android

Various ways, principles and problems encountered in uploading Spring Boot files from building development scaffolding

Article Directory File Upload Overview commons-fileupload Servlet 3.0 Single file upload Multiple file upload File upload with other parameters Elegant back-end implementation Multiple (file + parameters) upload Solution 1: Upload file Base64 Option 2: upload file url File upload principle Problems encountered Spring Boot upload file size limit The upload file is too large to be blocked Custom tomcat working directory Uploading files using swagger does not work File Upload Overview Spring suppor

Brandon

schedule 11 min read

android

Front-end engineering-making a company's scaffolding

Effectiveness introduction As the concept of front-end engineering continues to deepen, more and more people choose to use scaffolding to build their own projects from zero to one. The one that everyone is most familiar with iscreate-react-appwithvue-cli, They can help us initialize the configuration and generate the project structure, automatically install dependencies, and finally we can run the project with a line of instructions to start development, or to build the project. These scaffolds

Grayson

schedule 9 min read

android

Relearn the behavioral pattern of design patterns

The behavior model is responsible for efficient communication and delegation of responsibilities between objects. Chain of Responsibility Model The chain of responsibility model allows you to send requests along the processor chain. After receiving the request, each processor can process the request or pass it to the next processor on the chain. Applicable scene When different types of requests need to be processed in different ways, and the request type and order are unknown in advance, the ch

Brandon

schedule 40 min read

android

Android AOSP 6.0.1 content provider acquireProvider process analysis

The content provider is one of the main building blocks of the Android application, which can provide content for the application. They encapsulate data and provide it to the application through a single ContentResolver interface. You only need a content provider if you need to share data between multiple applications. For example, contact data is used by multiple applications and must be stored in the content provider. If you do not need to share data between multiple applications, you can use

Melanie

schedule 30 min read

android

Qt compiles security video surveillance system 37-onvif presets

I. Introduction Preset positions are indispensable in the video surveillance system. The prerequisite for responding to the preset position function is to have a PTZ ball machine with preset positions. Some ordinary PTZ dome cameras do not have preset positions. This should be checked. Clearly, if the hardware does not support this function, you will not respond no matter how much you click. In the process of using this video surveillance system, many users will ask this question, why he can't r

Calvin

schedule 14 min read

android

JDK HashMap ( )

0. HashMap ( ) HashMap HashMap HashMap HashMap Map key-value HashMap key value null HashMap jdk1.8 HashMap + HashMap hashCode jdk1.8 8 64 HashMap HashMap == + + HashMap 16 8 64 (2 ) ( ) 64 8 ( ) 6 8 64( ) ( ) i i i = hash & (cap - 1) cap ( ) ( ) 64 8 64 treeifyBin() 8 64 HashMap ; null null; ; jdk1.8 + jdk1.8 + + ; > 8 ( ) 64 ; 1.HashMap HashMap debug @Test public void test01() { HashMap<String, Integer> hashMap = new HashMap(); hashMap.put("a", 3); hashMap.put("b", 4); hashMap.put

Makayla

schedule 11 min read

android

[Turn] Open source Jshop applet mall

Project introduction Jshop applet mall is an open source e-commerce system, including WeChat applet, Alipay applet, APP, official account, H5 terminal, PC terminal, Douyin applet, Today s headline applet, Pippi shrimp applet Programs, watermelon video applets, provide excellent solutions for mobile e-commerce for large and medium-sized enterprises. The backend is developed with Thinkphp5.1 framework, and the execution efficiency, scalability, and stability are trustworthy. And the Jshop applet m

Daisy

schedule 18 min read

android

Glide should be packaged in Kotlin like this (1)

Kotlin should write series like this: SharedPreferences should be written like this in Kotlin Glide should be packaged in Kotlin like this (2) Preface Glide is an image loading library officially recommended by Google, but everyone will encapsulate Glide for later maintenance of the project. The most common is simple encapsulation through the strategy mode, which can well support switching Glide, Picasso, etc. Let us review the implementation of the strategy mode, analyze its pros and cons, and

Bentley

schedule 12 min read

android

Briefly describe the treeShaking of rollup

1. Basic use of rollup import {babel} from '@rollup/plugin-babel' ; import resolve from '@rollup/plugin-node-resolve' ; import commonjs from '@rollup/plugin-commonjs' ; import typescript from '@rollup/plugin-typescript ' ; Import {terser} from ' ROLLUP-plugin-terser ' ; Import postcss from ' ROLLUP-plugin-postcss' ; Import serve from 'ROLLUP-plugin-serve' ; Export default { INPUT:"src/main.js" , output : { file : "dist/rollup_bundle_1.js" , format : "es" , // Many Chinese models amd/es/iife/umd/

Sydney

schedule 19 min read

android

Java java byte 1 short 2 char 2 int 4 long 8 float 4 double 8   java Java Collection Map Collection List Set List ArrayList vector LinkedList   ArrayList   ArrayList ArrrayList 10 11 1.5 ( 1.5 )   vector , , ,JDK1.0 ,Vector ArrayList ,   LinkedList   Set HashCode equals true false HashSet LinkedHashSet TreeSet   HashSet null   HashSet HashSet HashCode equals true false (jdk1.8) 8 HashSet HashMap, HashSet HashMap key HashMap key Set   LinkedHashSet Has

