Android - CatWolf

Android

Method for docking real-time data with visualization application of Internet of things

A visualization application of the Internet of Things is created with the hands of technicians, not just for viewing, it needs to be connected to data to truly play a role. So how to dock business data? Technicians need to understand the method of thingjs data price ~ so that your work can be better shown to others!                                    thingjs- 3D visualization development platform for the In

Android

WeChat applet front-end promise encapsulation

config.js const config = { base_url_api : "https://douban.uieee.com/v2/movie/", } export {config} http.js import { config } from "../config"; class HTTP { requset({ url, method = "GET", data = {} }) { const promise = new Promise((resolve, reject) => { wx.request({ url: config.base_url_api + url, data, method, header: { 'Content-Type': 'json' }, success: res => { // toString() const statusCode = res.statusCode.toString(); if (statusCode.startsWith("2")) { resolve(res.data) } else { this._sh

Android

[ ] How to design application push notifications?

Smartphones have been around for nearly a decade and yet founders still declare mobile the most underhyped technology, according to First Round's State of Startups Survey . And, within mobile, the potential of push notifications reigns supreme. Entrepreneur Ariel Seidman captures this well : It's hard to over-hype the power of mobile push notifications. For the first time in human history, you can tap almost two billion people on the shoulder." That's why Slack's Noah Weiss is a true believer in

Android

5 common application scenarios of message queues

1. Introduction Message queuing middleware is an important component in a distributed system. It mainly solves problems such as application coupling, asynchronous messaging, and traffic cutting. Achieve high-performance, high-availability, scalability and eventually consistent architecture. The most used message queues are ActiveMQ, RabbitMQ, ZeroMQ, Kafka, MetaMQ, RocketMQ. Two, message queue application scenarios The following introduces the common usage scenarios of message queues in practica

Android

One-time proficient in the principle of javascript prototype/inheritance/constructor/class (below)

In the last part, we explained the principles of front-end concepts such as constructors and prototypes, and learned how to share methods between instances through the prototype of the constructor. In the next part, we will mainly look at how to implement the es6 class and the inheritance of the class. Same as the previous article, the focus is on the principles behind it. Only when we understand why we have to design this way can we truly say [Proficient]. If you read the second part very hard,

Android

Use Logback to output logs in SpringBoot applications

Logs are very important for development. Effective output of logs can greatly help locate problems, especially online problems. 1 SpringBoot's support for Logback SpringBoot support Java Util Logging, Log4J2, Logbackand other logging implementation. By default, it is used Logback. Therefore, during development, it can be easily integrated Logback, and SpringBoot provides some default configurations, which can easily output the log to the console or file. Use Starter[spring-boot-starter-web] to c

Android

WeChat applet cloud development

1. Register WeChat Mini Program WeChat applet has a cloud development function, which can save a lot of background development tasks. However, the use of small program cloud development requires registration of small program appid, test and tourists do not have cloud development function. If you haven't registered the applet, you can install the official documentation to register an applet appid first. After the registration is complete, you can fill in the relevant information of the mini progr

Android

WeChat applet Java login process (ssm realizes specific functions and solves the problem of encryption and decryption of private information)

If there is something wrong with the article, please correct me. If you like to read on WeChat, you can also follow my WeChat official account:, javato get high-quality learning resources. 1. Login flow chart 2. Mini Program Client doLogin:function(callback = () =>{}){ let that = this; wx.login({ success:function(loginRes){ if(loginRes){ // wx.getUserInfo({ withCredentials:true,// true success:function(infoRes){ console.log(infoRes,'>>>'); // wx.request({ url: api.loginUrl, data:{ c

Android

Talking about the browser http caching mechanism

The analysis of the browser's http cache can be regarded as a cliche, and a good article will appear every once in a while. The principle is almost a must-test question in interviews for major companies. The reason why I wrote such an article is because I have been working on new technologies recently, I want to "return" to the basics, and I hope to summarize it in more detail. So do you still need to read this article? You can try to answer the following question: When we visit the Baidu homep

Android

[Vue-page-stack] Vue single page application navigation manager officially released

[20191031 Update] Solve the scene problem of page A->page A [20190828 Update] Adapt vue-router 3.1.x In the middle, I was delayed for a month because of complicated online chat. Sorry. Let me talk about the results first. At present, they have been verified in multiple environments, including ios, Android, WeChat official accounts, and WeChat applets (yes, applets can also engage in pure H5 projects). They are all relatively complex businesses. The pure H5 single-page project under webview ca

Android

A large number of hiring at the front end of Huawei's core product line in Chengdu (the future is here, China is promising)

