简介:
feign是一个声明式的伪http客户端,默认集成ribbon,并与eureka结合,实现了负载均衡的功能。可替代restTemplate_+ribbon
在上一篇的基础上,修改eureka-client
引入maven包:
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-feign</artifactId> </dependency>
在启动类上加上下面注解:
package com.xhx.springcloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.netflix.feign.EnableFeignClients; @SpringBootApplication @EnableEurekaClient @EnableFeignClients //启用feign public class EurekaFeignApplication { public static void main(String[] args) { SpringApplication.run(EurekaFeignApplication.class, args); } }
创建一个feign接口:
package com.xhx.springcloud.api; import org.springframework.cloud.netflix.feign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; /** * xuhaixing * 2018/6/5 16:51 */ @FeignClient(value = "EUREKA-SERVICE",path = "hello") public interface HelloFeign { @RequestMapping(value = "getName") public String getName(@RequestParam("name") String name);//@RequestParam 必须加上,否则可能会接不到参数 }
其中
value:代表 要访问的服务的名称
path: 代表路径
等同于访问:http://EUREKA-SERVICE/hello/getName
在controller中注入并调用:
package com.xhx.springcloud.controller; import com.netflix.discovery.converters.Auto; import com.xhx.springcloud.api.HelloFeign; 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; /** * xuhaixing * 2018/6/3 16:27 */ @RestController public class RibbionController { @Autowired private HelloFeign helloFeign; @RequestMapping(value = "getName") public String getName(String name){ return helloFeign.getName(name); } }
在postman中访问: