package demo.yangxu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class, args);
    }
}

package demo.yangxu.springcloud.service;

import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {
    /**
     * 正常访问，肯定OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    public String paymentInfo_TimeOut(Integer id)
    {
        int timeNumber = 3;
        try { TimeUnit.SECONDS.sleep(timeNumber); } catch (InterruptedException e) { e.printStackTrace(); }
        return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(秒): "+timeNumber;
    }
}

package demo.yangxu.springcloud.controller;

import demo.yangxu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @Value("${server.port}")
    private String severPort;

    @GetMapping(value = "/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id){
        String result = paymentService.paymentInfo_OK(id);
        log.info("*****result: "+result);
        return result;
    }

    @GetMapping(value = "/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
        String result = paymentService.paymentInfo_TimeOut(id);
        log.info("*****result: "+result);
        return result;
    }
}

@SpringBootApplication
@EnableFeignClients
public class OrderHystrixMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderHystrixMain80.class,args);
    }
}

package demo.yangxu.springcloud.service;

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")
public interface PaymentHystrixService {

    @GetMapping(value = "/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id);

    @GetMapping(value = "/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id);
}

package demo.yangxu.springcloud.controller;

import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import demo.yangxu.springcloud.service.PaymentHystrixService;
import javafx.beans.DefaultProperty;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
public class OrderHystirxController {
    
    @Resource
    private PaymentHystrixService paymentHystrixService;

    @GetMapping(value = "/consumer/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id){
        String result = paymentHystrixService.paymentInfo_OK(id);
        return result;
    }

    @GetMapping(value = "/consumer/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
        String result = paymentHystrixService.paymentInfo_TimeOut(id);
        return result;
    }
}

package demo.yangxu.springcloud.service;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {
    /**
     * 正常访问，肯定OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
            //3秒内访问正常，超过3秒交由fallbackMethod处理
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="3000")
    })
    public String paymentInfo_TimeOut(Integer id)
    {
        int timeNumber = 5;
        try { TimeUnit.SECONDS.sleep(timeNumber); } catch (InterruptedException e) { e.printStackTrace(); }
        return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(秒): "+timeNumber;
    }

    public String paymentInfo_TimeOutHandler(Integer id){
        return "线程池:  "+ Thread.currentThread().getName()+
                " 8001系统繁忙或者运行报错，请稍后再试,id:  "+id+
                "\t"+"o(╥﹏╥)o";
    }
}

package demo.yangxu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class, args);
    }
}

package demo.yangxu.springcloud.service;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {
    /**
     * 正常访问，肯定OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
            //3秒内访问正常，超过3秒交由fallbackMethod处理
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="3000")
    })
    public String paymentInfo_TimeOut(Integer id)
    {
        //int timeNumber = 5;
        //try { TimeUnit.SECONDS.sleep(timeNumber); } catch (InterruptedException e) { e.printStackTrace(); }
        //return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(秒): "+timeNumber;
        int age = 10/0;
        return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  演示计算异常";
    }

    public String paymentInfo_TimeOutHandler(Integer id){
        return "线程池:  "+ Thread.currentThread().getName()+
                " 8001系统繁忙或者运行报错，请稍后再试,id:  "+id+
                "\t"+"o(╥﹏╥)o";
    }
}

package demo.yangxu.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 OrderHystrixMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderHystrixMain80.class,args);
    }
}

package demo.yangxu.springcloud.controller;

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 demo.yangxu.springcloud.service.PaymentHystrixService;
import javafx.beans.DefaultProperty;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
public class OrderHystirxController {

    @Resource
    private PaymentHystrixService paymentHystrixService;

    @GetMapping(value = "/consumer/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id){
        String result = paymentHystrixService.paymentInfo_OK(id);
        return result;
    }

    @GetMapping(value = "/consumer/payment/hystrix/timeout/{id}")
    @HystrixCommand(fallbackMethod = "paymentTimeOutFallbackMethod",commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="1500")
    })
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
        String result = paymentHystrixService.paymentInfo_TimeOut(id);
        return result;
    }

    public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id)
    {
        return "我是消费者80,对方支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,o(╥﹏╥)o";
    }
}

@HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
        //设置访问正常的时间，超时交由fallbackMethod处理
        @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="5000")
})
public String paymentInfo_TimeOut(Integer id)
{
    int timeNumber = 3000;
    try { TimeUnit.MILLISECONDS.sleep(timeNumber); } catch (InterruptedException e) { e.printStackTrace(); }
    return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(毫秒): "+timeNumber;
}

@GetMapping(value = "/consumer/payment/hystrix/timeout/{id}")
@HystrixCommand(fallbackMethod = "paymentTimeOutFallbackMethod",commandProperties = {
        @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="1500")
})
public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
    int age = 10/0;
    String result = paymentHystrixService.paymentInfo_TimeOut(id);
    return result;
}

package demo.yangxu.springcloud.controller;

