Programmer Think

Use of xpath selector 1. What is an xpath selector? XPath (XML Path Language) is a language for searching information in XML documents. It can be used to traverse elements and attributes in XML documents. It is more convenient, simple and acceptable ...

Links to the original text: https://my.oschina.net/mohaiyong/blog/221296 Simple queries were made through find/find One, and it seemed too simple to find out in a trance what was mi ...

Links to the original text: https://my.oschina.net/mohaiyong/blog/221286 Cache code has been written a lot before, but has not been sorted out, always lazy! In this case, we need to d ...

The previous article introduced the introduction of Mybatis, followed by the previous continuation, can achieve the addition and deletion of Mybatis check. First, the test class needs to be modified. package com.w.test; import java.io.IOExcept ...

Generally speaking, Spring Security is the mainstream solution for privilege management in Spring Boot, but Shiro can be used only from a technical point of view. Generally speaking, the comparison between Spring Security and Shiro is as follows ...

Tomcat server is a free open source web application server, which belongs to lightweight application server. It is widely used in small and medium-sized systems and occasions where concurrent users are not very many. It is the first choice for developing and testing JSP programs. Generally speaking, Tomcat, like apache or Nginx web servers, ha ...

RESTful architecture is one of the most popular Internet software architectures.It is clear, standard-compliant, easy to understand and easy to expand, so it is being used by more and more websites. 1. What is a RESTful architecture 1.1 REST Term Interpretation REST -- REpresentational State TransferFirst, the obscurity is due to the removal of ...

Author: Vinicius Grippa Translator: Guan Changlong In this article, we will discuss how to set up replication from MySQL 8.0 to MySQL 5.7. In some cases, using this configuration can be helpful. For example, in the case of MySQL upgrades, it would be useful to use a newer version of MySQL master server as a rollback plan for older versions o ...

Ask questions Through previous research on parsing excel in java, it was found that the parsing of Excel in some complex formats could not be satisfied, such as The excel of this format cannot be parsed using the previous method, so how should we p ...

Official Documents https://hadoop.apache.org/docs/r3.1.1/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html#Configuration_details ** 1. Resource Role Planning ** ** 2. Configuration ** 2.1 Backup of fully distributed cluster. If you ...