在前面的文章中，我们涉及到了Spring Boot Actuator组件，该组件用来监控系统运行状态，不过，貌似该组件显示的信息是以文本的形式展示的，对于我们查看不太方便，为此spring cloud提供了一个更强大的监控组件Spring Boot Admin，以可视化的形式显示监控状态
微服务ralab-admin

• New microservice ‘ralab-admin’ and and add the Maven spring-boot-admin-starter-server denpendencys
• Add @EnableAdminServer to the application class
• Config Spring Boot Admin info to application.yml file
  其pom.xml文件如下：

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  <?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>2.1.8.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.ralab</groupId> <artifactId>ralab-admin</artifactId> <version>0.0.1-SNAPSHOT</version> <name>ralab-admin</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-boot-admin.version>2.1.5</spring-boot-admin.version> </properties> <dependencies> <dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-starter-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-dependencies</artifactId> <version>${spring-boot-admin.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>

RalabAdminApplication文件

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package com.ralab.ralabadmin;

import de.codecentric.boot.admin.server.config.EnableAdminServer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableAdminServer
public class RalabAdminApplication {

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

}

application.yml

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server:
  port: 8080
spring:
  application:
    name: service-admin

运行RalabAdminApplication，打开http://127.0.0.1:8080
然后我们新建被监控端微服务，引入spring-boot-admin-client依赖，其pom.xml文件如下：

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<?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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo2</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.5</spring-boot-admin.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>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.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>

application.yml配置

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server:
  port: 8091
spring:
  application:
    name: web_a
  boot:
    admin:
      client:
        instance:
          prefer-ip: true
        url: http://127.0.0.1:8080  #配置需要接入的admin-server地址

management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: always

运行Demo2Application，这时我们可以看到监控状态信息http://127.0.0.1:8080