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Learning objectives I XML overview 1 Concept XML (Extensible Markup Language): Extensible Markup Language Extensible: all labels are customized. 2 development process Both HTML and XML are standards formulated by W3C (World Wide Web Consortium). At first, the syntax of HTML was too loose, so W3C formulated ...

Chapter 13 IO flow Use of File class 1. An object of file class, which represents a file or a file directory (commonly known as folder) 2. The file class is declared in Java Under IO package 3. The file class involves the creation, deletion, renaming, modification time, file size and other methods of files or file directories, and does not ...

abstract class 1 Concept Can be defined in Java abstract Keyword modified method, which has only declaration and no method body, is called abstract method Classes modified by abstract keyword can be defined in Java. Classes modified by abstract keyword are called abstract classes If a class contains abstract methods, it must be an abstra ...

Wedge In the previous article, we introduced synchronized and learned that synchronized can solve the atomicity problem of some data. In this article, we continue to learn the knowledge of CAS non locking with AtomicInteger as the starting point. Using synchronized to solve the atomicity of i + + Use the synchronized keyword to ensure data a ...

0 overview Make one jiavaweb You can finish the hand training project javaweb The application of knowledge points in the project can also exercise the logical idea of function realization. Let's take a look at the effect diagram below The project is divided into two parts. The first part mainly completes the function of student manag ...

https://mybatis.org/mybatis-3/zh/index.html 1, Mybatis official website definition Mybatis configuration 1. Type aliases Type alias sets an abbreviated name for a Java type. It is only used for XML configuration and is intended to reduce redundant fully qualified class name writing. For example: <typeAliases> <typeAlias alias ...

Prepare the following code in advance, start from the server construction, and deeply analyze the startup process of Netty server. public class NettyBasicServerExample { public void bind(int port){ //The server programming of netty should start with EventLoopGroup, // We want to create two eventloopgroups, // One ...

day05 [exception, thread] primary coverage Exception, thread Teaching objectives Be able to distinguish between exceptions and errors in programs Say the classification of exceptions Say how the virtual machine handles exceptions Three common run-time exceptions are listed Be able to handle exceptions using the try... catch keyword Be able ...

preface In the implementation of TCP long connection function, disconnection and reconnection of the client is a very common problem. When we use netty to realize disconnection and reconnection, have we considered the following problems: How to listen to the disconnection between the client and the server?How to reconnect after disconnection? ...

1, Introductory case MyBatis development preparation Build MyBatis development environment and realize the first case 1. Prepare with Mybatis download mybatis 2. Build MyBatis development environment 1) Create MySQL database and tables Database name ssm; Table name student Create table statement CREATE TABLE `student` ( `id` int(11 ...