前提

• 一個(gè)可用的Eureka注冊(cè)中心（文中以之前博客中雙節(jié)點(diǎn)注冊(cè)中心，不重要）
• 一個(gè)連接到這個(gè)注冊(cè)中心的服務(wù)提供者

快速入門(mén)

項(xiàng)目搭建

搭建一個(gè)新maven項(xiàng)目，artifactid為Ribbon-consum-hystrix，依賴(lài)是在ribbon-customer項(xiàng)目上加入hystrix依賴(lài)，這里直接給出，pom.xml配置如下：

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.cnblogs.hellxz</groupId><artifactId>Ribbon-consum-hystrix</artifactId><version>1.0-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.RELEASE</version><relativePath/></parent><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId><version>RELEASE</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-ribbon</artifactId><version>RELEASE</version></dependency><!--暴露各種指標(biāo)--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><!--hystrix熔斷器--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix</artifactId><version>RELEASE</version></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>RELEASE</version><scope>import</scope><type>pom</type></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>1.8</source><target>1.8</target></configuration></plugin></plugins></build> </project>

新建包c(diǎn)om.cnblogs.hellxz,新建應(yīng)用入口類(lèi)RibbonApplication:

package com.cnblogs.hellxz;import org.springframework.boot.SpringApplication; import org.springframework.cloud.client.SpringCloudApplication; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate;/*** @Author : Hellxz* @Description: Hystrix熔斷器使用HelloWorld* @Date : 2018/4/20 10:03*/ @SpringCloudApplication public class RibbonApplication {@Bean@LoadBalancedRestTemplate getRestTemplate(){return new RestTemplate();}public static void main(String[] args) {SpringApplication.run(RibbonApplication.class, args);} }

resources目錄下添加配置文件application.yml，其中defaultZone的url為實(shí)際注冊(cè)中心defaultZone地址

server:port: 8088spring:application:name: ribbon-hystrixeureka:client:serviceUrl:defaultZone: http://peer1:1111/eureka/,http://peer2:1112/eureka/

在com.cnblogs.hellxz包下分別新建controller包和service包，controller包中新建RibbonController，代碼如下：

package com.cnblogs.hellxz.controller;import com.cnblogs.hellxz.servcie.RibbonService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;/*** @Author : Hellxz* @Description: Ribbon消費(fèi)者controller* @Date : 2018/4/20 10:07*/ @RestController public class RibbonController {@AutowiredRibbonService service;@GetMapping("/hystrix/test")public String helloHystrix(){//調(diào)用服務(wù)層方法return service.helloService();}}

service包下新建RibbonService，代碼如下：

package com.cnblogs.hellxz.servcie;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate;/*** @Author : Hellxz* @Description: Ribbon服務(wù)層* @Date : 2018/4/20 10:08*/ @Service public class RibbonService {@Autowiredprivate RestTemplate restTemplate;@HystrixCommand(fallbackMethod = "hystrixFallback")public String helloService(){//調(diào)用服務(wù)提供者接口，正常則返回hello字符串return restTemplate.getForEntity("http://hello-service/hello", String.class).getBody();}/*** 調(diào)用服務(wù)失敗處理方法* @return “error"*/public String hystrixFallback(){return "error";} }

項(xiàng)目最后的結(jié)構(gòu)如圖

測(cè)試

分別啟動(dòng) 注冊(cè)中心--->服務(wù)提供者--->剛新建的項(xiàng)目
訪問(wèn)http://localhost:8088/hystrix/test
因?yàn)楝F(xiàn)在服務(wù)是正常的，返回了hello，如圖

此時(shí)關(guān)閉服務(wù)提供者項(xiàng)目，再次訪問(wèn)，返回了error，如圖

轉(zhuǎn)載于:https://www.cnblogs.com/hellxz/p/8889017.html

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