Programming

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February 18, 2020Programming
How to Commit Gracefully on Git and Auto-generate the Changelog
Have you ever complained at work about other people's messy commits — no note on why or what each commit did? When contributing to open-source projects on GitHub, if your commit doesn't follow their template, your merge request won't be accepted. Messy commits not only affect others; at release time the changelog should be auto-generated, but commits not written per the rules can't be tallied automatically. So today I'll write about how to commit gracefully on Git and auto-generate the changelog. This article only focuses on the posture of committing; the commit command and other topics are not discussed for now.
ProgrammingDevelopmentCodeGitHubGit
February 17, 2020Programming
Spring Cloud Microservices Beginner Tutorial (2): Service Registration and Discovery — Eureka
This section starts from scratch: we create a new Maven multi-module project and complete a basic demo of Spring Cloud Eureka-based service registration and discovery. The demo uses the IntelliJ IDEA development environment. Create a new Maven project in IntelliJ IDEA with JDK 1.8. I prefer manual operations, so first create an empty Maven project with groupId net.renfei, artifactId cloud, and version 1.0.0.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 11, 2020Programming
Tutorial: Using ngrok for Intranet Penetration — Map Your Local Machine to the Internet for WeChat Platform Debugging
Not long ago my site connected to the WeChat Official Account platform. Debugging was inconvenient — deploy the code to the server to test? That's unlikely, and could even affect the live system. So I used the intranet penetration service provided by ngrok to map my computer to the internet. Today I'll share how to use ngrok for intranet penetration and map your computer to the internet.
NetworkDevelopmentOps
February 10, 2020Programming
The window.opener Security Vulnerability and Using the rel=noopener Tag
Recently I updated my site's code to add the rel=noopener tag to friendly links and external links, so today let's discuss why we use the rel=noopener tag. In fact, this is a security vulnerability — JavaScript provides window.opener to get the Window object that created the window, and that's where the problem begins. Let's take it step by step.
ProgrammingDevelopmentCodeWebsiteOpsSecurity
February 7, 2020Programming
Spring Cloud Microservices Beginner Tutorial (1): Microservices Introduction
My personal blog site has always stuck to one major update per year, but this time I decided not to update it, because the next update would mean adopting microservices. Using a microservices architecture for a small site would be overkill, and it takes too much time and effort to maintain. So instead of rewriting my blog from scratch, I turned it into a tutorial series.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 3, 2020Programming
[3] Scala Development Tutorial - Scala Basics: Variables and Constants
In "[2] Scala Development Tutorial - Scala Basics: Data Types" we discussed data types. This article will discuss variables and constants in Scala. Before learning how to declare variables and constants, let's first understand what variables and constants are: 1. Variable: A quantity whose value may change during program execution is called a variable, e.g., time, age. 2. Constant: A quantity whose value does not change during program execution is called a constant, e.g., the value 3, the character 'A'.
ProgrammingDevelopmentScalaCode
December 11, 2019Programming
[2] Scala Development Tutorial — Scala Basics: Data Types
From the table above we can see that everything in Scala is an object — there are no primitive types like in Java. Some concepts also differ from Java: Scala includes a few notions of 'nothingness' (Null, null, Nil, Nothing, None, and Unit). Null is a trait (if you're not familiar with traits, think of it as somewhat like an abstract class in Java). There does exist an instance of null.
ProgrammingDevelopmentScalaCode
December 10, 2019Programming
[1] Scala Development Environment Setup Tutorial — Using IntelliJ IDEA
On the IntelliJ IDEA startup screen, go to Configure → Plugins, type Scala in the search box, and install the Scala plugin; IDEA will ask to restart after installation for the plugin to take effect. Next, create a Scala project: click Create New Project, choose Scala on the left and IDEA on the right, click Next, name the project (here, HelloScala), then pick a storage location. If this is your first build, you'll also need to download the Scala SDK.
ProgrammingDevelopmentScalaCode
December 9, 2019Programming
The Big Pitfall of Reading Files After Packaging a Spring Boot Project as a JAR — Using ClassPathResource to Get a File Under classpath Fails
Locally the file reads fine, but once packaged as a JAR and uploaded to the server it can't be fetched; the error is: class path resource [xxxx] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:xxxx.jar!/BOOT-INF/classes!xxxx. Enough talk — here's the correct way: use PathMatchingResourcePatternResolver.
ProgrammingDevelopmentJavaCode
December 5, 2019Programming
Apple's Black Magic: After Upgrading to macOS Catalina 10.15, Files and Disks Appear Twice, Plus an Extra 'Macintosh HD - Data' Partition
As early as 2015, Apple engineers added System Integrity Protection to El Capitan, requiring root to modify any system file — but malware with root could still damage system files. In Catalina 10.15, Apple engineers went further, fully separating system files from user files into a new file system that is read-only and cannot be written to.
DevelopmentDaily