sentinel上下文配置（玩转Sentinel定义异常-整合Open-Feign）

AlibabaCloud版本升级-⾃定义降级异常不向下兼容的坑

默认降级返回数据问题

限流和熔断返回的数据有问题
微服务交互基本都是json格式，如果让⾃定义异常信息

AlibabCloud版本升级，不兼容问题

v2.1.0到v2.2.0后，Sentinel⾥⾯依赖进⾏了改动，且不向下兼容

⾃定义降级返回数据

【旧版】实现UrlBlockHandler并且重写blocked⽅法

@Component public class XdclassUrlBlockHandler implements UrlBlockHandler { @Override public void blocked(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws IOException { //降级业务处理 } }

【新版】实现BlockExceptionHandler并且重写handle⽅法

public class XdclassUrlBlockHandler implements BlockExceptionHandler { @Override public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws Exception { //降级业务处理 } }

新版sentinel⾃定义降级异常数据开发实战

异常种类

FlowException //限流异常
DegradeException //降级异常
ParamFlowException //参数限流异常
SystemBlockException //系统负载异常
AuthorityException //授权异常

【新版】实现BlockExceptionHandler并且重写handle⽅法

@Component public class AlibabaUrlBlockHandler implements BlockExceptionHandler { @Override public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception { Map<String,Object> result = new HashMap<>(); if (e instanceof FlowException){ result.put("code",-1); result.put("message","限流异常！"); } else if (e instanceof DegradeException){ result.put("code",-2); result.put("message","降级异常！"); } else if (e instanceof ParamFlowException){ result.put("code",-3); result.put("message","热点异常！"); } else if (e instanceof SystemBlockException){ result.put("code",-4); result.put("message","系统规则异常！"); } else if (e instanceof AuthorityException){ result.put("code",-5); result.put("message","认证异常！"); } //设置返回数据 response.setStatus(200); response.setHeader("content-type","application/json;charset=UTF-8"); response.getWriter().write(JSON.toJSONString(result)); } }

降级测试

sentinel上下文配置（玩转Sentinel定义异常-整合Open-Feign）(1)

sentinel上下文配置（玩转Sentinel定义异常-整合Open-Feign）(2)

流控测试

sentinel上下文配置（玩转Sentinel定义异常-整合Open-Feign）(3)

sentinel上下文配置（玩转Sentinel定义异常-整合Open-Feign）(4)

新版Sentinel整合OpenFeign配置实战

加⼊依赖

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

开启Feign对Sentinel的⽀持

#开启Feign对Sentinel的支持 feign: sentinel: enabled: true

创建容错类, 实现对应的服务接⼝, 记得加注解

@Service public class VideoServiceFallback implements VideoService { @Override public Video findById(int videoId) { Video video = new Video(); video.setTitle("系统默认数据！"); return video; } @Override public int save(Video video) { return 0; } }