Feign测试

changelog.md

@@ -912,7 +912,7 @@ public class RibbonLoadBalancerClient implements LoadBalancerClient {
 }
 ```
 
-- reconstructURI方法，重建请求URI，将服务名称替换为服务实例的IP:端口，例如http://provider-application/echo被重建为http://192.168.100.1:8888/echo
+- reconstructURI方法，重建请求URI，将服务名称替换为服务实例的IP:端口，例如```http://provider-application/echo``` 被重建为```http://192.168.100.1:8888/echo```
 - execute方法，处理http请求
 
 有了RibbonLoadBalancerClient的reconstructURI和execute方法，将所有http请求委托给RibbonLoadBalancerClient即可。其实spring-cloud-commons已经帮我们配置好拦截RestTemplate的http请求委托给RibbonLoadBalancerClient的拦截器LoadBalancerInterceptor，配置类如下:

mini-spring-cloud-examples/mini-spring-cloud-consumer-examples/pom.xml

@@ -18,6 +18,12 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>com.github</groupId>
             <artifactId>mini-spring-cloud-tutu-discovery</artifactId>
@@ -27,6 +33,19 @@
             <groupId>com.github</groupId>
             <artifactId>mini-spring-cloud-load-balancer</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>io.github.openfeign</groupId>
+            <artifactId>feign-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-feign</artifactId>
+            <version>1.4.7.RELEASE</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

mini-spring-cloud-examples/mini-spring-cloud-consumer-examples/src/test/java/com/github/cloud/examples/FeignTest.java

@@ -0,0 +1,52 @@
+package com.github.cloud.examples;
+
+import feign.Feign;
+import feign.RequestLine;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.cloud.openfeign.support.SpringMvcContract;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author derek(易仁川)
+ * @date 2022/3/27
+ */
+public class FeignTest {
+    private static Logger logger = LoggerFactory.getLogger(FeignTest.class);
+
+    interface HelloService {
+
+        @RequestLine("GET /hello")
+        String hello();
+    }
+
+    @Test
+    public void testOpenFeign() {
+        HelloService helloService = Feign.builder()
+                .target(HelloService.class, "http://localhost:8080");
+        String response = helloService.hello();
+        logger.info("response: {}", response);
+        boolean succ = response.startsWith("Port of the service provider");
+        assertThat(succ).isTrue();
+    }
+
+    interface WorldService {
+
+        @GetMapping("/world")
+        String world();
+    }
+
+    @Test
+    public void testSpringCloudOpenFeign() {
+        WorldService worldService = Feign.builder()
+                .contract(new SpringMvcContract())
+                .target(WorldService.class, "http://localhost:8080");
+        String response = worldService.world();
+        logger.info("response: {}", response);
+        boolean succ = response.startsWith("Port of the service provider");
+        assertThat(succ).isTrue();
+    }
+}