前言

本章的内容是在上章的Hystrix一个基础上的一个扩充
重点的话本章是Hystrix与Feign的一个结合
上章情况

本章的大底思路

Hystrix服务集群的搭建

服务名称：microservice-student-provider-hystrix

pom.xml

和之前的不变

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!--保持使用版本的一致1.0-SNAPSHOT-->
    <parent>
        <groupId>com.liwangwang</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-student-provider-hystrix</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--相当于全局的一个依赖关系，这个导入能确保整个项目使用的包版本一致
            比如全局中的： spring-cloud-dependencies
                           spring-boot-dependencies
                           druid-spring-boot-starter

        -->
        <dependency>
            <groupId>com.liwangwang</groupId>
            <artifactId>microservice-common</artifactId>
        </dependency>
        <!--处理web请求-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--test测试的包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--使用的数据库关系映射框架是jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--使用的是mysql数据库-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--使用tomcat-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <!--druid数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <!--  修改后立即生效，热部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <!--需要引入公共模块的实体类等（在导入的时候出现）-->
        <dependency>
            <groupId>com.liwangwang</groupId>
            <artifactId>microservice-common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <!-- actuator监控引入，点击后的追责 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--添加注册中心Eureka相关配置,就是说这个是客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!--Hystrix相关依赖,用来处理服务处理异常情况-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>




    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml文件配置，注意更改名称

---
server:
  port: 1004
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/context?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application: # 设置应用的基本信息(名称
    name: microservice-student
  profiles: provider-hystrix-1004

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1004 #客户端实例名称
    prefer-ip-address: true #是否显示IP
  client:
    service-url:
      #设置与Eureka注册中心交互的地址，是所有注册中心
      defaultZone: http://eureka2001.javawwl.com:2001/eureka/,http://eureka2002.javawwl.com:2002/eureka/,http://eureka2003.javawwl.com:2003/eureka/   #把服务注册到eureka注册中心

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 2000

info:
  groupId: com.liwangwang.springcloud
  artifactId: microservice-student-provider-1004
  version: 1.0-SNAPSHOT
  userName: http://www.javawwl.com
  phone: 123456

---
server:
  port: 1005
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/context?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application: # 设置应用的基本信息(名称
    name: microservice-student
  profiles: provider-hystrix-1005

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1005 #客户端实例名称
    prefer-ip-address: true #是否显示IP
  client:
    service-url:
      #设置与Eureka注册中心交互的地址，是所有注册中心
      defaultZone: http://eureka2001.javawwl.com:2001/eureka/,http://eureka2002.javawwl.com:2002/eureka/,http://eureka2003.javawwl.com:2003/eureka/   #把服务注册到eureka注册中心

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 2000

info:
  groupId: com.liwangwang.springcloud
  artifactId: microservice-student-provider-1005
  version: 1.0-SNAPSHOT
  userName: http://www.javawwl.com
  phone: 123456

---
server:
  port: 1006
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/context?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application: # 设置应用的基本信息(名称
    name: microservice-student
  profiles: provider-hystrix-1006

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1006 #客户端实例名称
    prefer-ip-address: true #是否显示IP
  client:
    service-url:
      #设置与Eureka注册中心交互的地址，是所有注册中心
      defaultZone: http://eureka2001.javawwl.com:2001/eureka/,http://eureka2002.javawwl.com:2002/eureka/,http://eureka2003.javawwl.com:2003/eureka/   #把服务注册到eureka注册中心

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 2000

info:
  groupId: com.liwangwang.springcloud
  artifactId: microservice-student-provider-1006
  version: 1.0-SNAPSHOT
  userName: http://www.javawwl.com
  phone: 123456

main类

package com.liwangwang.microservicestudentproviderhystrix;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableCircuitBreaker
@EntityScan("com.liwangwang.*.*")
@EnableEurekaClient
@SpringBootApplication
public class MicroserviceStudentProviderHystrixApplication {

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

}

重要Controller

package com.liwangwang.microservicestudentproviderhystrix.controller;

import com.liwangwang.microservicecommon.entity.Student;
import com.liwangwang.microservicestudentproviderhystrix.service.StudentService;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/student")
public class StudentProviderController {

    @Value("${server.port}")
    private String port;


    @Autowired
    private StudentService studentService;
     
    @PostMapping(value="/save")
    public boolean save(Student student){
        try{
            studentService.save(student);  
            return true;
        }catch(Exception e){
            return false;
        }
    }
     
    @GetMapping(value="/list")
    public List<Student> list(){
        return studentService.list();
    }
     
    @GetMapping(value="/get/{id}")
    public Student get(@PathVariable("id") Integer id){
        return studentService.findById(id);
    }
     
