版本清单：

spring-boot-admin-starter-server 2.5.0

spring-boot-admin-starter-client 2.5.0

spring-boot-starter-actuator 2.5.2
springboot 2.5.4

springcloud 2020.0.5

springcloud alibaba 2.2.6.RELEASE

sentinel 1.8.1

gateway 3.0.6

nacos 1.4.2

一、整合spring-boot-admin

1、创建admin-server服务

2、admin-server端引入依赖

<!--admin-->
<dependency>
  <groupId>de.codecentric</groupId>
  <artifactId>spring-boot-admin-starter-server</artifactId>
  <version>2.5.0</version>
</dependency>

<!--nacos-->
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
<!-- web -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

3、配置admin服务端信息

去nacos找注册的服务，本身不注册

server:
  port: 8000
spring:
  application:
    name: amdin
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848 #nacos地址
        register-enabled: false

4、admin服务端启动类

启动当前服务前，先启动nacos

@SpringBootApplication
@EnableAdminServer //启动admin服务端
public class AdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(AdminApplication.class,args);
    }
}

二、整合spring-security配置一个admin服务端登陆页面

1、引入spring-security依赖

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

2、创建spring-security配置类

@Configuration
public class AdminSecurityConfig extends WebSecurityConfigurerAdapter {

    private String adminServerPropertiesContextPath;

    public AdminSecurityConfig( AdminServerProperties adminServerProperties){
        this.adminServerPropertiesContextPath = adminServerProperties.getContextPath();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        SavedRequestAwareAuthenticationSuccessHandler handler = new SavedRequestAwareAuthenticationSuccessHandler();
        handler.setTargetUrlParameter("redirectTo");
        http.authorizeRequests()
                .antMatchers(this.adminServerPropertiesContextPath + "/assets/**").permitAll()
                .antMatchers(this.adminServerPropertiesContextPath + "/login").permitAll()
                .anyRequest().authenticated()
                .and().formLogin().loginPage(this.adminServerPropertiesContextPath + "/login")
                .successHandler(handler)
                .and().logout().logoutUrl(this.adminServerPropertiesContextPath + "/logout")
                .and().httpBasic().and().csrf().disable();
    }
}

3、配置spring-security登录账号密码

server:
  port: 8000
spring:
  application:
    name: amdin
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        register-enabled: false

#添加security配置
  security:
    user:
      name: admin #登录账号
      password: Eshore@189cn #登录密码

4、启动访问并登录admin服务

三、配置微服务的admin-client端

1、微服务引入依赖

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

<!--admin-->
<dependency>
    <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-client</artifactId>
    <version>2.5.0</version>
</dependency>

2、微服务配置admin-client配置信息

spring:
  boot:
    admin:
      client:
        username: admin #server端配置的账号
        password: Eshore@189cn #server端配置的密码
        url: http://127.0.0.1:8000 #admin-server服务信息
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848 #微服务需要注册到nacos中，才能被admin检测到
        
management:
  endpoints:
    web:
      exposure:
        include: '*' #暴露所有路由规则
      base-path: /actuator

3、启动服务

可以看见已在nacos中注册，并且admin已经检测到

nacos：

admin：

四、整合springbootmail实现离线警告

1、admin-server端添加mail依赖

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

2、配置mail信息

server:
  port: 8000 #server端口

spring:
  application:
    name: amdin #server服务名
#mail
  mail:
    host: smtp.yeah.net #邮箱smtp地址 
    username: xxxxx@yeah.net #邮箱地址
    password: XXXXXXXXXXXXXX #邮箱授权码
  boot:
    admin:
      notify:
        mail:
          to: xxxxxxxxxx@qq.com #告警接收端
          from: xxxxxxxxx@yeah.net #告警发送端
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        register-enabled: false
  security:
    user:
      name: admin
      password: Eshore@189cn

3、创建邮箱告警通知类NotificationConfiguration

@Configuration
public class NotificationConfiguration {
    private InstanceRepository instanceRepository;

    private ObjectProvider<List<Notifier>> provider;

    public NotificationConfiguration(InstanceRepository instanceRepository,ObjectProvider<List<Notifier>> provider){
        this.instanceRepository = instanceRepository;
        this.provider = provider;
    }

    @Bean
    public FilteringNotifier getFilterNotifier(){
        CompositeNotifier compositeNotifier = new CompositeNotifier(this.provider.getIfAvailable(Collections::emptyList));
        return new FilteringNotifier(compositeNotifier,this.instanceRepository);
    }

    @Bean
    @Primary
    public RemindingNotifier remindingNotifier(){
        RemindingNotifier remindingNotifier = new RemindingNotifier(getFilterNotifier(), this.instanceRepository);
        remindingNotifier.setReminderPeriod(Duration.ofMinutes(1)); //每一分钟提醒一次
        remindingNotifier.setCheckReminderInverval(Duration.ofSeconds(10)); //每10s检查一次
        return remindingNotifier;
    }
}