nacos 注册中心示例

lab-44/lab-44-nacos-discovery-demo/pom.xml

@@ -0,0 +1,30 @@
+<?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>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.2.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-44-nacos-discovery-demo</artifactId>
+
+    <dependencies>
+        <!-- 实现对 SpringMVC 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 实现对 Nacos 作为注册中心的自动化配置 -->
+        <dependency>
+            <groupId>com.alibaba.boot</groupId>
+            <artifactId>nacos-discovery-spring-boot-starter</artifactId>
+            <version>0.2.4</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-44/lab-44-nacos-discovery-demo/src/main/java/cn/iocoder/springboot/lab44/nacosdemo/Application.java

@@ -0,0 +1,13 @@
+package cn.iocoder.springboot.lab44.nacosdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

lab-44/lab-44-nacos-discovery-demo/src/main/java/cn/iocoder/springboot/lab44/nacosdemo/controller/DemoController.java

@@ -0,0 +1,40 @@
+package cn.iocoder.springboot.lab44.nacosdemo.controller;
+
+import com.alibaba.nacos.api.annotation.NacosInjected;
+import com.alibaba.nacos.api.exception.NacosException;
+import com.alibaba.nacos.api.naming.NamingService;
+import com.alibaba.nacos.api.naming.pojo.Instance;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/demo")
+public class DemoController {
+
+    @NacosInjected
+    private NamingService namingService;
+
+    private RestTemplate restTemplate = new RestTemplate();
+
+    @GetMapping("/provider")
+    public String provider() {
+        return "echo";
+    }
+
+    @GetMapping("/consumer")
+    public String consumer() throws IllegalStateException, NacosException {
+        // 获得实例
+        List<Instance> instances = namingService.getAllInstances("demo-application");
+        // 获得首个实例，进行调用
+        Instance instance = instances.stream().findFirst()
+                .orElseThrow(() -> new IllegalStateException("未找到对应的 Instance"));
+        // 执行请求
+        return restTemplate.getForObject("http://" + instance.toInetAddr() + "/demo/provider",
+                String.class);
+    }
+
+}

lab-44/lab-44-nacos-discovery-demo/src/main/resources/application.yaml

@@ -0,0 +1,12 @@
+spring:
+  application:
+    name: demo-application # 应用名
+
+nacos:
+  discovery:
+    server-addr: 127.0.0.1:18848 # Nacos 服务器地址
+    auto-register: true # 是否自动注册到 Nacos 中。默认为 false。
+    namespace: # 使用的 Nacos 的命名空间，默认为 null。
+    register:
+      group-name: DEFAULT_GROUP # 使用的 Nacos 服务分组，默认为 DEFAULT_GROUP。
+      cluster-name: cluster01 # 集群名，默认为空。

lab-44/pom.xml

@@ -18,6 +18,7 @@
         <module>lab-44-nacos-config-demo-jasypt</module>
         <module>lab-44-nacos-config-demo-actuator</module>
         <module>lab-44-nacos-config-demo-multi</module>
+        <module>lab-44-nacos-discovery-demo</module>
     </modules>