Question

我正在编写一个执行以下任务的程序。

清理Excel文件（即根据条件删除行）。
将记事本中的数据添加到新的Excel（Say Result Excel）。
将清理过的Excel文件中的数据添加到结果Excel中。

以下是我的代码

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.commons.io.FilenameUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class TextToExcelMultiple {
    static int counter = 1;

    public static void main(String[] args) throws Exception {

        File mainFolder = new File("C:\\D\\Mypath\\New");
        File[] files;
        int rowCount = 0;
        XSSFWorkbook workbook = new XSSFWorkbook();
        XSSFSheet sheet = workbook.createSheet("Result");
        CellStyle style = workbook.createCellStyle();// Create style
        Font font = workbook.createFont();// Create font
        font.setBoldweight(Font.BOLDWEIGHT_BOLD);// Make font bold
        style.setAlignment(CellStyle.ALIGN_CENTER);
        style.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
        style.setFillPattern(CellStyle.SOLID_FOREGROUND);
        style.setFont(font);// set it to bold
        Row row;
        Cell cell;
        row = sheet.createRow(rowCount);
        cell = row.createCell(0);
        cell.setCellValue("NAME");
        cell = row.createCell(1);
        cell.setCellValue("TITLE");
        cell = row.createCell(2);
        cell.setCellValue("FIRM");
        cell = row.createCell(3);
        cell.setCellValue("ADDRESS 1");
        cell = row.createCell(4);
        cell.setCellValue("ADDRESS 2");
        cell = row.createCell(5);
        cell.setCellValue("ADDRESS 3");
        cell = row.createCell(6);
        cell.setCellValue("CITY");
        cell = row.createCell(7);
        cell.setCellValue("STATE");
        cell = row.createCell(8);
        cell.setCellValue("POSTAL CODE");
        cell = row.createCell(9);
        cell.setCellValue("COUNTRY");
        cell = row.createCell(10);
        cell.setCellValue("PHONE");
        cell = row.createCell(11);
        cell.setCellValue("FAX");
        cell = row.createCell(12);
        cell.setCellValue("URL");
        cell = row.createCell(13);
        cell.setCellValue("ISN");
        for (int i = 0; i < row.getLastCellNum(); i++) {
            row.getCell(i).setCellStyle(style);
        }
        rowCount = 1;
        if (mainFolder.isDirectory()) {
            files = mainFolder.listFiles();
            for (File file : files) {
                if (file.isDirectory()) {
                    files = file.listFiles();
                    for (File finalFile : files) {
                        String ext = FilenameUtils.getExtension(finalFile.getAbsolutePath());
                        if ((ext.contains("xls") && finalFile.getName().toLowerCase().contains("detail"))) {
                            cleanUpFile(finalFile);
                        }
                    }
                    for (File finalFile : files) {
                        String ext = FilenameUtils.getExtension(finalFile.getAbsolutePath());
                        if ((ext.equals("txt") && finalFile.getName().contains("brief"))
                                || (ext.contains("xls") && finalFile.getName().toLowerCase().contains("detail"))) {
                            int rowNumber = writeData(finalFile, sheet, rowCount, workbook);
                            rowCount = rowNumber;
                        }
                    }
                }

            }
        }
        FileOutputStream outputStream = new FileOutputStream("C:\\D\\Mihir\\new.xls");
        workbook.write(outputStream);
        outputStream.close();
    }

    private static int writeData(File file, XSSFSheet sheet, int rowCount, XSSFWorkbook workbook) throws Exception {

        FileInputStream fileInputStream = new FileInputStream(file);
        BufferedReader br = new BufferedReader(new InputStreamReader(fileInputStream));
        String x;
        Row row;
        Cell cell;
        String ext = FilenameUtils.getExtension(file.getAbsolutePath() + " \t " + file.getName());
        if (!ext.contains("xls")) {
            while ((x = br.readLine()) != null) {
                if (!(x.contains("NAME"))) {
                    row = sheet.createRow(rowCount);
                    String[] namesList = x.split(",(?=([^\"]*\"[^\"]*\")*[^\"]*$)", -1);
                    int columnCount = 0;
                    for (String name : namesList) {
                        cell = row.createCell(columnCount);
                        cell.setCellValue(name.replace("\"", ""));
                        columnCount += 1;
                    }
                    rowCount += 1;
                }
            }
        }

        if (ext.contains("xls")) {
            int result = appendDataToExcel(file, workbook, rowCount, counter);
            counter = result;
        }

        br.close();
        fileInputStream.close();
        return rowCount;

