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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