POI导出Excel

POI是一款很好用的api,下面这个方法是供前台页面调用，供用户选择存储位置的：

    /**
 *
 * <p>
 * Description: excel导出
 * </p>
 *
 * @param request 请求
 * @param response 响应
 * @param fileName 文件名
 * @param columnTitles 列头名
 * @param columnNames 列英文名
 * @param columnFormats 列类型
 * @param sheetName 工作簿
 * @param listData 数据集合
 * @throws IOException 输入异常
 */
@SuppressWarnings({ "deprecation" , "unused" })
public static void export(HttpServletRequest request, HttpServletResponse response, String fileName,
        String[] columnTitles, String[] columnNames, String[] columnFormats, String sheetName,
        List<Map<String, Object>> listData) throws IOException {
    //创建一个新的Excel 
    HSSFWorkbook workBook;
    workBook = new HSSFWorkbook();

    // 生成一个表头样式
    HSSFCellStyle styleTitle;
    styleTitle = workBook.createCellStyle();
    styleTitle.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
    styleTitle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    styleTitle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderRight(HSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderTop(HSSFCellStyle.BORDER_THIN);
    styleTitle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    styleTitle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    styleTitle.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleTitle.setWrapText( true);
    /*
     * HSSFFont font; font = workBook.createFont();
     * font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //字体加粗
     * font.setFontHeight((short) WZDX); // 设置字体大小 font.setFontName("宋体");
     * // 设置单元格字体 styleTitle.setFont(font);
     */

    //创建列的样式
    HSSFCellStyle styleCell;
    styleCell = workBook.createCellStyle();
    styleCell.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    styleCell.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    styleCell.setBorderRight(HSSFCellStyle.BORDER_THIN);
    styleCell.setBorderTop(HSSFCellStyle.BORDER_THIN);
    styleCell.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    styleCell.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    styleCell.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCell.setWrapText( true);
   
    //创建列的样式
    HSSFCellStyle styleCellNumber;
    styleCellNumber = workBook.createCellStyle();
    styleCellNumber.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderRight(HSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderTop(HSSFCellStyle.BORDER_THIN);
    styleCellNumber.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    styleCellNumber.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    styleCellNumber.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCellNumber.setDataFormat(HSSFDataFormat.getBuiltinFormat( "0"));
   
    //创建列的样式
    HSSFCellStyle styleCellDouble;
    styleCellDouble = workBook.createCellStyle();
    styleCellDouble.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderRight(HSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderTop(HSSFCellStyle.BORDER_THIN);
    styleCellDouble.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    styleCellDouble.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    styleCellDouble.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCellDouble.setWrapText( true);
    styleCellDouble.setDataFormat(HSSFDataFormat.getBuiltinFormat( "0.00"));
    //创建sheet页 
    HSSFSheet sheet;
    sheet = workBook.createSheet();
    //每一列的format如果没有被设置，默认全部为string
    String[] columnFormatArr = null;
    if (columnFormats == null) {
        columnFormatArr = new String[columnNames.length ];
        for (int i = 0; i < columnFormatArr.length; i++) {
            columnFormatArr[i] = COLUMN_FORMAT_STRING ;
        }
        //否则按照配置的读取
    } else {
        columnFormatArr = columnFormats;
    }
    //sheet页名称   如果没有进行传送 则为默认的工作簿名称
    if (sheetName != null && sheetName.length() > 0) {
        workBook.setSheetName(0, sheetName);
    } else {
        workBook.setSheetName(0, SHEET_NAME);
    }
    //给表的列头赋值
    HSSFHeader header;
    header = sheet.getHeader();
    HSSFRow row; //第一行
    row = sheet.createRow(0); //设置第一行为Header
    // 设置表格默认列宽度为13个字节
    sheet. setDefaultColumnWidth((short) THIRTEENTH);
    sheet.setDefaultRowHeightInPoints(( short) TWENTY);
    //动态添加列头
    for (int i = 0; i < columnTitles.length; i++) {
        HSSFCell cell = null;
        cell = row. createCell(Short.valueOf(i + ""));
        cell.setCellValue(columnTitles[i]);
        cell.setCellStyle(styleTitle);
    }
    if (null != listData) { //数据为空是 则不用填充数据
        // 填充excel数据
        for (int i = 0; i < listData.size(); i++) {
            final int START_ROW = 1;
            HSSFRow rows;
            rows = sheet.createRow(START_ROW + i);
            for (int j = 0; j < columnNames.length; j++) {
                HSSFCell cells = null;
                cells = rows.createCell(Short.valueOf(j + "" ));
                Object columnObject;
                columnObject = listData.get(i).get(columnNames[j]);
                String columnValue = null;
                if (columnObject == null) {
                    columnValue = "";
                } else if (COLUMN_FORMAT_STRING .equals(columnFormatArr[j].toUpperCase())) {
                    columnValue = columnObject.toString();
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DICT )) {
                    /*
                     * String rootKey; 此处是字典 设置 rootKey =
                     * columnFormatArr[j].substring
                     * (COLUMN_FORMAT_DICT.length()); columnValue =
                     * columnObject.toString(); columnValue =
                     * dictService.findDictValueByDictKey(rootKey,
                     * columnValue);
                     */
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DATE )) {

