import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
HSSFSheet sheet = workbook.createSheet();
workbook.setSheetName(0, "Sheet名字");
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell(0);
cell = row.createCell(++cellNum);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("单元格内容");