一、feign 申明式客户端接口

微服务利用中，ribbon 和 hystrix 总是同时呈现，feign 整合了两者，并提供了申明式消费者客户端

  • 用 feign 代替 hystrix+ribbon

1. 新建 sp09-feign 我的项目

2. 增加依赖

<?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>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.2.1.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>cn.tedu</groupId>    <artifactId>sp09-feign</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>sp09-feign</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>        <spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</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-netflix-eureka-client</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-openfeign</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>            <exclusions>                <exclusion>                    <groupId>org.junit.vintage</groupId>                    <artifactId>junit-vintage-engine</artifactId>                </exclusion>            </exclusions>        </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>

3. 批改application.yml文建

spring:  application:    name: feign    server:  port: 3001  eureka:  client:    service-url:      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka

4. 主程序增加 @EnableFeignClients注解

package cn.tedu.sp09;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@EnableFeignClients@EnableDiscoveryClient@SpringBootApplicationpublic class Sp09FeignApplication {    public static void main(String[] args) {        SpringApplication.run(Sp09FeignApplication.class, args);    }}

5. feign 申明式客户端

feign 利用了咱们相熟的 spring mvc 注解来对接口办法进行设置，升高了咱们的学习老本。
通过这些设置,feign能够拼接后盾服务的拜访门路和提交的参数

例如：@GetMapping("/{userId}/score") JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);

当这样调用该办法：

service.addScore(7, 100);

那么 feign 会向服务器发送申请：

http://用户微服务/7/score?score=100
  • 留神：如果 score 参数名与变量名不同，须要增加参数名设置：
@GetMapping("/{userId}/score") JsonResult addScore(@PathVariable Integer userId, @RequestParam("score") Integer s);

5.1 ItemFeignService

package cn.tedu.sp09.service;import java.util.List;import org.springframework.cloud.openfeign.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.RequestBody;import cn.tedu.sp01.pojo.Item;import cn.tedu.web.util.JsonResult;@FeignClient("item-service")public interface ItemFeignService {    @GetMapping("/{orderId}")    JsonResult<List<Item>> getItems(@PathVariable String orderId);    @PostMapping("/decreaseNumber")    JsonResult decreaseNumber(@RequestBody List<Item> items);}

5.2 UserFeignService

  • 留神,如果申请参数名与办法参数名不同,@RequestParam不能省略,并且要指定申请参数名:
    @RequestParam("score") Integer s
package cn.tedu.sp09.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestParam;import cn.tedu.sp01.pojo.User;import cn.tedu.web.util.JsonResult;@FeignClient("user-service")public interface UserFeignService {    @GetMapping("/{userId}")    JsonResult<User> getUser(@PathVariable Integer userId);    // 拼接门路 /{userId}/score?score=新增积分    @GetMapping("/{userId}/score")     JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);

5.3 OrderFeignService

package cn.tedu.sp09.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import cn.tedu.sp01.pojo.Order;import cn.tedu.web.util.JsonResult;@FeignClient("order-service")public interface OrderFeignService {    @GetMapping("/{orderId}")    JsonResult<Order> getOrder(@PathVariable String orderId);    @GetMapping("/")    JsonResult addOrder();}

5.4 FeignController

package cn.tedu.sp09.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;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.RequestBody;import org.springframework.web.bind.annotation.RestController;import cn.tedu.sp01.pojo.Item;import cn.tedu.sp01.pojo.Order;import cn.tedu.sp01.pojo.User;import cn.tedu.sp09.service.ItemFeignService;import cn.tedu.sp09.service.OrderFeignService;import cn.tedu.sp09.service.UserFeignService;import cn.tedu.web.util.JsonResult;@RestControllerpublic class FeignController {    @Autowired    private ItemFeignService itemService;    @Autowired    private UserFeignService userService;    @Autowired    private OrderFeignService orderService;    @GetMapping("/item-service/{orderId}")    public JsonResult<List<Item>> getItems(@PathVariable String orderId) {        return itemService.getItems(orderId);    }    @PostMapping("/item-service/decreaseNumber")    public JsonResult decreaseNumber(@RequestBody List<Item> items) {        return itemService.decreaseNumber(items);    }    @GetMapping("/user-service/{userId}")    public JsonResult<User> getUser(@PathVariable Integer userId) {        return userService.getUser(userId);    }    @GetMapping("/user-service/{userId}/score")     public JsonResult addScore(@PathVariable Integer userId, Integer score) {        return userService.addScore(userId, score);    }    @GetMapping("/order-service/{orderId}")    public JsonResult<Order> getOrder(@PathVariable String orderId) {        return orderService.getOrder(orderId);    }    @GetMapping("/order-service")    public JsonResult addOrder() {        return orderService.addOrder();    }}

