Spring Cloud Eureka 注册与发现操作步骤详解
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。
到此这篇关于Spring Cloud Eureka 注册与发现操作步骤详解的文章就介绍到这了,更多相关Spring Cloud Eureka 注册内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!
- Spring-cloud-eureka使用feign调用服务接口
- SpringCloud如何使用Eureka实现服务之间的传递数据
- SpringCloud服务注册和发现组件Eureka
- SpringCloud实现Eureka服务注册与发现
- springboot cloud使用eureka整合分布式事务组件Seata 的方法
- SpringCloud搭建netflix-eureka微服务集群的过程详解
- 5分钟搭建SpringCloud Eureka服务注册中心的实现
- Spring Cloud 系列之注册中心 Eureka详解
- springcloud微服务之Eureka配置详解
- Springcloud eureka搭建高可用集群过程图解
- 如何用Eureka + Feign搭建分布式微服务
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