<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    <version>2.2.1.RELEASE</version>
</dependency>

spring.cloud.sentinel.transport.dashboard=http://localhost:8080
spring.cloud.sentinel.transport.port=8719
# Sentinel 控制臺(tái)連接超時(shí)時(shí)間(ms)
spring.cloud.sentinel.transport.dashboard.request-timeout=5000
# 配置資源的默認(rèn)規(guī)則
spring.cloud.sentinel.rules.defaults[0].grade=QPS
spring.cloud.sentinel.rules.defaults[0].count=10

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
public String demoMethod() {
  return "Hello World";
}
public String handleBlock(BlockException ex) {
  return "請(qǐng)求被攔截： " + ex.getClass().getSimpleName();
}

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock", fallbackClass = DemoServiceFallback.class, fallback = "fallback")
public String demoMethod() {
  return "Hello World";
}
public String handleBlock(BlockException ex) {
  return "請(qǐng)求被攔截： " + ex.getClass().getSimpleName();
}

public class DemoServiceFallback {
  public static String fallback() {
    return "請(qǐng)求被熔斷降級(jí)";
  }
}

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
@RateLimiter(10)
public String demoMethod() {
  return "Hello World";
}
public String handleBlock(BlockException ex) {
  return "請(qǐng)求被攔截： " + ex.getClass().getSimpleName();
}

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
@ThreadPool(name = "demoMethod", coreSize = 5, maxQueueSize = 10)
public String demoMethod() {
  return "Hello World";
}
public String handleBlock(BlockException ex) {
  return "請(qǐng)求被攔截： " + ex.getClass().getSimpleName();
}

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
@HotParam(value = "skuId", mode = ParamFlowItem.FlowControlMode.QPS, threshold = 100)
public String demoMethod(@RequestParam Long skuId) {
  return "Hello World";
}

CompletableFuture.supplyAsync(() -> {
  Entry entry = null;
  try {
    entry = SphU.asyncEntry("demoMethod");
    // 異步邏輯
    return "Hello World";
  } catch (BlockException ex) {
    return "blocked by Sentinel: " + ex.getClass().getSimpleName();
  } finally {
    if (entry != null) {
      entry.exit();
    }
  }
}).thenAccept(result -> System.out.println("result: " + result));

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
public void demoMethod(@RequestParam("id") Long id) {
  System.out.println("request id: " + id);
}
@Bean
public RequestOriginParser requestOriginParser() {
  return new DemoRequestOriginParser();
}
public static class DemoRequestOriginParser implements RequestOriginParser {
  @Override
  public String parseOrigin(HttpServletRequest request) {
    String origin = request.getParameter("origin");
    if (StringUtils.isEmpty(origin)) {
      return "unknown";
    }
    return origin;
  }
}
@Configuration
public class SentinelConfig {
  @Autowired
  private RequestOriginParser requestOriginParser;
  @PostConstruct
  public void init() {
    FlowRuleManager.register2(Arrays.asList(
        new FlowRule("demoMethod").setCount(5)
            .setGrade(RuleConstant.FLOW_GRADE_QPS)
            .setLimitApp("default")
            .as(FlowRule.class)
            .setStrategy(RuleConstant.STRATEGY_RELATE)
            .setRefResource("demoDatabase")));
  }
  @Bean
  public SentinelResourceAspect sentinelResourceAspect() {
    return new SentinelResourceAspect();
  }
  @Bean
  public SentinelServletRequestAspect sentinelServletRequestAspect() {
    return new SentinelServletRequestAspect();
  }
}

@SentinelResource(value = "demoMethod", blockHandler = "handleBlock")
public void demoMethod(@RequestBody Map<String, Object> data) {
  System.out.println("request data: " + data);
}
@Configuration
public class SentinelConfig {
  @PostConstruct
  public void init() {
    SystemRuleManager.loadRules(Collections.singletonList(
        new SystemRule()
            .setHighestSystemLoad(1.0)
            .setAvgLoad(0.8)
            .setQps(200))));
    ParamFlowRuleManager.loadRules(Collections.singletonList(
        new ParamFlowRule()
            .setParamIdx(0)
            .setGrade(RuleConstant.FLOW_GRADE_QPS)
            .setCount(5)
            .setDurationInSec(1)
            .setParamFlowItemList(Collections.singletonList(
                new ParamFlowItem().setObject("special_object")
                    .setCount(2)))));
    DegradeRuleManager.loadRules(Collections.singletonList(
        new DegradeRule("demoMethod")
            .setCount(100)
            .setTimeWindow(10)
            .setGrade(RuleConstant.DEGRADE_GRADE_RT)
            .setCount(20)
            .setMinRequestAmount(10))));
    FlowRuleManager.loadRules(Collections.singletonList(
        new FlowRule()
            .setGrade(RuleConstant.FLOW_GRADE_QPS)
            .setResourceRegex("/api/.*")
            .setCount(10)
            .setLimitApp("default")
            .as(FlowRule.class))));
  }
  @Bean
  public SentinelResourceAspect sentinelResourceAspect() {
    return new SentinelResourceAspect();
  }
}

<!-- 引入 Sentinel -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!-- 引入 Spring Cloud Gateway -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>

spring:
  cloud:
    sentinel:
      transport:
        dashboard: localhost:8250
server:
  port: 8080
spring:
  cloud:
    gateway:
      routes:
        - id: test_route
          uri: http://httpbin.org
          predicates:
            - Path=/anything/**

@Bean
public SentinelGatewayFilterFactory sentinelGatewayFilterFactory() {
    return new SentinelGatewayFilterFactory();
}
@Bean
public GatewayFilterChain gatewayFilterChain(RouteLocator routeLocator,
                                             List<GatewayFilterFactory> gatewayFilters) {
    DefaultGatewayFilterChain chain = new DefaultGatewayFilterChain(routeLocator.getRoutes(), gatewayFilters);
    chain.add(0, sentinelGatewayFilterFactory.apply(new Object()));
    return chain;
}

<!-- 引入 Sentinel -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!-- 引入 RocketMQ -->
<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-spring-boot-starter</artifactId>
    <version>2.0.3</version>
</dependency>

spring:
  cloud:
    sentinel:
      transport:
        dashboard: localhost:8250
rocketmq:
  name-server: localhost:9876
  producer:
    group: my-group

@Slf4j
@Service
public class MyProducer {
    @Autowired
    private RocketMQTemplate rocketMQTemplate;
    @PostConstruct
    public void init() {
        // 添加 Sentinel 規(guī)則
        String resourceName = "myTopic:myTag";
        String ruleKey = "myRuleKey";
        int threshold = 100;
        DegradeRule rule = new DegradeRule(resourceName, ruleKey, threshold);
        rule.setGrade(RuleConstant.DEGRADE_GRADE_RT);
        rule.setTimeWindow(10);
        List<DegradeRule> rules = new ArrayList<>();
        rules.add(rule);
        DegradeRuleManager.loadRules(rules);
    }
    public void sendMessage(String message) {
        try {
            rocketMQTemplate.convertAndSend("myTopic", "myTag", message);
        } catch (Exception e) {
            log.error("發(fā)送消息失敗，message: {}", message, e);
        }
    }
}

@Slf4j
@Service
public class MyConsumer {
    @RocketMQMessageListener(topic = "myTopic", consumerGroup = "my-group")
    @SentinelResource(value = "myTopic:myTag", blockHandler = "handleBlockedMessage")
    public void handleMessage(@Payload String message) {
        log.info("接收到消息：{}", message);
    }
    public void handleBlockedMessage(String message, BlockException e) {
        log.error("消息被拒絕，message: {}", message);
    }
}