6.启动服务，并拜访测试

  • http://eureka1:2001
  • http://localhost:3001/item-service/35
  • http://localhost:3001/item-service/decreaseNumber
    应用postman，POST发送以下格局数据：
    [{"id":1, "name":"abc", "number":23},{"id":2, "name":"def", "number":11}]
  • http://localhost:3001/user-service/7
  • http://localhost:3001/user-service/7/score?score=100
  • http://localhost:3001/order-service/123abc
  • http://localhost:3001/order-service/

二、feign + ribbon 负载平衡和重试

  • 无需额定配置，feign 默认已启用了 ribbon 负载平衡和重试机制。能够通过配置对参数进行调整

重试的默认配置参数:

ConnectTimeout=1000ReadTimeout=1000MaxAutoRetries=0MaxAutoRetriesNextServer=1

1.application.yml 配置 ribbon 超时和重试

  • ribbon.xxx 全局配置
  • item-service.ribbon.xxx 对特定服务实例的配置
spring:  application:    name: feign    server:  port: 3001  eureka:  client:    service-url:      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka      ribbon:  ConnectTimeout: 1000  ReadTimeout: 1000  item-service:  ribbon:    MaxAutoRetries: 1    MaxAutoRetriesNextServer: 2    ConnectTimeout: 1000    ReadTimeout: 500

2.启动服务，拜访测试

http://localhost:3001/item-service/35

三、feign + hystrix 降级

feign 默认没有启用 hystrix，增加配置，启用 hystrix

1. application.yml 增加配置

feign:  hystrix:    enabled: true

启用 hystrix 后，拜访服务
http://localhost:3001/item-service/35
默认1秒会疾速失败，没有降级办法时，会显示白板页

1.1 能够增加配置，临时减小降级超时工夫，以便后续对降级进行测试

feign:  hystrix:    enabled: true    hystrix:  command:    default:      execution:        isolation:          thread:            timeoutInMilliseconds: 500

2. 指定降级类

近程调用失败, 会执行降级类中的代码

2.1 ItemFeignService

@FeignClient(name="item-service", fallback = ItemFeignServiceFB.class)public interface ItemFeignService {

2.2 UserFeignService

@FeignClient(name="user-service", fallback = UserFeignServiceFB.class)public interface UserFeignService {

2.3 OrderFeignService

@FeignClient(name="order-service",fallback = OrderFeignServiceFB.class)public interface OrderFeignService {

2.4 降级类

降级类须要实现近程接口

2.4.1 ItemFeignServiceFB

package cn.tedu.sp09.service;import java.util.List;import org.springframework.stereotype.Component;import cn.tedu.sp01.pojo.Item;import cn.tedu.web.util.JsonResult;@Componentpublic class ItemFeignServiceFB implements ItemFeignService {    @Override    public JsonResult<List<Item>> getItems(String orderId) {        return JsonResult.err("无奈获取订单商品列表");    }    @Override    public JsonResult decreaseNumber(List<Item> items) {        return JsonResult.err("无奈批改商品库存");    }}

2.4.2UserFeignServiceFB

package cn.tedu.sp09.service;import org.springframework.stereotype.Component;import cn.tedu.sp01.pojo.User;import cn.tedu.web.util.JsonResult;@Componentpublic class UserFeignServiceFB implements UserFeignService {    @Override    public JsonResult<User> getUser(Integer userId) {        return JsonResult.err("无奈获取用户信息");    }    @Override    public JsonResult addScore(Integer userId, Integer score) {        return JsonResult.err("无奈减少用户积分");    }}

2.4.3 OrderFeignServiceFB

package cn.tedu.sp09.service;import org.springframework.stereotype.Component;import cn.tedu.sp01.pojo.Order;import cn.tedu.web.util.JsonResult;@Componentpublic class OrderFeignServiceFB implements OrderFeignService {    @Override    public JsonResult<Order> getOrder(String orderId) {        return JsonResult.err("无奈获取商品订单");    }    @Override    public JsonResult addOrder() {        return JsonResult.err("无奈保留订单");    }}

3. 启动服务，拜访测试

http://localhost:3001/item-service/35

四、feign + hystrix 监控和熔断测试

1.pom.xml 增加 hystrix 起步依赖

<dependency>    <groupId>org.springframework.cloud</groupId>    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId></dependency>