    @GetMapping(value="/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id){
        try{
            studentService.delete(id);
            return true;
        }catch(Exception e){
            return false;
        }
    }

    @RequestMapping("/ribbon")
    public String ribbon(){
        return "工号【"+port+"】正在为您服务";
    }

    /**
     * 测试Hystrix服务降级
     * @return
     * @throws InterruptedException
     */
//    @HystrixCommand(fallbackMethod="hystrixFallback")
    @GetMapping(value="/hystrix")
    public Map<String,Object> hystrix() throws InterruptedException{
        Thread.sleep(200);

        return studentService.hystrix();
    }

//    public Map<String,Object> hystrixFallback() throws InterruptedException{
//        Map<String,Object> map=new HashMap<String,Object>();
//        map.put("code", 500);
//        map.put("info", "系统【"+port+"】繁忙，稍后重试");
//        return map;
//    }
}

启动后，如此就是注册成功

整合Hystrix与Feign

公共模块(microservice-common)

pom.xml

没有动什么

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!--保持使用版本的一致1.0-SNAPSHOT-->
    <parent>
        <groupId>com.liwangwang</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-common</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--处理web请求-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--test测试的包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--使用的数据库关系映射框架是jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--使用的是mysql数据库-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--引入Feign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>



    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

新创建一个StudentClientFallbackFactory ，
继承于我们写在客户端要调用的service层(StudentClientService)

package com.liwangwang.microservicecommon.service;

import com.liwangwang.microservicecommon.entity.Student;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Component
public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService>  {


    @Override
    public StudentClientService create(Throwable throwable) {
        return new StudentClientService() {
            @Override
            public Student get(Integer id) {
                return null;
            }

            @Override
            public List<Student> list() {
                return null;
            }

            @Override
            public boolean save(Student student) {
                return false;
            }

            @Override
            public boolean delete(Integer id) {
                return false;
            }

            @Override
            public String ribbon() {
                return null;
            }

            @Override
            public Map<String, Object> hystrix() { Map<String,Object> map=new HashMap<String,Object>();
                map.put("code", 500);
                map.put("info", "系统繁忙，稍后重试");
                return map;
            }
        };
    }
}

StudentClientService

package com.liwangwang.microservicecommon.service;

import com.liwangwang.microservicecommon.entity.Student;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;
import java.util.Map;

/**
 * Student Feign接口客户端
 * @author Administrator
 *
 */
@FeignClient(value="MICROSERVICE-STUDENT",fallbackFactory=StudentClientFallbackFactory.class)
public interface StudentClientService {
 
    /**
     * 根据id查询学生信息
     * @param id
     * @return
     */
    @GetMapping(value="/student/get/{id}")
    public Student get(@PathVariable("id") Integer id);
     
    /**
     * 查询学生信息
     * @return
     */
    @GetMapping(value="/student/list")
    public List<Student> list();
     
    /**
     * 添加或者修改学生信息
     * @param student
     * @return
     */
    @PostMapping(value="/student/save")
    public boolean save(Student student);
     
    /**
     * 根据id删除学生信息
     * @return
     */
    @GetMapping(value="/student/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id);

    @RequestMapping("/student/ribbon")
    public String ribbon();
    /**
     * 测试Hystrix服务降级
     * @return
     */
    @GetMapping(value="/student/hystrix")
    public Map<String,Object> hystrix();


}

其他保持不变。

消费者(microservice-student-consumer-feign-80)

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!--保持使用版本的一致1.0-SNAPSHOT-->
    <parent>
        <groupId>com.liwangwang</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-student-consumer-feign-80</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--相当于全局的一个依赖关系，这个导入能确保整个项目使用的包版本一致
            比如全局中的： spring-cloud-dependencies
                           spring-boot-dependencies
                           druid-spring-boot-starter

        -->
        <dependency>
            <groupId>com.liwangwang</groupId>
            <artifactId>microservice-common</artifactId>
        </dependency>
        <!--处理web请求-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--test测试的包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--使用的数据库关系映射框架是jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--使用的是mysql数据库-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--使用tomcat-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <!--  修改后立即生效，热部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <!--需要引入公共模块的实体类等（在导入的时候出现）-->
        <dependency>
            <groupId>com.liwangwang</groupId>
            <artifactId>microservice-common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <!--Eureka的包，我们在这个客户端重点使用的是客户端的包-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <!--使用了ribbon的用法-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <!--引入Feign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>




