SpringCould总结 | 第五篇服务调用失败熔断器Hystrix

我会带着你远行 2022-05-21 00:54 98阅读 0赞

===========ribbon中使用熔断器解决服务调用失败===========

//工程结构

![70][]

//pom文件

<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>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.8.RELEASE</version>
    		<relativePath />
    	</parent>
    
    	<groupId>com.spc.hystrix.server</groupId>
    	<artifactId>spc-hystrix-server</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>spc-hystrix-server</name>
    	<url>http://maven.apache.org</url>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    		<spring-cloud.version>Edgware.RELEASE</spring-cloud.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-eureka-server</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-ribbon</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-hystrix</artifactId>
    		</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>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    </project>

//服务配置

spring.application.name=spc-ribbon-server
    server.port=2000
    
    eureka.client.service-url.defaultZone=http://localhost:1000/eureka/
    
    #eureka.instance.preferIpAddress=true
    #eureka.instance.instance-id=${spring.cloud.client.ipAddress}:${server.port}

//服务类

package com.spc.hystrix.server.spc_hystrix_server;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.web.client.RestTemplate;
    
    import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
    
    @Service
    public class AppService {
    
        @Autowired
        RestTemplate restTemplate;
    
        @HystrixCommand(fallbackMethod = "reqErrFallBack")
        public String queryOrderStatusById(String orderId) {
            return restTemplate.getForObject("http://SPC-SERVICE-ORDER/queryOrderStatusById?orderId="+orderId,String.class);
        }
        
        @HystrixCommand(fallbackMethod = "reqErrFallBack")
        public String queryWlInfoByOrderId(String orderId) {
          //return restTemplate.getForObject("http://xxx/xxx?xxx="+xxx,String.class);
        	return ":[订单-商品-已发货]";
        }
        
        public String reqErrFallBack(String orderId) {
        	//记录调用日志
            return "记录熔断日志:Error:"+orderId+"调用失败调用IP:xxxx!!!";
        }
      
    }

package com.spc.hystrix.server.spc_hystrix_server;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class AppControler {
    
        @Autowired
        private AppService appService;
        
        /**
         * 根据订单号查询订单状态查询物流信息
         * @param orderId
         * @return
         */
        @RequestMapping(value = "/queryOrderStatusAndWlInfoByOrderId")
        public String queryOrderStatusAndWlInfoByOrderId(@RequestParam String orderId){
            /**
             * 查询订单状态 
             */
        	String orderInfo =  appService.queryOrderStatusById(orderId);
        	/**
        	 * 查询物流信息
        	 */
        	String wlInfo =  appService.queryWlInfoByOrderId(orderId);
        	
            return orderInfo+wlInfo;
        }
    
    
    }

package com.spc.hystrix.server.spc_hystrix_server;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.cloud.netflix.hystrix.EnableHystrix;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    @EnableHystrix
    public class RibbonServer {
    
    	public static void main(String[] args) {
    		SpringApplication.run(RibbonServer.class, args);
    	}
    
    	@Bean
    	@LoadBalanced
    	RestTemplate restTemplate() {
    		return new RestTemplate();
    	}
    
    }

//运行结果

1.启动eureka注册中心

2.启动eureka服务spc-service-order开一个服务(端口)即可

3.启动ribbon服务

4.调用测试

5.关闭服务 测试熔断

![70 1][]

![70 2][]

//关闭order服务测试

![70 3][]

========================feign使用熔断=================================

package com.spc.hystrix.server.feign.spc_hystrix_server;
    
    import org.springframework.cloud.netflix.feign.FeignClient;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    
    @FeignClient(value = "SPC-SERVICE-ORDER",fallback = AppServiceImpl.class)
    public interface AppService {
    	
    	@RequestMapping(value = "/queryOrderStatusById", method = RequestMethod.GET)
    	String queryOrderStatusById(@RequestParam(value = "orderId") String orderId);
    	
    }

package com.spc.hystrix.server.feign.spc_hystrix_server;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class AppServiceImpl implements AppService{
    
    	@Override
    	public String queryOrderStatusById(String orderId) {
    		return "Feign_Error:"+orderId+"调用失败:IP:xxxx!!!";
    	}
    
    }

[70]: /images/20220521/dbcc4485f6cd42afb2eea7b03cb8d28d.png
[70 1]: /images/20220521/0c7106d2fcb148f19aef881c29f42293.png
[70 2]: /images/20220521/36be880532484a9c9fb11e0af322de9d.png
[70 3]: /images/20220521/43643cf9a5064fb5b7cd7466e558affc.png