SpringBoot怎样使用feign实现远程接口调用和错误熔断

2021-04-02 我要评论

这篇文章主要介绍了SpringBoot如何使用feign实现远程接口调用和错误熔断,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1.第一步，新建两个简单的springboot项目并创建rest接口

demo系统的rest接口

plus系统的调用接口

2.在项目pom文件里导入feign和hystrix的pom依赖包

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
  </properties>

<!-- 支持使用feign客户端 -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
    <!-- 支持使用hystrix断路器 -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
    </dependency>

<dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring-cloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

3.创建远程调用client及熔断回调类

package com.mybatis.plus.web.client;

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

@FeignClient(name="demo",url="${conf.address.demo}",fallbackFactory=DemoFeignClientFB.class)
public interface DemoFeignClient {
  
  @RequestMapping("cmpOclOrder/demoFeign")
  public String testFeign();

}

package com.mybatis.plus.web.client;

import feign.hystrix.FallbackFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Component;

@Component
public class DemoFeignClientFB implements FallbackFactory<DemoFeignClient> {
  private static Log logger = LogFactory.getLog(DemoFeignClientFB.class);

  @Override
  public DemoFeignClient create(Throwable throwable) {
    return new DemoFeignClient() {
      @Override
      public String testFeign() {
        return "demo系统接口调用失败";
      }
    };
  }
}

这里的url在配置文件里面有定义（就是需要调用系统的IP及端口）