Nacos注册中心实现远程服务调用教程

目录

1. 服务调用图解

 2.父工程创建(01-sca)

3.生产者module创建--(sca-provider)

3.1.创建并修改application.yml(sca-provider生产者的)实现服务注册

3.2.在sca-provider中创建启动类ProviderApplication

3.3.启动nacos服务

 3.4.打开浏览器,输入http://localhost:8081/provider/echo/msa,然后进行访问

4.消费者module创建(sca-consumer)

4.1修改pom.xml文件

4.2 创建并修改配置文件application.yml

4.3创建启动类实现消费者服务

4.4启动消费者服务

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1. 服务调用图解

说明:创建一个父工程(聚合工程),在父工程下创建两个module,分别为sca-producer(生产者)和

sca-consumer(消费者),生产者和消费者都要注册(register)到nacos服务中心,然后生产者可以给消费者提供远程调用服务.如图

 2.父工程创建(01-sca)

pom.xml文件的依赖如下:

<?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>com.jt</groupId>
    <artifactId>01-sca</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>sca-provider</module>
        <module>sca-consumer</module>
    </modules>
    <!--工程中默认定义的或自己定义的属性,例如一些版本信息-->
    <properties>
        <spring.boot.version>2.3.2.RELEASE</spring.boot.version>
        <spring.cloud.version>Hoxton.SR9</spring.cloud.version>
        <spring.cloud.alibaba.version>2.2.6.RELEASE</spring.cloud.alibaba.version>
    </properties>
    <!--dependencyManagement元素用于定义核心依赖的管理,例如依赖的版本-->
    <dependencyManagement>
        <dependencies>

            <!--Spring boot 依赖(微服务基础)-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <!--这里的import表示在其它工程中需要时直接可以引用-->
                <scope>import</scope>
                <!--假如依赖的scope属性值为scope,则type类型必须为pom-->
                <type>pom</type>
            </dependency>
            <!--Spring Cloud 依赖(定义了微服务规范)-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
            <!--Spring Cloud Alibaba依赖(基于spring微服务规范做了具体落地实现)-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

3.生产者module创建--(sca-provider)

        pom.xml文件的依赖关系如下:

<?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">
    <parent>
        <artifactId>01-sca</artifactId>
        <groupId>com.jt</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jt</groupId>
    <artifactId>sca-provider</artifactId>
    <dependencies>
        <!--Web服务-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--服务的注册和发现(我们要讲服务注册到nacos)-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

</project>

3.1.创建并修改application.yml(sca-provider生产者的)实现服务注册

server:
  port: 8081
spring:
  application:
    name: sca-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

注意:服务名不要用"_",要用"-".

3.2.在sca-provider中创建启动类ProviderApplication

@SpringBootApplication
public class ProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProviderApplication.class, args);
    }
    @RestController
   public class ProviderController{
        @Value("${server.port:8080}")
        private String server;
       @GetMapping("/provider/echo/{msg}")
       public String doRestEcho01(@PathVariable String msg)
               throws InterruptedException {
           Thread.sleep(50000);
           return server+"say hello"+msg;
       }
   }
}

3.3.启动nacos服务

在bin的根目录启动命令窗口,然后输入startup -m standalone 命令启动服务,这里用standalone就不必配置环境变量,否则启动时报错.

 3.4.打开浏览器,输入http://localhost:8081/provider/echo/msa,然后进行访问

说明:出现如下图则证明服务已经成功注册到nacos中.

 

4.消费者module创建(sca-consumer)

4.1修改pom.xml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>01-sca</artifactId>
        <groupId>com.jt</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jt</groupId>
    <artifactId>sca-consumer</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <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>

</project>

4.2 创建并修改配置文件application.yml

server:
  port: 8090
spring:
  application:
    name: sca-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

#ribbon:
  #ReadTimeout: 500000
feign:
  hystrix:
    enabled: true #默认值为false

4.3创建启动类实现消费者服务

package com.cy;
@SpringBootApplication
public class ConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class,args);
    }
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
    @RestController
    public class ConsumerController{

        @Value("${spring.application.name}")
        private String appName;
        @Autowired
        private RestTemplate restTemplate;
        @GetMapping("/consumer/doRestEcho1")
        public String doRestEcho01(){
            String url = "http://localhost:8081/provider/echo/"+appName;
            System.out.println("request url:"+url);
           return restTemplate.getForObject(url, String.class);
        }
    }
}

4.4启动消费者服务

在浏览器输入http://localhost:8090/consumer/doRestEcho1地址进行访问，假如访问成功会出现，如图所示效果：