注册中心(nacos)
一、版本管理
- Spring Boot 2.2.5.RELEASE
- Spring Cloud Hoxton.SR3
- Spring Cloud Alibaba 2.2.1.RELEASE
二、依赖引入
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR3</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.2.1.RELEASE</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>
</dependencies>
</dependencyManagement>
三、接入项目
1、注册中心依赖
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
2、bootstrap.properties
spring.cloud.nacos.server-addr=127.0.0.1:8848
spring.application.name=test-demo
有时新建的properties文件会图标异常,配置没有提示。
IntelliJ IDEA按一下步骤操作:
- File ==> Project Settings ==> Modules ==> Spring
- 点击右侧上方的绿色图标(Spring的icon)
- 点击“+”号
- 选择文件后,一路“OK”即可。
3、application.yml
spring:
cloud:
nacos:
config:
server-addr: 127.0.0.1:8848 # nacos-server 地址
application:
# 项目名称
name: test-demo # 项目名称
4、启动类配置
@SpringBootApplication
// @EnableDiscoveryClient注解开启服务注册与发现功能
@EnableDiscoveryClient
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
四、OpenFeign
1、引入open-feign
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
2、启动类
@SpringBootApplication
// Feign扫描的包路径
@EnableFeignClients(basePackages = "xxx.xxx.xxx")
public class MyApplication {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
3、service
// test-demo为想要调用接口在注册中心中的名称
@FeignClient("test-demo")
public interface DemoService {
// 此处路径要写全。比如调用接口的请求路径为/demo/show,此处也为/demo/show
@RequestMapping("/demo/show")
public String show();
}
4、controller
@Controller
public class DemoController {
// 正常注入即可
@Autowired
DemoService demoService;
@RequestMapping("/hello")
public String helloName() {
return demoService.show();
}
}