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这篇文章将为大家详细讲解有关Spring boot2X Consul使用Feign实现服务调用的方法,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
服务调用有两种方式:
A.使用RestTemplate 进行服务调用
B.使用Feign 进行声明式服务调用
上一次写了使用RestTemplate的方式,这次使用Feign的方式实现
服务注册发现中心使用Consul
启动Consul
consul agent -dev
spring boot 版本 2.2.1.RELEASE
1.服务端
provider
(1)添加依赖
<properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR3</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-consul-discovery</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
(2)修改配置
server.port=8010 spring.application.name=provider spring.cloud.consul.host=localhost spring.cloud.consul.port=8500 spring.cloud.consul.discovery.health-check-path=/actuator/health spring.cloud.consul.discovery.service-name=service-provider spring.cloud.consul.discovery.heartbeat.enabled=true management.endpoints.web.exposure.include=* management.endpoint.health.show-details=always
(3)测试方法
package com.xyz.provider.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class demoController { @RequestMapping("/hello") public String Hello(){ return "hello,provider"; } }
provider1
修改端口为8011
修改测试方法
package com.xyz.provider1.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class demoController { @RequestMapping("/hello") public String Hello(){ return "hello,another provider"; } }
启动provider和provider1
2.客户端
customer
(1)添加依赖
<properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR4</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-consul-discovery</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
(2)配置
server.port=8015 spring.application.name=xyz-comsumer spring.cloud.consul.host=localhost spring.cloud.consul.port=8500 spring.cloud.consul.discovery.register=false spring.cloud.consul.discovery.health-check-url=/actuator/health spring.cloud.consul.discovery.heartbeat.enabled=true management.endpoints.web.exposure.include=* management.endpoint.health.show-details=always
(3)修改启动类
添加注解 @EnableFeignClients,开启扫描Spring Cloud Feign客户端的功能
package com.xyz.comsumer; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate; @EnableFeignClients @SpringBootApplication public class ComsumerApplication { public static void main(String[] args) { SpringApplication.run(ComsumerApplication.class, args); } }
(4)添加Feign接口
添加注解@FeignClient(name = "provider")
provider是要调用的服务名
说明:
添加跟调用目标方法一样的方法声明,必须跟目标方法的定义一致
package com.xyz.consumer.controller; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; @FeignClient(name = "provider") public interface ProviderService { @RequestMapping("/hello") public String hello(); }
(4)服务调用
注入刚才声明的ProviderService,就可以像本地方法一样进行调用了
package com.xyz.consumer.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class FeignController { @Autowired private ProviderService providerService; @RequestMapping("/call") public String call() { return providerService.hello(); } }
启动customer
访问http://localhost:8015/call
交替返回结果
hello,provider 或 hello,another provider
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