Cannot get the passing values from jsp to servlet

Question

If I run jsp, while exporting the contents to excel, I am not getting the values in downloaded excel file. It is simply empty. Here what I tried..

How to pass the table values to servlet?

Excel.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
 <%@ page import ="javax.swing.JOptionPane"%>   
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Export to Excel - Demo</title>
</head>
<body>

    <table align="left" border="2">
        <thead>
            <tr bgcolor="lightgreen">
                <th>Sr. No.</th>
                <th>Text Data</th>
                <th>Number Data</th>
            </tr>
        </thead>
        <tbody>
            <%
                for (int i = 0; i < 10; i++) {
            %>
            <tr bgcolor="lightblue">
                <td align="center"><%=i + 1%></td>
                <td align="center">This is text data <%=i%></td>
                <td align="center"><%=i * i%></td>
            </tr>
            <%
                }
            %>
        </tbody>
    </table>

    <a href="Sample?exportToExcel=YES">Export to Excel</a>

</body>
</html>

Sample.java (Servlet)

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class Sample extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public Sample() {
        super();
    }


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    

        String exportToExcel = request.getParameter("exportToExcel");

        if (exportToExcel != null
                && exportToExcel.toString().equalsIgnoreCase("YES")) {
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "inline; filename="
                    + "excel.xls");    
        }  
    }    

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

    }  
}

Answer 1

If you are trying to Export the table ( OR Web page ) to excel file you need to write your download ( response ) code inside the SAME .jsp so in your case.

Add following in your Excel.jsp file.

   <%//Use scriptlet
        if (exportToExcel != null
            && exportToExcel.toString().equalsIgnoreCase("YES")) {
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "inline; filename="
                + "excel.xls");    
    }  
    %>
    //In short COPY whole code from Servlet's get method and paste it in Scriplet

So here you are apparently calling your own .jsp and handling the request and as exportToExcel is equal to YES it will give you the file with content on your .jsp .

Answer 2

Here you are downloading a excel file with out any content .you have to read the values from table and write it in to an excel file . then add the file into the response stream.

the following code may help you.

   public class WriteExcelDemo 
 {
   public static void main(String[] args) 
  {
    //Blank workbook
    XSSFWorkbook workbook = new XSSFWorkbook(); 

    //Create a blank sheet
    XSSFSheet sheet = workbook.createSheet("Employee Data");

    //This data needs to be written (Object[])
    Map<String, Object[]> data = new TreeMap<String, Object[]>();
    data.put("1", new Object[] {"ID", "NAME", "LASTNAME"});
    data.put("2", new Object[] {1, "Amit", "Shukla"});
    data.put("3", new Object[] {2, "Lokesh", "Gupta"});
    data.put("4", new Object[] {3, "John", "Adwards"});
    data.put("5", new Object[] {4, "Brian", "Schultz"});

    //Iterate over data and write to sheet
    Set<String> keyset = data.keySet();
    int rownum = 0;
    for (String key : keyset)
    {
        Row row = sheet.createRow(rownum++);
        Object [] objArr = data.get(key);
        int cellnum = 0;
        for (Object obj : objArr)
        {
           Cell cell = row.createCell(cellnum++);
           if(obj instanceof String)
                cell.setCellValue((String)obj);
            else if(obj instanceof Integer)
                cell.setCellValue((Integer)obj);
        }
    }
    try
    {
        //Write the workbook in file system
        FileOutputStream out = new FileOutputStream(new   File("howtodoinjava_demo.xlsx"));
        workbook.write(out);
        out.close();
        System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
    } 
    catch (Exception e) 
    {
        e.printStackTrace();
    }
    }
    }

Cannot get the passing values from jsp to servlet

Question

2 answers

solution1
1 2014-06-26 09:44:57

solution2
0 2014-06-26 09:54:15

Cannot get the passing values from jsp to servlet

Question

2 answers

solution1 1 2014-06-26 09:44:57

solution2 0 2014-06-26 09:54:15

solution1
1 2014-06-26 09:44:57

solution2
0 2014-06-26 09:54:15