SpringCloud服务降级案列

一、什么是服务降级

　　所有的RPC技术里面服务降级是一个最为重要的话题，所谓的降级指的是当服务的提供方不可使用的时候，程序不会出现异常，而会出现本地的操作

二、服务降级案例

　　1、目录展示

　　2、导入依赖

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.11</version>

      <scope>test</scope>

    </dependency>

    <!--eureka依赖-->

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

    </dependency>

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-openfeign-core</artifactId>

      <version>2.1.0.RELEASE</version>

      <scope>compile</scope>

    </dependency>

    <!--feign依赖-->

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-starter-openfeign</artifactId>

    </dependency>

    <!--hystrix依赖-->

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-starter-hystrix</artifactId>

      <version>1.2.3.RELEASE</version>

    </dependency>

  </dependencies>

  <dependencyManagement>

    <dependencies>

      <!--springCloud依赖-->

      <dependency>

        <groupId>org.springframework.cloud</groupId>

        <artifactId>spring-cloud-dependencies</artifactId>

        <version>Greenwich.RELEASE</version>

        <type>pom</type>

        <scope>import</scope>

      </dependency>

    </dependencies>

  </dependencyManagement>