Programmer Group

solr version: 8.x springboot version: 1.5.6 1. To prepare the springboot project, pom.xml needs to introduce the following jar package <properties>     <project.final.name>htsolr</project.final.name>     <java.version>1.8</java.version>     <project.build.sourceEncoding>UTF-8</project.build.sourceEnc ...

Interceptor (interceptor) 1, Interceptor overview Interceptor is one of the most powerful features of struts 2. It is a mechanism that allows users to do some processing before Action execution and after Result execution. Interceptors are conceptually the same as servlet filters or JDK proxy classes. Interceptors allow for crosscutting, separa ...

1. Background introduction: With the upgrade of MaxCompute version 2.0, the data types supported by Java UDF have expanded from BIGINT, STRING, DOUBLE, BOOLEAN to more basic data types, as well as complex types such as ARRAY, MAP, STRUCT, and Writable parameters.Java UDF uses a method of complex data types, STRUCT corresponds to com.aliyun.odps ...

order This paper mainly studies the schedule message service of rocketmq ScheduleMessageService rocketmq-all-4.6.0-source-release/store/src/main/java/org/apache/rocketmq/store/schedule/ScheduleMessageService.java public class ScheduleMessageService extends ConfigManager { private static final InternalLogger log = InternalLoggerFactory.getLo ...

[TOC] Preface I wrote an article before:< Detailed instruction of JWT for password encryption and microservice authentication> Practical operation (practice example) pom(common), add jwt dependency on the original basis <dependencies> <!--lombok--> <dependency> <groupId>org.projectlomb ...

Application scenario: When it comes to key value pairs, we usually use Map mapping to process them. At this time, the key is equivalent to a description or reference of value, and the specific information is saved in value. We can get the corresponding value through key. But when both key and value store specific information, ...

introduction: Recently, the company is working on an education, training, learning and online examination project. I am mainly engaged in the online course module, mainly doing the course classification, course, courseware creation and online learning and statistical functions, because courseware involves many types, such as video, audio, graph ...

1. Introduction to Docker Mirrors 1. Introduction of Mirror Composition      Hierarchical, with bootfs at the bottom and rootfs above bootfs can be of type btrfs, aufs, lxc and require a kernel, but this kernel is only for user controls that launch containers rootfs is represented as a root file system, which contains many files and directori ...

The previous testing machine used by the company did not empty the original data, resulting in multiple environment versions of mysql, php, nginx, and apache. Because the php version is 5.2, it is too low for testing. I installed the integrated environment directly for the convenience of testing. By checking mysql logs and l ...

Installing maven in linux Download decompression wget -c http://apache.claz.org/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz tar -zxvf apache-maven-3.5.4-bin.tar.gz Import environment variables Open file vi /etc/profile export MAVEN_HOME=/usr/local/apache-maven-3.5.4 export MAVEN_HOME export PATH=$PATH:$MAV ...