保姆教程系列二、Nacos实现注册中心
前言:
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上篇我们介绍到 保姆教程系列一、Linux搭建Nacos
注册中心原理
一、环境准备
- Java版本:1.8+ (Linux centos7虚拟机下安装Jdk1.8)
- MySQL服务:5.6.5+ (Linux Centos7 安装MySQL5.7 图文详解)
二、创建项目
2.1 创建项目父工程
IDEA中创建聚合项目nacos作为父工程,其pom.xml如下
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"\>
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.3.RELEASE</version>
</parent>
<groupId\>com.example</groupId\>
<artifactId\>nacos</artifactId\>
<version\>0.0.1</version\>
<name\>nacos</name\>
<description\>Spring Cloud Nacos</description\>
<properties\>
<java.version\>1.8</java.version\>
</properties\>
<!--引入子模块\-->
<modules\>
<module\>provider</module\><!--生产者\-->
<module\>consumer</module\><!--消费者\-->
</modules\>
<dependencies\>
<!--web依赖\-->
<dependency\>
<groupId\>org.springframework.boot</groupId\>
<artifactId\>spring-boot-starter-web</artifactId\>
</dependency\>
<!--测试依赖\-->
<dependency\>
<groupId\>org.springframework.boot</groupId\>
<artifactId\>spring-boot-starter-test</artifactId\>
<scope\>test</scope\>
</dependency\>
<!--nacos配置中心依赖\-->
<dependency\>
<groupId\>com.alibaba.cloud</groupId\>
<artifactId\>spring-cloud-starter-alibaba-nacos-config</artifactId\>
<version\>2.1.1.RELEASE</version\>
</dependency\>
<!--nacos配置中心依赖\-->
<!--<dependency>\-->
<!--<groupId>org.springframework.cloud</groupId>\-->
<!--<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>\-->
<!--<version>0.2.1.RELEASE</version>\-->
<!--</dependency>\-->
<!--lombok依赖\-->
<dependency\>
<groupId\>org.projectlombok</groupId\>
<artifactId\>lombok</artifactId\>
<optional\>true</optional\>
</dependency\>
<!--注册中心依赖\-->
<dependency\>
<groupId\>org.springframework.cloud</groupId\>
<artifactId\>spring-cloud-starter-alibaba-nacos-discovery</artifactId\>
<version\>0.2.2.RELEASE</version\>
</dependency\>
</dependencies\>
<build\>
<plugins\>
<plugin\>
<groupId\>org.springframework.boot</groupId\>
<artifactId\>spring-boot-maven-plugin</artifactId\>
</plugin\>
</plugins\>
</build\>
<dependencyManagement\>
<dependencies\>
<dependency\>
<groupId\>org.springframework.cloud</groupId\>
<artifactId\>spring-cloud-dependencies</artifactId\>
<version\>Greenwich.SR2</version\>
<type\>pom</type\>
<scope\>import</scope\>
</dependency\>
</dependencies\>
</dependencyManagement\>
</project>
2.2 创建Provider服务生产者
在父工程Nacos下创建springboot子工程provider,其pom.xml文件为:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"\>
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.example</groupId>
<artifactId>nacos</artifactId>
<version>0.0.1</version>
</parent>
<groupId\>com.example</groupId\>
<artifactId\>provider</artifactId\>
<version\>0.0.1</version\>
<name\>provider</name\>
<description\>Provider Nacos</description\>
<properties\>
<java.version\>1.8</java.version\>
</properties\>
<dependencies\>
<!--lombok依赖\-->
<dependency\>
<groupId\>org.projectlombok</groupId\>
<artifactId\>lombok</artifactId\>
<optional\>true</optional\>
</dependency\>
</dependencies\>
<build\>
<plugins\>
<plugin\>
<groupId\>org.springframework.boot</groupId\>
<artifactId\>spring-boot-maven-plugin</artifactId\>
</plugin\>
</plugins\>
</build\>
</project>
在启动类ProviderApplication.java中增加**@EnableDiscoveryClient**注解
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient//开启注册
public class ProviderApplication {
public static void main(String\[\] args) {
SpringApplication.run(ProviderApplication.class, args);
}
}
配置文件application.yml进行如下配置
#生产者配置
server:
port: 8081
