in the kernel space. At this time, the source IP of the message is CIP and the ...

Edusoho online school connects Alibaba cloud video vod to realize CDN cloud video accelerated playback Many people click to open the video course after uploading the video through edusoho online school to view the video, which has been loading and cannot be played. They have changed the format strictly ...

Learning objectives Configuration of login page Login successful jump implementation Implementation of settlement page query Order implementation Change stock Add points Introduction to payment process Introduction to wechat code scanning payment 1 login page configuration The previous use ...