【微服务架构 - 08 - Spring Cloud】03 创建服务提供者-蒲公英云

【微服务架构 - 08 - Spring Cloud】03 创建服务提供者

概述

当 Client 向 Server 注册时，它会提供一些元数据，例如主机和端口，URL，主页等。
Eureka Server 从每个 Client 实例接受心跳消息。如果心跳超时，则通常将该实例从注册 Server 中删除。

POM

<?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>
    <parent>
        <groupId>com.yuu</groupId>
        <artifactId>hello-spring-cloud-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>
    </parent>
    <artifactId>hello-spring-cloud-service-admin</artifactId>
    <packaging>jar</packaging>
    <name>hello-spring-cloud-service-admin</name>
    <inceptionYear>2019-Now</inceptionYear>
    <dependencies>
        <!-- Spring Boot Begin -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- Spring Boot End -->
        <!-- Spring Cloud Begin -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- Spring Cloud End -->
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.funtl.hello.spring.cloud.service.admin.ServiceAdminApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Application

通过注解 @EnableEurekaClient 表明自己是一个 Eureka Client

package com.yuu.hello.spring.cloud.service.admin;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
 * @Classname ServiceAdminApplication
 * @Date 2019/1/28 22:50
 * @Created by Yuu
 */
@SpringBootApplication
@EnableEurekaClient
public class ServiceAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(ServiceAdminApplication.class, args);
    }
}

application.yml

spring:
  application:
    name: hello-spring-cloud-service-admin
server:
  port: 8762
eureka:
  client:
    servcieUrl:
      defaultZone: http://localhost:8761/eureka/

注意： 需要指明 spring.application.name，因为这个很重要，这在以后的服务与服务之间相互调用一般都是根据这个 name

Controller

package com.yuu.hello.spring.cloud.service.admin.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
 * @Classname AdminController
 * @Date 2019/1/28 23:00
 * @Created by Yuu
 */
@RestController
public class AdminController {
    @Value("${server.port}")
    private String port;
    @RequestMapping(value = "hi", method = RequestMethod.GET)
    public String sayHi(@RequestParam(value = "message") String message) {
        return String.format("Hi, your message is : %s : i am from port: %s", message, port);
    }
}