Spring-cloud (vi) hystrix INTRODUCTION

Premise

• An available Eureka registry (text to the previous blog in the two-node registry, not important)
• A service provider who connects to this registry

Quick Start Project Setup

Build a new Maven project, Artifactid for Ribbon-consum-hystrix, rely on the Ribbon-customer project to add Hystrix dependency, here directly, pom.xml configuration is as follows:

<?xmlVersion= "1.0" encoding= "UTF-8"?><projectxmlns="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>        <!--exposure to a variety of indicators -        <dependency>            <groupId>Org.springframework.boot</groupId>            <artifactId>Spring-boot-starter-actuator</artifactId>        </dependency>        <!--hystrix fuses --        <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>

New Package Com.cnblogs.hellxz, new app entry class 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 fuses use HelloWorld* @Date: 2018/4/20 10:03 */@SpringCloudApplication Public classribbonapplication {@Bean    @LoadBalancedResttemplategetresttemplate(){return New resttemplate(); } Public Static void Main(string[] args) {springapplication.Run(Ribbonapplication.class, args); }}

Resources directory to add the configuration file Application.yml, where the Defaultzone URL is the actual registry Defaultzone address

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

Under the COM.CNBLOGS.HELLXZ package to create a new controller package and service package, the controller package to create a new Ribboncontroller, the code is as follows:

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 consumer Controller* @Date: 2018/4/20 10:07 */@RestController Public classRibboncontroller {@AutowiredRibbonservice Service;@GetMapping("/hystrix/test") PublicStringHellohystrix(){//Call the service layer method        returnService.HelloService(); }}

Under Service package, create a new ribbonservice with the following code:

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 service Layer* @Date: 2018/4/20 10:08 */@Service Public classRibbonservice {@Autowired    PrivateResttemplate resttemplate;@HystrixCommand(Fallbackmethod ="Hystrixfallback") PublicStringHelloService(){//Call the service Provider interface and return the Hello string as normal        returnResttemplate.getforentity("Http://hello-service/hello", String.class).GetBody(); }/*** Call service failure handling method     * @return"Error"     */     PublicStringHystrixfallback(){return "Error"; }}

Final structure of the project

Test

Start 注册中心 ---> 服务提供者 ---separately >刚新建的项目
Visit http://localhost:8088/hystrix/test
Because now the service is normal and returned hello ,

The service provider project is now closed, accessed again, returned error ,

Spring-cloud (vi) hystrix INTRODUCTION