(A) Spring Cloud service registration and discovery Eureka

A. Eureka Introduction

Eureka has three roles

1. the Register Server : service registry, which is a Eureka Server, service registration and discovery

2. Provider Server : service providers, it is a Eureka Client, to provide services

3. Consumer Server : consumer service, it is a Eureka Client, Consumer Services

Service consumption process:

1. The need for a service registry Eureka server

2. The service provider Eureka Client registered with the service registry Eureka Server, will own the IP, service name submitted to the registry Eureka server by Rest API

3. Service consumers, but also registered with the service registry Eureka Server, at the same time to get a list of service registration, the list contains all the registered service information to the service center, the information contained in the IP address of the service, so consumers http service can be remote call consumer service providers through the IP address

Two projects to build

1. First create a new maven project

Deleted src directory, modify the pom pom packaging is

2. The new Eureka Server Registry Module on new projects above

You've created, jar package to be downloaded, add application.yml file

server:
  port: 8761                   # Eureka-server 服务端接口
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

Next you need to add on the entrance class @EnableEurekaServer turn Eureka Server features

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

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

}

So far, Eureka Server set up is completed by http: // localhost: 8761 to access, but have not yet registered any instance

3. Eureka Client write

Ibid, create a new Module, select Eureka Discovery Client in spring cloud discovery

After a good add support for new web in the pom file

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

Add a profile application.yml, the Eureka client registered on the server side

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
server:
  port: 8762
spring:
  application:
    name: eureka-client

Open function on the inlet @EnableEurekaClient

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class EurekaClientApplication {

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

}

Write a test interface

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Devin Zhang
 * @className HelloController
 * @description TODO
 * @date 2020/3/17 14:58
 */

@RestController
public class HelloController {

    @Value("${server.port}")
    private String port;


    @GetMapping("/sayHello")
    public String sayHello(String msg) {
        return "hello " + msg + ", my port is :" + port;
    }
}

At this point the client Eureka Client build complete, start at Eureka Server can see the end of the service has been registered

By calling http: // localhost:? 8762 / sayHello msg = devin can see the client interface can also be a normal visit

(A) Spring Cloud service registration and discovery Eureka

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