sentinel找不到UrlBlockHandler接口解决方法

sentinel找不到UrlBlockHandler接口解决方法

最近在学习springcloud alibaba时候，需要sentinel进行流量管理控制，在统一处理返回异常时候，网上大多数教程都是继承UrlBlockHandler这个方法，但是我在sentinel 1.8版本时候并没有找到这个接口，于是找了附近的源码，发现官方改成了BlockExceptionHandler这个接口与实现。

解决方案： 继承BlockExceptionHandler接口

具体代码如下：

package com.sentinel;

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

import org.springframework.stereotype.Component;

import com.Enum.RequestMsgEnum;
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.fasterxml.jackson.databind.ObjectMapper;
import com.global.BaseController;
 
/**
 * 自定义sentinel异常返回信息
 */
@Component
public class MyUrlBlockHandler extends BaseController implements BlockExceptionHandler{
          
   

	@Override
	public void handle(HttpServletRequest request, HttpServletResponse response, BlockException ex) throws Exception {
          
   
		String msg = null;
        if (ex instanceof FlowException) {
          
   
            msg = "限流了";
        } else if (ex instanceof DegradeException) {
          
   
            msg = "降级了";
        } else if (ex instanceof ParamFlowException) {
          
   
            msg = "热点参数限流";
        } else if (ex instanceof SystemBlockException) {
          
   
            msg = "系统规则（负载/...不满足要求）";
        } else if (ex instanceof AuthorityException) {
          
   
            msg = "授权规则不通过";
        }
        // http状态码
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Type", "application/json;charset=utf-8");
        response.setContentType("application/json;charset=utf-8");
        // spring mvc自带的json操作工具，叫jackson
        new ObjectMapper()
            .writeValue(
                response.getWriter(),
                this.responseResult(RequestMsgEnum.Failtrue, msg)
            );
	}
}

注意：BaseController 此类是我自己写的定义类，自定义格式返回给前端，需要根据自己的需要修改