Hystrix修改默认配置有两种方式，注解参数注入，和application.yml配置文件配置。

1、方法一：注解参数注入

    @RequestMapping(value = "/helloHystrixA/{string}", method = RequestMethod.GET)
    @HystrixCommand(fallbackMethod = "testFallback", // 请求失败降级回调方法，值为方法名，不需要括号
        commandProperties = {// 针对单个方法的配置
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"), // 开启熔断器，可不加默认为true
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "50"), // 请求错误超过50%，开启熔断器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"), // 一个周期(十秒)内超过10个请求才进行进行容错率判断
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),// 开启熔断器后过10秒再尝试访问
        })
    public String helloHystirxA(@PathVariable String string) {
        return "Nacos服务发现：远端调用成功！ result="
            + restTemplate.getForObject("http://nacos.provider.demo/hello/" + string, String.class);

郑天祺大约 2 分钟

SpringCloud使用Feign+Ribbon+Hystrix

1、引入依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>

郑天祺大约 1 分钟