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 demo.yangxu.springcloud.service.PaymentHystrixService;
import javafx.beans.DefaultProperty;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
@DefaultProperties(defaultFallback = "payment_Global_FallbackMethod")
public class OrderHystirxController {

    @Resource
    private PaymentHystrixService paymentHystrixService;

    @GetMapping(value = "/consumer/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id){
        String result = paymentHystrixService.paymentInfo_OK(id);
        return result;
    }

    @GetMapping(value = "/consumer/payment/hystrix/timeout/{id}")
    @HystrixCommand
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
        int age = 10/0;
        String result = paymentHystrixService.paymentInfo_TimeOut(id);
        return result;
    }

    public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id) {
        return "我是消费者80,对方支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,o(╥﹏╥)o";
    }

    // 全局fallback方法
    public String payment_Global_FallbackMethod() {
        return "Global异常处理信息，请稍后再试，/(ㄒoㄒ)/~~";
    }

}

package demo.yangxu.springcloud.service;

import org.springframework.stereotype.Component;

@Component
public class PaymentFallbackService implements PaymentHystrixService {
    @Override
    public String paymentInfo_OK(Integer id) {
        return "-----PaymentFallbackService fall back-paymentInfo_OK ,o(╥﹏╥)o";
    }

    @Override
    public String paymentInfo_TimeOut(Integer id) {
        return "-----PaymentFallbackService fall back-paymentInfo_TimeOut ,o(╥﹏╥)o";
    }
}

package demo.yangxu.springcloud.service;

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 = PaymentFallbackService.class)
public interface PaymentHystrixService {

    @GetMapping(value = "/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id);

    @GetMapping(value = "/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id);
}

package demo.yangxu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {
    /**
     * 正常访问，肯定OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
            //设置访问正常的时间，超时交由fallbackMethod处理
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="5000")
    })
    public String paymentInfo_TimeOut(Integer id)
    {
        int timeNumber = 3000;
        try { TimeUnit.MILLISECONDS.sleep(timeNumber); } catch (InterruptedException e) { e.printStackTrace(); }
        return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(毫秒): "+timeNumber;
        //int age = 10/0;
        //return "线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  演示计算异常";
    }

    public String paymentInfo_TimeOutHandler(Integer id){
        return "线程池:  "+ Thread.currentThread().getName()+
                " 8001系统繁忙或者运行报错，请稍后再试,id:  "+id+
                "\t"+"o(╥﹏╥)o";
    }

    //=====服务熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id)
    {
        if(id < 0)
        {
            throw new RuntimeException("******id 不能负数");
        }
        //等价于UUID.randomUUID().toString()
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id)
    {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }
}

package demo.yangxu.springcloud.controller;

import demo.yangxu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @Value("${server.port}")
    private String severPort;

    @GetMapping(value = "/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id){
        String result = paymentService.paymentInfo_OK(id);
        log.info("*****result: "+result);
        return result;
    }

    @GetMapping(value = "/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id){
        String result = paymentService.paymentInfo_TimeOut(id);
        log.info("*****result: "+result);
        return result;
    }

    //====服务熔断
    @GetMapping("/payment/circuit/{id}")
    public String paymentCircuitBreaker(@PathVariable("id") Integer id)
    {
        String result = paymentService.paymentCircuitBreaker(id);
        log.info("****result: "+result);
        return result;
    }
}

 @HystrixCommand(fallbackMethod = "fallbackMethod", groupKey = "strGroupCommand", commandKey = "strCommand", threadPoolKey = "strThreadPool",
   commandProperties = {
     // 设置隔离策略，THREAD 表示线程池 SEMAPHORE：信号池隔离
     @HystrixProperty(name = "execution.isolation.strategy", value = "THREAD"),
     // 当隔离策略选择信号池隔离的时候，用来设置信号池的大小（最大并发数）
     @HystrixProperty(name = "execution.isolation.semaphore.maxConcurrentRequests", value = "10"),
     // 配置命令执行的超时时间
     @HystrixProperty(name = "execution.isolation.thread.timeoutinMilliseconds", value = "10"),
     // 是否启用超时时间
     @HystrixProperty(name = "execution.timeout.enabled", value = "true"),
     // 执行超时的时候是否中断
     @HystrixProperty(name = "execution.isolation.thread.interruptOnTimeout", value = "true"),
     // 执行被取消的时候是否中断
     @HystrixProperty(name = "execution.isolation.thread.interruptOnCancel", value = "true"),

     // 允许回调方法执行的最大并发数
     @HystrixProperty(name = "fallback.isolation.semaphore.maxConcurrentRequests", value = "10"),
     // 服务降级是否启用，是否执行回调函数
     @HystrixProperty(name = "fallback.enabled", value = "true"),

