微服务-springcloud（eureka实践, nacos实践）

Spring 体系图

版本关系

eureka 实践

1 父工程依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.6.14</version>
</parent>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

2 搭建Eureka Server

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

server:
  port: 8761
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: 

3 搭建服务提供者

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:8761/eureka/

spring:
  application:
    name: eureka-provider
server:
  port: 9000

4 搭建消费者

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: eureka-consumer
server:
  port: 9001

5 服务消费方

5.1 使用RestTemplate 进行RPC调用

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

5.2 真实调用

@GetMapping("/hello/{id}")
public String hello(@PathVariable String id){
    return restTemplate.getForObject("http://EUREKA-PROVIDER/hello/"+id, String.class);
}

注意：

@LoadBalanced这个注解一定要加上(org.springframework.cloud.client.loadbalancer)

集群模式：

https://cloud.tencent.com/developer/article/1730733

Naco 实践

1 首先我们需要安装 Nacos Server
可以选用Docker
2 父POM

<parent>
  <groupId>org.springframework.bootgroupId>
  <artifactId>spring-boot-starter-parentartifactId>
  
  <version>2.4.2version>
parent>
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.alibaba.cloudgroupId>
      <artifactId>spring-cloud-alibaba-dependenciesartifactId>
      <version>2021.1version>
      <type>pomtype>
      <scope>importscope>
    dependency>
  dependencies>
dependencyManagement>

3 服务提供者

server:
  port: 8088
spring:
  application:
    name: ddd-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

<dependency>
    <groupId>com.alibaba.cloudgroupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
dependency>
<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-webartifactId>
dependency>

4 服务消费者

server:
  port: 8089
  application:
    name: ddd-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

<dependency>
       <groupId>com.alibaba.cloudgroupId>
       <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
   dependency>
   <dependency>
       <groupId>org.springframework.bootgroupId>
       <artifactId>spring-boot-starter-webartifactId>
   dependency>
   <dependency>
       <groupId>org.springframework.cloudgroupId>
       <artifactId>spring-cloud-starter-loadbalancerartifactId>
       <version>3.0.1version>
   dependency>

5 调用方式和上面的一样,使用负载均衡的RestTemplate 进行调用