Programmer Group

https://blog.csdn.net/xiaoxsen/article/details/79050842 Note: Close the firewall Prerequisite: Prepare three server nodes to install and deploy Zookeeper and ActiveMQ. My three nodes are 192.168.1.130, 192.168.1.163 and 192.168.1.165, respectively. Inst ...

[TOC] 1. What is Dubbo? http://dubbo.apache.org/zh-cn/index.html Apache Dubbo is a high performance Java RPC framework. Dubbo is a distributed service framework dedicated to providing high-performance and transparent RPC remote service invocation solutions and SOA service governance solutions. Simply put, Dubbo is a service framework. If ther ...

1.Cascade is a cascade action. In many_to_one, if cascade is used to cascade related objects, the following code can cascade to save Category objects. Mapping File Settings in Book <many-to-one name="category" column="cid" cascade="save-update"/> When saving a book, if the corresponding category of the book is not saved, save the c ...

This article continues with the introduction of Java's own performance monitoring tools. This article uses jmap tools to play with them.~ jmap (Java Memory Map) command can generate heap snapshots and object statistics of Java applications, analyze the generated heap snapshots, analyze the memory occupied by objects in the heap, check large ...

Definition of POI There are two mainstream toolkits for operating Excel in JAVA: jxl and poi. jxl can only operate Excel 95, 97, 2000, that is, excel suffixed with. xls. poi can operate Excel 95 and later versions, and can operate excel with suffixes of. xls and. xlsx. POI is called Poor Obfuscation Implementation, literally translated as &quot ...

In Java, if you sort objects, you can consider implementing the Comparable interface, but once the properties that need to be sorted are specified, they cannot be modified. The BeanUtils component provides support for JavaBean dynamic sorting, which allows you to specify sorting attributes at runtime. The running effect of the example is shown ...

    In the project, we need to do the interface automation test, so we go to do the experiment, and do the experiment from building the test environment. In the process of learning, we will certainly encounter different problems, so we spent two days to make a simple interface automation environment, and also encountered som ...

In our actual program development, we often need to import data system from excel. In order to prevent users from entering text randomly in excel, some places need to use drop-down selection, we need to generate templates dynamically from the program. This example briefly explains how to generate cascade drop-down selections.   Effect d ...

Spring Cloud is a distributed system that provides more flexible configuration and use. The function is very rich. Eureka Server will provide service registration service, after each service node starts, it will register in Eureka Server, so that Eureka Server has the information of all service nodes, and Eureka has a monitoring page, which ca ...

Catalogue 1. Configuration 2. Start all servers of zookeeper pseudo cluster 3. Access Client 4. Writing startup scripts 1. Configuration zookeeper download address: http://mirrors.cnnic.cn/apache/zookeeper/zookeeper-3.4.6/  Deploy three servers on a machine, create a folder zookeeperLab under the specified folder, create three folders server ...