使用java apache在excel中添加单元格

Question

我正在阅读已经存在的excel文件并尝试添加某些单元格（例如C4-C15）。我很难通过java操作文件。我正在使用apache poi，并希望得到任何帮助或指导。

Answer 1

要访问Apache POI中的单元格，您必须先获取一行，然后在所选行中获取单元格。以下是示例：

//Input file
InputStream inp = new FileInputStream("workbook.xls");

//Create workbook instance
Workbook wb = WorkbookFactory.create(inp);

//Create sheet instance
Sheet sheet = wb.getSheetAt(0);

for(int i = 3; i <= 16; ++i){ //Rows from 4 to 15 (Apache POI is zero based)
    Row row = sheet.getRow(i);
    Cell cell = row.getCell(2); //Column "C"

    //Do something with cell
}

// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();

Source (more examples here)