问将Excel数据复制到文本文件- Java (POI)

EN

     name   table   latest_table   Date
1   george  table1  t459           2017-08-24
2   john    table1  thi7           2017-07-23
3   mary    table1  gdr99          2017-07-22

public static void excel_to_text(XSSFWorkbook wb) {
        XSSFSheet sheet = wb.getSheetAt(0);
         int rows = sheet.getPhysicalNumberOfRows();
         int cols = 0, tmp = 0;
         XSSFRow row;
         XSSFCell cell;

         for(int i = 0; i < 10 || i < rows; i++) {
                row = sheet.getRow(i);
                if(row != null) {
                    tmp = sheet.getRow(i).getPhysicalNumberOfCells();
                    if(tmp > cols) cols = tmp;
                }
            }

            for(int r = 0; r < rows; r++) {
                row = sheet.getRow(r);
                if(row != null) {
                    for(int c = 0; c < cols; c++) {
                        cell = row.getCell((short)c);
                        if(cell != null) {
                            *// code here*
                        }
                    }
                }
            }

        }