003 springCloudAlibaba Sentinel blockHandler fallback

package com.example.controller; import com.alibaba.csp.sentinel.annotation.SentinelResource; import com.alibaba.csp.sentinel.slots.block.BlockException; import com.example.entity.Product; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("product") public class ProductController { @Value("${server.port}") private Integer serverPort; @GetMapping("/{proId}") @SentinelResource(value = "getById",blockHandler = "handleBlock",fallback = "handleFallback") public String getById(@PathVariable("proId") Integer proId){ Product product = new Product(proId,"保温杯",69.9F,"images/cup.png"); System.out.println("商品服务"+serverPort+"正在查询商品:"+proId); int i = 10/0; return product.toString(); } /** * 违背流控规则,blockHandler * product/{proId} * 有流控规则,QPS <= 1 * 若超过流量阈值，blockHandler */ public String handleBlock(@PathVariable("proId") Integer proId, BlockException exception) { return "商品查询请求QPS>1,超过流量阈值"; } /** * 业务有异常,fallback */ public String handleFallback(@PathVariable("proId") Integer proId,Throwable e) { Product product = new Product(); product.setProductId(proId); product.setProducutName("保温杯"); return "[fallback]商品查询的信息是:" + product; } }