springcloud 之eureka+feign+zuul 基于boot2.0与cloud F版本搭建案例
springcloud 之eureka+feign+zuul 基于boot2.0与cloud F版本搭建案例
springcloud 之eureka+feign+zuul 基于boot2.0与cloud F版本搭建案例
问题： 1、我们知道dubbo是如何去调用其他应用，那么fegin是如何去调用的？
2、网关的作用是干嘛的呢？
3、eureka的作用是啥？
下面通过这个简单的实例可以帮助你去了解这些问题。
前言：
springcloud可以借助官网的一些工具去搭建比如：https://start.spring.io/ 如下图：
可以快速构建项目
当然也有另外一种：Spring IO Platform与spring boot版本对应关系
Spring IO Platform版本 | spring boot 版本 | spring cloud 版本 |
|---|---|---|
Cairo-SR7 | 2.0.8.RELEASE | Finchley |
Cairo-SR6 | 2.0.7.RELEASE | Finchley |
Cairo-SR5 | 2.0.6.RELEASE | Finchley |
Brussels-SR16 | 1.5.19.RELEASE | Edgware |
Brussels-SR15 | 1.5.18.RELEASE | Edgware |
Brussels-SR7 | 1.5.10.RELEASE | Edgware |
Spring IO是用于构建现代应用程序的具有凝聚力的版本平台。它是一种模块化的企业级发行版，提供了一系列精选的依赖项，同时使开发人员可以完全控制仅部署所需的部分。Spring IO是100％开源，精益和模块化的。
因为需要注意springboot与cloud的之间版本对应的关系，其实挺复杂的。
最好参照这个官网的一些例子去实践。
本次搭建只是一个简单demo，比如pom.xml父类，什么的没有去创建。
本项目目录结构：
EurekaService ：注册中心
Order：订单服务
User: 用户服务
Zuul:网关服务
注册中心代码：
pom文件：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/libs-snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>spring-releases</id> <name>Spring Releases</name> <url>https://repo.spring.io/libs-release</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> |
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yml文件：
server: port: 9000 eureka: instance: hostname: localhost client: registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ spring: application: name: eurka-server |
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启动类：
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class EurekaServer { public static void main(String[] args) { SpringApplication.run(EurekaServer.class, args); } } |
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项目截图：
User项目类：
pom.xml
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/libs-snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>spring-releases</id> <name>Spring Releases</name> <url>https://repo.spring.io/libs-release</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> |
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启动类：
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class User { public static void main(String[] args) { SpringApplication.run(User.class, args); } } |
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yml文件内容：
server: port: 9100 eureka: instance: hostname: localhost client: serviceUrl: defaultZone: http://${eureka.instance.hostname}:9000/eureka/ spring: application: name: UserServer |
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项目结构：
Order项目
pom.xml内容：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/libs-snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>spring-releases</id> <name>Spring Releases</name> <url>https://repo.spring.io/libs-release</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> |
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yml文件内容：
server: port: 9101 eureka: instance: hostname: localhost client: serviceUrl: defaultZone: http://${eureka.instance.hostname}:9000/eureka/ spring: application: name: OrderServer |
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启动类：
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication @EnableEurekaClient @EnableFeignClients public class Order { public static void main(String[] args) { SpringApplication.run(Order.class, args); } } |
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因为feign是客户端调用所以我们创建controller
我们现在是order应用去调用user应用，那么需要在order应用中去添加feign的jar与对应的接口代码如下：
import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.GetMapping; @FeignClient("UserServer") public interface UserService { @GetMapping("/getUserInfo") public String getInfo(); } |
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@FeignClient()使用这个注解 这里面需要填相对应的应用名称，也就是yml中配置的
spring:
application:
name: UserServer
当然别忘了在 user中添加对应的controller哦。
下面整合zuul网关：
pom.xml文件内容：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-zuul</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/libs-snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>spring-releases</id> <name>Spring Releases</name> <url>https://repo.spring.io/libs-release</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> |
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yml文件：
server: port: 9300 eureka: instance: hostname: localhost client: serviceUrl: defaultZone: http://${eureka.instance.hostname}:9000/eureka/ spring: application: name: Zuul zuul: routes: UserServer: path: /userApi/** serviceId: UserServer #strip-prefix: false OrderServer: path: /orderApi/** serviceId: OrderServer #strip-prefix: false |
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启动类：
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.netflix.zuul.EnableZuulProxy; @SpringBootApplication @EnableEurekaClient @EnableZuulProxy public class Zuul { public static void main(String[] args) { SpringApplication.run(Zuul.class, args); } } |
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项目结构：
效果：
我们把所有服务器都都启动起来顺序是：注册中心，订单，用户，网关服务顺序。
注册中心地址：http://localhost:9000/
看到我们的注册中心各种服务状态
如果出现以下错误，不要慌，是因为zuul网关加载需要时间 多刷新几次即可。
特别说明：strip-prefix默认为true,如果不想要前缀，可以设置为false 。
总结： 1、eureka相当于一个服务中心，所有的应用都需要注册到这个中心。
2、zuul网关的作用是统一入口，微服务拆分这么多端口，记不住。
3、fegin其实是通过http请求客户端的方式去相互调用。
做技术最难能可贵的就是持续的学习，吸收知识，不断的思考形成自己的理解和模式。