我的 Excel 工作表中有 100 万条数据记录。客户要求将此文件转换为csv格式。
我尝试了以下一组代码,
File src = new File("C:\\test.xlsx")
File dest = new File("C:\\test.csv")
src.renameTo(dest);
这正在转换文件。但是当我打开文件时出现错误。
另外,我尝试了以下代码,
class XlstoCSV
{
public static void main(String[] args)
{
File inputFile = new File("C:\test.xls");
File outputFile = new File("C:\output.csv");
// For storing data into CSV files
StringBuffer data = new StringBuffer();
try
{
FileOutputStream fos = new FileOutputStream(outputFile);
// Get the workbook object for XLS file
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
// Get first sheet from the workbook
HSSFSheet sheet = workbook.getSheetAt(0);
Cell cell;
Row row;
// Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext())
{
row = rowIterator.next();
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
cell = cellIterator.next();
switch (cell.getCellType())
{
case Cell.CELL_TYPE_BOOLEAN:
data.append(cell.getBooleanCellValue() + ",");
break;
case Cell.CELL_TYPE_NUMERIC:
data.append(cell.getNumericCellValue() + ",");
break;
case Cell.CELL_TYPE_STRING:
data.append(cell.getStringCellValue() + ",");
break;
case Cell.CELL_TYPE_BLANK:
data.append("" + ",");
break;
default:
data.append(cell + ",");
}
data.append('\n');
}
}
fos.write(data.toString().getBytes());
fos.close();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
但是我的代码在此文件中失败了,
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
我在上面的行本身中收到堆内存错误。我不知道如何使用java进行批量数据上传。我什至尝试过 Apache POI jar 代码。但该代码也失败了。
有人可以帮我解决这个问题吗?
最佳答案
使用Apache POI导入 Excel 文件和 MapDB将行缓存在基于磁盘的文件数据库中。
关于java - java导入xlsx批量数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46974355/