<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    <version>最新版本號</version>
</dependency>

# application.properties
spring.cloud.sentinel.transport.dashboard=控制臺地址:端口

spring.cloud.sentinel.transport.dashboard=localhost:8080

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

@RestController
public class HelloController {

    @GetMapping("/hello")
    @SentinelResource(value = "hello", fallback = "handleException")
    public String hello() {
        return "Hello, World!";
    }

    public String handleException(BlockException ex) {
        return "Too many requests, please try again later.";
    }
}

@SpringBootApplication
public class Application implements WebMvcConfigurer {

    public static void main(String[] args) {
        ConfigTransportClient client = SentinelInitHook.init();
        // 如果使用的是Dashboard，則需要連接到Dashboard
        client.setTransportConfig(DashboardTransportProperties.builder()
            .setDashboardServer("localhost", 8080)
            .build());
        
        DegradeRule rule = new DegradeRule();
        rule.setResource("hello");
        rule.setCount(5);
        rule.setGrade(RuleConstant.DEGRADE_GRADE_RT);
        rule.setTimeWindow(10);

        List<DegradeRule> rules = new ArrayList<>();
        rules.add(rule);
        DegradeRuleManager.loadRules(rules);
    }
}