Evan

schedule 41 min read

android

Android WebView and Native communication summary

Many current mobile app developments require embedded WebView to facilitate rapid business development, especially in e-commerce apps, where business changes quickly and there are many activities. Relying only on the native development method is difficult to meet the rapid business development, so the hybrid development model appears. Currently, the more well-known ones areCordova, Ionic, There are domesticAppcan, APICloudDevelopment platform, these types are all dependent on the realization of

Christopher

schedule 16 min read

android

[Smart Car Code review]-Finding the turning point

Series of articles [Smart car Code review] curvature calculation, least squares fitting [Smart car Code review] ramp image and control processing [Smart car Code review] Searching for inflection points [Smart car Code review] Small S Judgment on the road with China and S [Smart Car Code review] Determination of roundabouts and line-up operation Smart car resumption diary [1] Menu index review Smart car resumption diary [2] Common PID, variable structure PID, differential first PID, Fuzzy PID, Ex

Andrea

schedule 11 min read

android

Commonly used string processing functions in Go | Go Topic Month

The functions for processing strings in the go language are mainly in the two packages strings and strconv. strings and strconv packages As a basic data structure, each language has some predefined processing functions for strings. Use in Gostrings Package to complete the main operations on the string. Prefix and suffix HasPrefix Judgment string s Whether to prefix beginning: strings.HasPrefix (S, prefix String ) BOOL duplicated code HasSuffix Judgment string s Whether to suffix end: strings.Ha

Austin

schedule 9 min read

android

Touch your hands, use Dart language to develop back-end applications, come on!

Preface In the past few days, I have posted a few articles about Dart The article on developing back-end applications mainly introduces Dart Some of its advantages, such as asynchronous tasks, concurrent processing, compilation and deployment, and so on. As the saying goes, if you just talk about it, don t practice the fake style, today we re here to really start one Dart Back-end application. What application do we want to develop Suppose we now want to develop a community application, similar

Evan

schedule 17 min read

android

[Path planning] Robot dynamic obstacle avoidance path planning based on matlab A_star algorithm [including Matlab source code 1033]

1. Introduction A algorithm A algorithm is a typical heuristic search algorithm, based on the Dijkstra algorithm. It is widely used in game maps and the real world to find the shortest path between two points. The main thing of the A algorithm is to maintain a heuristic evaluation function, as shown in equation (1). f(n)=g(n)+h(n)(1) Among them, f(n) is the corresponding heuristic function when the algorithm searches for each node. It consists of two parts. The first part g(n) is the actual trav

Eric

schedule 11 min read

android

indictment! If you dare to plagiarize on Muke.com, I dare to sue you!

Friends of the latest development of the squatting incident, here I am! The prosecution process will begin this week! Recently, I was also reading some legal provisions in the "China Copyright Law" and the "Criminal Law of the People's Republic of China", which is also very surprising. Under normal circumstances, a programmer would not read these legal documents, but there are always accidents in life, and I can't help it. After the court formally accepts it, a lawsuit is about to be brought. I

Alejandro

schedule 24 min read

android

webpack

webpack webpack webpack Css import './style.css' import React from 'react'; import ReactDOM from 'react-dom'; ReactDOM.render(<div>hello</div>,document.getElementById('root')); body{ background: red } .class1{ background: red } .class1 src purgecss css glob glob-all mini-css-extract-plugin paths npm i -D purgecss-webpack-plugin mini-css-extract-plugin glob webpack.config.js + const glob = require('glob'); + const PurgecssPlugin = require('purgecss-webpack-plugin'); { test: /\.css/,

Kaden

schedule 5 min read

android

Jetpack learning-1-Hilt

surroundings AndroidStudio(4.2.1) kotlin(kotlin_version = "1.3.71") Note: Compilation exception occurs when kotlin_version = "1.5.0". Jetpack new member Hilt Dependency Injection: Referred to as DI (Dependency Injection). Generally used for decoupling. Square launched the Dagger framework in 2012, based on Java reflection (time-consuming and difficult to use). Google developed fork and modified the Dagger code to Dagger2, based on annotations, to solve the drawbacks of reflection. Over-engineer

Jack

schedule 12 min read

android

A Preliminary Study of Compose

Preparation before use android studio Arctic FoxVersion or newer If it is a new project, you can create a new one when creatingEmpty Compose Activity In the modulebuild.gradleAdd in file android { buildFeatures { compose true } composeOptions { kotlinCompilerExtensionVersion compose_version kotlinCompilerVersion '1.4.32' } } dependencies { implementation'androidx.core :core-ktx:1.3.2' implementation'androidx.appcompat :appcompat:1.2.0' implementation'com.google.android.material :material:1.3.0'

Daisy

schedule 8 min read

android

OpenCV combat [2] HOG+SVM realizes pedestrian detection

table of Contents What is HOG? HOG vs SIFT HOG steps HOG's way of detecting pedestrians Opencv implementation The constructor of HOGDescriptor: Pedestrian detection HOG+SVM steps Simplified HOG calculation What is HOG? Histogram of Oriented Gradient (HOG) feature is a feature descriptor used for object detection in computer vision and image processing. It composes features by calculating and counting the histogram of the gradient direction of the local area of the image . Hog feature combined wi

Kai

schedule 16 min read