Programmer Group

Introduction to mail system The e-mail system completes the transmission of e-mail based on the e-mail protocol. The common E-mail protocols are as follows 1. Simple Mail Transfer Protocol (SMTP): it is used to send and relay e-mail, occupying 25/TCP port of the server 2. Post office protocol version 3 (POP3): used to store e-mail to the ...

Reference materials: Bird brother's Linux private dishes: Basic Edition, Liu Chao's interesting talk about Linux operating system, UNIX/Linux system management technical manual, 4th Edition, in-depth understanding of Linux kernel, 3rd Edition, advanced programming in UNIX environment, 3rd Edition, Linux kernel source code scenario analys ...

I/O multiplexing I/O complex method: select poll epoll effect: You can listen to multiple file descriptors at the same time, Enables the server to process multiple file descriptors at the same time without introducing multiple processes. Network programs need to use I/O multiplexing technology: ◼ The TCP server handles both listening sock ...

1 MD5 encryption MD5 message digest algorithm (English: MD5 message digest algorithm), a widely used cryptographic hash function, can generate a 128 bit (16 byte) hash value to ensure complete and consistent information transmission. MD5 was designed by American Cryptologist Ronald Linn Rivest and published in 1992 to replace MD4 algorithm. Th ...

This article mainly describes how mybatis is loaded and executed in springboot. Because there will be a lot of content involved, this time we will only explain the call relationship and key code points. In order to avoid the article being too long and sleepy to read, some details that do not affect the overall process will not be involved. Sou ...

Chapter I Q1 brief introduction to the application field of Linux system Linux The server; Embedded Linux System; Software development platform; Desktop applications Q2 briefly describe the characteristics of Linux system Openness, multi-user, multi task, good user interface, equipment independence, rich network functions, reliable s ...

chattr setting file properties Syntax options Chatr is used to modify the hidden permission attribute of the file system; For files and directories, in addition to setting normal and special permissions, you can also use some hidden attributes of files and directories. [root@zaishu ~]# Chatr [+ - =] [properties] file or directory name ...

Django model layer Today, let's talk about Django's model layer. Django provides an abstract model ("models") layer to build and manipulate the data of Web applications. 1. The concept of model: 1. Model introduction The model can accurately and uniquely describe the data. Contains important fields and behaviors for stored da ...

1 install VMware virtual machine The default installation is OK. If you change the installation location, remember to use the VMware installation directory after the changed location 2. Install RedHat red hat system 2.1 virtual machine settings: Create a new virtual machineCustom (Advanced)Select virtual machine hardware compatibility ...

Run a simple Grpc Previously, we successfully installed the Go + running environment. Next, we run a simple Grpc to learn how to reference packages. Dependent package installation For references to dependent libraries, Go + has made many optimizations to make the code easier to write. Just like when printing, Go needs to import "f ...