转（详细的java excel生成）

public static void createWorkbook() throws IOException {
        Workbook wb = new HSSFWorkbook();
        String safeName1 = WorkbookUtil.createSafeSheetName("[O‘sheet1]");
        Sheet sheet1 = wb.createSheet(safeName1);

        CreationHelper createHelper = wb.getCreationHelper();
        // Create a row and put some cells in it. Rows are 0 based.
        Row row = sheet1.createRow((short) 0);

        // Create a cell and put a value in it.
        Cell cell = row.createCell(0);
        cell.setCellValue(1234);

        // Or do it on one line.
        row.createCell(2).setCellValue(
                createHelper.createRichTextString("This is a string"));
        row.createCell(3).setCellValue(true);

        // we style the second cell as a date (and time). It is important to
        // create a new cell style from the workbook otherwise you can end up
        // modifying the built in style and effecting not only this cell but
        // other cells.
        CellStyle cellStyle = wb.createCellStyle();
        cellStyle.setDataFormat(createHelper.createDataFormat().getFormat(
                "m/d/yy h:mm"));
        cell = row.createCell(1);
        cell.setCellValue(new Date());
        cell.setCellStyle(cellStyle);

        // you can also set date as java.util.Calendar
        CellStyle cellStyle1 = wb.createCellStyle();
        cellStyle1.setDataFormat(createHelper.createDataFormat().getFormat(
                "yyyyMMdd HH:mm:ss"));
        cellStyle1.setBorderBottom(CellStyle.BORDER_THIN);
        cellStyle1.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        cellStyle1.setBorderLeft(CellStyle.BORDER_THIN);
        cellStyle1.setLeftBorderColor(IndexedColors.GREEN.getIndex());
        cellStyle1.setBorderRight(CellStyle.BORDER_THIN);
        cellStyle1.setRightBorderColor(IndexedColors.BLUE.getIndex());
        cellStyle1.setBorderTop(CellStyle.BORDER_MEDIUM_DASHED);
        cellStyle1.setTopBorderColor(IndexedColors.BLACK.getIndex());
        cell = row.createCell(4);
        cell.setCellValue(Calendar.getInstance());
        cell.setCellStyle(cellStyle1);

        FileOutputStream fileOut = new FileOutputStream("e:/test/workbook.xls");

        wb.write(fileOut);
        fileOut.close();

    }

public static void readExcel() throws InvalidFormatException, IOException {
        // Use a file
        Workbook wb1 = WorkbookFactory.create(new File("e:/test/userinfo.xls"));



        Sheet sheet = wb1.getSheetAt(0);
        // Decide which rows to process
        // int rowStart = Math.min(10, sheet.getFirstRowNum());
        // int rowEnd = Math.max(40, sheet.getLastRowNum());
        int rowStart = sheet.getLastRowNum();
        int rowEnd = sheet.getLastRowNum() + 1;

        logger.info(sheet.getFirstRowNum());
        logger.info(sheet.getLastRowNum());

        for (int rowNum = rowStart; rowNum < rowEnd; rowNum++) {
            Row r = sheet.getRow(rowNum);
            int lastColumn = Math.max(r.getLastCellNum(), 10);
            logger.info(lastColumn);
            // To get the contents of a cell, you first need to know what kind
            // of cell it is (asking a string cell for its numeric contents will
            // get you a NumberFormatException for example). So, you will want
            // to switch on the cell‘s type, and then call the appropriate
            // getter for that cell.
            for (int cn = 0; cn < lastColumn; cn++) {
                // Cell cell = r.getCell(cn, Row.RETURN_BLANK_AS_NULL);
                Cell cell = r.getCell(cn);

                switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    logger.info(cell.getRichStringCellValue().getString());
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    if (DateUtil.isCellDateFormatted(cell)) {
                        logger.info(cell.getDateCellValue());
                    } else {
                        logger.info(cell.getNumericCellValue());
                    }
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    logger.info(cell.getBooleanCellValue());
                    break;
                case Cell.CELL_TYPE_FORMULA:
                    logger.info(cell.getCellFormula());
                    break;
                default:
                    logger.info("empty");
                }
            }
        }

    }