Czq's Blog

Docker is a popular containerization technology that allows you to quickly create, deploy, and run applications. However, sometimes you may need to install a specific version of Docker instead of the latest version. In this article, we’ll walk you through the steps to install a specific version of Docker on CentOS. Step 1: Install Necessary PackagesFirst, you need to install some necessary packages, including yum-utils, device-mapper-persistent-data, and lvm2. These packages will help you config ...

IntroductionLog4j is one of the widely used logging tools on the Java platform. It allows configuration of logging output to various destinations, such as console, file, and database. In real-world applications, it is often necessary to obtain the file path of the Log4j log file for viewing, analysis, and processing purposes. In this blog, we will discuss a method to obtain the Log4j log file path using Java code. Code exampleIn Log4j, a Logger instance can be used to get all of its Appenders us ...

JavaScript is a popular scripting language used for developing dynamic and interactive web pages. While JavaScript is primarily used in web development, it can also be used in other areas such as server-side scripting, desktop applications, and mobile apps. In this blog, we will explore how to execute JavaScript code and functions in Java. To execute JavaScript code in Java, we can use the ScriptEngine class provided by the Java API. The ScriptEngine class is used to execute scripts written in v ...

Braised pork trotters are a beloved dish in many Asian cuisines. It’s a rich, flavorful, and comforting dish that’s perfect for cold days or for any occasion. In this recipe, we’ll go through the steps of making a simple and delicious braised pork trotters dish. Ingredients 4 pork trotters 10g ginger slices 50ml Shaoxing wine 50ml light soy sauce 25ml dark soy sauce 20g rock sugar 2 star anise 1 piece cinnamon bark 2 bay leaves Salt to taste Water Instructions Clean the pork trotters: Rinse t ...

When building a web application, it’s often necessary to retrieve the IP address of the user who is accessing the application. This information can be useful for various purposes, such as security, analytics, and customization. In this tutorial, we will explore how to retrieve both IPv4 and IPv6 addresses of a user in a Spring Boot application. Retrieving User IP AddressIn Spring Boot, we can retrieve the IP address of a user by injecting a HttpServletRequest object into our controller class and ...

IntroductionWhen developing Java web applications, it is often necessary to check whether the current thread is in a request context. A request context is a context that holds information about a single HTTP request and is typically used in web applications. In this blog post, we will explore how to determine whether the current thread is in a request context using Spring Framework’s RequestContextHolder class. The RequestContextHolder ClassThe RequestContextHolder class is a utility class provi ...

一、IntroductionWireshark is currently one of the most widely used network packet analysis software in the world. The function of network packet analysis software is to listen to network packets and display the most detailed network packet information as much as possible. Wireshark uses Winpcap as the interface to directly exchange data packets with the network card. The following figure shows the initial interface after successfully installing Winpcap and Wireshark: In the initial interface of W ...

SolutionThe most drastic solution is to directly pause all DNS related to Vercel.Or, first pause the resolution of the second-level domain to Vercel, that is, pause example.com->Vercel,and then pause the Vercel of the affected subdomain, that is, pause a.example.com->Vercel. ProblemToday, Alibaba Cloud informed me that an SSL certificate for one of my domains was about to expire. As an experienced developer, I opened the Alibaba Cloud console to apply for a new certificate. However, someth ...

Introduction If you’re experiencing an issue with your Bluetooth earphones where only one side has sound, you might have been searching for solutions online. Unfortunately, not all online advice is reliable. To help fellow users, I’m sharing my tested solution to this problem. Solution Unpair your earphones from your phone. With both earphones turned on, press and hold the power button for 5 seconds until they turn off. Release the button once they turn off. (Both earphones’ lights should not b ...

Question:Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. Example 1: Input: nums = [1,2,3] Output: [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]] Example 2: Input: nums = [0,1] Output: [[0,1],[1,0]] Example 3: Input: nums = [1] Output: [[1]] Constraints: 1 <= nums.length <= 6 -10 <= nums[i] <= 10 All the integers of nums are unique. Solution:Given an array of distinct integers nums, return all possible per ...