創建服務提供者
概述
當 Client 向 Server 註冊時,它會提供一些元數據,例如主機和端口,URL,主頁等。Eureka Server 從每個 Client 實例接收心跳消息。 如果心跳超時,則通常將該實例從註冊 Server 中刪除。
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>
Application
通過註解 @EnableEurekaClient
表明自己是一個 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);
}
}
application.yml
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
,這個很重要,這在以後的服務與服務之間相互調用一般都是根據這個 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);
}
}
啓動工程,打開 http://localhost:8761 ,即 Eureka Server 的網址:
你會發現一個服務已經註冊在服務中了,服務名爲 HELLO-SPRING-CLOUD-SERVICE-ADMIN
,端口爲 8762
這時打開 http://localhost:8762/hi?message=HelloSpring ,你會在瀏覽器上看到 :
Hi,your message is :"HelloSpring" i am from port:8762