[Spring Cloud Netflix] 4 service:创建服务提供者

创建服务提供者

Posted by Mr.Vincent on 2019-07-04
Estimated Reading Time 3 Minutes
Words 663 In Total
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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。

创建服务提供者

POM

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<?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.example</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://wvincen.gitee.io</url>
<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.example.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.

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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);
}
}

application.yml

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

server:
port: 8762

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

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

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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);
}
}

操作界面


启动工程,打开 http://localhost:8761 ,即 Eureka Server 的网址:

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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 :

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Hi,your message is :"HelloSpring" i am from port:8762

案例源码:https://github.com/V-Vincen/hello-spring-cloud


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