步骤：

1.编写query.jsp代码

<%@ page import="com.mvcapp.entity.Customer" %><%@ page import="java.util.List" %><%--  Created by IntelliJ IDEA.  User: dell  Date: 2019/7/4  Time: 19:34  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>    
     
    
      
               
        
                     
CustomerName:
                     
                
                
                     
CustomerPassword:
                     
                
                
                     
                     
Add New Customer
                
           
      
    
      
    <%        List
      
        customers  = (List
       
        ) request.getAttribute("list");        if (customers!=null&&customers.size()>0){    %>    
        
        <%            for (Customer customer: customers                 ) {        %>        
        <%            }        %>    
                 
          
            
ID
            
NAME
            
PASSWORD
            
DELETE
            
UPDATE
           
          
            
<%=customer.getId()%>
            
<%=customer.getName()%>
            
<%=customer.getPassword()%>
            
DELETE
            
UPDATE
           
         
        
    <%        }    %>    
        
        
        
       
      
     

　

2.delete.do

private void delete(HttpServletRequest req, HttpServletResponse resp) {            String idStr = req.getParameter("id");            int id = 0;            //try...catch的作用：防止idStr不能转为int类型            //若不能转则id=0，无法进行任何的删除操作            try {                id = Integer.parseInt(idStr);                customerDAO.delete(id);            }catch (Exception e){            }        try {            resp.sendRedirect("query.do");        } catch (IOException e) {            e.printStackTrace();        }    }