1.By Using the JExcelapi

2.By Jakarta’s Poi.jar which uses the HSSFSheet read and write.

–> Using the JExcelapi which  is  not suitable for the important data. It fails to read several files and  in most occasions it also fails to create cells. In short JExcelAPI isn’t suitable for enterprise use.

–>Where as the POI.jar is a Jakarta  Project’s which was developed  by pure Java implementation of the Excel file format. It is a mature product and was able to correctly and effortlessly read excel data generated from various sources, including non-MS Excel products like Open Office, and for various versions of Excel. so for this reasons it is Highly recommended.

Before Using this Code you have to download the poi.jar file  and place it in the lib folder of your application (or) place in the jar folder and give the path in the environment variables in the My Computers, and then import the HSSF files and then follow the code

<%@ page import = “java.io.*” %>
<%@ page import = “java.sql.*” %>
<%@ page import = “javax.servlet.*” %>
<%@ page import = “javax.servlet.http.*” %>
<%@ page import = “java.util.*” %>
<%@ page import = “java.awt.*” %>
<%@ page import = “java.io.File” %>
<%@ page import = “java.io.IOException” %>
<%@ page import = “javax.swing.filechooser.FileSystemView” %>

<%@ page import=”org.apache.poi.hssf.usermodel.HSSFSheet”%>
<%@ page import=”org.apache.poi.hssf.usermodel.HSSFWorkbook”%>
<%@ page import=”org.apache.poi.hssf.usermodel.HSSFRow”%>
<%@ page import=”org.apache.poi.hssf.usermodel.HSSFCell”%>

<%
//Here Datedas is the value of the length which is retrived from the database in my application

String fname1=”File”-”+Datedas+”.xls”;

//Giving name to the file

//creating a file object

File fname=new File(fname1);

//Creating an object to the HSSF Class

HSSFWorkbook hwb = new HSSFWorkbook();

//Giving the name to the Excel file which will be created by this HSSFsheet

HSSFSheet sheet = hwb.createSheet(“stock sheet”);

//Creating the row for your data

HSSFRow pw = sheet.createRow((short)2);

//Mention the Heading of your Excel sheet

pw.createCell((short) 0).setCellValue(“S.No”);
pw.createCell((short) 1).setCellValue(“Heading1″);
pw.createCell((short) 2).setCellValue(“Heading2“);
pw.createCell((short) 3).setCellValue(“Heading3“);
pw.createCell((short) 4).setCellValue(“Heading4“);
pw.createCell((short) 5).setCellValue(“Heading5“);
pw.createCell((short) 6).setCellValue(“Heading6“);
pw.createCell((short) 7).setCellValue(“Heading7“);
pw.createCell((short) 8).setCellValue(“Heading8“);
pw.createCell((short) 9).setCellValue(“Heading9“);
pw.createCell((short) 10).setCellValue(“Heading10“);
pw.createCell((short) 11).setCellValue(“Heading11″);

//String stored1=”",stored2=”",stored3=”",stored4=”",stored5=”",stored6=”",stored7=”",stored9=”";
//float stored8=0.0f,stored10=0.0f,stored12=0.0f;
int comprk=1;

int index=3;
//int compno=0;
int sno=0;
while(rs.next())
{

compno=1;
sno++;

System.out.println(“Testing in the loop  “+compno);

//Creating the Excel Sheet Rows

HSSFRow row = sheet.createRow((short)index);

row.createCell((short) 0).setCellValue(sno);

row.createCell((short)                                                    .setCellValue(Integer.parseInt(rs.getString(1)));
row.createCell((short) 2).setCellValue(rs.getString(2));
row.createCell((short) 3).setCellValue(rs.getString(3));
row.createCell((short) 4).setCellValue(rs.getString(4));
row.createCell((short) 5).setCellValue(rs.getString(5));
row.createCell((short) 6).setCellValue(rs.getString(6));
row.createCell((short) 7).setCellValue(rs.getString(7));
row.createCell((short) 8).setCellValue(rs.getFloat(8));
row.createCell((short) 9).setCellValue(rs.getString(9));
row.createCell((short) 10).setCellValue(rs.getFloat(10));
row.createCell((short) 11).setCellValue(rs.getFloat(13));
index++;
}

FileOutputStream fileOut = new FileOutputStream(fname);

hwb.write(fileOut);
fileOut.flush();
fileOut.close();
out.println(“<b>Your excel file has been Successfully generated</b>”);

%>

Find More file upload examples click here 1 , 2 and 3

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