RestTemplate是不是很簡單粗暴呢？還有更粗暴的，那就是Feign，很多人都用過Dubbo，Feign的用法跟他類似。

我們複用userService那個module去呼叫productService微服務中的getProduct介面，引入Feign的依賴包：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
 

package com.tzy.userService;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
@FeignClient(value = "service-product")
public interface GetProductInterface {
    @RequestMapping
 
(value = "/getProduct")
    String getProduct();
}

@RequestMapping指向要遠端呼叫的方法

另外要在啟動程式Main.java裡的類上加上@EnableFeignClients，表示為服務中要使用FeignClient。

package com.tzy;
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
@EnableFeignClientspublic class Main {
    public static void main(String[] args){
        SpringApplication.run(Main.class,args);
}
}

package com.tzy.userService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class GetProductController {

    @Autowired
GetProductInterface getProductInterface;
@Autowired
GetProductService getProductService;
@RequestMapping(value = "/getGoods")
    public String getGoods(){
        return getProductInterface.getProduct();
}
}

結果可以得到正確的返回值。