docker安装sentinel，sentinel常用操作

docker run --name sentinel -d -p 8858:8858 -d bladex/sentinel-dashboard:1.8.0

用户名密码都是 sentinel

java -Dserver.port=8858 -jar sentinel-dashboard-1.8.0.jar

 // blockHandler  流量控制
 @RequestMapping("/add")
 @SentinelResource(value = "add",blockHandler = "fallbackAdd")
 public String add(){
     System.out.println("下单成功!");
     return "生成订单";
 }

 public String fallbackAdd(BlockException e){
     return "add流量控了";
 }

@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {

    Logger log= LoggerFactory.getLogger(this.getClass());

    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse response, BlockException e) throws Exception {
        // getRule() 资源  规则的详细信息
        log.info("BlockExceptionHandler BlockException================"+e.getRule());

        Result r = null;

        if (e instanceof FlowException) {
            r = Result.error(100,"接口限流了");

        } else if (e instanceof DegradeException) {
            r = Result.error(101,"服务降级了");

        } else if (e instanceof ParamFlowException) {
            r = Result.error(102,"热点参数限流了");

        } else if (e instanceof SystemBlockException) {
            r = Result.error(103,"触发系统保护规则了");

        } else if (e instanceof AuthorityException) {
            r = Result.error(104,"授权规则不通过");
        }

        //返回json数据
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        new ObjectMapper().writevalue(response.getWriter(), r);
    }
}