2. 主程序增加 @EnableCircuitBreaker

package cn.tedu.sp09;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@EnableCircuitBreaker@EnableFeignClients@EnableDiscoveryClient@SpringBootApplicationpublic class Sp09FeignApplication {    public static void main(String[] args) {        SpringApplication.run(Sp09FeignApplication.class, args);    }}

3. 配置 actuator依赖

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

4. application.yml裸露 hystrix.stream 监控端点

management:  endpoints:    web:      exposure:        include: hystrix.stream

5. 启动服务，查看监控端点

http://localhost:3001/actuator

5.1 hystrix dashboard

启动 hystrix dashboard 服务，填入 feign 监控门路，开启监控
拜访 http://localhost:4001/hystrix

  • 填入 feign 监控门路:
    http://localhost:3001/actuator/hystrix.stream
  • 拜访微服务，以产生监控数据

http://localhost:3001/item-service/35
http://localhost:3001/user-service/7
http://localhost:3001/user-service/7/score?score=100
http://localhost:3001/order-service/123abc
http://localhost:3001/order-service/

5.2 熔断测试

  • 用 ab 工具，以并发50次，来发送20000个申请
ab -n 20000 -c 50 http://localhost:3001/item-service/35
  • 断路器状态为 Open，所有申请会被短路，间接降级执行 fallback 办法

五、order service 调用商品库存服务和用户服务

批改 sp04-orderservice 我的项目，增加 feign，调用 item service 和 user service

1. 增加依赖

  • actuator
  • feign
  • hystrix
<?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>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.2.1.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>cn.tedu</groupId>    <artifactId>sp04-orderservice</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>sp04-orderservice</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>            <exclusions>                <exclusion>                    <groupId>org.junit.vintage</groupId>                    <artifactId>junit-vintage-engine</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>cn.tedu</groupId>            <artifactId>sp01-commons</artifactId>            <version>0.0.1-SNAPSHOT</version>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>                spring-cloud-starter-netflix-eureka-client            </artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>                spring-cloud-starter-netflix-hystrix            </artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-openfeign</artifactId>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>Hoxton.RELEASE</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement></project>

2. 批改 application.yml 文件

  • ribbon 重试和 hystrix 超时这里没有设置，采纳了默认值
spring:  application:    name: order-service    server:  port: 8201    eureka:  client:    service-url:      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka      feign:  hystrix:    enabled: true    management:  endpoints:    web:      exposure:        include: hystrix.stream

3. 主程序增加 @EnableFeignClients 注解

package cn.tedu.sp04;import org.springframework.boot.SpringApplication;import org.springframework.cloud.client.SpringCloudApplication;import org.springframework.cloud.openfeign.EnableFeignClients;//@EnableDiscoveryClient//@SpringBootApplication@EnableFeignClients@SpringCloudApplicationpublic class Sp04OrderserviceApplication {    public static void main(String[] args) {        SpringApplication.run(Sp04OrderserviceApplication.class, args);    }}

4. 指定降级类

4.1 ItemFeignService

package cn.tedu.sp04.order.feignclient;import java.util.List;import org.springframework.cloud.openfeign.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.RequestBody;import cn.tedu.sp01.pojo.Item;import cn.tedu.web.util.JsonResult;@FeignClient(name="item-service", fallback = ItemFeignServiceFB.class)public interface ItemFeignService {    @GetMapping("/{orderId}")    JsonResult<List<Item>> getItems(@PathVariable String orderId);    @PostMapping("/decreaseNumber")    JsonResult decreaseNumber(@RequestBody List<Item> items);}

4.2 UserFeignService

package cn.tedu.sp04.order.feignclient;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestParam;import cn.tedu.sp01.pojo.User;import cn.tedu.web.util.JsonResult;@FeignClient(name="user-service", fallback = UserFeignServiceFB.class)public interface UserFeignService {    @GetMapping("/{userId}")    JsonResult<User> getUser(@PathVariable Integer userId);    @GetMapping("/{userId}/score")     JsonResult addScore(@PathVariable Integer userId, @RequestParam Integer score);}

4.3ItemFeignServiceFB

  • 获取商品列表的降级办法，模仿应用缓存数据
package cn.tedu.sp04.order.feignclient;import java.util.Arrays;import java.util.List;import org.springframework.stereotype.Component;import cn.tedu.sp01.pojo.Item;import cn.tedu.web.util.JsonResult;@Componentpublic class ItemFeignServiceFB implements ItemFeignService {    @Override    public JsonResult<List<Item>> getItems(String orderId) {        if(Math.random()<0.5) {            return JsonResult.ok().data(                Arrays.asList(new Item[] {                        new Item(1,"缓存aaa",2),                        new Item(2,"缓存bbb",1),                        new Item(3,"缓存ccc",3),                        new Item(4,"缓存ddd",1),                        new Item(5,"缓存eee",5)                })            );        }        return JsonResult.err("无奈获取订单商品列表");    }    @Override    public JsonResult decreaseNumber(List<Item> items) {        return JsonResult.err("无奈批改商品库存");    }}

