I don't have to look for objects. I just want to learn the principle of spring MVC

๐Ÿ‡ Small wood come Yes \textcolor{Orange} {here comes Koki} Here comes Koki ๐Ÿฃ ...

Posted by mblack0508 on Sun, 28 Nov 2021 00:35:20 +0100

Hospital physical examination management system based on SSM framework

Today, we introduce a hospital physical examination reservation system based on SSM framework, which has complete functions. Project requirements: Functional requirements: The system is divided into three roles: system administrator, doctor and physical examination personnel. The system administrator mainly has the following f ...

Posted by lvitup on Fri, 26 Nov 2021 23:57:54 +0100

MySQL index -- how to improve query speed

What is the index? If you have been to the library, you should know the library's retrieval system. The library has prepared a search catalogue for books, including book name, book number and corresponding location information, including which area, shelf and floor. We can quickly know the location of books and get the books we need through th ...

Posted by xXx_Hobbes_xXx on Fri, 26 Nov 2021 16:21:40 +0100

Introduction to python: reading and writing files

Read write file read Open a file through the built-in function open() and return the file object. If it cannot be opened, OSError will be thrown. File content Hello Zhang San Outlaw maniac Lin Daiyu Fengxue mountain temple read If the file is small, read() is the most convenient one-time read file = open("222.txt", mode="r", encoding ...

Posted by jlarson on Fri, 26 Nov 2021 13:34:21 +0100

Source code analysis of ConcurrentHashMap 3.put() method

1.putVal() method General process of writing data Pre write operation 1. ConcurrentHashMap does not allow NULL key or value, and an exception will be thrown 2. Before writing data, the hash value of the key will be processed once. spread() Write data flow The entire write data is a spin (dead loop) operation. Case 1: the current tab ...

Posted by PHPThorsten on Thu, 25 Nov 2021 21:48:57 +0100

[consolidate the foundation of java] network programming, I read it and said it was good

Three elements of network programming Protocol: TCP/UDP IP address Port number TCP TCP: transmission control protocol. TCP protocol is a connection oriented communication protocol, that is, before transmitting data, establish a logical connection between the sender and the receiver, and then transmit data. It provides reliable error ...

Posted by josemi on Thu, 25 Nov 2021 01:31:03 +0100

[in simple terms, Java multithreading, mybatis interview questions and answers

ExecutorService executorService = Executors.newFixedThreadPool(threadPoolNum, r -> new Thread(r, threadName)); The underlying layer of Executors uses ThreadPoolExecutor. We can understand some behaviors of ThreadPoolExecutor through ThreadPoolExecutor constructor. ThreadPoolExecutor( int corePoolSize, int maximumPoolSize, lo ...

Posted by Goose87 on Wed, 24 Nov 2021 06:36:28 +0100

Easily complete a distributed transaction TCC, nanny level tutorial with Java

What is TCC? TCC is the abbreviation of Try, Confirm and Cancel. It was first proposed by a paper entitled Life beyond Distributed Transactions:an Apostate's Opinion published by Pat Helland in 2007. TCC composition TCC is divided into three stages Try phase: try to execute, complete all business checks (consistency), and reserve necessary bu ...

Posted by mdemetri2 on Tue, 23 Nov 2021 21:05:16 +0100

[JAVA] poi parsing Excel table -- batch importing data

1. Brief overview ๐Ÿ˜ต It's better to teach people to fish than to teach people to fish. I also spent a lot of time querying information and learning this. This article only represents my personal views and positions. If there are mistakes, please comment and point out the exchange. In order to take care of novices and understand the tutorials ...

Posted by brooksh on Tue, 23 Nov 2021 20:57:38 +0100

Huffman tree (optimal binary tree)

Basic introduction: 1) to set n Weights as n individual leaf node , construct a binary tree if the Weighted path length degree ( wpl ) reach To the minimum, such a binary tree is called Optimal binary tree , also known as Huffman tree (Huffman Tree ) 2) Hector husband Man tree It is the tree with the shorte ...

Posted by tHud on Tue, 23 Nov 2021 16:18:20 +0100