springcloud eureka服务器搭建（SpringCloud微服务之Eureka集成OpenFeign）

版本说明

• spring-cloud-starter-openfeign ： 3.0.3
• spring-cloud-starter-netflix-eureka-client ：2.2.9.RELEASE
• spring-cloud-starter-netflix-ribbon : 2.2.9.RELEASE
• Spring-boot-starter-parent ：2.3.12.RELEASE
• spring-cloud-dependencies ：Hoxton.SR12

这里需要注意SpringBoot 与 SpringCloud的版本匹配，请参考：https://spring.io/projects/spring-cloud

可搭建单机版用于 Demo 测试

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>

这里暂时不需要数据库

@EnableeurekaClient @EnableDiscoveryClient @SpringBootApplication(exclude = DataSourceAutoConfiguration.class) public class HttpFeignProvider8083 { public static void main(String[] args) { SpringApplication.run(HttpFeignProvider8083.class, args); } }

这里很简单的两个URLMapping，简单模拟两个场景：

1. 根据用户id查询用户名；
2. 根据产品id查询产品名；

@RestController public class HttpFeignProviderController { @GetMapping("/user/getUserNameById") public String getUserNameById(@RequestParam("userId") String userId){ return "张学友"; } @GetMapping("/product/getProductNameById") public String getProductNameById(@RequestParam("productId") String productId){ return "iphone 13"; } }

server.port=8083 spring.application.name=http-feign-provider8083 eureka.client.serviceUrl.defaultZone=http://host80:8080/eureka/,http://host81:8081/eureka/,http://host82:8082/eureka/ eureka.client.serviceUrl.healthcheck=true # 若不配置该项，使用 spring.application.name 显示 #eureka.instance.instance-id=http-feign-provider8083 # actuator info 配置 info.app.name=${spring.application.name} info.company.name=pengld

这里增加了一个依赖：spring-cloud-starter-netflix-ribbon，用于服务调用时负载均衡。

<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</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.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> </dependency> </dependencies>

同样暂时不需要数据库，比服务提供者多一个注解：@EnableFeignClients

@EnableEurekaClient @EnableDiscoveryClient @EnableFeignClients @SpringBootApplication(exclude = DataSourceAutoConfiguration.class) public class HttpFeignConsumer8084 { public static void main(String[] args) { SpringApplication.run(HttpFeignConsumer8084.class, args); } }

对比到前文服务提供者的controller，这里模拟两个场景，实际开发中根据功能、模块等维度划分不同的client用于区分。

@FeignClient(name="http://http-feign-provider8083",contextId = "UserClient",path = "/user") public interface UserClient { @GetMapping("/getUserNameById") String getUserNameById(@RequestParam("userId") String userId); }

@FeignClient(name="http://http-feign-provider8083",contextId = "ProductClient",path = "/product") public interface ProductClient { @GetMapping("/getProductNameById") String getProductNameById(@RequestParam("productId") String productId); }

@RestController public class ConsumerController { @Autowired UserClient userClient; @Autowired ProductClient productClient; @GetMapping("/getUserNameById") public String getUserNameById(@RequestParam("userId") String userId){ return userClient.getUserNameById(userId); } @GetMapping("/getProductNameById") public String getProductNameById(@RequestParam("productId") String productId){ return productClient.getProductNameById(productId); } }