微服务 springcloud 09.整合feign到项目一个子服务中

01.项目结构如下：

02.修改sp04-orderservice项目，添加feign，调用item service和user service
1.sp04-orderservice项目的pom.xml
添加以下依赖:
actuator
feign
hystrix

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.3.1.RELEASE
		 
	
	cn.tedu
	sp04-orderservice
	0.0.1-SNAPSHOT
	sp04-orderservice
	Demo project for Spring Boot
	
		1.8
	
	
		
			org.springframework.boot
			spring-boot-starter-web
		

		
			org.springframework.boot
			spring-boot-starter-test
			test
			
				
					org.junit.vintage
					junit-vintage-engine
				
			
		
		
			cn.tedu
			sp01-commons
			0.0.1-SNAPSHOT
		
		
			org.springframework.cloud
			
				spring-cloud-starter-netflix-eureka-client
			
		
		
			org.springframework.boot
			spring-boot-starter-actuator
		
		
			org.springframework.cloud
			
				spring-cloud-starter-netflix-hystrix
			
		
		
			org.springframework.cloud
			spring-cloud-starter-openfeign
		
	

	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

	
		
			
				org.springframework.cloud
				spring-cloud-dependencies
				Hoxton.SR12
				pom
				import
			
		
	

2.sp04-orderservice项目的application.yml
ribbon 重试和 hystrix 超时这里没有设置，采用了默认值

spring:
  application:
    name: order-service

server:
  port: 8201
  
eureka:
  client:
    service-url:
      defaultZone: http://eureka1:2001/eureka,http://eureka2:2002/eureka

feign:
  hystrix:
    enabled: true

management:
  endpoints:
    web:
      exposure:
        include: hystrix.stream

3.主程序

package cn.tedu.sp04;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

//@EnableDiscoveryClient
//@SpringBootApplication

@SpringCloudApplication
@EnableFeignClients
public class Sp04OrderserviceApplication {

	public static void main(String[] args) {
		SpringApplication.run(Sp04OrderserviceApplication.class, args);
	}

}

4.ItemFeignService

package cn.tedu.sp04.order.feignclient;

import java.util.List;
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.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;

@FeignClient(name="item-service", fallback = ItemFeignServiceFB.class)
public interface ItemFeignService {
	@GetMapping("/{orderId}")
	JsonResult> getItems(@PathVariable String orderId);

	@PostMapping("/decreaseNumber")
	JsonResult decreaseNumber(@RequestBody List items);
}

5.UserFeignService

package cn.tedu.sp04.order.feignclient;

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.RequestParam;
import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;

@FeignClient(name="user-service", fallback = UserFeignServiceFB.class)
public interface UserFeignService {
	@GetMapping("/{userId}")
	JsonResult getUser(@PathVariable Integer userId);

	@GetMapping("/{userId}/score") 
	JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);
}

6.ItemFeignServiceFB
获取商品列表的降级方法，模拟使用缓存数据

package cn.tedu.sp04.order.feignclient;

import java.util.Arrays;
import java.util.List;
import org.springframework.stereotype.Component;
import cn.tedu.sp01.pojo.Item;
import cn.tedu.web.util.JsonResult;

@Component
public class ItemFeignServiceFB implements ItemFeignService {

	@SuppressWarnings("unchecked")
	@Override
	public JsonResult> getItems(String orderId) {
		if(Math.random()<0.5) {
			return JsonResult.ok().data(
				Arrays.asList(new Item[] {
						new Item(1,"缓存手机商品",2),
						new Item(2,"缓存电脑商品",1),
						new Item(3,"缓存知识的海洋",3),
						new Item(4,"缓存奥特曼玩具",1),
						new Item(5,"缓存喜羊羊玩具",5)				
})
			);
		}
		return JsonResult.err("获取订单商品失败");
	}

	@Override
	public JsonResult decreaseNumber(List items) {
		return JsonResult.err("修改库存失败");
	}

}

7.UserFeignServiceFB
获取用户信息的降级方法，模拟使用缓存数据

package cn.tedu.sp04.order.feignclient;

import org.springframework.stereotype.Component;
import cn.tedu.sp01.pojo.User;
import cn.tedu.web.util.JsonResult;

@Component
public class UserFeignServiceFB implements UserFeignService {

	@Override
	public JsonResult getUser(Integer userId) {
		if(Math.random()<0.4) {
			return JsonResult.ok(new User(userId, "缓存name"+userId, "缓存pwd"+userId));
		}
		return JsonResult.err("获取用户信息失败");
	}

	@Override
	public JsonResult addScore(Integer userId, Integer score) {
		return JsonResult.err("增加用户积分失败");
	}

}

8.OrderServiceImpl

package cn.tedu.sp04.order.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp01.service.OrderService;
import cn.tedu.sp04.order.feignclient.ItemFeignService;
import cn.tedu.sp04.order.feignclient.UserFeignService;
import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Service
public class OrderServiceImpl implements OrderService {
	@Autowired
	private ItemFeignService itemService;
	@Autowired
	private UserFeignService userService;
	
	@Override
	public Order getOrder(String orderId) {
		//TODO: 调用user-service获取用户信息
		JsonResult user = userService.getUser(7);
		//TODO: 调用item-service获取商品信息
		JsonResult> items = itemService.getItems(orderId);
		
		Order order = new Order();
		order.setId(orderId);
		order.setItems(items.getData());
		order.setUser(user.getData());
		return order;
	}

	@Override
	public void addOrder(Order order) {
		//TODO: 调用item-service减少商品库存
		itemService.decreaseNumber(order.getItems());
		//TODO: 调用user-service增加用户积分
		userService.addScore(7, 100);
		log.info("保存订单："+order);
	}

}

9.order-service 配置启动参数,启动两台服务器
–server.port=8201
–server.port=8202





10.启动服务，访问测试

根据orderid，获取订单
http://localhost:8201/123abc
http://localhost:8202/123abc
保存订单
http://localhost:8201/
http://localhost:8202/

11.hystrix dashboard 监控 order service 断路器

访问 http://localhost:4001/hystrix ，填入 order service 的断路器监控路径，启动监控
http://localhost:8201/actuator/hystrix.stream
http://localhost:8202/actuator/hystrix.stream