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1. Background Recently, due to the needs of the project, we have migrated all versions of log4j 1.x to the version of log4j 2.x, and the subsequent slf4j integration log4j configuration (the perfect solution for building a project log system using Slf4j integration Log4j2) and log4j2 configuration file details require a good chat.This article i ...

1. What is FastDFS FastDFS is an open source, lightweight, distributed file system that solves the problems of large data storage and load balancing. It is especially suitable for online services with small and medium files (recommended range: 4 KB < file_size < 500 MB), such as photo album websites, video websites, etc. FastDFS is dev ...

Knowledge Points in the Process of Adding, Deleting and Revising 1. If we want to save the data we added, we can use the following way to check the additions and deletions of D language items. auto repo = new xxxRepository(_cManager); repo.save(xxx); //So we save the information in the data table. 2. How to Search Information in D Language a ...

1. Initial Identity Function 1.1 What is a function? < 1 > Encapsulating a function into a space is a function < 2 > Reduce duplicate code 1.2 Define Functions Def -- Keyword in Python () -- Format requirements must be written :--End of statement def len(): Function Body def my_len(): n = 0 for i in dic: ...

Preface Previously, some points related to Java basics were trained for company newcomers, and generic related points of knowledge were systematically sorted out.Share it.I hope that some students who are not familiar with generics will have a complete knowledge of Java generics. Before you start, give you a test. List<String> strList = n ...

Object-Oriented Programming Understanding objects There are two ways to create objects: First: Create an Object object and add attributes and methods to it var person = new Object(); person.name = "Nicholas"; person.age = 29; per ...

Problem statement The original project http request is completed through feign + ribbon + urlconnection. Considering the network and cpu overhead caused by frequent connection release of urlconnection, http client is used as the connection pool. Upgraded, it is found that there are problems of calling downstream service code and tampering with ...

Keyboard is a common control device. In our life, we can see all kinds of buttons. Because of their simple structure and low cost, they are widely used in household appliances, digital products, toys and so on. In this chapter, we will introduce ...

Object-oriented, constructors (constructors) are used to initialize properties when creating objects, and this is used to refer to the current class. Use of Constructors Construct: Construction, construction, construction. CCB 1. Role: Create o ...

Time series (or dynamic series) refers to the sequence of the values of the same statistical index according to their occurrence time. The main purpose of time series analysis is to predict the future based on the existing historical data. In this pa ...