Java

Master Arthas: Achieve 5 Years of Expertise with Just 3 Years of Experience!

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Master Arthas: Achieve 5 Years of Expertise with Just 3 Years of Experience!

Source:https://juejin.cn/post/7114540497187635208Table of Contents Introduction Usage Scenarios Installation Common Commands Others Introduction Arthas is an open-source Java diagnostic tool from Alibaba that dynamically tracks Java code and monitors JVM status in real-time. It allows for easy troubleshooting of JVM-related issues without interrupting program execution. It supports JDK 6+, and is compatible with Linux, Mac, and Windows. … Read more

HTTP Client Connection: Choosing Between HttpClient and OkHttp

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HTTP Client Connection: Choosing Between HttpClient and OkHttp

Click on the blue text above“ Reply with “666” to receive the most popular Java core knowledge summary on the internet Is He Tiantian here? https://www.jianshu.com/p/68c30beca612 Code example: https://github.com/TiantianUpup/http-call Introduction The reason for writing this article stems from a conversation with a friend. This touches on my knowledge blind spot, so I started by searching … Read more

Detailed Setup and Practical Guide for the HTTP Mock Tool WireMock

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Detailed Setup and Practical Guide for the HTTP Mock Tool WireMock

WireMock is a widely used and open-source HTTP service mocking tool, suitable for various scenarios such as interface automation, unit testing, and integration testing. WireMock can run as a standalone server or be embedded in test code, supporting multi-language SDKs and multiple protocols such as REST and SOAP. The core advantages of WireMock lie in … Read more

Understanding the SPI Mechanism in Java

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Understanding the SPI Mechanism in Java

The SPI (Service Provider Interface) is a built-in service provider discovery mechanism in JDK.It can find service implementations for a specific interface.Demo: public class TestSpi { public static void main(String[] args) throws InstantiationException, IllegalAccessException { ServiceLoader<SpiInterface> load = ServiceLoader.load(SpiInterface.class); Iterator<SpiInterface> iterator = load.iterator(); if (iterator.hasNext()) { SpiInterface next = iterator.next(); next.spiInterFaceMethod("hello"); } } } Interface: … Read more

Essential Guide to Choosing the Right Programming Language: Python, C++, C, and More

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Essential Guide to Choosing the Right Programming Language: Python, C++, C, and More

With so many programming languages like Python, C++, and C, how should I choose? There is no “best” language, only the “most suitable” one. The choice depends on what you want to do (Web, App, data analysis, system development?), the difficulty of learning, community resources, and personal interest. Beginners should prioritize languages that are syntax-friendly, … Read more

Java Security Mechanism: Implementation of Encryption and Decryption Algorithms in Java

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Java Security Mechanism: Implementation of Encryption and Decryption Algorithms in Java

Java Security Mechanism: Implementation of Encryption and Decryption Algorithms in Java In modern software development, data security is a crucial topic. Encryption technology can protect sensitive information from unauthorized access. In this article, we will introduce how to implement basic encryption and decryption algorithms in Java. 1. Basic Concepts of Encryption and Decryption Encryption: The … Read more

Practical Implementation of MD5 Encryption Algorithm for File Integrity Verification

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Practical Implementation of MD5 Encryption Algorithm for File Integrity Verification

1. Basic Concepts MD5 (Message-Digest Algorithm 5) is a widely used hash function that generates a 128-bit (16-byte) long “digital fingerprint” or hash value for each different file. This hash value can be seen as a unique identifier for the file, similar to an ID number. Its core function is to verify the integrity and … Read more

The Correct Way to Publish-Subscribe MQTT Messages in Java

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The Correct Way to Publish-Subscribe MQTT Messages in Java

MQTT is a widely used messaging protocol in IoT projects, utilizing a publish–subscribe model for message communication. Below, we will demonstrate how to implement publishing–subscribe message data to an MQTT server using Java. First, include the pom dependency: <dependency> <groupId>org.eclipse.paho</groupId> <artifactId>org.eclipse.paho.client.mqttv3</artifactId> <version>1.2.5</version></dependency> Publish a JSON message to vehicle/monitor/{userId} as shown in the demo below: public … Read more

Introduction to C Language Basics: Fundamentals Remain Unchanged Despite Changing Times

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Introduction to C Language Basics: Fundamentals Remain Unchanged Despite Changing Times

The Personal Computer EraBefore the rise of the Internet, it was the era of personal computers. Aside from embedded hardware, software dominated the IT landscape, such as operating systems and office software. The popular programming languages at that time were:C/C++, C#, and similar languages.The Internet EraWith the innovation and development of information technology, the Internet … Read more

Open Source IoT Gateway iBoot: Empower Your Java Code to Dominate Factory Devices!

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Open Source IoT Gateway iBoot: Empower Your Java Code to Dominate Factory Devices!

Introduction In this era where everything can be connected to the internet, are you still troubled by the “language barrier” of industrial devices? How can old Modbus devices and the latest MQTT devices communicate seamlessly? Today, we will dissect a hardcore IoT gateway written in Java—iBoot. Here’s the open-source address: https://gitee.com/iteaj/iboot 🔥 Three Major Advantages … Read more