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MQTT protocol is widely used in the field of industrial Internet of things because of its low latency and high efficiency. The previous article introduced how to send MQTT message by code. Based on the previous article, this paper implements the subscription and reception of MQTT message.Operation steps: Introduce related dependencies <de ...

zuul routing gateway Zuul includes two main functions of request routing and filtering: The routing function is responsible for forwarding the external request to the specific microservice instance, which is the basis of realizing the unified access to the external access, while the filter function is ...

Welcome to spring cloud. In this chapter, we will teach you how to create the parent-child project architecture of spring cloud. Knowledge is endless, and stories are good or bad. Articles are purely fictions. Make complaints about them. How can I walk in the Jianghu without any tricks. The technologies ...

order This paper mainly studies the variable transfer of reactor asynchronous thread The problem of threadlocal In the traditional request / response synchronization mode, it is very convenient to use threadlocal to pass context variables. It can save adding common variables to each method parameter, such as the current login user. ...

Preface Spring boot uses the embedded Servlet container by default. When we use external Servlet containers, we will encounter various problems. Environment used: IDEA + apache-tomcat-7.0.91 1.springboot starts tomcat and reports error java.lang.NoClassDefFoundError: javax/el/ELManager Caused by: or ...

SpringAop 2.x Introduction: The principle of namespace based configuration is to use post processor, which is simpler. Characteristic: Simplified configuration, There is no need to implement any interface when writing non intrusive notifications. Use the AspectJ expression to define the tangent point. B ...

Zipkin service tracking principle Create some tracking identifiers (tracking ID, spanId, parentId), and finally build a request process tree. When each business system calls each other, it will pass specific tracking messages to Zipkin. After Zipkin collects tracking information, it will aggregate, process, store, display, etc. users can easily ...

1. Import Maven coordinates <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.0.2.RELEASE</version> </dependency> <de ...

Spring MVC type converter We know from the previous article that spring MVC framework can automatically encapsulate and bind parameters, but sometimes the data we transmit is not necessarily transformed according to the existing type converter. As illustrated by the following example, it is necessary ...

Recommended reading: Ali Liang Jing on both sides: design mode + cache + Spring + virtual machine + MySQL + middleware + concurrency and other problems, all solved Alibaba bytes jump those big factories must ask HTTP how to learn?I suggest you read this article! Ant, byte, PDD social face-to-face via Java post (Distributed + Thread Security + ...