Overview If the API interface docked with the front-end is captured by a third party and maliciously tampered with the parameters, it may cause data leakage or even tamper with the data. I mainly focus on the three parts of timestamp, token, and signature to ensure the security of the API interface. 1. After the user successfully logs… Read More »
Dependent environment First need java support Download the 1.8 version of jdk After downloading, decompress, and declare JAVA_HOME in the environment variable After saving, use the source command to make the environment variable take effect Download the hadoop file In this post, we will be using version 2.10. Unzip to the directory you want to place in… Read More »
I. Introduction A process is a running activity of a program with independent functions on a certain set of data. In other words, when the system schedules multiple CPUs, the basic unit of a program. Process is not an unfamiliar concept to most languages, as the world’s best language PHP" is certainly an exception. 2. Environment The… Read More »
The current development situation in the technological world is to free developers from tedious application configuration and management, use container images to handle complex program operation-dependent library requirements, and ensure the consistency of the code operating environment. Since the benefits of this are so clear, why doesn’t the infrastructure environment in the enterprise switch to container clusters? The… Read More »
Array Array deduplication Find the largest array Find the smallest array Returns the original array divided by an array whose size is the length Check the number of occurrences of an element in the array Flatten array Default depth expand all Compare two arrays and return the different elements Return the same elements in two arrays Delete… Read More »
This post will summarize 8 component communication mechanisms in Vue.Js. The daily development of component communication is close, and familiarity with component communication can better develop business. Vue.js Passing values between components 1. The parent component passes the value to the child component Generally, this involves the following procedures: Introduce child components in parent components Register subcomponents… Read More »
Q11: Discuss HashMap resizing in JDK 1.8 When putting an item, if the map finds that the current bucket occupancy has exceeded the proportion specified by the Load Factor, then a resize will occur. The resizing process simply means expanding the bucket to twice its original size, then recalculating the index and putting the nodes in the new… Read More »
Q6. How to specify the initial value of the Hashmap in JDK 1.8? Simply use the following declaration. Q7. How to ensure the initial value is 2 to the power of n? In order to ensure the initial value is 2 to the power of n, we have to leverage an algorithm that first finds the bit with… Read More »
This article mainly records the configuration and writing process of ActiveMQ from installation to application to the project. You quickly configure the application following this post. You can download ActiveMQ from its official website. Modify the configuration First, find the activemq.xml file in the config directory. Then, find the <policyEntries> tag, add the following configuration under the tag… Read More »
Nowadays, SpringCloud-based microservice development is becoming more and more popular, and various open-source projects on the Internet are emerging endlessly. We can refer to open source projects to implement many out-of-the-box functions in actual work, but we must abide by certain conventions and specifications. This post combines some of the problems encountered in our actual development to sort… Read More »
Q1. Please breifly discuss Hashmap in JDK 1.8 Hashmap is a map interface based on hash table implementation. This implementation provides all optional mapping operations and allows empty values (value) and empty keys (key). (The HashMap class is roughly equivalent to Hashtable, but it is thread-unsafe and allows null values) This class cannot guarantee the order of mapping;… Read More »
In our daily development, we may casually expose the database password directly in plaintext in the configuration file, which can be done in the development environment, but it is not recommended to do so in the production environment. After all, security is not trivial. No one knows which day the password is somehow leaked. Today we will talk… Read More »
You may want to prevent the user of your web application from debugging your website. Specifically, the user should not access browser developer tools by pressing F12 or Ctrl+Shift+J or by clicking on the customize and control > more tools > developer tools. To accomplish this, you can use the following ready-to-use JavaScript code. Method 1: Only when… Read More »
Go 1.16 contains many Modules-related updates, and you can directly view its Release Note for details. Overall, it contains the following points: Go111module is On by default. If you want to restore the previous behavior, you need to set Go111module to Auto, which almost means that the GOPATH mode will gradually fade out of people’s vision; The go… Read More »
Background Pika is a persistent large-capacity redis storage service, compatible with most of the interfaces of string, hash, list, zset, and set (compatibility details), and solves the capacity bottleneck of redis that is insufficient due to the huge amount of stored data. Users can migrate from redis to pika service without modifying any code. It has good compatibility… Read More »
SOLID principle introduction Following practical and clear design principles is conducive to flexible and reliable software design. SOLID is an acronym for the five essential principles of object-oriented design. When we design classes and modules, following the SOLID principles can make the software more robust and stable. Q1: What are the SOLID principles? S – Single responsibility principle… Read More »
What is CSRF? CSRF is an abbreviation of Cross-Site Request Forgery. It is a script that can send HTTP requests. The victim can be disguised to send a request to the website to achieve the purpose of modifying the website data. CSRF can steal all user cookies after the user clicks a link so that the account is… Read More »
Introduction R2DBC is an asynchronous, non-blocking relational database connection specification. Although some NoSQL database vendors provide reactive database clients for their databases, for most projects, migrating to NoSQL is not an ideal choice. This prompted the birth of a universal, responsive relational database connection specification. As a relational database with a huge user base, MySQL also has a… Read More »
Introduction One-to-many results paging is a prevalent scenario, for example, we want to query the product and product picture information. But many people will encounter the misunderstanding of paging here and get incorrect results. Come to analyze and solve this problem today. Problem analysis Let’s first create a simple commodity table and the corresponding commodity picture relationship table.… Read More »
Idempotency Idempotency means that no matter how many times you execute the request, the result is the same. Speaking of idempotency, you have to say repeated submission. You click the submit button continuously. In theory, this is the same piece of data. The database should only store one item but store multiple items, which violates idempotency. Therefore, we… Read More »