SpringCloud Alibaba Nacos入门

改了很多都被占用
63 阅读2分钟

1. 首先创建父子工程，其中父工程的pom.xml如下：

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.cxd.study.demo.springboot</groupId>
    <artifactId>nacos</artifactId>
    <packaging>pom</packaging>
    <version>1.0</version>
    <modules>
        <module>server</module>
        <module>client1</module>
        <module>client2</module>
    </modules>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>

        <spring.boot.version>2.6.3</spring.boot.version>
        <spring.cloud.version>2021.0.1</spring.cloud.version>
        <spring.cloud.alibaba.version>2021.0.1.0</spring.cloud.alibaba.version>

    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</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>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>

    </dependencyManagement>

</project>

服务注册方：

pom.xml配置文件

<?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</artifactId>
        <groupId>cn.cxd.study.demo.springboot</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>client</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

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

</project>

bootstrp.yml配置文件

spring:
  application:
    name: nacos-server-provider
  cloud:
      nacos:
        discovery:
          server-addr: 127.0.0.1:8848
server:
  port: 11000

启动类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class ClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(ClientApplication.class, args);
    }
}

controller

import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class TestController {

    @Resource
    private Environment environment;

    @RequestMapping("test")
    public String test() {
        return "Msg from " + environment.getProperty("local.server.port");
    }
}

服务消费方

pom.xml配置文件

<?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</artifactId>
        <groupId>cn.cxd.study.demo.springboot</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>server</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

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

</project>

bootstrap.yml配置文件

spring:
  application:
    name: nacos-server-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
server:
  port: 21000

启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(NacosServerApplication.class, args);
    }
}

配置类

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class Conf {

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

controller

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
public class TestController {

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("test1")
    public String test1() {
        ResponseEntity<String> entity = restTemplate.getForEntity("http://nacos-server-provider/test", String.class);
        return entity.getBody();
    }
}

说明：

再启动一个客户端，把端口改一下即可。

注册情况查看

image.png image.png

服务调用

image.png image.png

nacos的心跳机制

  • 5S：nacos客户端启动后，会每隔5S向服务端发送一个心跳包，里面包含自己的基本信息。服务端收到后，检测该客户端有没注册，如果没注册则注册，注册了则证明该节点健康。
  • 15S：如果服务端15S还没有收到客户端的心跳信息，则将该节点标记为不健康。
  • 30S：如果30S还没有收到客户端的心跳信息，则将该节点剔除。
  • 以上时间都是默认，不过也可以修改。

服务上下线实验结果

上下线下线上线
web等15S钟才正式下线，停止服务。会等15S钟才正式上线，提供服务。
直接停服在web处会等15S钟才正式下线，停止服务，期间若有请求发送到节点会超时在web处会直接上线，提供服务。
直接kill掉nacos，服务一直可用。

Springboot/SpringCloud/SpringCloudAlibaba版本匹配

GitHub链接

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