Getting started with springcloud (6) config

preface

I haven’t updated it for 4 days. How can I say, I’m very busy, very busy, very busy. It’s mainly about graduation and moving from one city to another. During this period, it should be kept every 2 or 3 days as far as possible, and no more than 4 or 5 days at the latest.

With the increase of modules, there will be a common problem of complicated configuration files. You have to open many layers of directories to find the configuration files each time. The config component in springcloud is to solve this problem. The unified management of configuration files can be realized through simple configuration.

Config server

Importing config server

Create an empty config parent module, create a config server sub module below, and modifyPOM file of sub module

Note that it is the POM file of the child module. Unlike before, the POM file of the empty parent module is modified

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-server</artifactId>
    </dependency>
</dependencies>

configuration file

Because it is not necessary to register in Eureka for the time being, the preparation of the configuration file is relatively simple

server:
  port: 8101

spring:
  cloud:
    config:
      server:
        git:
          uri: https://gitee.com/cutey_none/springcloud-study-config
          username:
          password:
      label: master

spring.cloud.config.server.git.uri: the address where the file is stored. The client will get the configuration file from here. It can be local or Git

If it is an open warehouse, thenusernameandpasswordDo not write

Because createdspringcloud-study-configThe permissions set for the warehouse are open, so it is OK to directly use mine or create a warehouse by yourself. Just create a warehouse in the normal GitHub or gitee.

The warehouse places the configuration files of each micro service

An example is managementconfig-clientThe configuration file of the microservice (which will be created later), so you need to create one in the warehouseconfig-client-dev.properties(-dev indicates the configuration file in the development environment)

config-client-dev.propertiesThe contents of the document are as follows, which can be regarded asconfig-clientSome configurations of the service

Main startup class

increase@EnableConfigServerAnnotation to provide config service support

@SpringBootApplication
@EnableConfigServer
public class ConfigServer8101 {
    public static void main(String[] args) {
        SpringApplication.run(ConfigServer8101.class, args);
    }
}

test

Springcloud config has its own HTTP service to access resources

• /{application}/{profile}[/{label}] >> /config-client/dev
• /{application}-{profile}.yml >> /config-client-dev.yml
• /{label}/{application}-{profile}.yml >> /master/config-client-dev.yml
• /{application}-{profile}.properties >> /config-client-dev.properties
• /{label}/{application}-{profile}.properties >> /master/config-client-profile.properties

Single runConfigServer8101You can access resources from the server by using the above five methods

Config client

Importing config client

It’s been said beforeconfig-clientThis is the module to be created next. The final project structure directory is as follows

Then modifyconfig-client9501The POM file of the module. Note that the dependencies introduced by the server and the client are different

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
</dependencies>

configuration file

The name of the configuration file isbootstrap.yml

Because the client needs to set the URI of the server, it shouldLoad client configuration file first

server:
  port: 9501
spring:
  application:
    name: config-client
  cloud:
    config:
      profile: dev
      label: master
      uri: http://localhost:8101

spring.cloud.config.uri: the address of the server, where to get the configuration file

Main startup class and business class

@SpringBootApplication
@RestController
public class ConfigClient9501 {
    public static void main(String[] args) {
        SpringApplication.run(ConfigClient9501.class, args);
    }

    @Value("${name}")
    String name;
    @GetMapping("/hi")
    public String hello() {
        return "hello, " + name;
    }
}

You may encounter a prompt here that the placeholder ${name} cannot be found. It must be that the steps have not been followed

test

Note that there is no name variable in the above client configuration file

The items on the server do not need to be stopped and then openedconfig-client9501Project. The open projects are as follows

Visit belowlocalhost:9501/hi, you can see the following under normal conditions

In fact, I have taken quite a lot of spare time to write, but sometimes when I encounter some problems, I still need to understand them as much as possible and then speak them out in a simple way. I hope I can help you to read this article!!!

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