使用eureka注册的服务地址分发，注意需要设置消费服务的服务器需要修改本地hosts，否则找不到真实的服务地址

@FeignClient(value = "jjc-settlement", fallback = SettlementServiceHystric.class)
public interface SettlementService {
    @RequestMapping(value = "/settlement/ssth/verify/idCardCheck",method = RequestMethod.POST)
    public Boolean idCardCheck(@RequestBody VerifyReq req);
}

@Component
@Slf4j
public class SettlementServiceHystric implements SettlementService {
    @Override
    public Boolean idCardCheck(@RequestBody VerifyReq req) {
        log.info("@@@Hystric error:{}",req);
        return false;
    }
}

# feign的hystrix是否开启
feign.hystrix.enabled=true
# 指定超时时间
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=5000
# 超时发生异常属性关闭
hystrix.command.default.execution.timeout.enabled=false
# 针对调用失败重试的次数
ribbon.maxAutoRetries=3

负载均衡消费服务

Ribbon+RestTemplate

# pom.xml
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
# Application.java
# 通过@EnableDiscoveryClient向服务中心注册；并且向程序的ioc注入一个bean: restTemplate;并通过@LoadBalanced注解表明这个restRemplate开启负载均衡的功能
@SpringBootApplication
@EnableDiscoveryClient
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
}
# HelloService.java
@Service
public class HelloService {
    @Autowired
    RestTemplate restTemplate;
    public String hiService(String name) {
        return restTemplate.getForObject("http://SERVICE-HI/hi?name="+name,String.class);
    }

}
# HelloControler.java
@RestController
public class HelloControler {
    @Autowired
    HelloService helloService;
    @RequestMapping(value = "/hi")
    public String hi(@RequestParam String name){
        return helloService.hiService(name);
    }
}

Feign

# pom.xml
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
# Application.java
# 加上@EnableFeignClients注解开启Feign的功能
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}
# SchedualServiceHi.java
# 定义一个feign接口，通过@ FeignClient（“服务名”），来指定调用哪个服务。比如在代码中调用了service-hi服务的“/hi”接口
@FeignClient(value = "service-hi")
public interface SchedualServiceHi {
    @RequestMapping(value = "/hi",method = RequestMethod.GET)
    String sayHiFromClientOne(@RequestParam(value = "name") String name);
}
# HiController.java
# 通过上面定义的Feign客户端SchedualServiceHi 来消费服务
@RestController
public class HiController {

    @Autowired
    SchedualServiceHi schedualServiceHi;
    @RequestMapping(value = "/hi",method = RequestMethod.GET)
    public String sayHi(@RequestParam String name){
        return schedualServiceHi.sayHiFromClientOne(name);
    }
}