spring:
application:
name: nacos-provider #服务名称
cloud:
nacos:
discovery: #使用注册中心
server-addr: 192.168.36.135:8848 #Nacos访问地址
enabled: true
在服务提供方创建一个对外接口
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RequestMapping(“/provider”)
@RestController
public class IndexController {
@GetMapping("/hello")
public String hello() {
return "我是provider服务生产者";
}
}
2.3 创建Consumer服务消费者
在父工程Nacos下创建springboot子工程consumer,其pom.xml文件为:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"\>
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.example</groupId>
<artifactId>nacos</artifactId>
<version>0.0.1</version>
</parent>
<groupId\>com.example</groupId\>
<artifactId\>consumer</artifactId\>
<version\>0.0.1</version\>
<name\>consumer</name\>
<description\>Consumer Nacos</description\>
<properties\>
<java.version\>1.8</java.version\>
</properties\>
<dependencies\>
<!--feign依赖\-->
<dependency\>
<groupId\>org.springframework.cloud</groupId\>
<artifactId\>spring-cloud-starter-openfeign</artifactId\>
</dependency\>
<!--hystrix断路器\-->
<dependency\>
<groupId\>org.springframework.cloud</groupId\>
<artifactId\>spring-cloud-starter-netflix-hystrix</artifactId\>
</dependency\>
</dependencies\>
<build\>
<plugins\>
<plugin\>
<groupId\>org.springframework.boot</groupId\>
<artifactId\>spring-boot-maven-plugin</artifactId\>
</plugin\>
</plugins\>
</build\>
</project>
在启动类ConsumerApplication.java中增加注解
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient //开启注册
@EnableFeignClients //开启Feign服务
public class ConsumerApplication {
public static void main(String\[\] args) {
SpringApplication.run(ConsumerApplication.class, args);
}
}
配置文件application.yml进行如下配置
#消费者配置
server:
port: 8082
spring:
application:
name: nacos-consumer
cloud:
nacos:
discovery: #使用注册中心
server-addr: 192.168.36.135:8848
enabled: true
#开启断路器
feign:
hystrix:
enabled: true
使用FeginClient进行服务调用,hystrix进行熔断
import com.example.consumer.hystrix.HystrixUtils;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
@FeignClient(name = “nacos-provider”,fallback = HystrixUtils.class)//服务出现异常进行容错
public interface ProviderFeignClient {
/\*\*
\* .
\* 调用生产者服务
\* @return
\*/
@GetMapping("/provider/hello")
String hello();
}
HystrixUtils.class容错类
import com.example.consumer.client.ProviderFeignClient;
import org.springframework.stereotype.Component;
@Component
public class HystrixUtils implements ProviderFeignClient {
/\*\*
\* .
\* 方法重写
\*
\* @return
\*/
@Override
public String hello() {
return "断路器容错,服务开小差了,稍等片刻...";
}
}
service层服务调用
import com.example.consumer.client.ProviderFeignClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class IndexService {
@Autowired
private ProviderFeignClient client; //注入
public String hello() {
return client.hello(); // 服务调用
}
}
在controller中调用service的接口,像一般的接口调用一样
import com.example.consumer.service.IndexService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RequestMapping(“/consumer”)
@RestController
public class IndexController {
@Autowired
private IndexService service;
@GetMapping("/hello")
public String hello(){
return service.hello();
}
}
三、服务调用测试
3.1 项目启动
启动完成后,在服务提供者和消费者的日志中应该可以分别看到如下信息
INFO 18388 — [ main] o.s.c.a.n.registry.NacosServiceRegistry : nacos registry, nacos-provider 192.168.22.1:8081 register finished
3.2 登录Nacos控制台
你会发现服务列表中,已经显示了我们刚才创建的两个项目,并可以对其进行简单的监控和管理。
3.3 使用样例项目
打开浏览器输入:http://localhost:8082/consumer/hello
Nacos服务发现与Eureak服务发现无差异
敬请关注下篇 保姆教程系列三、Nacos Config–服务配置中心
总结:
我是南国以南i记录点滴每天成长一点点,学习是永无止境的!转载请附原文链接!!!