Re: Apache POI, ExcelSheet & Jar...

 Manish Pandit <>
Thu, 12 Jul 2007 16:24:48 -0700
On Jul 12, 3:30 pm, "" <>

Hey guys!

So I have his modified code to create an excel sheet and when I run
it, it does create one, although I have to manually go open the

//import java.awt.List;
import java.lang.Double;
import java.lang.String;
import java.util.*;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class SimpleSpreadsheetTest{
        //SerialDemo serialDemo ;
        //public static String[] serialOutput;
        public static String[] serialOutput = {"1","M","43423",
"2","B","50608", "3","M","53478", "4","B","55853"};
        public static Double myDoubleObject = null;
        public static String myStringObject;

        public static Double getTheString(Double someDouble, String
                return someDouble.valueOf(someString);

        public static double getTheDouble(int i){
                if (serialOutput.length != 0){
                        ArrayList tempList = new ArrayList(Arrays.asList(serialOutput));
                        String myStringObject = (String) tempList.get(i);
                        myDoubleObject = getTheString(myDoubleObject, myStringObject);
                        //return myDoubleObject.doubleValue();
                return myDoubleObject.doubleValue();
        public static void main(String[] args) throws IOException{
                  HSSFWorkbook wb = new HSSFWorkbook();
                  HSSFSheet sheet = wb.createSheet("sheetAttemptOne...Work!");
                  HSSFRow row ;

                  if (serialOutput.length % 3 != 0){
                          System.out.println("Insufficient Data!");
                          row = sheet.createRow(0);
                          HSSFCell hssfCell = row.createCell((short)0);
                          hssfCell.setCellValue("Event Number");
                          hssfCell = row.createCell((short)1);
                          hssfCell.setCellValue("Event Type");
                          hssfCell = row.createCell((short)2);

                                  for (int i=0; i<(serialOutput.length) ; i = i + 3){
                                          row = sheet.createRow(1 + (i/3));

                                          hssfCell = row.createCell((short)0);
                                          hssfCell = row.createCell((short)1);
                                          hssfCell = row.createCell((short)2);
                                  FileOutputStream fileOut = new


/* HSSFCell hssfCell = row.createCell((short)0);
                  hssfCell = row.createCell((short)1);
                  hssfCell = row.createCell((short)2);
                  hssfCell = row.createCell((short)3);

                  row = sheet.createRow(1);

                  hssfCell = row.createCell((short)0);
                  hssfCell = row.createCell((short)1);
                  hssfCell = row.createCell((short)2);
                  hssfCell = row.createCell((short)3);

                    FileOutputStream fileOut = new


So I wanted to make this executable and I have successfully exported
it as a jar file. I am still learning so bear with my question if it's
stupid O:-) but why doesn't the excel sheet get created anymore when I
launch the jar file?



How are you launching the jar file? You should be using java -jar <jar
file name>

Also, when you create the jar file, the manifest needs to call out the
main class (whose main() will be executed).

Here is a link for more details :


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