[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 686 In Total
Viewed Times

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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
<?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.

1
2
3
4
5
6
7
8
9
10
11
12
13
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

1
2
3
4
5
6
7
8
9
10
11
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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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:

1

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 :

1
Hi,your message is :"HelloSpring" i am from port:8762

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


If you like this blog or find it useful for you, you are welcome to comment on it. You are also welcome to share this blog, so that more people can participate in it. If the images used in the blog infringe your copyright, please contact the author to delete them. Thank you !