Huawei Chengdu R&D Center recruits a large number of front-end development, responsible for the front-end development and maintenance of core business products; description of job: 1. Responsible for the development of website pages and the realization of front-end effects 2. Assist the designer to realize the page and interaction, assist the product to improve the demand, and provide the technical implementation plan 3. Optimize the code and implementation technology to improve the page pe

Android

MOOC Flask advanced programming practice-4.flask core mechanism

4.1 classic error in flask working outside application context In Section 3.8, we db.create_all(app=app)solved the error of working outside application context through the method. Let's take a closer look at the specific cause of this error. First write a piece of test code from flask import Flask, current_app __author__ = "gaowenfeng" app = Flask(__name__) # current_app=[LocalProxy]<LocalProxy unbound> a = current_app # RuntimeError: Working outside of application context. b = current_app

Android

PHP design pattern study notes one-about automatic loading of PHP classes

Preface When the engineering-level code needs to import a lot of external files, it will cause a lot of code similar to the following to be written in the head of the class file: require_once __DIR__.'/'.$class.'.php'; In this case, we can use __autoload()functions to automatically load classes, but due to the problem of the same function names, PHP officials currently recommend using spl_autoload_register()functions instead of __autoload()functions, because we can define the name of the functio

Android

Detailed explanation and application of HTTP protocol principle

What is the HTTP protocol HTTP protocol (HyperText Transfer Protocol) is a transfer protocol used to transfer hypertext from a World Wide Web (WWW: World Wide Web) server to a local browser. It is the most widely used network transmission protocol on the Internet, and all WWW documents must comply with this standard. HTTP is a communication protocol based on TCP/IP to transfer data (HTML files, picture files, query results, etc.). How the HTTP protocol works The HTTP protocol works on a client-s

Android

Java concurrent programming-concurrent process control and AQS principle and related source code analysis

Reprinted from: juejin.im/post/684490...Java concurrent programming Code GitHub address github.com/imyiren/con... How many ways are there to understand how to create a thread? How to correctly start and stop a thread best practice and source code analysis Multi-case understanding of Object's wait, notify, notifyAll and Thread's sleep, yield, join and other methods Understand thread attributes, how to handle sub-thread exceptions Multi-thread safety and performance issues Principle and Applicatio

Android

System architecture design notes (19)-network storage technology

At present, there are mainly three mainstream network storage technologies, namely, Direct Attached Storage (DAS), Network Attached Storage (NAS), and Storage Area Network (SAN). 1 Direct Attached Storage (Direct Attached Storage, DAS) DAS connects the storage device directly to the server through a SCSI (Small Computer System Interface) cable. It is a hardware stack. The storage operation depends on the server without any storage operating system. Therefore, some documents also refer to DAS as

Android

Read the difference between hashmap, hashtable, concurrenthashmap of JDK7, 8, and 9 in one article

The content is as long as the title, it's been written for a long time. Unless otherwise specified, the source code corresponding to the content is jdk1.7 (compared with 1.8 later)1: Introduction to hashmap (as follows, array-linked list form)HashMap storage structure In the figure, the purple part represents the hash table, also known as the hash array (the default array size is 16, each key-value key-value pair is actually stored in the internal class entry of the map), and each element of the

Android

Talk about the Android application architecture I understand

This article has been authorized to publish exclusively on the WeChat public account guolin_blog ( ) Preface Android architecture may be the most discussed topic in the forum, mvc mvp and mvvm are endless, followed by modularization and plug-inization. In this regard, the debate about which architecture is better has never stopped. My point of view: It is meaningless to compare the advantages and disadvantages of these models without actual projects. Each model has advantages and disadvantages,

Android

WeChat applet advertising components are fully open, let s try new things together

On July 9, 2018, the WeChat team announced the announcement that the advertising components of WeChat Mini Programs will be fully open: "The advertising components of Mini Programs (including mini game categories) are fully open. Developers can apply for the opening of traffic masters in the background of the Mini Program. You can access advertisements in the mini program and get advertising revenue on a monthly basis." Guidelines for the main opening of Mini Program Traffic 1. Opening threshold

Android

How to use MongoDB to realize a high-performance, high-availability active-active application architecture?

With the continuous increase of enterprise service windows, business interruption means a devastating disaster for many enterprises. Therefore, application deployment across multiple data centers has become one of the hottest topics at the moment. Nowadays, in the best practice of application deployment across multiple data centers, databases are usually responsible for handling reads and writes from multiple geographic areas, replication of data changes, and provide the highest possible availa

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