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2.1 UDP uses ECs to write simple chat rooms In the past, I learned network programming and wrote a series of notes. But I didn't rent a server at that time, so I didn't really learn network programming at all. This time, I will build the server program I wrote on the alicloud server I rented. Then we made a series of attempts. Among them, I ...

Spring MVC learning notes Part5 1. Principle of file upload This section will review the traditional file upload methods of Java Web and learn the more convenient file upload components provided by spring MVC. First, let's review some pre knowledge of file upload. The enctype value of the form must be: multipart / form data (the default valu ...

catalogue Disk performance index Attention Usage scenario Performance testing tool fio Disk I/O observation Interpretation of iostat index ​ Process I/O observation pidstat iotop Question How to determine whether it is random io or sequential io? Disk performance index Utilization, saturation, IOPS, throughput, response time, etc ...

1. 9 built-in objects of JSP (used directly without creating) pageContext, page, page Request completes a request and the response object responds Session one session, application the whole server, exception exception exception, out output object, config configuration 2.4 large scope (different scope of storage attributes < scope &gt ...

Network socket Basic skills: two languages, one scripting language. Implement the function first. Discussion: problems needing attention in cross host transmission. 1. Byte order problem: large end storage: high byte at low address Small end storage: lower byte at X86 low address 0x00 00 00 05 Da 05 00 00 00 Small 00 00 05 Distinguish between ...

Foreword: This small project uses Java Tomcat local server to realize the function of reading SQL Server data and comparing the input account password with the existing account password in the database. Java source code download link: (Resources pending review) 1 System overview 1.1 System Introduction Based on the WeChat applet, we can easi ...

1. Introduction to docker Docker is an open source application container engine, which allows developers to package their applications and dependent packages into a portable container, and then publish them to any popular Linux or Windows operating system machine. It can also realize virtualization. The container completely uses the sandbox me ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it preface Environment and related software: VMWare 14, CentOS 7, SecureCRT. Tip: the following is the main content of this article. The following cases can be used for reference 1, Vie ...

WeChat official account: operation and development story, author: Jiang Zong Hello, I'm Xiao Jiang. A low-level operation and maintenance engineer. The previous article talked about the source code deployment of PostgreSQl 12. Here we talk about the master-slave stream replication and archiving configuration of PostgreSQl 12. Two forms of ...

Important concepts Channel channel is one of the core concepts of Netty. It is the main body of Netty network communication. It is responsible for network communication, registration and data operation with the opposite end. Every time Netty establishes a connection, there will be a corresponding channel instance, and there is the concept o ...