testpoi.FlatFilesInFolderToExcel.java Source code

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Here is the source code for testpoi.FlatFilesInFolderToExcel.java

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/*
 * The MIT License
 *
 * Copyright 2014 Admin.
 *
 * 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.
 */

/* Program to recusively read all files in a folder and print their data to cells in an excel file */
package testpoi;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
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;

/**
 *
 * @author Admin
 */
public class FlatFilesInFolderToExcel {

    static File folder = new File("D:\\Folder");
    static File excelFile;
    static XSSFSheet sheet;
    static int rowCount;

    public static void main(String args[]) {
        XSSFWorkbook workbook = new XSSFWorkbook();
        sheet = workbook.createSheet("Read files");
        //Create a new row in current sheet
        Row row = sheet.createRow(0);
        //Create a new cell in current row
        Cell cell = row.createCell(0);
        //Set value to new value
        cell.setCellValue("File Contents");
        rowCount = 1;

        processAllFiles(folder);

        try {
            FileOutputStream out = new FileOutputStream(new File("D:\\new.xlsx"));
            workbook.write(out);
            out.close();
            System.out.println("Excel written successfully..");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void processAllFiles(File folder) {
        for (File file : folder.listFiles()) {
            if (file.isDirectory())
                processAllFiles(file);
            else {
                //this is a file. process it.
                try {
                    BufferedReader br = new BufferedReader(new FileReader(file));
                    String contents = "", line = null;
                    while ((line = br.readLine()) != null) {
                        contents += line;
                    }
                    System.out.println(contents);
                    writeToExcel(contents, sheet);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private static void writeToExcel(String contents, XSSFSheet sheet) {
        //Create a new row in sheet
        Row row = sheet.createRow(rowCount++);
        //Create a new cell in current row
        Cell cell = row.createCell(0);
        //Set value to new value
        cell.setCellValue(contents);
    }

}