    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml文件，
此次更改了一个ribbon默认的超时时间
和开启了Hystrix

server:
  port: 80
  context-path: /
eureka:
  client:
    service-url:
      #设置与Eureka注册中心交互的地址，查询服务和注册服务用到
      defaultZone: http://eureka2001.javawwl.com:2001/eureka/,http://eureka2002.javawwl.com:2002/eureka/,http://eureka2003.javawwl.com:2003/eureka/
    register-with-eureka: false     #false 由于该应用为客户端，所以设置为false,代表不向注册中心注册自己。
    fetch-registry: true     #true 由于消费者(客户端)就是寻找服务实例，它需要去检索服务，所以设置为true

#ribbon: # 设置一个前端的失败时间，如果超时，则代表失败
#  ReadTimeout: 100
#  ConnectTimeout: 100
ribbon: # 设置一个前端的失败时间，如果超时，则代表失败
  ReadTimeout: 9000
  ConnectTimeout: 9000

feign:
  hystrix:
    enabled: true

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 2000

main类方法

Controller文件

package com.liwangwang.microservicestudentconsumerfeign80.controller;

import com.liwangwang.microservicecommon.entity.Student;
import com.liwangwang.microservicecommon.service.StudentClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/student")
public class StudentConsumerController {

    @Autowired
    private StudentClientService studentClientService;

    @Autowired
    private RestTemplate restTemplate;

    @PostMapping(value = "/save")
    private boolean save(Student student) {
        return studentClientService.save(student);
    }

    @GetMapping(value = "/list")
    public List<Student> list() {
        return studentClientService.list();
    }

    @GetMapping(value = "/get/{id}")
    public Student get(@PathVariable("id") Integer id) {
        return studentClientService.get(id);
    }

    @GetMapping(value = "/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id) {
        try {
            studentClientService.delete(id);
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    @RequestMapping("/ribbon")
    public String ribbon(){
        return studentClientService.ribbon();
    }

    /**
     * 测试Hystrix服务降级
     * @return
     */
    @GetMapping("/hystrix")
    public Map<String,Object> hystrix(){
        return studentClientService.hystrix();
    }
}

监控服务集群的平台turbine

创建一个项目：microservice-student-consumer-hystrix-turbine-91

pom.xml所需依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-turbine</artifactId>
</dependency>

yml文件的配置
多了turbine和spring.application.name

server:
  port: 91
  context-path: /
eureka:
  client:
    service-url:
      defaultZone: http://eureka2001.javaxl.com:2001/eureka/,http://eureka2002.javaxl.com:2002/eureka/,http://eureka2003.javaxl.com:2003/eureka/
turbine:
  app-config: microservice-student   # 指定要监控的应用名称
  clusterNameExpression: "'default'" #表示集群的名字为default
spring:
  application:
    name: turbine

main主类上加上：

测试
http://localhost:91/turbine.stream

输入http://localhost:90/hystrix进入仪表盘，输入地址

点击后进入

后记

直接放整理
一、Hystrix服务集群(三合一)

操作项目：microservice-student-provider-hystrix（服务者）

与之前的服务集群的搭建相差不大
1、 pom依赖不变
2、 yml文件大致不变，加上profiles:name的唯一标识
3、层次结构方面:
因为上次我们已经把Hystrix的使用方法讲的差不多了，
所以此次的一个要点在于要用Hystrix结合与服务端的Feign来学习

在结构上：我们需要整理一下方法放到service层

在hystrix()方法本体上：去掉@HystrixCommand注解（因为我们会配合Feign来进行降级），把业务逻辑代码放到实现层(impl层)

二、Feign与Hystrix配合使用

1、操作项目为：microservice-common（公共模块层）
因为所有项目的实体类，service层都放到了这里，当然我们也可以把回调的方法放到这里进行一个配置。

① 创建一个新类StudentClientFallbackFactory(一个回调工厂)

继承于我们写在客户端要调用的service层(StudentClientService)

② StudentClientService类加上注解内容

@FeignClient(value=“MICROSERVICESTUDENT”,
fallbackFactory=StudentClientFallbackFactory.class)

OK了，

2、操作项目为: microservice-student-consumer-feign-80(消费者)

① yml文件

加上开启与Hystrix一起使用的配置，和更改一下默认超时时间
ribbon:
ReadTimeout: 9000
ConnectTimeout: 9000

feign:
hystrix:
enabled: true

② main主文件

加上去寻找公共项目的的注解，如果没有的话是没办法调用的。

@ComponentScan(basePackages = “com.liwangwang.microservicecommon”)

额，还有一个给这个项目增加一个请求，要记得

三、监控集群用
没什么特殊的技术点，所以不讲了，看文档安装就行

springcloud的使用Hystrix与Feign的服务集群和监控服务集群的turbine

目录

前言

Hystrix服务集群的搭建

整合Hystrix与Feign

公共模块(microservice-common)

消费者(microservice-student-consumer-feign-80)

监控服务集群的平台turbine

后记

985 硕士程序员，空窗 4 个月没有 Offer！

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