Excel – Upload+ read an excel file in a jsp using POI

apache-commons-fileuploadapache-poiexcelfile uploadfileinputstream

I want to read an excel file in JSP,for this I first uploaded the file in a folder in the 😀 partition named uploads using a web application project,and I tried to read the excel uploaded file with an another java projet.The both codes are working.Here it is the code of uploading in a specific folder via web application project(JSP and SERVLET):

Libraries

  1. commons-fileupload-1.2.2.jar
  2. commons-io-2.1.jar

index.jsp 

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Upload File</title>
</head>
<body>
<form action="UploadFile" method="post" enctype="multipart/form-data">
Select File : <input type="file" name="filetoupload">
<br/>
<input type="submit" value="Upload File">
</form>
</body>
</html>

UploadServlet.java(Servlet)

import java.io.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;

public class UploadFile extends HttpServlet{

String saveFile="D:/upload/"; 

protected void processRequest(...)throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();

try {
boolean ismultipart=ServletFileUpload.isMultipartContent(request);
if(!ismultipart){

}else{
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List items = null;

try{

items = upload.parseRequest(request);
}catch(Exception e){
}
Iterator itr = items.iterator();
while(itr.hasNext()){
FileItem item = (FileItem)itr.next();
if(item.isFormField()){

}else{
String itemname = item.getName();
if((itemname==null || itemname.equals(""))){
continue;
}
String filename = FilenameUtils.getName(itemname);
File f = checkExist(filename);
item.write(f);
}
}
}

}catch(Exception e){

}
finally {
out.close();
}
}

private File checkExist(String fileName) {
File f = new File(saveFile+"/"+fileName);

if(f.exists()){
StringBuffer sb = new StringBuffer(fileName);
sb.insert(sb.lastIndexOf("."),"-"+new Date().getTime());
f = new File(saveFile+"/"+sb.toString());
}
return f;
}

@Override
protected void doGet(...)throws ServletException, IOException {
processRequest(request, response);

}

@Override
protected void doPost(...)throws ServletException, IOException {
processRequest(request, response);
}

@Override
public String getServletInfo() {
return "Short description";
}

}

Then I create a new JAVA PROJECT (SWING) and try the code of reading an EXCEL File via POI,It worked as well,here its is the code:

Libraries

  1. dom4j-1.6.1.jar
  2. poi-3.10-FINAL-20140208.jar
  3. poi-ooxml-3.9-20121203.jar
  4. poi-ooxml-schemas-3.9-20121203.jar
  5. xmlbeans-2.3.0.jar

JavaApplication.java

import java.io.*;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class JavaApplication{
public static void main(String[] args){
try{
FileInputStream file;
file = new FileInputStream(new File("D:\\upload\\total.xlsx"));

//Create Workbook instance holding reference to .xlsx file
XSSFWorkbook workbook = new XSSFWorkbook(file);

//Get first/desired sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);

//Iterate through each rows one by one
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()){
Row row = rowIterator.next();
//For each row, iterate through all the columns
Iterator<Cell> cellIterator = row.cellIterator();

while (cellIterator.hasNext()){
Cell cell = cellIterator.next();

//Check the cell type and format accordingly
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "t");
break;
}
}
System.out.println("");
}
file.close();
} 
catch (Exception e) 
{
e.printStackTrace();
}
}
}

The question is how to mix these two codes to can UPLOAD the file then print the data from EXCEL to a table in JSP ???? help me i'm stuck for over a month on this procedure

Best Answer

after item.write(f); add this

InputStream inputStream= new ByteArrayInputStream(IOUtils.toByteArray(new FileInputStream(f)));

Workbook wb = WorkbookFactory.create(inputStream);
Sheet mySheet = wb.getSheetAt(0);
Iterator<Row> rowIter = mySheet.rowIterator();
rowIter.next();

continue your code from here.

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