original There are already many projects using Arduino to drive a 0.96-inch OLED screen to display various information. If we need to drive OLED to display images, logos, etc. whatever we want, here is a simple and general method. You need to use Image2Cp, a tool for converting images to CPP code. Component list Arduino×1 […]
Tag: tmap
SpringMVC–@RequestMapping annotation
@RequestMapping annotation The function of @RequestMapping annotation The location of the @RequestMapping annotation @RequestMapping annotated properties 1. value attribute 2. method attribute 3. params attribute (understand) Replenish @RequestParam @RequestHeader @RequestBody @RequestBody gets request parameters in json format @ResponseBody @RestController annotation Function of @RequestMapping annotation The function of the @RequestMapping annotation is to associate the request […]
Project practice: component scanning (5) – parse methods with GetMapping or PostMapping and finally encapsulate them into ControllerDefinition
1. ControllerDefinition package com.csdn.mymvc.core; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; //Suppose there is a uri:/fruit/index @Data @NoArgsConstructor @AllArgsConstructor public class ControllerDefinition { private String requestMapping; private Object controllerBean; private Map<String, Method> methodMappingMap = new HashMap<>(); } 2. ComponentScan package com.csdn.mymvc.core; import com.csdn.mymvc.annotation.*; import java.io.File; import java.lang.annotation.Annotation; import java.lang.reflect.Field; import […]
Project practice: component scanning (4) – filtering bean instances with RequestMapping annotations
1. ControllerDefinition package com.csdn.mymvc.core; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; //Suppose there is a uri:/fruit/index @Data @NoArgsConstructor @AllArgsConstructor public class ControllerDefinition { private String requestMapping; private Object controllerBean; private Map<String, Method> methodMappingMap = new HashMap<>(); } 2. ComponentScan package com.csdn.mymvc.core; import com.csdn.mymvc.annotation.*; import java.io.File; import java.lang.annotation.Annotation; import java.lang.reflect.Field; import […]
.NET high-performance development-bitmap index
First, let’s assume such a business scenario. Everyone should be familiar with air tickets. When purchasing air tickets, you first select your desired departure and arrival city and time, then select the cabin class (business class, economy class), and click Query. A flight list will appear. If you click on a flight at will, you […]
Implementing check-in through redis bitmap
Implementation ideas Our check-in function can be completely completed through mysql. CREATE TABLE `sign_record` ( `id` bigint NOT NULL AUTO_INCREMENT COMMENT ‘primary key’, `user_id` bigint NOT NULL COMMENT ‘userid’, `year` year NOT NULL COMMENT ‘Sign in year’, `month` tinyint NOT NULL COMMENT ‘Month of check-in’, `date` date NOT NULL COMMENT ‘check-in date’, `is_backup` bit(1) NOT […]
[[Hash Application] Bitmap/Bloom Filter]
Bitmap/Bloom filter bitmap bitmap concept Use of bitmaps Bitmap simulation implementation bloom filter Bloom filter concept Use of bloom filter Bloom filter simulation implementation Bitmap/Bloom Filter Application: Massive Data Processing Hash splitting Bitmap Bitmap concept Computers usually use bits as the smallest storage unit of data. There are only two binary states: 0 and 1. […]
[Tian Map] VUE3 encapsulates some function hooks of Tian Map useTdtMap.js
It is only packaged based on personal habits and is for reference only. Tianditu API address: http://lbs.tianditu.gov.cn/api/js4.0/class.html In addition to the sky map, this hook also needs to introduce the open source library Image Overlay! ! ! Open source library address: http://lbs.tianditu.gov.cn/api/js4.0/opensource/source.html The detailed description of each method is reflected in the code. First, create […]
Source code analysis SpringMVC’s RequestMapping annotation principle
1. Start initialization Core: After obtaining all the beans existing in the application context, traverse them in sequence, analyze the annotation @RequestMapping that exists in each target handler & target method, and encapsulate its related attributes into an instance RequestMappingInfo. Finally, the mapping relationship between uri & handler is maintained in the internal class RequestMappingInfo […]
[C++ and data structures] Bitmaps and Bloom filters
Table of Contents 1. Bitmap 1. The concept of bitmap 2. Implementation of bitmap ①.Basic structure ②、set ③、reset： ④、test ⑤. Question: ⑥. Advantages, disadvantages and applications of bitmaps: ⑦. Complete code and testing 2. Bloom filter 1. Proposal of Bloom filter 2. Implementation of Bloom filter ①.Basic structure ②. Implementation of three Hash functors ③、 […]