de.alpharogroup.export.excel.poi.ExportExcelExtensions Maven / Gradle / Ivy
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Project that holds utility class for file operations.
/**
* The MIT License
*
* Copyright (C) 2007 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package de.alpharogroup.export.excel.poi;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
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;
import org.apache.poi.ss.usermodel.Cell;
import de.alpharogroup.lang.ClassExtensions;
/**
* The class ExportExcelExtensions.
*/
public final class ExportExcelExtensions
{
/**
* Exportiert die übergebene excel-Datei in eine Liste mit zweidimensionalen Arrays für jeweils
* ein sheet in der excel-Datei.
*
* @param excelSheet
* Die excel-Datei.
* @return Gibt eine Liste mit zweidimensionalen Arrays für jeweils ein sheet in der excel-Datei
* zurück.
* @throws IOException
* Fals ein Fehler beim Lesen aufgetreten ist.
* @throws FileNotFoundException
* Fals die excel-Datei nicht gefunden wurde.
*/
public static List exportWorkbook(final File excelSheet)
throws IOException, FileNotFoundException
{
final POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(excelSheet));
final HSSFWorkbook wb = new HSSFWorkbook(fs);
final int numberOfSheets = wb.getNumberOfSheets();
final List sheetList = new ArrayList<>();
for (int sheetNumber = 0; sheetNumber < numberOfSheets; sheetNumber++)
{
HSSFSheet sheet = null;
sheet = wb.getSheetAt(sheetNumber);
final int rows = sheet.getLastRowNum();
final int columns = sheet.getRow(0).getLastCellNum();
String[][] excelSheetInTDArray = null;
excelSheetInTDArray = new String[rows + 1][columns];
for (int i = 0; i <= rows; i++)
{
final HSSFRow row = sheet.getRow(i);
if (null != row)
{
for (int j = 0; j < columns; j++)
{
final HSSFCell cell = row.getCell(j);
if (null == cell)
{
excelSheetInTDArray[i][j] = "";
}
else
{
final int cellType = cell.getCellType();
if (cellType == Cell.CELL_TYPE_BLANK)
{
excelSheetInTDArray[i][j] = "";
}
else if (cellType == Cell.CELL_TYPE_BOOLEAN)
{
excelSheetInTDArray[i][j] = Boolean
.toString(cell.getBooleanCellValue());
}
else if (cellType == Cell.CELL_TYPE_ERROR)
{
excelSheetInTDArray[i][j] = "";
}
else if (cellType == Cell.CELL_TYPE_FORMULA)
{
excelSheetInTDArray[i][j] = cell.getCellFormula();
}
else if (cellType == Cell.CELL_TYPE_NUMERIC)
{
excelSheetInTDArray[i][j] = Double
.toString(cell.getNumericCellValue());
}
else if (cellType == Cell.CELL_TYPE_STRING)
{
excelSheetInTDArray[i][j] = cell.getRichStringCellValue()
.getString();
}
}
}
}
}
sheetList.add(excelSheetInTDArray);
}
wb.close();
return sheetList;
}
/**
* Exportiert die übergebene excel-Datei in eine geschachtelte Liste mit Listen von sheets und
* Listen von den Zeilen der sheets von der excel-Datei.
*
* @param excelSheet
* Die excel-Datei.
* @return Gibt eine Liste mit Listen von den sheets in der excel-Datei zurück. Die Listen mit
* den sheets beinhalten weitere Listen mit String die jeweils eine Zeile
* repräsentieren.
* @throws IOException
* Fals ein Fehler beim Lesen aufgetreten ist.
* @throws FileNotFoundException
* Fals die excel-Datei nicht gefunden wurde.
*/
public static List>> exportWorkbookAsStringList(final File excelSheet)
throws IOException, FileNotFoundException
{
final POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(excelSheet));
final HSSFWorkbook wb = new HSSFWorkbook(fs);
final int numberOfSheets = wb.getNumberOfSheets();
final List>> sl = new ArrayList<>();
for (int sheetNumber = 0; sheetNumber < numberOfSheets; sheetNumber++)
{
HSSFSheet sheet = null;
sheet = wb.getSheetAt(sheetNumber);
final int rows = sheet.getLastRowNum();
final int columns = sheet.getRow(0).getLastCellNum();
final List> excelSheetList = new ArrayList<>();
for (int i = 0; i <= rows; i++)
{
final HSSFRow row = sheet.getRow(i);
if (null != row)
{
final List reihe = new ArrayList<>();
for (int j = 0; j < columns; j++)
{
final HSSFCell cell = row.getCell(j);
if (null == cell)
{
reihe.add("");
}
else
{
final int cellType = cell.getCellType();
if (cellType == Cell.CELL_TYPE_BLANK)
{
reihe.add("");
}
else if (cellType == Cell.CELL_TYPE_BOOLEAN)
{
reihe.add(Boolean.toString(cell.getBooleanCellValue()));
}
else if (cellType == Cell.CELL_TYPE_ERROR)
{
reihe.add("");
}
else if (cellType == Cell.CELL_TYPE_FORMULA)
{
reihe.add(cell.getCellFormula());
}
else if (cellType == Cell.CELL_TYPE_NUMERIC)
{
reihe.add(Double.toString(cell.getNumericCellValue()));
}
else if (cellType == Cell.CELL_TYPE_STRING)
{
reihe.add(cell.getRichStringCellValue().getString());
}
}
}
excelSheetList.add(reihe);
}
}
sl.add(excelSheetList);
}
wb.close();
return sl;
}
/**
* The main method.
*
* @param args
* the arguments
* @throws FileNotFoundException
* the file not found exception
* @throws IOException
* Signals that an I/O exception has occurred.
* @throws URISyntaxException
* is thrown if a string could not be parsed as a URI reference.
*/
public static void main(final String[] args)
throws FileNotFoundException, IOException, URISyntaxException
{
final String filename = "test.xls";
final URL url = ClassExtensions.getResource(filename);
final File excelSheet = new File(url.toURI());
System.out.println(excelSheet.exists());
final List sheetList = exportWorkbook(excelSheet);
System.out.println(sheetList);
final List>> excelSheetList = exportWorkbookAsStringList(excelSheet);
System.out.println(excelSheetList);
}
/**
* Replace null cells into empty cells.
*
* @param excelSheet
* the excel sheet
* @return the HSSF workbook
* @throws IOException
* Signals that an I/O exception has occurred.
* @throws FileNotFoundException
* the file not found exception
*/
public static HSSFWorkbook replaceNullCellsIntoEmptyCells(final File excelSheet)
throws IOException, FileNotFoundException
{
final POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(excelSheet));
final HSSFWorkbook wb = new HSSFWorkbook(fs);
final int numberOfSheets = wb.getNumberOfSheets();
for (int sheetNumber = 0; sheetNumber < numberOfSheets; sheetNumber++)
{
HSSFSheet sheet = null;
sheet = wb.getSheetAt(sheetNumber);
final int rows = sheet.getLastRowNum();
final int columns = sheet.getRow(0).getLastCellNum();
for (int i = 0; i <= rows; i++)
{
final HSSFRow row = sheet.getRow(i);
if (null != row)
{
for (int j = 0; j < columns; j++)
{
HSSFCell cell = row.getCell(j);
if (cell == null)
{
cell = row.createCell(j, Cell.CELL_TYPE_BLANK);
}
}
}
}
}
return wb;
}
/**
* Privater Konstruktor damit keine Instanzen erzeugt werden können.
*/
private ExportExcelExtensions()
{
}
}
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