✨ 远程配置读取

cloud-demo/ReadMe.md

@@ -405,3 +405,112 @@ private Product getProductFromRemoteWithLoadBalancerAnnotation(Long productId) {
     return restTemplate.getForObject(url, Product.class);
 }
 ```
+
+### 远程配置读取
+
+#### 1、引入依赖
+
+```xml
+<dependency>
+    <groupId>com.alibaba.cloud</groupId>
+    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
+</dependency>
+```
+
+#### 2、在nacos中配置
+
+![image-20250526152842107](./images/image-20250526152842107.png)
+
+![image-20250526152904745](./images/image-20250526152904745.png)
+
+```yml
+order:
+  timeout: 30min
+  auto-confirm: true
+```
+
+#### 3、创建接口访问
+
+```java
+@RestController
+@RequestMapping("/api/order")
+@RequiredArgsConstructor
+public class OrderController {
+
+    private final OrderService orderService;
+
+    @Value("${order.timeout}")
+    private String timeout;
+
+    @Value("${order.auto-confirm}")
+    private String autoConfirm;
+
+    @Operation(summary = "读取配置")
+    @GetMapping("config")
+    public String config() {
+        return "timeout：" + timeout + "\nautoConfirm：" + autoConfirm;
+    }
+}
+```
+
+#### 4、SpringBoot中配置
+
+> [!CAUTION]
+>
+> 需要注意的是，不要在`server-addr`地址中写`${nacos.server-addr}`，否则无法访问正确的地址。
+
+> [!NOTE]
+>
+> 如果某个项目模块暂时不需要动态配置，但是引入了，可以在配置中加上，导入检查。
+>
+> ```yaml
+> cloud:
+>   nacos:
+>     server-addr: 192.168.95.135:8848
+>     config:
+>       import-check:
+>         enabled: false
+> ```
+>
+> 如果某个配置是可选也可以在前面加上`ptional:`。
+>
+> ```yaml
+> spring:
+>   config:
+>     import:
+>       - optional:nacos:service-order.yml
+> ```
+
+```yaml
+server:
+  port: 8000
+spring:
+  application:
+    name: service-order
+  profiles:
+    active: dev
+  config:
+    import:
+      - nacos:service-order.yml
+  cloud:
+    nacos:
+      server-addr: 192.168.95.135:8848
+      config:
+        import-check:
+          enabled: false
+```
+
+#### 5、动态刷新读取
+
+如果需要动态刷新需要在控制器或者是启动类上加上`@RefreshScope`
+
+```java
+@SpringBootApplication
+@EnableDiscoveryClient
+@RefreshScope
+public class ProductServiceApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(ProductServiceApplication.class, args);
+    }
+}
+```

cloud-demo/services/pom.xml

@@ -64,6 +64,10 @@
             <groupId>com.alibaba.cloud</groupId>
             <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-openfeign</artifactId>

cloud-demo/services/service-order/src/main/java/cn/bunny/service/OrderServiceApplication.java

@@ -3,9 +3,11 @@ package cn.bunny.service;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.context.config.annotation.RefreshScope;
 
 @SpringBootApplication
 @EnableDiscoveryClient
+@RefreshScope
 public class OrderServiceApplication {
     public static void main(String[] args) {
         SpringApplication.run(OrderServiceApplication.class, args);

cloud-demo/services/service-order/src/main/java/cn/bunny/service/controller/OrderController.java

@@ -4,6 +4,7 @@ import cn.bunny.model.order.bean.Order;
 import cn.bunny.service.service.OrderService;
 import io.swagger.v3.oas.annotations.Operation;
 import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -15,9 +16,21 @@ public class OrderController {
 
     private final OrderService orderService;
 
+    @Value("${order.timeout}")
+    private String timeout;
+
+    @Value("${order.auto-confirm}")
+    private String autoConfirm;
+
     @Operation(summary = "创建订单")
     @GetMapping("create")
     public Order createOrder(Long userId, Long productId) {
         return orderService.createOrder(productId, userId);
     }
+
+    @Operation(summary = "读取配置")
+    @GetMapping("config")
+    public String config() {
+        return "timeout：" + timeout + "\nautoConfirm：" + autoConfirm;
+    }
 }

cloud-demo/services/service-order/src/main/resources/application-dev.yaml

@@ -1,6 +1,3 @@
 server:
   port: 8000
 
-
-nacos:
-  server-addr: 192.168.95.135:8848

cloud-demo/services/service-order/src/main/resources/application.yaml

@@ -5,6 +5,12 @@ spring:
     name: service-order
   profiles:
     active: dev
+  config:
+    import:
+      - nacos:service-order.yml
   cloud:
     nacos:
-      server-addr: ${nacos.server-addr}
+      server-addr: 192.168.95.135:8848
+      config:
+        import-check:
+          enabled: false

cloud-demo/services/service-product/src/main/java/cn/bunny/service/ProductServiceApplication.java

@@ -3,9 +3,11 @@ package cn.bunny.service;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.context.config.annotation.RefreshScope;
 
 @SpringBootApplication
 @EnableDiscoveryClient
+@RefreshScope
 public class ProductServiceApplication {
     public static void main(String[] args) {
         SpringApplication.run(ProductServiceApplication.class, args);

cloud-demo/services/service-product/src/main/resources/application.yaml

@@ -5,6 +5,10 @@ spring:
     name: service-product
   profiles:
     active: dev
+
   cloud:
     nacos:
       server-addr: ${nacos.server-addr}
+      config:
+        import-check:
+          enabled: false