✨ 远程调用-声明式实现

cloud-demo/services/pom.xml

@@ -70,11 +70,11 @@
         </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-openfeign</artifactId>
+            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
+            <artifactId>spring-cloud-starter-openfeign</artifactId>
         </dependency>
 
         <!-- knife4j -->

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

@@ -8,6 +8,7 @@ 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;
+import org.springframework.cloud.openfeign.EnableFeignClients;
 import org.springframework.context.annotation.Bean;
 
 import java.util.concurrent.Executor;
@@ -16,6 +17,7 @@ import java.util.concurrent.Executors;
 @SpringBootApplication
 @EnableDiscoveryClient
 @RefreshScope
+@EnableFeignClients
 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/feign/ProductFeignClient.java

@@ -0,0 +1,17 @@
+package cn.bunny.service.feign;
+
+import cn.bunny.model.product.bean.Product;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+// Feign 客户端
+@FeignClient(value = "service-product", path = "/api/product")
+public interface ProductFeignClient {
+
+    // 标注在 Controller 上是接受请求
+    // 标注在 FeignClient 时发送请求
+    @GetMapping("{id}")
+    Product getProduct(@PathVariable("id") Long productId);
+
+}

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

@@ -2,6 +2,7 @@ package cn.bunny.service.service.impl;
 
 import cn.bunny.model.order.bean.Order;
 import cn.bunny.model.product.bean.Product;
+import cn.bunny.service.feign.ProductFeignClient;
 import cn.bunny.service.service.OrderService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -22,6 +23,7 @@ public class OrderServiceImpl implements OrderService {
     private final DiscoveryClient discoveryClient;
     private final RestTemplate restTemplate;
     private final LoadBalancerClient loadBalancerClient;
+    private final ProductFeignClient productFeignClient;
 
     /**
      * 创建订单信息
@@ -32,7 +34,8 @@ public class OrderServiceImpl implements OrderService {
      */
     @Override
     public Order createOrder(Long productId, Long userId) {
-        Product product = getProductFromRemoteWithLoadBalancerAnnotation(productId);
+        // Product product = getProductFromRemoteWithLoadBalancerAnnotation(productId);
+        Product product = productFeignClient.getProduct(productId);
 
         Order order = new Order();
         order.setId(1L);

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

@@ -5,7 +5,7 @@ spring:
   application:
     name: service-order
   profiles:
-    active: prod
+    active: dev
   cloud:
     nacos:
       server-addr: 192.168.95.135:8848