對於一個程序員來講,文件操做是常常遇到的,尤爲是對Excel文件的操做。java
在這裏介紹一下我在項目中用到的一個操做Excel的工具——POI。關於POI的一些概念,網絡上不少,詳細信息你們能夠自行百度,我在這裏只作簡單介紹。POI是apache的類庫,主要是爲java開發人員提供對Office文件(word、ppt、Excel)處理的支持。我這裏主要給出幾個例子來講明演示一下。程序員
準備工做apache
我用的版本是3.10.1,須要的jar有:網絡
public void testReadExcel() { try { // 讀取Excel Workbook wb = new HSSFWorkbook(new FileInputStream("d:\\2.xls")); // 獲取sheet數目 for (int t = 0; t < wb.getNumberOfSheets(); t++) { Sheet sheet = wb.getSheetAt(t); Row row = null; int lastRowNum = sheet.getLastRowNum(); // 循環讀取 for (int i = 0; i <= lastRowNum; i++) { row = sheet.getRow(i); if (row != null) { // 獲取每一列的值 for (int j = 0; j < row.getLastCellNum(); j++) { Cell cell = row.getCell(j); String value = getCellValue(cell) ; if(!value.equals("")){ System.out.print(value + " | "); } } System.out.println(); } } } } catch (Exception e) { e.printStackTrace(); } }
/*** * 讀取單元格的值 * * @Title: getCellValue * @Date : 2014-9-11 上午10:52:07 * @param cell * @return */ private String getCellValue(Cell cell) { Object result = ""; if (cell != null) { switch (cell.getCellType()) { case Cell.CELL_TYPE_STRING: result = cell.getStringCellValue(); break; case Cell.CELL_TYPE_NUMERIC: result = cell.getNumericCellValue(); break; case Cell.CELL_TYPE_BOOLEAN: result = cell.getBooleanCellValue(); break; case Cell.CELL_TYPE_FORMULA: result = cell.getCellFormula(); break; case Cell.CELL_TYPE_ERROR: result = cell.getErrorCellValue(); break; case Cell.CELL_TYPE_BLANK: break; default: break; } } return result.toString(); }
public void testWriteExcel() { String excelPath = "d:/3.xls"; Workbook workbook = null; try { // XSSFWorkbook used for .xslx (>= 2007), HSSWorkbook for 03 .xsl workbook = new HSSFWorkbook();// XSSFWorkbook();//WorkbookFactory.create(inputStream); } catch (Exception e) { System.out.println("建立Excel失敗: "); e.printStackTrace(); } if (workbook != null) { Sheet sheet = workbook.createSheet("測試數據"); Row row0 = sheet.createRow(0); for (int i = 0; i < 6; i++) { Cell cell = row0.createCell(i, Cell.CELL_TYPE_STRING); cell.setCellValue("列標題" + i ); //sheet.autoSizeColumn(i);//自動調整寬度 } for (int rowNum = 1; rowNum < 10; rowNum++) { Row row = sheet.createRow(rowNum); for (int i = 0; i < 6; i++) { Cell cell = row.createCell(i, Cell.CELL_TYPE_STRING); cell.setCellValue("單元格" + String.valueOf(rowNum + 1) + String.valueOf(i + 1)); } } try { FileOutputStream outputStream = new FileOutputStream(excelPath); workbook.write(outputStream); outputStream.flush(); outputStream.close(); } catch (Exception e) { System.out .println("寫入Excel失敗: "); e.printStackTrace(); } } }效果圖以下:
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