SpringCloud系列（30）--准备使用Hystrix的前期工作，创建服务消费者模块

前言：在上一章节中我们创建了服务提供者模块，而本节内容则是创建服务消费者模块。

1、创建一个服务提供者模块，命名为cloud-consumer-feign-hystrix-order80

(1)在父工程下新建模块

(2)选择模块的项目类型为Maven并选择模块要使用的JDK版本

(3)填写子模块的名称，然后点完成即可完成创建

效果图：

(4)修改cloud-consumer-feign-hystrix-order80子模块的pom.xml文件，然后reolad一下，下载依赖

例：

<?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">
    <parent>
        <artifactId>springcloud01</artifactId>
        <groupId>com.ken.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-feign-hystrix-order80</artifactId>

    <dependencies>
        <!--OpenFeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--hystrix-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <!--以下依赖都没写版本号，没写版本号的情况下会引用父项目的版本-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!--lombok插件-->
        <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>
        <!--引入自己定义的api调用包，可以使用Payment模块的entity-->
        <dependency>
            <groupId>com.ken.springcloud</groupId>
            <artifactId>api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!--Eureka Clinet-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
</project>

2、为子模块添加名为application的yml配置文件（注：yml是官方推荐的配置文件格式，最好使用yml文件而不是properties文件）

效果图：

3、修改application.yml文件配置

server:
  port: 8080
eureka:
  client:
    #表示是否将自己注册进Eureka Server里，默认为true
    register-with-eureka: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/

4、为cloud-consumer-feign-hystrix-order80子模块新建一个主启动类，类名输入com.ken.springcloud.OrderHystrixMain80，然后创建即可

效果图：

5、编写OrderHystrixMain80主启动类

package com.ken.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
//使用Feign，激活并开启
@EnableFeignClients
public class OrderHystrixMain80 {

    public static void main(String[] args) {
        SpringApplication.run(OrderHystrixMain80.class, args);
    }

}

6、在com.ken.springcloud包下新建一个名为service的包

效果图：

7、在service包下新建一个名为PaymentHystrixService的接口类

效果图：

8、编写PaymentHystrixService接口类

package com.ken.springcloud.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@Component
//这里@FeignClient里写的是指定要访问的微服务的名称，表示通过FeignClient去Eureka上面找名称为CLOUD-PROVIDER-HYSTRIX-PAYMENT的微服务的接口
@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT")
public interface PaymentHystrixService {

    //指明要调用的CLOUD-PROVIDER-HYSTRIX-PAYMENT的微服务的接口，这里调用的是PaymentController类里的/payment/hystrix/ok/{id}接口
    @GetMapping("/payment/hystrix/ok/{id}")
    public String paymentInfoOK(@PathVariable("id") Integer id);

    //指明要调用的CLOUD-PROVIDER-HYSTRIX-PAYMENT的微服务的接口，这里调用的是PaymentController类里的/payment/hystrix/timeout/{id}接口
    @GetMapping("/payment/hystrix/timeout/{id}")
    public String paymentInfoTimeOut(@PathVariable("id") Integer id);

}

9、在com.ken.springcloud包下新建一个名为controller的包

效果图：

10、在controller包下新建一个名为OrderHystrixController的控制类

效果图：

11、编写OrderHystrixController类

package com.ken.springcloud.controller;

import com.ken.springcloud.service.PaymentHystrixService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class OrdertHystrixController {

    @Resource
    private PaymentHystrixService paymentHystrixService;

    @GetMapping("/consumer/payment/hystrix/ok/{id}")
    public String paymentInfoOK(@PathVariable("id") Integer id) {
        String result = paymentHystrixService.paymentInfoOK(id);
        return result;
    }

    @GetMapping("/consumer/payment/hystrix/timeout/{id}")
    public String paymentInfoTimeOut(@PathVariable("id") Integer id) {
        String result = paymentHystrixService.paymentInfoTimeOut(id);
        return result;
    }

}