Programmer Think

Preparation Install MongoDB jdk 1.8 maven 3.0 idea Environmental dependence Introduce spring boot starter data mongodb dependency in pom file: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-mongodb</artifactId> </depen ...

Record the daily use commands of docker. This article is mainly for linux + mac operating system. It is not sure whether window is applicable. Use it carefully <!-- more --> 1. docker process Three common case s are docker process start, stop and restart # Start docker service docker start # Shutdown docker service docker stop # Restart d ...

concept The behavior of a class changes based on its state The main idea is to abstract all kinds of concrete state classes. That is, there will be many state classes. Usage scenarios Code contains a large number of conditional statements related to object state Behavior changes with state Characteristic States can be transformed from one ...

There are many different opinions on the Internet. Most of them are copied back and forth. There is no practice. Recently, in the project, we frequently encountered the problem of boot+jackson processing date, so we opened this post. The first is POM. <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/PO ...

1. Single case mode What is singleton mode? In short, ensure that classes defined as singleton patterns have and only have one instance in the program. Features of single case mode: Only one instance (only one object can be created) Self instantiation (class constructor private) Static methods for obtaining instances 2. Implementation o ...

Nginx access log View the current log format in the main profile Search log? Format [root@test-a /]# cd /usr/local/nginx/ [root@test-a nginx]# vim conf/nginx.conf include mime.types; default_type application/octet-stream; server_names_hash_bucket_size 3526; server_names_hash_max_size 4096; log_format combined_realip '$remote_addr $http_x_forwa ...

1. Preface Start with this blog post and officially start the Spring and SpringBoot Source Analysis journey.This may be a long process, because I have read the source code before is very one-sided, Spring source does not have a systematic understanding.From the beginning of this article, I will keep updating and strive to have a systematic und ...

[title] Find the first character that appears only once in a string (0 < = string length < = 10000, all composed of letters) and return its position. If not, return - 1 (case sensitive) [thinking] You can count the number of occurrences of each character in a string, 1. Use two list s to record the characters that have app ...

1. Configure the environment required by Gogs Install nginx sudo apt-get install nginx Install git sudo apt-get install git Install MySQL sudo apt-get install mysql-server # Install mysql mysql -u root -p # Connect to database SET GLOBAL storage_engine = 'InnoDB'; # Set the database mode to InnoDB CREATE DATABASE gogs CHARACTER SET utf ...

Written in front As children's shoes that often use computers to organize files, they should have used to upload and download files from the ftp server. Today, we will learn how to operate files of ftp service through java programs First of all, you should know the ip, path, port, account and password with operation permission of ftp 1 import ...