     // 是否启用断路器
     @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),
     // 该属性用来设置在滚动时间窗中，断路器熔断的最小请求数。例如，默认该值为 20 的时候，如果滚动时间窗（默认10秒）内仅收到了19个请求， 即使这19个请求都失败了，断路器也不会打开。
     @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "20"),
     // 该属性用来设置在滚动时间窗中，表示在滚动时间窗中，在请求数量超过 circuitBreaker.requestVolumeThreshold 的情况下，如果错误请求数的百分比超过50, 就把断路器设置为 "打开" 状态，否则就设置为 "关闭" 状态。
     @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "50"),
     // 该属性用来设置当断路器打开之后的休眠时间窗。 休眠时间窗结束之后，会将断路器置为 "半开" 状态，尝试熔断的请求命令，如果依然失败就将断路器继续设置为 "打开" 状态，如果成功就设置为 "关闭" 状态。
     @HystrixProperty(name = "circuitBreaker.sleepWindowinMilliseconds", value = "5000"),
     // 断路器强制打开
     @HystrixProperty(name = "circuitBreaker.forceOpen", value = "false"),
     // 断路器强制关闭
     @HystrixProperty(name = "circuitBreaker.forceClosed", value = "false"),

     // 滚动时间窗设置，该时间用于断路器判断健康度时需要收集信息的持续时间
     @HystrixProperty(name = "metrics.rollingStats.timeinMilliseconds", value = "10000"),
     // 该属性用来设置滚动时间窗统计指标信息时划分"桶"的数量，断路器在收集指标信息的时候会根据设置的时间窗长度拆分成多个 "桶" 来累计各度量值，每个"桶"记录了一段时间内的采集指标。
     // 比如 10 秒内拆分成 10 个"桶"收集这样，所以 timeinMilliseconds 必须能被 numBuckets 整除。否则会抛异常
     @HystrixProperty(name = "metrics.rollingStats.numBuckets", value = "10"),
     // 该属性用来设置对命令执行的延迟是否使用百分位数来跟踪和计算。如果设置为 false, 那么所有的概要统计都将返回 -1。
     @HystrixProperty(name = "metrics.rollingPercentile.enabled", value = "false"),
     // 该属性用来设置百分位统计的滚动窗口的持续时间，单位为毫秒。
     @HystrixProperty(name = "metrics.rollingPercentile.timeInMilliseconds", value = "60000"),
     // 该属性用来设置百分位统计滚动窗口中使用 “ 桶 ”的数量。
     @HystrixProperty(name = "metrics.rollingPercentile.numBuckets", value = "60000"),
     // 该属性用来设置在执行过程中每个 “桶” 中保留的最大执行次数。如果在滚动时间窗内发生超过该设定值的执行次数，
     // 就从最初的位置开始重写。例如，将该值设置为100, 滚动窗口为10秒，若在10秒内一个 “桶 ”中发生了500次执行，
     // 那么该 “桶” 中只保留 最后的100次执行的统计。另外，增加该值的大小将会增加内存量的消耗，并增加排序百分位数所需的计算时间。
     @HystrixProperty(name = "metrics.rollingPercentile.bucketSize", value = "100"),
     // 该属性用来设置采集影响断路器状态的健康快照（请求的成功、 错误百分比）的间隔等待时间。
     @HystrixProperty(name = "metrics.healthSnapshot.intervalinMilliseconds", value = "500"),

     // 是否开启请求缓存
     @HystrixProperty(name = "requestCache.enabled", value = "true"),
     // HystrixCommand的执行和事件是否打印日志到 HystrixRequestLog 中
     @HystrixProperty(name = "requestLog.enabled", value = "true"),

   },
   threadPoolProperties = {
     // 该参数用来设置执行命令线程池的核心线程数，该值也就是命令执行的最大并发量
     @HystrixProperty(name = "coreSize", value = "10"),
     // 该参数用来设置线程池的最大队列大小。当设置为 -1 时，线程池将使用 SynchronousQueue 实现的队列，否则将使用 LinkedBlockingQueue 实现的队列。
     @HystrixProperty(name = "maxQueueSize", value = "-1"),
     // 该参数用来为队列设置拒绝阈值。 通过该参数， 即使队列没有达到最大值也能拒绝请求。
     // 该参数主要是对 LinkedBlockingQueue 队列的补充,因为 LinkedBlockingQueue 队列不能动态修改它的对象大小，而通过该属性就可以调整拒绝请求的队列大小了。
     @HystrixProperty(name = "queueSizeRejectionThreshold", value = "5"),
   }
 )
 public String strConsumer() {
  ResponseEntity<String> result = restTemplate.getForEntity("http://cloud-eureka-client/hello", String.class);
  return result.getBody();
 }

package demo.yangxu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

@SpringBootApplication
@EnableHystrixDashboard
public class HystrixDashboardMain9001 {
    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardMain9001.class,args);
    }
}

package demo.yangxu.springcloud;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class, args);
    }

    /**
     *此配置是为了服务监控而配置，与服务容错本身无关，springcloud升级后的坑
     *ServletRegistrationBean因为springboot的默认路径不是"/hystrix.stream"，
     *只要在自己的项目里配置上下面的servlet就可以了
     */
    @Bean
    public ServletRegistrationBean getServlet() {
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}