Spring Cloud Eureka 注册 Spring Cloud Eureka 注册与发现操作步骤详解
godliu711 人气:0想了解Spring Cloud Eureka 注册与发现操作步骤详解的相关内容吗，godliu711在本文为您仔细讲解Spring Cloud Eureka 注册的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：Spring,Cloud,Eureka,注册,Spring,Cloud,Eureka，下面大家一起来学习吧。
在搭建Spring Cloud Eureka环境前先要了解整个架构的组成，常用的基础模式如下图：
服务提供者：将springboot服务编写好以后，通过配置注册中心地址方式注册，提供给消费者使用。
注册中心：服务的中间桥梁，服务提供者将服务注册。服务消费者可以通过注册信息调用需要使用的服务。
服务消费者：通过规定的调用方式，读取注册中心的注册信息，调用相应的服务。
根据后续的服务复杂度进化以后，可以看到服务提供者也可以是服务消费者，服务消费者也可以是服务提供者。根据不同的业务情况是可以互相调用的。
下面来搭建一个基础的eureka。环境还是使用的之前的spring官方下载的。
内容写的比较详细，可以跟这一步步操作。
一、注册中心
以下是几个需要修改和添加的地方，后面会有完整的pom.xml
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.SR2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <!-- 最新版的 eureka 服务端包 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <!-- 监控管理 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>
| Spring Cloud | Spring Boot |
|---|---|
| Angel版本 | 兼容Spring Boot 1.2.x |
| Brixton版本 | 兼容Spring Boot 1.3.x，也兼容Spring Boot 1.4.x |
| Camden版本 | 兼容Spring Boot 1.4.x，也兼容Spring Boot 1.5.x |
| Dalston版本、Edgware版本 | 兼容Spring Boot 1.5.x，不兼容Spring Boot 2.0.x |
| Finchley版本 | 兼容Spring Boot 2.0.x，不兼容Spring Boot 1.5.x |
| Greenwich版本 | 兼容Spring Boot 2.1.x |
这里采用Finchley.SR2版本 springboot版本改成 2.1.3.RELEASE
完整的pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>eureka1</artifactId> <version>0.0.1-SNAPSHOT</version> <name>eureka1</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.SR2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <!-- 最新版的 eureka 服务端包 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <!-- 监控管理 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@EnableEurekaServer
@SpringBootApplication
public class Eureka1Application {
public static void main(String[] args) {
SpringApplication.run(Eureka1Application.class, args);
}
}
然后在代码文件中添加@EnableEurekaServer注解
修改application.yml文件
server: port: 3000 # 端口 eureka: instance: hostname: eureka-center appname: 注册中心 client: registerWithEureka: false # 单点的时候设置为 false 禁止注册自身 fetchRegistry: false serviceUrl: defaultZone: http://localhost:3000/eureka server: enableSelfPreservation: false evictionIntervalTimerInMs: 4000
启动服务
浏览器输入 http://127.0.0.1:3000
证明注册中心搭建成功了
二、服务提供者
前面的步骤一样
ProviderController是新建的一个服务代码
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- eureka 客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
不同的地方有加了一个spring-boot-starter-web和spring-cloud-starter-netflix-eureka-client客户端
完整的pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>eurekaClient1</artifactId> <version>0.0.1-SNAPSHOT</version> <name>eurekaClient1</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.SR2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- eureka 客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
EurekaClient1Application
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@EnableEurekaClient
@SpringBootApplication
public class EurekaClient1Application {
public static void main(String[] args) {
SpringApplication.run(EurekaClient1Application.class, args);
}
}
ProviderController
package com.example.demo;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ProviderController {
@RequestMapping(value = "/hello")
public String hello(){
return "hello spring cloud!";
}
@RequestMapping(value = "/nice")
public String nice(){
return "nice to meet you!";
}
}
application.yml
server: port: 3001 eureka: instance: preferIpAddress: true client: serviceUrl: defaultZone: http://localhost:3000/eureka ## 注册到 eureka spring: application: name: single-provider ## 应用程序名称，后面会在消费者中用到
证明服务已经注册成功
三、服务消费者
前面还是同上
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <!-- eureka 客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
pom.xml新增以上内容
完整pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>eurekaClient1</artifactId> <version>0.0.1-SNAPSHOT</version> <name>eurekaClient1</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.SR2</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <!-- eureka 客户端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
EurekaClient2Application
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@EnableEurekaClient
@EnableFeignClients
@SpringBootApplication
public class EurekaClient2Application {
/**
* 注入 RestTemplate
* 并用 @LoadBalanced 注解，用负载均衡策略请求服务提供者
* 这是 Spring Ribbon 的提供的能力
* @return
*/
@LoadBalanced
@Bean
public RestTemplate restTemplate() {
return new RestTemplate(); //用于调用服务对象
}
public static void main(String[] args) {
SpringApplication.run(EurekaClient2Application.class, args);
}
}
ConsumerController
package com.example.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class ConsumerController {
@Autowired
private RestTemplate restTemplate;
private static final String applicationName = "single-provider";//服务注册名
@RequestMapping(value = "commonRequest")
public Object commonRequest(){
String url = "http://"+ applicationName +"/hello";
String s = restTemplate.getForObject(url,String.class);//Ribbon方式调用服务
return s;
}
}
application.yml
server: port: 3002 eureka: client: serviceUrl: defaultZone: http://127.0.0.1:3000/eureka ## 注册到 eureka instance: preferIpAddress: true spring: application: name: single-customer
启动服务
http://127.0.0.1:3002/commonRequest
返回服务提供者的 hello方法参数。
整个最简单的过程就完成了，需要更好的使用spring cloud 后续需要了解分布式、负载均衡、熔断等概念。在后续章节将一步步的拆分。
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