Resilience4J和sentinel 实现单点限流 java代码

import com.alibaba.csp.sentinel.Entry;
 import com.alibaba.csp.sentinel.SphU;
 import com.alibaba.csp.sentinel.slots.block.BlockException;
 import com.alibaba.csp.sentinel.slots.block.RuleConstant;
 import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
 import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
  
 import java.util.ArrayList;
 import java.util.List;
  
 public class SentinelRateLimiterExample {
  
     static {
         // 配置限流规则
         List<FlowRule> rules = new ArrayList<>();
         FlowRule rule = new FlowRule();
         rule.setResource("backendName");
         rule.setGrade(RuleConstant.FLOW_GRADE_QPS);
         rule.setCount(5); // 每秒最多允许5个请求
         rules.add(rule);
  
         FlowRuleManager.loadRules(rules);
     }
  
     public static void main(String[] args) {
         // 使用Sentinel进行限流
         try (Entry entry = SphU.entry("backendName")) {
             // 业务逻辑
             System.out.println("Call is permitted");
         } catch (BlockException e) {
             // 当请求被限流时的处理逻辑
             System.out.println("Not permitted to call");
         }
     }
 }