springcloud demo---feign

1.配置文件

server:
  port: 8765
spring:
  application:
    name: feign-provider
eureka:
  instance:
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 15
  client:
    healthcheck:
      enabled: true
    service-url:
      defaultZone: http://admin:123@localhost:8761/eureka/
feign:
  hystrix:
    enabled: true
hystrix:
  command:
    default:
      execution:
        timeout:
          enabled: true
        isolation:
          thread:
            timeoutInMilliseconds: 1000

2.依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

3.启动类

package com.transsion;

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
public class FeignProviderApplication {

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

}

4.testController和testService

package com.transsion;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @Autowired
    TestService testService;

    @RequestMapping(value = "/test", method = RequestMethod.GET)
    public String helloConsumer() {
        //调用了绑定PROVIDER服务接口的客户端向服务发起/test接口的调用
        return testService.test();
    }

}

package com.transsion;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

//@FeignClient("PROVIDER"):绑定注册的服务：其中value为注册服务的applicationName,fallbac为熔断器的配置
@FeignClient(name = "PROVIDER",fallback = FallbackTest.class)
public interface TestService {

    //绑定具体服务的REST接口
    @RequestMapping("/test")
    String test();
}

5.熔断类

package com.transsion;

import org.springframework.stereotype.Component;

//从@HystrixCommand(fallbackMethod）中的回调方法转换成回调类
@Component
public class FallbackTest implements TestService{
    @Override
    public String test() {
        return "fallback";
    }
}