# spring-boot-hystrix-fallback

**Repository Path**: zclget/spring-boot-hystrix-fallback

## Basic Information

- **Project Name**: spring-boot-hystrix-fallback
- **Description**: hystrix熔断demo
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-10-15
- **Last Updated**: 2021-10-15

## Categories & Tags

**Categories**: Uncategorized

**Tags**: SpringCloud

## README

# spring-boot-hystrix-fallback

#### 介绍
hystrix熔断demo

#### 软件架构
软件架构说明


#### 安装教程

1.  新建eureka-server服务，添加eureka-server依赖，添加yml配置
```xml
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
```
```yml
server:
  port: 8081
eureka:
  instance:
    hostname: 127.0.0.1
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

```
- 启动，访问http://localhost:8081/
2.  新建spring-boot-spring-feign-hystrix项目，添加hystrix,openfeign,eureka-server依赖，添加yml配置
```xml
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.6.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>org.zcl</groupId>
<artifactId>boot-spring-feign-hystrix</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>boot-spring-feign-hystrix</name>
<description>boot-spring-feign-hystrix</description>
<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-hystrix</artifactId>
        <version>1.4.6.RELEASE</version>
    </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-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<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>
```
```yml
spring:
  application:
    name: movie
server:
  port: 8083
eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:8081/eureka
feign:
  hystrix:
    enabled: true
```
- springcloud2020已经移除了hystrix，这里用的是Hoxton.SR1版本
- 启动类添加配置，开启feign，开启hystrix，开启服务注册
```java
@EnableEurekaClient
@SpringBootApplication
@EnableFeignClients
@EnableHystrix
```
- 调用feign接口userFeignClient.findById(id)
- @FeignClient(name = "spring-boot-user", fallbackFactory = HystrixClientFallbackFactory.class)，配置调用服务应用名，配置熔断fallback
- HystrixClientFallbackFactory实现FallbackFactory接口，重写create方法
3.  新建调用端服务spring-boot-user

#### 使用说明

1.  先启动spring-boot-eureka-server服务作为注册中心服务端
2.  然后启动spring-boot-spring-feign-hystrix
3.  发请求调用http://localhost:8083/movie/1，如果spring-boot-user服务调用失败，会走fallback，返回兜底值

#### 参与贡献

1.  Fork 本仓库
2.  新建 Feat_xxx 分支
3.  提交代码
4.  新建 Pull Request


#### spring-cloud相关依赖

1.  spring-cloud-starter-netflix-eureka-server
2.  spring-cloud-starter-openfeign
3.  spring-cloud-starter-hystrix