SpringCloud如何分步实现Hystrix熔断器集成？

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版本：SpringBoot 2.6.1 + SpringCloud 2021.0.0依赖：groupId: org.springframework.cloudartifactId: spring-cloud-starter-netflix-hystrixversion: 2.1.6.RELEASE启用Hystrix：@EnableHystrix@EnableHystrix

版本：

SpringBoot 2.6.1

SpringCloud 2021.0.0

依赖

<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> <version>2.1.6.RELEASE</version> </dependency>

贴@EnableHystrix注解

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

在需要熔断的接口上贴@HystrixCommand注解

@RequestMapping("/consumerOne") @RestController public class ControllerOne { @Autowired private RestTemplate restTemplate; private String providerOneName = "provider-one"; @HystrixCommand(fallbackMethod = "fallbackMethodOne") @RequestMapping("/serviceOne/{msg}") public String serviceOne(@PathVariable("msg") String msg) { return restTemplate.getForObject("" + providerOneName + "/providerOne/serviceOne/" + msg, String.class); } /** 熔断回调方法 */ private String fallbackMethodOne(String msg) { return "熔断一默认返回:" + msg; } }

异常熔断测试

其中一个服务方抛异常，另一服务方正常返回

@RequestMapping("/providerOne") @RestController public class ControllerOne { @RequestMapping("/serviceOne/{msg}") public String serviceOne(@PathVariable("msg") String msg) { throw new RuntimeException(); // return "8702:" + msg; } }

@RequestMapping("/providerOne") @RestController public class ControllerOne { @RequestMapping("/serviceOne/{msg}") public String serviceOne(@PathVariable("msg") String msg) { return "8701:" + msg; } }

访问结果：

超时熔断测试

全局

先配置默认超时时间为3秒（default为全局）

hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000

在这里插入代码片

其中一个接口睡眠4秒

@RequestMapping("/providerOne") @RestController public class ControllerOne { @RequestMapping("/serviceOne/{msg}") public String serviceOne(@PathVariable("msg") String msg) { try { Thread.sleep(4 * 1000); return "8702:" + msg; } catch (InterruptedException e) { e.printStackTrace(); } return "8702:" + msg; } }

访问结果：

当服务方为延时返回的那个时，访问等待了3秒返回熔断默认对象

另一个正常

单个接口

除了全局外，另外给serviceTwo接口配置独立的超时时间，其余不变

hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000
serviceTwo:
execution:
isolation:
thread:
timeoutInMilliseconds: 5000

增加一个路径为serviceTwo的接口

@RequestMapping("/consumerOne") @RestController public class ControllerOne { @Autowired private RestTemplate restTemplate; private String providerOneName = "provider-one"; @HystrixCommand(fallbackMethod = "fallbackMethodOne") @RequestMapping("/serviceOne/{msg}") public String serviceOne(@PathVariable("msg") String msg) { return restTemplate.getForObject("" + providerOneName + "/providerOne/serviceOne/" + msg, String.class); } @HystrixCommand(fallbackMethod = "fallbackMethodOne") @RequestMapping("/serviceTwo/{msg}") public String serviceTwo(@PathVariable("msg") String msg) { return restTemplate.getForObject("" + providerOneName + "/providerOne/serviceOne/" + msg, String.class); } private String fallbackMethodOne(String msg) { return "熔断一默认返回:" + msg; } }

测试结果：

一个为等待5秒返回结果

一个正常返回

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