Examples of service registration

Chart:

provider applications will register their information in the nacos
consumer application to obtain the information from nacos provider of application
consumer direct call interface provided by the external provider

Project structure:

The main project consists of three files:

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

Test Method 1:
After If the project starts, the following console output, then the registration is successful

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

Test way:
Log nacos queries registered service

Both services consumption

RestTemplet

Use RestTemplet can easily use REST resource
codes Following is RestTemplet consumer services:
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

Compared restTrmplet, Feign use @FeignClient annotation to specify the interface functions defined in the interface can be binding service provides a REST interface side by Spring MVC annotations. Consumer services when needed, just call directly to the corresponding method.
The following is the code Feign consumer services:
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

test

Test Address: HTTP: // localhost: 1929 / echo / daa
expected return result: Hello Nacos Discovery daa (consumer success)

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Private letter concerns

Nacos three: service registration and Two consumption

Examples of service registration

Both services consumption

RestTemplet

Feign

test

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