Programmer Group

1, Tomcat processing request As mentioned in the previous chapter, when tomcat processes a request, it first converts the request object into a ServletRequest through the connector Coyote, and then passes it to Catalina for processing. There are four key containers in Catalina: Engine, Host, Context and Wrapper. The four kinds of containers ar ...

Responsibility chain model Business requirements: OA system procurement approval requirements (Procurement approval items of school OA system): Purchaser purchases teaching equipmentIf the amount is less than 5000, it shall be approved by the Dean [0 < = x < = 5000]If the amount is less than 10000, it shall be approved by the presiden ...

vue unit test vue unit_test jest Refer to the official website description https://vue-test-utils.vuejs.org/zh/installation/ 1. Browser environment npm install --save-dev jsdom jsdom-global // In the setting / entry of the test (this sentence is wrong, don't worry about it) require('jsdom-global')() 2. The first thing we need t ...

1. Is java value passing or reference passing?   This is a controversial but not controversial question. If you ask, you can answer that it is value transmission. Let's learn about parameter passing in Java   2. What is value passing and reference passing? Value transfer: Value passing refers to copying and passing a copy of the actu ...

1. Experimental task 1 Task 1-1 　　 task1_1.asm source code assume ds:data, cs:code, ss:stack data segment db 16 dup(0) data ends stack segment db 16 dup(0) stack ends code segment start: mov ax, data mov ds, ax mov ax, stack mov ss, ax mov sp, 16 mov ah, 4ch int 21h code ends end start   　　task1_1 s ...

The existence of components, like encapsulating a function or creating a package that can realize some functions, has the advantages of reuse, maintenance and avoiding variable pollution For components, encapsulation is a complete set, including HTML, CSS and JS. It realizes a complete set of reuse. In order to facilitate modifying the content ...

What are atomic classes and what are their functions? inseparableAn operation is non interruptible and can be guaranteed even in the case of multithreadingjava.util.concurrent.atomicAtomic classes are similar to locks to ensure thread safety in concurrency. However, atomic classes have some advantages over locksFiner granularity: atomic variab ...

✨ Learn, grow and love life with warmth ✨      preface Today, let's talk about the content related to linux commands. In the ranking of the top 500 operating systems of supercomputers in the world, the proportion of Linux has been maintained at more than 85% for a long time in recent ten years, and has been showi ...

Concept and definition of FSTThe full name of FST serialization is Fast Serialization Tool, which is an alternative implementation of Java serialization. Since the two serious shortcomings of Java serialization mentioned above have been greatly improved in FST, the characteristics of FST are as follows:The serialization provided by JDK is incre ...

1, Problem description Problem Description: the n queen problem studies how to place n queens in n × N's chessboard, and the Queens can't attack each other. Give you an integer n and return the solution of all different N Queen problems. Each solution contains a different chess placement scheme for the n-queen problem, in which 'Q' a ...