服务注册实例

架构图：

provider应用将自己的信息注册到nacos中
consumer应用从nacos中获取到provider应用的信息
consumer直接调用provider对外提供的接口

项目结构：

项目中主要包含三个文件：

pom.xml
NacosProviderApplication.java
application.properties

pom.xml

<?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>
        <artifactId>nacos-spring-cloud-discovery-example</artifactId>
        <groupId>com.alibaba.nacos</groupId>
        <version>0.2.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>nacos-spring-cloud-provider-example</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

NacosProviderApplication.java

package com.alibaba.nacos.example.spring.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderApplication {

   public static void main(String[] args) {
      SpringApplication.run(NacosProviderApplication.class, args);
   }

   @RestController
   class EchoController {
      @RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
      public String echo(@PathVariable String string) {
         return "Hello Nacos Discovery " + string;
      }
   }
}

application.properties

// 监听端口
server.port=1919
// 服务名为“service-provider”
spring.application.name=service-provider
// 注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

测试方式一：
若项目启动后，控制台出现以下输出，则表示注册成功

2019-05-21 10:27:03.571  INFO 7888 --- [           main] o.s.c.a.n.registry.NacosServiceRegistry  : nacos registry, service-provider 192.168.43.248:18080 register finished

测试方式二：
登录nacos查询已注册的服务

两种服务消费方式

RestTemplet

使用RestTemplet能够方便的使用REST资源
以下为RestTemplet消费服务的代码：
pom.xml

<?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>
        <artifactId>nacos-spring-cloud-discovery-example</artifactId>
        <groupId>com.alibaba.nacos</groupId>
        <version>0.2.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>nacos-spring-cloud-consumer-example</artifactId>

    <properties>
        <spring-cloud-openfeign.version>2.0.0.RELEASE</spring-cloud-openfeign.version>
        <spring-cloud-netflix.version>2.0.0.RELEASE</spring-cloud-netflix.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>${spring-cloud-netflix.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>${spring-cloud-openfeign.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

NacosConsumerApplication.java

package com.alibaba.nacos.example.spring.cloud;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;


@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(NacosConsumerApplication.class, args);
    }

    @RestController
    public class TestController {

        private final RestTemplate restTemplate;

        @Autowired
        public TestController(RestTemplate restTemplate) {this.restTemplate = restTemplate;}

        @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
        public String echo(@PathVariable String str) {
            return restTemplate.getForObject("http://service-provider/echo/" + str, String.class);
        }
    }
}

application.properties

// 监听端口
server.port=1929
// 服务名
spring.application.name=service-consumer
// 注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

Feign

相较restTrmplet，Feign使用@FeignClient注解来指定接口，接口中定义的函数可以通过Spring MVC的注解来绑定服务提供方的REST接口。需要消费服务时，只需要直接调用对应方法即可。
以下为Feign消费服务的代码：
pom.xml

<?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>
        <artifactId>nacos-spring-cloud-discovery-example</artifactId>
        <groupId>com.alibaba.nacos</groupId>
        <version>0.2.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>nacos-spring-cloud-consumer-example</artifactId>

    <properties>
        <spring-cloud-openfeign.version>2.0.0.RELEASE</spring-cloud-openfeign.version>
        <spring-cloud-netflix.version>2.0.0.RELEASE</spring-cloud-netflix.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>${spring-cloud-netflix.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>${spring-cloud-openfeign.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

NacosConsumerApplication.java

package com.alibaba.nacos.example.spring.cloud;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class NacosConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosConsumerApplication.class, args);
    }

    @RestController
    public class TestController {

        @Autowired
        Client client;

        @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
        public String echo(@PathVariable String str) {
            return client.hello(str);
        }
    }

    @FeignClient("service-provider")
    interface Client{
        @GetMapping(value="/echo/{str}")
        String hello(@PathVariable("str") String str);
    }
}

application.properties

// 监听端口
server.port=1929
// 服务名
spring.application.name=service-consumer
// 注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

测试

测试地址：http://localhost:1929/echo/daa
预期返回结果：Hello Nacos Discovery daa(消费成功)

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私信关注

Nacos三：服务注册与两种消费方式

服务注册实例

两种服务消费方式

RestTemplet

Feign

测试

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