增加 spring cloud netflix ribbon 入门示例

labx-02/labx-02-scn-ribbon-demo05-consumer/src/main/resources/application.yaml

@@ -6,10 +6,6 @@ spring:
       # Nacos 作为注册中心的配置项，对应 NacosDiscoveryProperties 配置类
       discovery:
         server-addr: 127.0.0.1:8848 # Nacos 服务器地址
-    loadbalancer:
-      # Spring Cloud Loadbalancer 重启配置，对应 LoadBalancerRetryProperties 配置类
-      retry:
-        enabled: true # 是否开启重启，默认为 false 关闭重试。
 
 server:
   port: 28080 # 服务器端口。默认为 8080
@@ -17,7 +13,10 @@ server:
 ribbon:
 #  okhttp:
 #    enabled: true # 设置使用 OkHttp，对应 OkHttpRibbonConfiguration 配置类
-#  restclient:
-#    enabled: true # 设置使用 Jersey Client，对应 RestClientRibbonConfiguration 配置类
-  httpclient:
-    enabled: true # 设置使用 Apache HttpClient，对应 HttpClientRibbonConfiguration 配置类
+  restclient:
+    enabled: true # 设置使用 Jersey Client，对应 RestClientRibbonConfiguration 配置类
+#  httpclient:
+#    enabled: true # 设置使用 Apache HttpClient，对应 HttpClientRibbonConfiguration 配置类
+#  ConnectTimeout: 1 # 请求的连接超时时间，单位：毫秒。默认为 1000
+#  ReadTimeout: 1 # 请求的读取超时时间，单位：毫秒。默认为 1000
+

labx-02/labx-02-scn-ribbon-demo06-consumer/pom.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>labx-01</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>labx-02-scn-ribbon-demo06-consumer</artifactId>
+
+    <properties>
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
+        <spring.cloud.alibaba.version>2.2.0.RELEASE</spring.cloud.alibaba.version>
+    </properties>
+
+    <!--
+        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
+        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
+     -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring.cloud.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <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>
+
+    <dependencies>
+        <!-- 引入 SpringMVC 相关依赖，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Alibaba Nacos Discovery 相关依赖，将 Nacos 作为注册中心，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+<!--            <version>4.3.1</version>-->
+        </dependency>
+
+    </dependencies>
+
+</project>

labx-02/labx-02-scn-ribbon-demo06-consumer/src/main/java/cn/iocoder/springcloudnetflix/labx02/ribbondemo/consumer/DemoConsumerApplication.java

@@ -0,0 +1,63 @@
+package cn.iocoder.springcloudnetflix.labx02.ribbondemo.consumer;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.ServiceInstance;
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+@SpringBootApplication
+public class DemoConsumerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoConsumerApplication.class, args);
+    }
+
+    @Configuration
+    public class RestTemplateConfiguration {
+
+        @Bean
+        @LoadBalanced
+        public RestTemplate restTemplate() {
+            return new RestTemplate();
+        }
+
+    }
+
+    @RestController
+    static class TestController {
+
+        @Autowired
+        private RestTemplate restTemplate;
+        @Autowired
+        private LoadBalancerClient loadBalancerClient;
+
+        @GetMapping("/hello")
+        public String hello(String name) {
+            // 获得服务 `demo-provider` 的一个实例
+            ServiceInstance instance = loadBalancerClient.choose("demo-provider");
+            // 发起调用
+            String targetUrl = instance.getUri() + "/echo?name=" + name;
+            String response = restTemplate.getForObject(targetUrl, String.class);
+            // 返回结果
+            return "consumer:" + response;
+        }
+
+        @GetMapping("/hello02")
+        public String hello02(String name) {
+            // 直接使用 RestTemplate 调用服务 `demo-provider`
+            String targetUrl = "http://demo-provider/echo?name=" + name;
+            String response = restTemplate.getForObject(targetUrl, String.class);
+            // 返回结果
+            return "consumer:" + response;
+        }
+
+    }
+
+}

labx-02/labx-02-scn-ribbon-demo06-consumer/src/main/resources/application.yaml

@@ -0,0 +1,27 @@
+spring:
+  application:
+    name: demo-consumer # Spring 应用名
+  cloud:
+    nacos:
+      # Nacos 作为注册中心的配置项，对应 NacosDiscoveryProperties 配置类
+      discovery:
+        server-addr: 127.0.0.1:8848 # Nacos 服务器地址
+    loadbalancer:
+      # Spring Cloud Loadbalancer 重启配置，对应 LoadBalancerRetryProperties 配置类
+      retry:
+        enabled: true # 是否开启重启，默认为 false 关闭重试。
+
+server:
+  port: 28080 # 服务器端口。默认为 8080
+
+ribbon:
+  restclient:
+    enabled: true # 设置使用 Jersey Client，对应 RestClientRibbonConfiguration 配置类
+  ConnectTimeout: 1 # 请求的连接超时时间，单位：毫秒。默认为 1000
+  ReadTimeout: 1 # 请求的读取超时时间，单位：毫秒。默认为 1000
+
+user-provider:
+  ribbon:
+    OkToRetryOnAllOperations: true # 是否对所有操作都进行重试，默认为 false。
+    MaxAutoRetries: 1 # 对当前服务的重试次数，默认为 0 次。
+    MaxAutoRetriesNextServer: 2 # 重新选择服务的次数，默认为 1 次。注意，不包含第 1 次哈。

labx-02/pom.xml

@@ -22,8 +22,9 @@
 
         <module>labx-02-scn-ribbon-demo04-consumer</module>
 
-<!--        <module>labx-02-scn-ribbon-demo05-provider</module>-->
         <module>labx-02-scn-ribbon-demo05-consumer</module>
+
+        <module>labx-02-scn-ribbon-demo06-consumer</module>
     </modules>
 
 </project>