POI 快速开发

 

1.新建工作簿

Workbook wb = new HSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();

Workbook wb = new XSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xlsx");
wb.write(fileOut);
fileOut.close();

2.新的工作表

Workbook wb = new HSSFWorkbook();  // or new XSSFWorkbook();
   Sheet sheet1 = wb.createSheet("new sheet");
   Sheet sheet2 = wb.createSheet("second sheet");


   //注意，表的名称是Excel不得超过31个字符
   //并不能包含任何以下字符：
   //0x0000
   //0x0003
   //冒号（:)
   //反斜杠（\）
   //星号（*）
   //问号（？）
   //正斜线（/）
   //打开方括号（[）
   //右方括号（]）

   //你可以使用org.apache.poi.ss.util.WorkbookUtil#createSafeSheetName(String nameProposal)}
   //一个安全的方式，以建立有效的名称，该实用程序替换无效字符用空格（''）
   String safeName = WorkbookUtil.createSafeSheetName("[O'Brien's sales*?]"); // returns " O'Brien's sales   "
   Sheet sheet3 = wb.createSheet(safeName);

   FileOutputStream fileOut = new FileOutputStream("workbook.xls");
   wb.write(fileOut);
   fileOut.close();

3.创建行、列

Workbook wb = new HSSFWorkbook();
//Workbook wb = new XSSFWorkbook();
CreationHelper createHelper = wb.getCreationHelper();
Sheet sheet = wb.createSheet("new sheet");

// 创建一行，位置为0
Row row = sheet.createRow((short)0);
// 创建一个单元格并赋值
Cell cell = row.createCell(0);
cell.setCellValue(1);

row.createCell(1).setCellValue(1.2);
//设置String的值
row.createCell(2).setCellValue(
     createHelper.createRichTextString("This is a String"));
//设置日期格式
CellStyle cellStyle = wb.createCellStyle();
    cellStyle.setDataFormat(
        createHelper.createDataFormat().getFormat("m/d/yy h:mm"));
    cell = row.createCell(3);
    cell.setCellValue(new Date());
    cell.setCellStyle(cellStyle);
cell = row.createCell(4);
    cell.setCellValue(Calendar.getInstance());
    cell.setCellStyle(cellStyle);
row.createCell(5).setCellValue(new Date());

FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();

4.插入行、插入合并的行

sheet.shiftRows(starRow + 1, sheet.getLastRowNum(), 1, true, false);
for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
    CellRangeAddress range = sheet.getMergedRegion(i);
    if (range.getFirstRow()==starRow&& starRow==range.getLastRow()) {
         //插入合并的行
 sheet.addMergedRegion(new CellRangeAddress(starRow + 1,
                        starRow + 1, range.getFirstColumn(), range
                        .getLastColumn()));
    }
}

5.内容，对齐方式

createCell(wb, row, (short) 0, CellStyle.ALIGN_CENTER, CellStyle.VERTICAL_BOTTOM);
createCell(wb, row, (short) 1, CellStyle.ALIGN_CENTER_SELECTION, CellStyle.VERTICAL_BOTTOM);
createCell(wb, row, (short) 2, CellStyle.ALIGN_FILL, CellStyle.VERTICAL_CENTER);
createCell(wb, row, (short) 3, CellStyle.ALIGN_GENERAL, CellStyle.VERTICAL_CENTER);
createCell(wb, row, (short) 4, CellStyle.ALIGN_JUSTIFY, CellStyle.VERTICAL_JUSTIFY);
createCell(wb, row, (short) 5, CellStyle.ALIGN_LEFT, CellStyle.VERTICAL_TOP);
createCell(wb, row, (short) 6, CellStyle.ALIGN_RIGHT, CellStyle.VERTICAL_TOP);

6.复制、插入行

public void insertRow(int starRow) {
    sheet.shiftRows(starRow + 1, sheet.getLastRowNum(), 1, true, false);
    for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
        Region range = sheet.getMergedRegionAt(i);
        if (range.getRowFrom() == starRow && starRow == range.getRowTo()) {
            sheet.addMergedRegion(new Region(starRow + 1,
                    (short) (starRow + 1), range.getColumnFrom(), range
                            .getColumnTo()));
        }
    }
    HSSFRow fromRow = sheet.getRow(starRow);
    HSSFRow newRow = sheet.getRow(starRow + 1);
    HSSFCell newCell = null;
    HSSFCell fromCell = null;
    for (int i = 0; i < sheet.getRow(starRow).getPhysicalNumberOfCells(); i++) {
        fromCell = fromRow.getCell((short) i);
        if (fromCell == null) {
            continue;
        }
        newCell = newRow.createCell((short) i);
        newCell.setCellStyle(fromCell.getCellStyle());
        int cType = fromCell.getCellType();
        newCell.setCellType(cType);
    }
}

7.复制行（这样可复制一个表）

/**  * 拷贝Excel行 * 从 origSheet的origStartRow行到origEndRow行,复制到newsheet从targetStartNum位置开始 * @param origSheet 原sheet * @param newsheet 目标sheet * @param origStartRow 开始行 * @param origEndRow 结束行 * @param targetStartNum 目标开始行 **/
public void copyRows(HSSFSheet origSheet, HSSFSheet newsheet,
            int origStartRow, int origEndRow, int targetStartNum) {
        if ((origStartRow == -1) || (origEndRow == -1)
                || origEndRow < origStartRow) {
            return;
        }
        // 拷贝合并的单元格
        Region region = null;
        for (int i = 0; i < origSheet.getNumMergedRegions(); i++) {
            region = origSheet.getMergedRegionAt(i);
            if ((region.getRowFrom() >= origStartRow)
                    && (region.getRowTo() <= origEndRow)) {
                region.setRowFrom(region.getRowFrom() + targetStartNum);
                region.setRowTo(region.getRowTo() + targetStartNum);
                newsheet.addMergedRegion(region);
            }
        }

        HSSFRow fromRow = null;
        HSSFRow newRow = null;
        HSSFCell newCell = null;
        HSSFCell fromCell = null;

        // 拷贝行并填充数据
        for (int i = 0; i <= origEndRow; i++) {
            fromRow = origSheet.getRow(i);
            if (fromRow == null) {
                continue;
            }
            newRow = newsheet.createRow(i - origStartRow + targetStartNum);
            newRow.setHeight(fromRow.getHeight());
            for (int j = fromRow.getFirstCellNum(); j < fromRow
                    .getPhysicalNumberOfCells(); j++) {
                fromCell = fromRow.getCell((short) j);
                if (fromCell == null) {
                    continue;
                }
                newCell = newRow.createCell((short) j);
                newCell.setCellStyle(fromCell.getCellStyle());
                int cType = fromCell.getCellType();
                newCell.setCellType(cType);
                switch (cType) {
                case HSSFCell.CELL_TYPE_STRING:
                    newCell.setCellValue(fromCell.getStringCellValue());
                    break;
                case HSSFCell.CELL_TYPE_NUMERIC:
                    newCell.setCellValue(fromCell.getNumericCellValue());
                    break;
                case HSSFCell.CELL_TYPE_FORMULA:
                    newCell.setCellFormula(fromCell.getCellFormula());
                    break;
                case HSSFCell.CELL_TYPE_BOOLEAN:
                    newCell.setCellValue(fromCell.getBooleanCellValue());
                    break;
                case HSSFCell.CELL_TYPE_ERROR:
                    newCell.setCellValue(fromCell.getErrorCellValue());
                    break;
                default:
                    newCell.setCellValue(fromCell.getStringCellValue());
                    break;
                }
            }
        }
    }