如何在Java中使用POI在不同的列上写入现有的Excel（* .xlsx）文件？

Question

Dear all member here!!

I got a problem that need to ask your help. I already have an excel file (sample.xlsx). I need to use java code for appending my old data.

Here is my specifications:

1. My old data is in column A, 100 rows for example.
2. Need to write other data (50 rows) in different column, column B for example.
3. Appending data is also start from first row as the old data.

Is it possible to do that in POI?

Answer 1

Here is what you need to do.

XSSFSheet sheet = workbook.getSheet("sample");
for(int i=0; i<numberOfRowsToWriteDataIn; i++) {
   XSSFRow row = sheet.getRow(i);
   row.createCell(5).setCellValue("Creation Date: "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
}

Hope that helps.