读取nacos的配置

1.开发环境

java:17
springboot:2.7.5
springcloud:2021.0.4
springcloudalibaba:2021.0.4.0

2.maven依赖

<properties>
    <java.version>17</java.version>
    <spring-cloud-alibaba.version>2021.0.4.0</spring-cloud-alibaba.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>${spring-cloud-alibaba.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <excludes>
                    <exclude>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                    </exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

3.application.properties配置参数

server.port=9010
spring.application.name=ts-1
spring.cloud.nacos.config.group=DEFAULT_GROUP
spring.cloud.nacos.config.server-addr=10.21.10.8:8848
spring.config.import=optional:nacos:test.yml

4.编写nacos参数读取类

package com.example.kc1.config;

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@ConfigurationProperties(prefix = "configdata.user")
public class UserConfig {
    private String name;
    private Integer age;
}

5.nacos上新增test.yml配置文件，格式yaml

configdata:
        user:
            age: 21
            name: freeman

6.启动类添加注解

@SpringBootApplication
@ConfigurationPropertiesScan("com.example.kc1.config")
public class Kc1Application {

    public static void main(String[] args) {
        SpringApplication.run(Kc1Application.class, args);
    }

}

7.使用

@RestController
@RequiredArgsConstructor
public class NacosController {
    private final UserConfig userConfig;

    @GetMapping("/user")
    public ResponseEntity getUser(){
        return ResponseEntity.ok("hi,"+userConfig.getName());
    }
}

参考文献：

Configuration Metadata
https://www.baeldung.com/configuration-properties-in-spring-boot
https://github.com/alibaba/spring-cloud-alibaba/tree/2021.x/spring-cloud-alibaba-examples/nacos-example/nacos-config-2.4.x-example