sentinel整合OpenFeign和nacos

sentinel,熔断,限流等异常,可以通过自己编写异常声明类
nacos:Spring Cloud Alibaba 致力于提供微服务开发的一站式解决方案，Nacos 作为其核心组件之一，可以作为注册中心和配置中心使用；快速实现动态服务发现、服务配置、服务元数据及流量管理。
OpenFeign的@FeignClient可以解析SpringMVC的@RequestMapping注解的接口，通过动态代理的方式实现服务间通信，并内置Ribbon实现客户端负载均衡的能力。
public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws Exception {
String msg = null;
if(e instanceof FlowException){
msg = “接口被限流”;
}else if(e instanceof DegradeException){
msg = “接口被熔断,稍后再试”;
}else if(e instanceof ParamFlowException){
msg = “热点参数限流”;
}else if(e instanceof SystemBlockException){
msg = “系统规则限流”;
}else if(e instanceof AuthorityException){
msg = “系统授权限流”;
}
httpServletResponse.setStatus(500);
httpServletResponse.setCharacterEncoding(“utf-8”);
httpServletResponse.setContentType(“application/json;charset=utf-8”);
ObjectMapper mapper = new ObjectMapper();
Map map = new HashMap<>();
map.put(“code”,500);
map.put(“message”,msg);
mapper.writeValue(httpServletResponse.getWriter(),map);
}
}

yml配置文件的配置,需要配置nacos的地址和sentinel的地址,
配置文件参考如下
spring:
application:
name: feign-service
cloud:
nacos:
discovery:
server-addr: localhost:8848 # 注册中心地址,macos地址
_sentinel:
transport:
dashboard: localhost:8081 #sentinel控制中心地址,默认是8080
server:
port: 8088
feign:
sentinel:
enabled: true #开启OpenFeign基于Sentinel的限流熔断_

`