SpringCould总结 | 第五篇 服务调用失败熔断器Hystrix

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

//工程结构

//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

//关闭order服务测试

========================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!!!";
	}

}