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Simulate a story, randomly find a few beautiful pictures from Baidu pictures, download them, save them locally, and download them in order first 1 sequential synchronous Download import random import time import requests urls = [ "https://t7.baidu.com/it/u=3676218341,3686214618&fm=193&f=GIF", "https://t7.baidu.com/it/u=3 ...

springboot notes Reference from http://c.biancheng.net/spring_boot/ Parent project dependency management <!--SpringBoot Parent project dependency management,spring-boot-starter-parent Is all Spring Boot The parent dependency of the project, which is called Spring Boot The version arbitration center can uniformly manage some commo ...

Before you get familiar with factory mode, you should first understand the six guidelines before writing c + + programs Opening and closing principle: do not modify existing codes, only add codes.Dependency Inversion Principle: use abstract classes instead of concrete classes to solve problems. (isolation change, package change)Richter substit ...

Relatively speaking, the writing is fairly complete. Basically, that's all you can use in your work. A good brain is better than a bad pen. Stored procedures, stored functions, engines, transactions, scheduled tasks, triggers, variables and so on are included. You can collect those you are interested in! 1. Connect to mysql mysql is divide ...

Day1 Reference What is a reference A reference is a pointer. A reference is just a high-level modification based on correction to make the code easier to read. A reference is a reference to an existing variable. In other words, "reference variable" must refer to an existing variable. It is not a new variable itself. They do not rea ...

zookeeper Java client Project construction The official client of zookeeper is not separated from the server code. They are the same jar file, so we can directly introduce zookeeper maven. Please keep the version here consistent with the server version, otherwise there will be many compatibility problems <dependency> <groupI ...

Content overview What is multithreading, synchronous asynchronous concept, thread safety (synchronization between threads), communication between threads, JDK1.8 parallel contracting, thread pool principle analysis, lock 1. Thread: an execution path that does not interfere with each other. It is divided into user thread and daemon thread. ...

Thread safe object creation, callback and Deconstruction in C + +It is not difficult to write thread safe classes. You can use synchronization primitives to protect the internal stateMost STL classes are not thread safe and need to be locked externally to ensure simultaneous access by multiple threadsSecure object creationThe only requirement i ...

preface Concurrent programming technology is an important knowledge point in Java. How much do you know about the following? Overview of process, thread and collaboration relationship Process: in essence, it is an independently executed program. Process is the basic concept of resource allocation and scheduling by the operating system. T ...

This way to achieve code scanning login is too sweet!!! If you need more tutorials, just scan the code on wechat           1, First you need a table Record who scanned the code. Who logged in. User_Token table The fields are as follows: uuid: used to ensure uniqueness userId: who logged in loginTime: login time createTime: the c ...