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File upload and download File upload and download are very common functions. Many systems or software often use file upload and download. For example: QQ avatar, upload is used. The mailbox also has the function of uploading and downloading attachments. Upload of approved attachment materials in OA system. I Introduction to file upload (* * * ...

Request response understanding diagram Servlet Concept (explained earlier) Steps (explained earlier) Execution principle (explained earlier) Life cycle (explained earlier) Servlet3.0 annotation configuration (explained earlier) Architecture of Servlet Servlet - Interface | GenericServlet – abstract class | HttpServlet - a ...

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1, Compilation and installation of openssl Library Create a new folder under the working directory. Download the openssl library compressed package from the official website and extract it to the folder 1|wget https://www.openssl.org/source/openssl-1.1.1.tar.gz 2|tar -vxf openssl-1.1.1.tar.gz Enter the extracted file directory, namely o ...

outline fio is a very flexible io testing tool. It can simulate various io operations through multiple threads or processes With the development of block devices, especially the emergence of SSD disks, the parallelism of devices is becoming higher and higher. To make good use of these devices, a trick is to improve the iodepth of the device, ...

Confirmation before installation Operating system: host name, IP address, hairstyle version, kernel version [root@localhost ~]# hostname localhost.localdomain [root@localhost ~]# [root@localhost ~]# ip -4 a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN inet 127.0.0.1/8 scope host lo valid_lft forever p ...

MySQL Master-Slave Copy and Read-Write Separation Summary In enterprise applications, mature business usually has a large amount of dataSingle MySQL does not meet practical requirements in terms of security, high availability, and high concurrencyConfigure multiple master-slave database servers for read-write separation 1. Principle of m ...

1. Common system monitoring commands 1.1 problems In this case, you are required to be familiar with the common commands for viewing the Linux system status and prepare for further specific monitoring tasks: View memory informationView swap partition informationView disk informationView CPU InformationView network card informationView ...

Stand alone installation Front work Hardware requirements: 64 bit Linux/Unix/Mac/Windows4G and above disk space Software requirements: 64 bit JDK above 1.8Maven 3.2.xGit Installation: 1. Download the installation package 4.9. 2 download address 2. Upload the downloaded package to Linux It can be uploaded through rz command. For ot ...

Reactor mode At present, the mainstream network communication libraries, such as libevent of C/C + + and Netty of Java, use reactor mode. Reactor pattern is a design pattern of event processing. After I/O requests arrive, the service handler uses I/O reuse technology to synchronously send these requests to the relevant request handlers. How to ...