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This article mainly introduces how to build SpringBoot micro-service and achieve service configuration reading and hot loading, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let's take a look at it.

The Spring Boot official website provides a quick launch page where https://start.spring.io/ fills in the basic information and generates the corresponding project catalogue. The specific project catalogue is as follows

DemoApplication is the entrance of our main program, and application.properties is the configuration file of the project. The whole Spring Boot project uses maven to manage dependencies, and many of the dependencies we need will have corresponding starter packages.

First of all, we need to introduce the dependency package of Nacos config and add the following dependencies to pom.xml:

Com.alibaba.boot nacos-config-spring-boot-starter ${latest.version}

"Note: version 0.2.x.RELEASE corresponds to Spring Boot 2.x, and version 0.1.x.RELEASE corresponds to Spring Boot 1.x." Select the corresponding release version according to our project spring-boot-starter-parent.

Next, add the Nacos server address that was successfully deployed in the previous article to the application.properties configuration file:

Nacos.config.server-addr=127.0.0.1:8848

Add the corresponding note at the entrance of our main program, load dataId as the configuration source of demo, and enable automatic update to achieve hot loading of the configuration (autoRefreshed = true).

Set the corresponding attribute values in the controller layer through the @ NacosValue annotation of Nacos

${NacosCacheConfig}

Launch the DemoApplication browser to access http://localhost:8080/demo-config/get, and you can see that the content returned by the browser is

Release the configuration we need to modify to Nacos server through Nacos's OpenAPI (https://nacos.io/zh-cn/docs/open-API.html)). DataId is demo, and the configuration content is: NacosCacheConfig=enable

Curl-X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=demo&group=DEFAULT_GROUP&content=NacosCacheConifg=enable"

When you visit http://localhost:8080/demo-config/get again, you can see that what the browser returns is

At this time, we do not restart the service, so we can verify that the configuration is hot loading and update the configuration without stopping the service. At the same time, if you think it is troublesome to call OpenAPI, you can directly edit the corresponding configuration in the console and click publish. For more information, please see the figure below:

To display the existing configuration information on the console, we directly edit the text text of the configuration, click publish, and the system will let you reconfirm, confirm the release, and then refresh the browser. You can see that the configuration has been updated at this time.

Thank you for reading this article carefully. I hope the article "how to build SpringBoot micro service and achieve service configuration reading and hot loading" shared by the editor will be helpful to you. At the same time, I hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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