    }

    private static void cleanUpFile(File file) throws Exception {
        System.out.println(file.getAbsolutePath());
        FileInputStream fin = new FileInputStream(new File(file.getAbsolutePath()));
        Workbook wb = new XSSFWorkbook(fin);
        Sheet sheet = wb.getSheetAt(0);
        Cell cell;
        for (int i = 0; i <= sheet.getLastRowNum(); i++) {
            cell = sheet.getRow(i).getCell(1);
            if (cell == null) {
                sheet.removeRow(sheet.getRow(i));
                int rowIndex = i;
                int lastRowNum = sheet.getLastRowNum();

                if (rowIndex >= 0 && rowIndex <= lastRowNum) {
                    sheet.shiftRows(rowIndex + 1, lastRowNum, -1);
                }
            }
        }
        fin.close();
        FileOutputStream outFile = new FileOutputStream(new File(file.getAbsolutePath()));
        wb.write(outFile);
        wb.close();
        outFile.close();
    }

    private static int appendDataToExcel(File file, XSSFWorkbook workbook, int rowCount, int counter) throws Exception {

        String path = file.getAbsolutePath();
        FileInputStream fin = new FileInputStream(new File(path));
        XSSFWorkbook wb = new XSSFWorkbook(fin);
        XSSFSheet sheet1 = wb.getSheetAt(0);
        int noOfRows = sheet1.getPhysicalNumberOfRows();
        XSSFSheet sheet = workbook.getSheetAt(0);
        Cell cell;
        XSSFRow row;
        for (int i = 1; i < noOfRows; i++) {
            row = sheet.getRow(counter);
            cell = row.getCell(13);
            if (cell == null || cell.getCellType() == Cell.CELL_TYPE_BLANK) {
                cell = row.createCell(13);
            }
            Cell cell1 = sheet1.getRow(i).getCell(1);
            if (cell1 != null && !cell1.equals("")) {
                cell.setCellValue(sheet1.getRow(i).getCell(1).toString() + "\t" + counter);
            }
            counter++;
        }
        wb.close();
        fin.close();
        counter = rowCount;
        return (counter);
    }

}

以前我曾经打电话给cleanUpFile(file)方法，而这用来给我下面的例外

后来我尝试先清理文件，然后在清理过的文件上运行程序但是我仍然得到相同的异常。

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Unknown Source)
    at java.io.ByteArrayOutputStream.grow(Unknown Source)
    at java.io.ByteArrayOutputStream.ensureCapacity(Unknown Source)
    at java.io.ByteArrayOutputStream.write(Unknown Source)
    at org.apache.poi.openxml4j.opc.internal.MemoryPackagePartOutputStream.write(MemoryPackagePartOutputStream.java:88)
    at org.apache.xmlbeans.impl.store.Cursor._save(Cursor.java:590)
    at org.apache.xmlbeans.impl.store.Cursor.save(Cursor.java:2544)
    at org.apache.xmlbeans.impl.values.XmlObjectBase.save(XmlObjectBase.java:223)
    at org.apache.poi.xssf.usermodel.XSSFSheet.write(XSSFSheet.java:2972)
    at org.apache.poi.xssf.usermodel.XSSFSheet.commit(XSSFSheet.java:2927)
    at org.apache.poi.POIXMLDocumentPart.onSave(POIXMLDocumentPart.java:323)
    at org.apache.poi.POIXMLDocumentPart.onSave(POIXMLDocumentPart.java:327)
    at org.apache.poi.POIXMLDocument.write(POIXMLDocument.java:195)
    at TextToExcelMultiple.main(TextToExcelMultiple.java:100)

当我点击at TextToExcelMultiple.main(TextToExcelMultiple.java:100)时，它会指向workbook.write(outputStream);

我的文件很大。

还有一件事当我注释掉下面的块并运行它时，它运行正常，

for (File finalFile : files) {
        String ext = FilenameUtils.getExtension(finalFile.getAbsolutePath());
            if ((ext.equals("txt") && finalFile.getName().contains("brief"))
            || (ext.contains("xls") && finalFile.getName().toLowerCase().contains("detail"))) {
                int rowNumber = writeData(finalFile, sheet, rowCount, workbook);
                    rowCount = rowNumber;
                }
     }

通过其他一些SO帖子，我在我的论点中添加了以下内容。

-Xms1100m -Xmx1100m

当我尝试增加堆内存-Xms1150m -Xmx2048m时，它会给我以下错误。

Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap

因为我的可用内存大约是1150MB。

此外，如果我在客户的系统中将其部署为swing应用程序，那么在执行此操作之前应该注意什么？

请告诉我如何在不面对异常的情况下运行此完整程序。

由于

使用text和excel文件的Java内存堆错误

0 个答案: