SpringCloud之Hystrix-Dashboard監控，以及踩的坑...

本文轉載自查看原文 2019-08-25 12:54 1243 開發問題

前言：

最近剛入職，公司使用了SpringCloud，之前有了解過SpringCloud，但是長時間不去搭建不去使用很容易就忘了，因此空閑時間重新復習一下SpringCloud。但是之前開的SpringCloud的版本可能有點低，公司現在用的 " Greenwich.RELEASE "的版本，SpringBoot使用了“ 2.1.x ”的版本，算是比較新了，因此在使用 Hystrix-Dashboard 的時候會有點坑，因此想把踩到的坑記錄下來，讓更多的人避開這個坑，廢話不多說，開始了！

一、創建 Hystrix-Dashboard 監控服務：springcloud-hystrix-dashboard

工程pom依賴

<?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>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gxc.test</groupId>
    <artifactId>springcloud-hystrix-dashboard</artifactId>
    <version>1.0.0</version>

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

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

yml配置文件

server:
  port: 10000
spring:
  application:
    name: springcloud-hystrix-dashboard

在啟動類上添加注解 @EnableHystrixDashboard

@EnableHystrixDashboard
@SpringBootApplication
public class HystrixDashboardApplication {
    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardApplication.class, args);
    }
}

啟動！瀏覽器訪問地址：http://localhost:10000/hystrix ，如下圖：

二、創建Eureka注冊中心：springcloud-eureka-server

有讀者可能會問：不是說玩 Hystrix-Dashboard 嗎？為啥還要用到Eureka？
答：請耐心往下看，這也是我為什么題目說的坑...

工程pom依賴

<?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>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gxc.test</groupId>
    <artifactId>springcloud-hystrix-dashboard</artifactId>
    <version>1.0.0</version>

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

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

yml配置文件

server:
  port: 9000

spring:
  application:
    name: springcloud-eureka-server

eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://127.0.0.1:${server.port}/eureka

啟動類添加注解：@EnableEurekaServer

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

啟動！瀏覽器訪問：http://localhost:9000/ ，如下圖：

三、創建被監控服務：springcloud-user

工程pom依賴

<?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>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gxc.test</groupId>
    <artifactId>springcloud-user</artifactId>
    <version>1.0.0</version>
    <properties>
        <java.version>1.8</java.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-netflix-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

yml配置文件

server:
  port: 10001

spring:
  application:
    name: springcloud-user

# 將服務注冊到Eureka注冊中心
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:9000/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}

feign:
  hystrix:
    enabled: true

啟動類添加注解

//@EnableCircuitBreaker
//@EnableEurekaClient
//@EnableFeignClients
//@SpringBootApplication

// 以上四個注解可以用如下兩個注解取代
@EnableFeignClients
@SpringCloudApplication
public class UserApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserApplication.class, args);
    }
}

創建測試Controller類

@RestController
public class UserController {
    @GetMapping("/user")
    public Object getUser() {
        Map<String, Object> user = Maps.newHashMap();
        user.put("username","GongXincheng");
        user.put("age", 23);
        user.put("birthday", new Date());
        return user;
    }
}

啟動！瀏覽器訪問：http://localhost:10001/user，如下圖：

四、測試 Hystrix-Dashboard 監控 user 服務

瀏覽器訪問：http://localhost:10001/hystrix.stream ，出現了404錯誤
說明：第一個坑，在SpringBoot 2.0之前，只要添加了Actuator依賴，不會出現404錯誤的
解決404問題：創建一個配置類，並注冊一個Servlet

@Configuration
public class ServletConfigBean {
    @Bean
    public ServletRegistrationBean hystrixMetricsStreamServlet() {
        ServletRegistrationBean regist = new ServletRegistrationBean();
        regist.setServlet(new HystrixMetricsStreamServlet());
        regist.setName("hystrixMetricsStreamServlet");
        regist.setLoadOnStartup(1);
        regist.addUrlMappings("/hystrix.stream");
        return regist;
    }
}

瀏覽器訪問：http://localhost:10001/hystrix.stream ，如下圖：
將第一步的鏈接：http://localhost:10001/hystrix.stream ，復制到 Hystrix-Dashboard頁面中
Hystrix-Dashboard會一直在 loading... 中，這就是第二個坑...
解決辦法：

1：創建另一個服務（例如：springcloud-order）
2：將新的服務（order）注冊到Eureka
3：在user服務寫一個新的Api接口，通過 Feign 訪問新服務（order）的Api接口
4：注意：經過本人測試通過RestTemplate的方式調用，仍然沒有效果。
5：當通過Feign調用一次新服務（order）后，hystrix.stream 正常，效果如下：

Controller層代碼

@RestController
public class UserController {

    private static final String ORDER_SERVER_URL = "http://springcloud-order";

    @Resource private OrderFeign orderFeign;
    @Resource private RestTemplate restTemplate;

    @GetMapping("/user")
    public Object getUser() {
        Map<String, Object> user = Maps.newHashMap();
        user.put("username","GongXincheng");
        user.put("age", 23);
        user.put("birthday", new Date());
        return user;
    }

    @GetMapping("/feign/order")
    public Object feignGetOrder() {
        return orderFeign.getOrder();
    }

    @GetMapping("/rest/order")
    public Object restGetOrder() {
        return restTemplate.getForObject(ORDER_SERVER_URL + "/order", Object.class);
    }
}

8：user服務和oder服務目錄結構和相關代碼

五：代碼鏈接

https://gitee.com/gxc6/gxc-springcloud-study

如果有什么錯誤的地方，歡迎大家幫忙指正！感謝！

我透... 寫完這個已經凌晨3點了... 溜了溜了...

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