javaweb中出现问题

跟着b站博主做到了p15遇到的删除后跳转http://localhost:8080/Shop/manage/admin_douserselect?cp=null

用代码块功能插入代码，请勿粘贴截图。 不用代码块回答率下降 50%

   <c:if test="${u.USER_STATUS ==1 }">

<a class="link-del" href="javascript:Delete('你确定要删除用户【${u.USER_NAME}】吗' , '/Shop/manage/admin_douserdel?id=${u.USER_ID}&cpage=${cpage}')">删除a>

c:if>
                      
                            td>
                        tr>
                       c:forEach>
                       <script>
                       
                       function Delete(mess,url){
                          if (confirm(mess)){
                              location.href=url;
                          }
                           
                       }

package com.Shop.servlet.user;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.Shop.entity.SHOP_USER;
import com.Shop.service.SHOP_USERDao;

/**
 * Servlet implementation class DoUserDel
 */
@WebServlet("/manage/admin_douserdel")
public class DoUserDel extends HttpServlet {

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        //设置字符集
                request.setCharacterEncoding("utf-8");
                response.setContentType("text/html;charset=utf-8");
                
                String id=request.getParameter("id");
                
            //加入到数据库的用户表中
                 int count=    SHOP_USERDao.del(id);
                
                
                //成功或失败重定向到哪里
            if(count >0 ){
                response.sendRedirect("admin_douserselect?cp="+request.getParameter("cpape"));
            }else{
                PrintWriter out = response.getWriter();
                out.write("

后端参数拼错了，页面用的cpage，后端取的时候用的是 cpape

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