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语言/Java/springcloud.md

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+## Nacos
+
+在bin包下
+
+输入
+
+```cmd
+startup.cmd -m standalone
+就可以启动nacos服务
+在http://localhost:8848/nacos下
+```
+
+## @EnableDiscoveryClient
+
+在主类上卖弄使用这个注解 可以使服务发现
+
+都是能够让**注册中心**能够发现，扫描到该服务。
+
+## DiscoveryClient discoveryClient;
+
+在discoveryClient可以得到
+
+```java
+@SpringBootTest
+public class ProductApplicationTest {
+    @Autowired
+    DiscoveryClient discoveryClient;//nacos
+    @Autowired
+    NacosDiscoveryClient nacosDiscoveryClient;//二者效果一样，这个依赖nacos 只能由nacos使用
+
+    @Test
+    public void discoveryClientTest(){
+        List<String> services = discoveryClient.getServices();//注册中心的微服务
+        for (String service : services) {
+            System.out.println("service = " + service);
+            List<ServiceInstance> instances = discoveryClient.getInstances(service);//获得服务的实例List
+            for (ServiceInstance instance : instances) {
+                System.out.println("instance.getHost() = " + instance.getHost());//获得ip地址 和端口列表
+                System.out.println("instance.getPort() = " + instance.getPort());
+            }
+        }
+    }
+
+    @Test
+    public void nacosDiscoveryClientTest(){
+        List<String> services = nacosDiscoveryClient.getServices();
+        for (String service : services) {
+            System.out.println("service = " + service);
+            List<ServiceInstance> instances = nacosDiscoveryClient.getInstances(service);
+            for (ServiceInstance instance : instances) {
+                System.out.println("instance.getHost() = " + instance.getHost());
+                System.out.println("instance.getPort() = " + instance.getPort());
+            }
+        }
+    }
+}
+
+```
+
+
+
+
+
+## @RestController
+
+@RestController下的方法默认返回的是数据格式
+
+ 简而言之，`@RestController` 适用于构建 RESTful 风格的 API，其中每个方法的返回值会直接序列化为** JSON 或 XML** 数据并发送给客户端。
+
+，@Controller注解标注的类下面的方法默认返回的就是以视图为格式
+
+
+
+## RestTemplate
+
+```java
+restTemplate.getForObject(url, Product.class);
+```
+