sentinel统一返回实现BlockExceptionHandler接口，出现流控，没有进来。

代码如下：

package org.wlyg.ewm.gateway.config;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
@Slf4j
public class SentinelExceptionHandler implements BlockExceptionHandler {

@Override
public void handle(HttpServletRequest request, HttpServletResponse response, BlockException ex) throws Exception {

    JSONObject result = new JSONObject();

    result.put("RESULT", "7000");
    String msg = null;
    if (ex instanceof FlowException) {
        msg = "流控规则被触发";
    } else if (ex instanceof DegradeException) {
        msg = "降级规则被触发";
    } else if (ex instanceof ParamFlowException) {
        msg = "热点规则被触发";
    } else if (ex instanceof SystemBlockException) {
        msg = "系统规则被触发";
    } else if (ex instanceof AuthorityException) {
        msg = "授权规则被触发";
    }
    result.put("RESMSG", msg);
    log.error("异常统一返回:{}",result.toJSONString());
    // http状态码
    response.setStatus(200);
    response.setCharacterEncoding("utf-8");
    response.setHeader("Content-Type", "application/json;charset=utf-8");
    response.setContentType("application/json;charset=utf-8");
    response.getWriter().write(result.toJSONString());
}

}