80 lines
2.2 KiB
Markdown
80 lines
2.2 KiB
Markdown
## Nacos
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在bin包下
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输入
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```cmd
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startup.cmd -m standalone
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就可以启动nacos服务
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在http://localhost:8848/nacos下
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```
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## @EnableDiscoveryClient
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在主类上卖弄使用这个注解 可以使服务发现
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都是能够让**注册中心**能够发现，扫描到该服务。
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## DiscoveryClient discoveryClient;
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在discoveryClient可以得到
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```java
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@SpringBootTest
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public class ProductApplicationTest {
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@Autowired
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DiscoveryClient discoveryClient;//nacos
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@Autowired
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NacosDiscoveryClient nacosDiscoveryClient;//二者效果一样，这个依赖nacos 只能由nacos使用
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@Test
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public void discoveryClientTest(){
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List<String> services = discoveryClient.getServices();//注册中心的微服务
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for (String service : services) {
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System.out.println("service = " + service);
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List<ServiceInstance> instances = discoveryClient.getInstances(service);//获得服务的实例List
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for (ServiceInstance instance : instances) {
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System.out.println("instance.getHost() = " + instance.getHost());//获得ip地址 和端口列表
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System.out.println("instance.getPort() = " + instance.getPort());
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}
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}
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}
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@Test
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public void nacosDiscoveryClientTest(){
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List<String> services = nacosDiscoveryClient.getServices();
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for (String service : services) {
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System.out.println("service = " + service);
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List<ServiceInstance> instances = nacosDiscoveryClient.getInstances(service);
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for (ServiceInstance instance : instances) {
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System.out.println("instance.getHost() = " + instance.getHost());
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System.out.println("instance.getPort() = " + instance.getPort());
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}
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}
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}
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}
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```
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## @RestController
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@RestController下的方法默认返回的是数据格式
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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。
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，@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
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## RestTemplate
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```java
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restTemplate.getForObject(url, Product.class);
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```
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