Download a page's content into Excel sheet

Question

Hi All,
I generate a JSP Page with contents retrieved by querying the DB. The JSP Page displays say, 10 rows of records. I need to populate these rows of records into an excel sheet and download the excel sheet on click of an Icon or button.
How do I achieve this? Please guide.
Thanks.

Answer 1

POI-HSSF is a Java API to access/create Excel format files. Below is a code snippet to write a table's column names to an excel sheet using this API.
import org.apache.poi.hssf.util.*;
import org.apache.poi.hssf.usermodel.*;
File excelFile = null;
// Open a temporary file to write to
excelFile = File.createTempFile("excel", ".xls");
FileOutputStream fos = new FileOutputStream(excelFile);
BufferedOutputStream bos = new BufferedOutputStream(fos);
// Create a Workbook with one work sheet
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("WorkSheet1");
HSSFCellStyle cs = wb.createCellStyle();
HSSFFont f = wb.createFont();
f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
cs.setFont(f);
Class.forName(" /*driver name goes here.....*/ ");
Connection connection = DriverManager.getConnection(connectionURL );
Statement statement = connection.createStatement();
String query = "select * from table1";
ResultSet resultSet = statement.executeQuery(query);
ResultSetMetaData rsMetaData = resultSet.getMetaData();
int colCount = rsMetaData.getColumnCount();
HSSFRow titleRow = sheet.createRow((short) 0);
HSSFCell titleCell = titleRow.createCell((short) 1);
titleCell.setCellValue("TABLE DATA");
titleCell.setCellStyle(cs);
sheet.addMergedRegion(new Region(0,(short)1,0,(short)2));
HSSFRow headerRow = sheet.createRow(2);
HSSFCell headerCell[] = new HSSFCell[colCount-1];
for( int i=0; i<colCount-1; i++ )
         headerCell[i] = headerRow.createCell((short) i, HSSFCell.CELL_TYPE_STRING);
         headerCell.setCellValue( rsMetaData.getColumnName(i+1) );
headerCell[i].setCellStyle(cs);
Iffat Tahsin