+------------------+     +---------------------+
|  Spring Boot     |     |  Spring Boot        |
|  Application     |<--->|  Admin Client       |
|  (Client)        |     |  (Actuator暴露)      |
+------------------+     +----------+----------+
                                    |
                                    | HTTP輪詢
                                    v
                          +---------+----------+
                          | Spring Boot Admin  |
                          | Server (UI + API)  |
                          +---------+----------+
                                    |
                                    v
                         [持久化存儲] ←→ [通知系統(tǒng)]

<!-- pom.xml -->
<dependencies>
    <dependency>
        <groupId>de.codecentric</groupId>
        <artifactId>spring-boot-admin-starter-server</artifactId>
        <version>3.2.0</version> <!-- 推薦使用最新穩(wěn)定版 -->
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- 安全認證（可選） -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
</dependencies>

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

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

<dependency>
    <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-client</artifactId>
    <version>3.2.0</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

spring:
  boot:
    admin:
      client:
        url: http://localhost:8080         # SBA Server 地址
        username: admin                    # 若啟用了安全認證
        password: secret
  application:
    name: user-service                     # 應用名稱（顯示在列表中）
# 暴露所有 Actuator 端點
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: always
    env:
      enabled: true
    heapdump:
      enabled: true
    threaddump:
      enabled: true
    loggers:
      enabled: true
    metrics:
      enabled: true

management:
  trace:
    http:
      include: "timestamp,request,response,headers,time-taken"

@Component
public class CustomHealthIndicator implements HealthIndicator {
    @Override
    public Health health() {
        return Health.up()
            .withDetail("version", "1.0.0")
            .withDetail("uptime", System.currentTimeMillis())
            .build();
    }
}

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

@Configuration
@EnableWebSecurity
public class SecurityConfig {
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authz -> authz
                .requestMatchers("/assets/**", "/login", "/actuator/**").permitAll()
                .anyRequest().authenticated()
            )
            .formLogin(form -> form.loginPage("/login").permitAll())
            .logout(logout -> logout.logoutSuccessUrl("/"));
        return http.build();
    }
    @Bean
    public UserDetailsService userDetailsService() {
        UserDetails admin = User.withDefaultPasswordEncoder()
            .username("admin")
            .password("secret")
            .roles("USER", "ADMIN")
            .build();
        return new InMemoryUserDetailsManager(admin);
    }
}

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/sba?useSSL=false&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

@Component
public class NotifyListener {
    @EventListener
    public void onInstanceStatusChanged(StatusChangeEvent event) {
        String status = event.getStatusInfo().getStatus();
        String appName = event.getInstance().getRegistration().getName();
        if ("DOWN".equals(status)) {
            sendEmail("?? 應用 " + appName + " 已宕機！", event.toString());
        }
    }
    private void sendEmail(String subject, String body) {
        // 使用 JavaMailSender 發(fā)送郵件
    }
}

management:
  metrics:
    export:
      prometheus:
        enabled: true
  endpoints:
    web:
      exposure:
        include: prometheus

spring-boot-admin-demo/
├── admin-server/                 # SBA Server
│   ├── src/main/resources/application.yml
│   └── AdminServerApplication.java
│
├── user-service/                 # Client 示例
│   ├── src/main/resources/application.yml
│   └── UserServiceApplication.java
│
└── docker-compose.yml            # 一鍵啟動 MySQL + SBA + Client