创建服务提供者

本节视频

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 实例接收心跳消息。 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.funtl</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>
    <url>http://www.funtl.com</url>
    <inceptionYear>2018-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>
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Application

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

package com.funtl.hello.spring.cloud.service.admin;

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

@SpringBootApplication
@EnableEurekaClient
public class ServiceAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(ServiceAdminApplication.class, args);
    }
}
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application.yml

spring:
  application:
    name: hello-spring-cloud-service-admin

server:
  port: 8762

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
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注意: 需要指明 spring.application.name,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.funtl.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;

@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);
    }
}
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启动工程,打开 http://localhost:8761 ,即 Eureka Server 的网址:

你会发现一个服务已经注册在服务中了,服务名为 HELLO-SPRING-CLOUD-SERVICE-ADMIN ,端口为 8762

这时打开 http://localhost:8762/hi?message=HelloSpring ,你会在浏览器上看到 :

Hi,your message is :"HelloSpring" i am from port:8762
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上次更新: 2019-4-19 19:23:15