1、Spring Boot Admin

其实前面我们已经使用了很多 Boot Admin 的案例了，就是项目中使用的 spring-boot-starter-actuator 依赖提供的端点监控，但是它返回的是一个 json 字符串，不方便我们查看使用，所以这里引入了一个新的概念，spring boot admin，通过图形可视化的形式，将各项指标、应用详细情况展示出来，前提是各个应用中使用端点放开了提供数据的配置，例如以下配置，使用 * 就放开了所有配置

management.server.port=9099
management.endpoints.jmx.exposure.include=*
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

实际开发中尽量不要使用 * 通配，不安全，因为暴露了所有的信息

2、构建 Boot Admin 监控端

创建 spring-cloud-alibaba-boot-admin 模块，核心依赖为 spring-boot-admin-starter-server，其他的和之前的一样

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

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

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>${spring-boot-admin.version}</version>
        </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>

修改 application.properties 配置文件

server.port=8088
spring.application.name=spring-cloud-alibaba-boot-admin

management.server.port=9098
management.endpoints.jmx.exposure.include=*
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

# Nacos注册信息
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.nacos.discovery.username=nacos
spring.cloud.nacos.discovery.password=nacos
spring.cloud.nacos.discovery.namespace=sandbox-configuration

启动类增加注解

@EnableDiscoveryClient
@EnableAdminServer

然后启动应用，到这里就构建完成了，是不是特别简单呢，接下来启动应用，访问

http://localhost:8088/

能查到当前应用信息就说明配置 OK 了点击头部的应用墙，然后点击应用，查看当前应用的详细配置

3、构建 Boot Admin 客户端

通常情况下，客户端都是实际的应用，这里就创建一个新的服务，作为模拟实际开发的客户端

创建 spring-cloud-alibaba-boot-admin-client 模块，核心依赖从 server 变成了 client，spring-boot-admin-starter-client 注意一下细节

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

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

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
            <version>${spring-boot-admin.version}</version>
        </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>

修改 application.properties 配置文件，核心配置为最后一句增加了 boot admin 的监控地址

server.port=8089
spring.application.name=spring-cloud-alibaba-boot-admin-client

management.server.port=9099
management.endpoints.jmx.exposure.include=*
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

# Nacos注册信息
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.nacos.discovery.username=nacos
spring.cloud.nacos.discovery.password=nacos
spring.cloud.nacos.discovery.namespace=sandbox-configuration

# Boot Admin监控
spring.boot.admin.client.url=http://localhost:8088