Programmer Help

1. Preface I don't know if you've received this requirement, so just execute some logic when the project starts.For example, simple cache preheating, or broadcasting after going online, and so on.If you use the Spring Boot framework, you can do so with its interfaces CommandLineRunner and ApplicationRunner. 2. CommandLineRunner org.springframe ...

This paper is composed of ImportNew-freely flowing style of writing Translation from javacodegeeks . Welcome to join Java team . Please refer to the requirements at the end of the article for reprint. Singleton classes are very common in Java developers, but they pose many challenges to junior developers. One of the key challenges they face i ...

Introduction to localStorage Use localStorage to store data for key value pairs in the browser. sessionStorage is often mentioned together with localStorage, which can store the data of key value pairs in the browser. But the difference between them is: the data stored in localStorage can be kept for a long time; when the page session ends (tha ...

spring boot uses starter to solve many configuration problems, but how does it solve these problems Here is a simple example to see how starter sets the default configuration 1, Build starter project The project naming specification is: custom name spring boot starter Let's take a look at my last directory structure   1. Modification pom.xml ...

1,const Indicates that the execution step returns at most one row of data. const usually appears in the equivalent query of the primary key or unique index, such as the equivalent query of the primary key id of the t table:It can be considered that it is as fast as a rocket to locate a record by comparing the equivalence between the primary key ...

(1) Part 1: basic jar package running (Tomcat does not need to be configured) [http://60.205.183.114:8081/] 1. Configure Alibaba cloud (Esc student server, image Centos7.7) and connect to the terminal remotely. 2. Install and configure the JDK (refer to https://www.jianshu.com/p/093413f2a04f)a) Install the jdk. b) Find the jdk path configurat ...

preface Configuration files are often used in project development. The existence of configuration files solves a lot of repeated work. Today, I'll share four ways to get configuration files in spring boot. Note: the first three test configuration files are spring boot default application.properties file ############ ...

Configure different access ports for multiple applications in tomcat Open tomcat installation directory and check conf/server.xml <?xml version="1.0" encoding="UTF-8"?> <Server port="8005" shutdown="SHUTDOWN"> <Listener className="org.apache.catalina.core.AprLifecycleListener" /> <Listener c ...

Character stream Java provides some character stream classes to read and write data in character units, which are specially used for processing text files. Character input stream (Reader) java.io.Reader Abstract class is a super class representing all classes used to read character stream, which can read character information into memory. It de ...

Character stream Java provides some character stream classes to read and write data in character units, which are specially used for processing text files. Character input stream (Reader) java.io.Reader Abstract class is a super class representing all classes used to read character stream, which can read character information into memory. It de ...