SpringCloud 中 Sentinel 的基本使用

1. 依赖

   <dependency>
       <groupId>com.alibaba.cloud</groupId>
       <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
       <version>2.2.6.RELEASE</version>
   </dependency>
   

2. 配置限流规则

   @PostConstruct
   private static void initFlowRules(){
       List<FlowRule> rules = new ArrayList<>();
       FlowRule rule = new FlowRule();
       //令牌
       rule.setResource("key");
       //限流方式
       rule.setGrade(RuleConstant.FLOW_GRADE_QPS);
       // 设置QPS
       rule.setCount(1);
       rules.add(rule);
       FlowRuleManager.loadRules(rules);
   }
   

3. Service

   @Service
   public class SentinelTestService {
   
       @SentinelResource(value = "key",blockHandler = "failMethod")
       public String getData(){
           return "获取到数据";
       }
   	
       public String failMethod(BlockException blockException){
           return "降级...";
       }
   }
   

4. Controller

   @RestController
   public class SentinelTestController {
   
       @Autowired
       private SentinelTestService sentinelTestService;
   	
       @GetMapping(path = "/test")
       public String test(){
           String data = sentinelTestService.getData();
           System.out.println(data);
           return data;
       }
   	
   }