5. 降级类

5.1 UserFeignServiceFB

  • 获取用户信息的降级办法，模仿应用缓存数据
package cn.tedu.sp04.order.feignclient;import org.springframework.stereotype.Component;import cn.tedu.sp01.pojo.User;import cn.tedu.web.util.JsonResult;@Componentpublic class UserFeignServiceFB implements UserFeignService {    @Override    public JsonResult<User> getUser(Integer userId) {        if(Math.random()<0.4) {            return JsonResult.ok(new User(userId, "缓存name"+userId, "缓存pwd"+userId));        }        return JsonResult.err("无奈获取用户信息");    }    @Override    public JsonResult addScore(Integer userId, Integer score) {        return JsonResult.err("无奈减少用户积分");    }}

5.2 OrderServiceImpl

package cn.tedu.sp04.order.service;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import cn.tedu.sp01.pojo.Item;import cn.tedu.sp01.pojo.Order;import cn.tedu.sp01.pojo.User;import cn.tedu.sp01.service.OrderService;import cn.tedu.sp04.order.feignclient.ItemFeignService;import cn.tedu.sp04.order.feignclient.UserFeignService;import cn.tedu.web.util.JsonResult;import lombok.extern.slf4j.Slf4j;@Slf4j@Servicepublic class OrderServiceImpl implements OrderService {    @Autowired    private ItemFeignService itemService;    @Autowired    private UserFeignService userService;    @Override    public Order getOrder(String orderId) {        //调用user-service获取用户信息        JsonResult<User> user = userService.getUser(7);        //调用item-service获取商品信息        JsonResult<List<Item>> items = itemService.getItems(orderId);        Order order = new Order();        order.setId(orderId);        order.setUser(user.getData());        order.setItems(items.getData());        return order;    }    @Override    public void addOrder(Order order) {        //调用item-service缩小商品库存        itemService.decreaseNumber(order.getItems());                //TODO: 调用user-service减少用户积分        userService.addScore(7, 100);        log.info("保留订单："+order);    }}

6. order-service 配置启动参数,启动两台服务器

  • --server.port=8201
  • --server.port=8202

7. 启动服务，拜访测试

  • 依据orderid，获取订单
    http://localhost:8201/123abc
    http://localhost:8202/123abc
  • 保留订单
    http://localhost:8201/
    http://localhost:8202/

hystrix dashboard 监控 order service 断路器

  • 拜访 http://localhost:4001/hystrix ，填入 order service 的断路器监控门路，启动监控
  • http://localhost:8201/actuator/hystrix.stream
  • http://localhost:8202/actuator/hystrix.stream

六、hystrix + turbine 集群聚合监控

hystrix dashboard 一次只能监控一个服务实例，应用 turbine 能够会集监控信息，将聚合后的信息提供给 hystrix dashboard 来集中展现和监控

1. 新建 sp10-turbine 我的项目

2.增加依赖

<?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>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.2.1.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>cn.tedu</groupId>    <artifactId>sp10-turbine</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>sp10-turbine</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>        <spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-turbine</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>            <exclusions>                <exclusion>                    <groupId>org.junit.vintage</groupId>                    <artifactId>junit-vintage-engine</artifactId>                </exclusion>            </exclusions>        </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>

3.批改 application.yml 文件

spring:  application:    name: turbin    server:  port: 5001  eureka:  client:    service-url:      defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka      turbine:  app-config: order-service  cluster-name-expression: new String("default")`

4. 主程序

增加 @EnableTurbine 和 @EnableDiscoveryClient 注解

package cn.tedu.sp10;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.netflix.turbine.EnableTurbine;@EnableTurbine@EnableDiscoveryClient@SpringBootApplicationpublic class Sp10TurbineApplication {    public static void main(String[] args) {        SpringApplication.run(Sp10TurbineApplication.class, args);    }}

5.拜访测试

  • 8201服务器产生监控数据:
    http://localhost:8201/abc123
    http://localhost:8201/
  • 8202服务器产生监控数据:
    http://localhost:8202/abc123
    http://localhost:8202/
  • turbine 监控门路
    http://localhost:5001/turbine.stream
  • 在 hystrix dashboard 中填入turbine 监控门路，开启监控
    http://localhost:4001/hystrix
  • turbine聚合了order-service两台服务器的hystrix监控信息