spring cloud 方法调用 feign

1、原始方法template调用

package com.hh;

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;

@SpringBootApplication
public class ConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class, args);
    }

    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

package com.hh.controller;

import com.hh.pojo.User;
import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("/consumer")
@Slf4j
@DefaultProperties(defaultFallback = "defaultFallback")
public class ConsumerController {

    @Autowired
    private RestTemplate restTemplate;


    @GetMapping("/{id}")
    public User queryById(@PathVariable Long id){

        String url = "http://localhost:9091/user/" + id;
        return restTemplate.getForObject(url, User.class);
    }


}

注意点：数据类型一定要一致，不然会报错

java.lang.IllegalStateException: PathVariable annotation was empty on param 0.

package com.hh.feign;


import com.hh.pojo.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;

//声明当前类是一个Feign客户端，指定服务名为user-service
@FeignClient(value="user-service")
@Resource
public interface UserClient {

    //http://user-service/user/123
    @GetMapping("/user/{id}")
    User queryById(@PathVariable("id") Long id);
}