Passing a normal java file value to jsp file
Question
I have written a code to import an excel file where I get data and I want to insert data in my JSP file. Can I do it by using the normal code rather than using servlets? My code for upload the excel file is
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Vector;
import javax.swing.plaf.basic.BasicInternalFrameTitlePane.RestoreAction;
import org.apache.poi.hssf.record.formula.functions.Goto;
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;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
public class uploadexcel {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Please enter a filename with extention to upload");
String fileName = "C:\\"+scanner.nextLine();
Vector dataHolder = ReadCSV(fileName);
printCellDataToConsole(dataHolder);
}
private static void printCellDataToConsole(Vector dataHolder) {
// TODO Auto-generated method stub
for(int i=0;i<dataHolder.size();i++)
{
Vector column=(Vector)dataHolder.elementAt(i);
for (int j = 0; j < column.size(); j++) {
HSSFCell myCell = (HSSFCell) column.elementAt(j);
String stringCellValue = myCell.toString();
System.out.print(stringCellValue + "\t");
}
System.out.println();
}
}
private static Vector ReadCSV(String fileName) {
// TODO Auto-generated method stub
Vector cellVectorHolder = new Vector();
try {
FileInputStream myInput = new FileInputStream(fileName);
POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput);
HSSFWorkbook myWorkBook = new HSSFWorkbook(myFileSystem);
HSSFSheet mySheet = myWorkBook.getSheetAt(0);
Iterator rowIter = mySheet.rowIterator();
while (rowIter.hasNext()) {
HSSFRow myRow = (HSSFRow) rowIter.next();
Iterator cellIter = myRow.cellIterator();
Vector column = new Vector();
while (cellIter.hasNext()) {
HSSFCell myCell = (HSSFCell) cellIter.next();
column.addElement(myCell);
}
cellVectorHolder.addElement(column);
}
} catch(IOException ie)
{
System.err.println("Please enter a valid input");
}
catch (Exception e) {
e.printStackTrace();
}
return cellVectorHolder;
}
}
My jsp file is
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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>NAMES ON THE LIST:</title>
</head>
<body>
names: <input type="text" name="firstname"><br>
</body>
</html>
2 answers
solution1
1 2012-10-11 10:48:19
You do realize that JSP is evaluated on the server and then the HTML result is passed to the browser?
In essence you could have this fragment in your JSP page:
<% printCellDataToConsole( ReadCSV( "file.csv" ) ) %>
which would include your csv in the webpage, modulus markup...
Cheers,
solution2
0 ACCPTED 2012-10-12 07:10:41
I would suggest you not do in this way. Calling Servle t is the proper way to accomplish this.
But, You can do it this way.
<%@page import="java.util.Vector"%>
<%
Vector oRetVal = new Vector();
try{
oRetVal = uploadexcel.ReadCSV("C:\\test.csv"); // Just an example
}catch(Exception e){
e.printStackTrace();
}
%>
Iterate oRetVal in the JSP.
Note : Unrelated to the question: Read on Java Naming Conventions .
It should be "UploadExcel".
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