Update Nacos config docs
Freeman Lau
3 years ago
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# Nacos Config 2.4.x Example
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## Project Instruction
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Spring Boot version 2.4.0 does not start the bootstrap container by default.
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This project demonstrates how to use nacos when Spring boot >= 2.4.0 version does not enable the bootstrap container.
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***<font color=red>Applicable to Spring boot >= 2.4.0 and import the configuration using the import method, the configuration will no longer be pulled by default, and the dataId needs to be configured manually.</font>***
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## Demo
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### How to use
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1. First, modify the pom.xml file and introduce Nacos Config Starter
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>com.alibaba.cloud</groupId>
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<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
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</dependency>
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```
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2. Configure Nacos Config metadata in the application's src/main/resources/***application.yml*** configuration file
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```yaml
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server:
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port: 8888
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spring:
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application:
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name: nacos-config-import-example
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cloud:
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nacos:
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config:
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group: DEFAULT_GROUP
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server-addr: 127.0.0.1:8848
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config:
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import:
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- optional:nacos:test.yml
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- optional:nacos:test01.yml?group=group_02
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- optional:nacos:test02.yml?group=group_03&refreshEnabled=false
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```
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3. Create test.yml in nacos
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```yaml
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configdata:
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user:
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age: 21
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name: freeman
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map:
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hobbies:
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- art
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- programming
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intro: Hello, I'm freeman
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users:
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- name: dad
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age: 20
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- name: mom
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age: 18
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```
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4. After completing the above operations, the application will obtain the corresponding configuration from Nacos Config and add it to the PropertySources of Spring Environment
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```java
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// controller
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@RestController
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public class UserController {
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@Autowired
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private UserConfig userConfig;
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@GetMapping
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public String get() throws JsonProcessingException {
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return new ObjectMapper().writeValueAsString(userConfig);
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}
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}
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// ConfigurationProperties
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@ConfigurationProperties(prefix = "configdata.user")
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public class UserConfig {
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private String name;
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private Integer age;
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private Map<String, Object> map;
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private List<User> users;
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// getters and setters ...
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public static class User {
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private String name;
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private Integer age;
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// getters and setters ...
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}
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}
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```
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Verify dynamic refresh
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access http://localhost:8888
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Then modify the configuration from nacos, and visit again to verify that the dynamic configuration takes effect.
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