Spring Cloud入门系列（十）- 服务熔断与降级之Hystrix

新建 客户端 模块：cloud-consumer-feign-hystrix-order80

结构图，如下：

pom.xml

    
        cloud201230
        com.banana
        1.0-SNAPSHOT
    
    4.0.0

    cloud-consumer-feign-hystrix-order80

    
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-hystrix
        
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
        
            com.banana
            cloud-api-commons
            1.0-SNAPSHOT
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        
    

application.yml

server:
  port: 80

eureka:
  client:
    #是否将自己注册到注册中心, 默认true
    register-with-eureka: false
    #是否从EurekaServer抓取已有的注册信息,单机无所谓,集群必须设置为true配合ribbon使用负载均衡
    #fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka  #单机版

feign:
  hystrix:
    enabled: true

FeignHystrixOrder80

package com.banana.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.openfeign.EnableFeignClients;


@SpringBootApplication
@EnableFeignClients
@EnableHystrix
public class FeignHystrixOrder80 {
    public static void main(String[] args) {
            SpringApplication.run(FeignHystrixOrder80.class,args);
        }
}

OpenFeignOrderService

package com.banana.springcloud.service;

import com.banana.springcloud.service.fallback.OpenFeignOrderFallbackService;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;


@Component
@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallback = OpenFeignOrderFallbackService.class)
public interface OpenFeignOrderService {

    
    @GetMapping(value = "/payment/hystrix/success/{id}")
    String feignSuccess(@PathVariable("id") Long id);
    
    @GetMapping("/payment/hystrix/timeout/{id}")
    String feignTimeout(@PathVariable("id") Long id);
}

OpenFeignOrderFallbackService

package com.banana.springcloud.service.fallback;

import com.banana.springcloud.service.OpenFeignOrderService;
import org.springframework.stereotype.Component;


@Component
public class OpenFeignOrderFallbackService implements OpenFeignOrderService {
    
    @Override
    public String feignSuccess(Long id) {
        return "-------OpenFeignOrderFallbackService, feignSuccess出错啦 , o(╥﹏╥)o";
    }
    
    @Override
    public String feignTimeout(Long id) {
        return "-------OpenFeignOrderFallbackService, feignTimeout出错啦 , o(╥﹏╥)o";
    }
}

OpenFeignOrderController

package com.banana.springcloud.controller;

import com.banana.springcloud.service.OpenFeignOrderService;
import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
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 javax.annotation.Resource;


@RestController
@RequestMapping("/consumer/hyxtrix")
@DefaultProperties(defaultFallback = "payment_Global_FallbackMethod")
public class OpenFeignOrderController {

    @Resource
    private OpenFeignOrderService openFeignOrderService;

    @GetMapping("/success/{id}")
    public String feignSuccess(@PathVariable("id") Long id){
        return openFeignOrderService.feignSuccess(id);
    }

    @GetMapping("/timeout/{id}")
    @HystrixCommand(fallbackMethod = "feignTimeoutHandler", commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "1000")
    })
    public String feignTimeout(@PathVariable("id") Long id){
        return openFeignOrderService.feignTimeout(id);
    }

    public String feignTimeoutHandler(@PathVariable("id") Long id){
        return "对方支付系统繁忙，请稍后重试！";
    }

    
    @GetMapping("/global/fallback")
    @HystrixCommand
    public String feignGlobalFallback(){
        String result = null;
        return result.toString();
    }
    
    public String payment_Global_FallbackMethod() {
        return "Global异常处理信息，请稍后再试，o(╥﹏╥)o";
    }
}