Cloud Hystrix

Spring Cloud Hystrix 可以实现的功能

    降级，熔断...

0. 工程中引入jar包

　　

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

1.启动类添加引用

　　@EnableCircuitBreaker 

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;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients("com.lvlvstart.spring.demo.common.client")
@EnableCircuitBreaker //熔断器注解
public class SpringUserApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringUserApplication.class, args);
    }

}

1.降级

　方法上添加注解 @HystrixCommand ，除了 HystrixBadRequestException 以外的异常，都会触发降级

 @HystrixCommand(fallbackMethod = "msg")

    @HystrixCommand(fallbackMethod = "msg")
    @PostMapping("findAllSchoolGet")
    public Result findAllGet(){
        return schoolClient.findAll();
    }