Java POI导入Excel文件

public String importExcel() {
		try{
			InputStream inputStream = new FileInputStream("C:\\Users\\Administrator\\Desktop\\test.xls");
			//根据输入流获取工作簿（整个excel文件）
			Workbook workbook = WorkbookFactory.create(inputStream);
			//获取第一个工作表（excel文件中第一个工作表）
			Sheet sheet = workbook.getSheetAt(0);
			//获取行迭代器
			Iterator<Row> rowIterator = sheet.rowIterator();
			while(rowIterator.hasNext()){
				//获取当前行
				Row row = (Row) rowIterator.next();
				//获取单元格迭代器
				Iterator<Cell> colIterator = row.cellIterator(); 
				while (colIterator.hasNext()){
					//获取当前单元格
					Cell cell = (Cell) colIterator.next();
					//打印列号和行号，从0开始，Excel中A1单元格打印出来是0:0，B2单元格打印出来是1:1
					System.out.print(cell.getRowIndex() + ":" + cell.getColumnIndex() + " ");
					//根据单元格的数据类型获取数据
					switch (cell.getCellType()){
						case Cell.CELL_TYPE_STRING:
							System.out.println(cell.getRichStringCellValue().getString());
							break;
						case Cell.CELL_TYPE_NUMERIC:
							if (DateUtil.isCellDateFormatted(cell)){
								System.out.println(cell.getDateCellValue());
							}else{
								System.out.println(cell.getNumericCellValue());
							}
							break;
						case Cell.CELL_TYPE_BOOLEAN:
							System.out.println(cell.getBooleanCellValue());
							break;
						case Cell.CELL_TYPE_FORMULA:
							System.out.println(cell.getCellFormula());
							break;
						default:
							System.out.println("null");
					}
				}
			}
		} catch (Exception e){
			e.printStackTrace();
		}
		return "";
	}