SpringCloud（五）feign请求api

妖狐艹你老母 2022-05-23 08:35 199阅读 0赞

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：

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