Feign之远程调用和负载均衡

标签: SpringCloud

1、引入依赖

		<!-- springcloud整合openFeign -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-openfeign</artifactId>
		</dependency>

2、配置调用接口

package com.yan.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.yan.order.entity.Product;

/**
 * 声明需要调用微服务的名称
 * @FeignClient
 *   name : 服务提供者的名称
 * @author Administrator
 *
 */
@FeignClient(name="product-service")
public interface ProductFeignClient {
	
	@RequestMapping(value="/product/{id}")
	public Product findById(@PathVariable("id")Long id);
}

3、在启动类上激活feign

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4、通过接口远程调用服务

package com.yan.order.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
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;

import com.yan.order.entity.Product;
import com.yan.order.feign.ProductFeignClient;

@RestController
@RequestMapping("/order")
public class OrderController {
	
	@Autowired
	private RestTemplate restTemplete;
	
	@Autowired
	private DiscoveryClient discoveryClient;
	
	@Autowired
	private ProductFeignClient productFeignClient;
	
	@RequestMapping(value="/findById/{id}")
	public String findById(@PathVariable Long id){
		Product product = null;
		product = productFeignClient.findById(id);
		return product.toString();
	}
	
	@RequestMapping(value="/save")
	public String save(){
		List<ServiceInstance> instances = discoveryClient.getInstances("product_service");
		for (ServiceInstance serviceInstance : instances) {
			System.out.println(serviceInstance.getHost());
			System.out.println(serviceInstance.getPort());
		}
		return "保存成功";
	}
	
}

5、请求压缩

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6、feign日志配置

###配置feign日志输出
#日志配置 NONE:不输出日志(性能高) BASIC:适用于生产环境追踪问题  
#     HEADERS:在BASIC的基础上,记录请求和响应头信息  FULL:记录所有
feign.client.config.product-service.loggerLevel=FULL
logging.level.com.yan.order.feign.ProductFeignClient=debug 

product-service为服务名称
com.yan.order.feign.ProductFeignClient为接口全路径

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