将来自 servlet 的结果集值添加到 jsp 中的复选框

Question

我在不使用 JSTL 实现的情况下将 servlet 的结果集值添加到 jsp 中的复选框时需要帮助

工作流程：

1.The 用户在文本框中输入一个值并单击搜索按钮

2.On点击搜索调用servlet。 servlet 专注于数据库实现并将结果集值转发到请求来自的同一 jsp 页面。

3.The结果集值应该以复选框的形式显示在jsp

问题：

结果集值正在我的 jsp 页面中打印。我不需要打印所有值，而是需要在我的 jsp 页面中将我的结果集值显示为复选框值。我的结果集大小是 3.

这是我的代码：

Productlist.jsp

<%@page import="java.util.List"%>
<%@page import="web.Products"%>
<%@page import="java.util.ArrayList"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
       <title>Products</title>
</head>

<body>
 <form method="post" align="center" action="ProductList">

Company Name:<input type="text" size="20" id="company" name="company" />
<input type="submit" value="search"/>
  <%
  List<Products> pdts = (List<Products>) request.getAttribute("list");
  if(pdts!=null){
    for(Products prod: pdts){
       out.println("<br/>" + prod.getProductname());
     }
  }
%>

</form>
</body>
</html>

ProductList.java(servlet 代码)

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpSession;


public class ProductList extends HttpServlet {

    static final String dbURL = "jdbc:mysql://localhost:3306/pdt";
    static final String dbUser = "root";
    static final String dbPass = "root";

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8"); 
        PrintWriter out = response.getWriter();
        ResultSet rs = null;
        Connection connection = null;   
        List<Products> pdt = new ArrayList<Products>();

        try{
            String company =request.getParameter("company");
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection (dbURL,dbUser,dbPass);
            String sql="select product_pck from comp_pdt_list where company_name='"+company+"'";
            PreparedStatement prep = connection.prepareStatement(sql); 
            rs=prep.executeQuery();
if(rs!=null)
 {
while(rs.next()) 
  { 
    Products prod=new Products();
      prod.setProductname(rs.getString("product_pck"));
      pdt.add(prod);
}
       request.setAttribute("list",pdt);

            RequestDispatcher rd=request.getRequestDispatcher("Productlist.jsp");    
                    rd.forward(request,response); 
                    return;
 }
prep.close();

       }
     catch(Exception E){
//Any Exceptions will be caught here
System.out.println("The error is"+E.getMessage());

    }  

        finally {
            try {
                connection.close();
            } 
        catch (Exception ex) {
                System.out.println("The error is"+ex.getMessage());
            }
                }

}

}

Answer 1

试试这个：

for(Products prod: pdts){
       out.println("<input type=\"checkbox\" name=\"prod\" value=\"" + prod.getProductname() + "\">" + prod.getProductname() + "<br>");
     }

将来自 servlet 的结果集值添加到 jsp 中的复选框

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