                    /*
                     * CellStyle cellStyle = workBook.createCellStyle();
                     * DataFormat format= workBook.createDataFormat();
                     * cellStyle
                     * .setDataFormat(format.getFormat("yyyy-MM- dd"));
                     * cell.setCellStyle(cellStyle);
                     */
                    String dateFormat;
                    dateFormat = columnFormatArr[j].substring(COLUMN_FORMAT_DATE .length());
                    SimpleDateFormat sdf;
                    sdf = new SimpleDateFormat(dateFormat);
                    columnValue = sdf.format(columnObject);
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_NUMBER )) {
                    cells.setCellType(Cell.CELL_TYPE_NUMERIC );
                    cells.setCellValue(Integer.parseInt(columnObject.toString()));
                    //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                    cells.setCellStyle(styleCellNumber);
                    continue;
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DOUBLE )) {
                    cells.setCellType(Cell.CELL_TYPE_NUMERIC );
                    cells.setCellValue(Double.parseDouble(columnObject.toString()));
                    //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                    cells.setCellStyle(styleCellDouble);
                    continue;
                }
               
                cells.setCellValue(columnValue);
                //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                cells.setCellStyle(styleCell);
            }
        }
    }
    response.setContentType("application/vnd.ms-excel" );
    //response.setContentType(contentType);
    response.setHeader( CONTENT_DISPOSITION, ATTACHMENT
            + new String((fileName).getBytes(GBK ), "iso8859-1") + ".xls");
    response.setCharacterEncoding( ISO8859);
    OutputStream ouputStream;
    ouputStream = response.getOutputStream();
    workBook.write(ouputStream);
    ouputStream.flush();
    ouputStream.close();
}

对此方法稍作修改，可以改成后台方法生成excel到指定的路径下面：

/**
 *
 * <p>
 * Description: excel导出 供后台任务生成excel 调用
 * </p>
 *
 * @param fileName 文件名
 * @param columnTitles 列头名
 * @param columnNames 列英文名
 * @param columnFormats 列类型
 * @param sheetName 工作簿
 * @param listData 数据集合
 * @throws IOException 输入异常
 */
@SuppressWarnings({ "unused" })
public static void exportToSpecifiedPath(String fileName,
        String[] columnTitles, String[] columnNames, String[] columnFormats, String sheetName,
        List<Map<String, Object>> listData) throws IOException {
    //创建一个新的Excel 
    XSSFWorkbook workBook;
    workBook = new XSSFWorkbook();

    XSSFFont font;
    font = workBook.createFont();
    font.setFontHeightInPoints(( short) TEN );
    // 生成一个表头样式
    XSSFCellStyle styleTitle;
    styleTitle = workBook.createCellStyle();
    styleTitle.setFillForegroundColor( new XSSFColor(new Color(0, BLUE_TWO, BLUE_THREE)));
    styleTitle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
    styleTitle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderRight(XSSFCellStyle.BORDER_THIN);
    styleTitle.setBorderTop(XSSFCellStyle.BORDER_THIN);
    styleTitle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    styleTitle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    styleTitle.setAlignment(XSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleTitle.setWrapText( true);
    /*
     * HSSFFont font; font = workBook.createFont();
     * font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //字体加粗
     * font.setFontHeight((short) WZDX); // 设置字体大小 font.setFontName("宋体");
     * // 设置单元格字体 styleTitle.setFont(font);
     */
    styleTitle.setFont(font);
    //创建列的样式
    XSSFCellStyle styleCell;
    styleCell = workBook.createCellStyle();
    styleCell.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    styleCell.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    styleCell.setBorderRight(XSSFCellStyle.BORDER_THIN);
    styleCell.setBorderTop(XSSFCellStyle.BORDER_THIN);
    styleCell.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    styleCell.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    styleCell.setAlignment(XSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCell.setWrapText( true);
    styleCell.setFont(font);
   
    //创建列的样式
    XSSFCellStyle styleCellNumber;
    styleCellNumber = workBook.createCellStyle();
    styleCellNumber.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderRight(XSSFCellStyle.BORDER_THIN);
    styleCellNumber.setBorderTop(XSSFCellStyle.BORDER_THIN);
    styleCellNumber.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    styleCellNumber.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    styleCellNumber.setAlignment(XSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCellNumber.setDataFormat(workBook.createDataFormat().getFormat("0"));
    styleCellNumber.setFont(font);
   
    //创建列的样式
    XSSFCellStyle styleCellDouble;
    styleCellDouble = workBook.createCellStyle();
    styleCellDouble.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderRight(XSSFCellStyle.BORDER_THIN);
    styleCellDouble.setBorderTop(XSSFCellStyle.BORDER_THIN);
    styleCellDouble.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    styleCellDouble.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    styleCellDouble.setAlignment(XSSFCellStyle.ALIGN_CENTER); //水平布局：居中
    styleCellDouble.setWrapText( true);
    styleCellDouble.setDataFormat(workBook.createDataFormat().getFormat("0.00"));
    styleCellDouble.setFont(font);
   
    //创建sheet页 
    XSSFSheet sheet;
    sheet = workBook.createSheet();
    //每一列的format如果没有被设置，默认全部为string
    String[] columnFormatArr = null;
    if (columnFormats == null) {
        columnFormatArr = new String[columnNames.length ];
        for (int i = 0; i < columnFormatArr.length; i++) {
            columnFormatArr[i] = COLUMN_FORMAT_STRING ;
        }
        //否则按照配置的读取
    } else {
        columnFormatArr = columnFormats;
    }
    //sheet页名称   如果没有进行传送 则为默认的工作簿名称
    if (sheetName != null && sheetName.length() > 0) {
        workBook.setSheetName(0, sheetName);
    } else {
        workBook.setSheetName(0, SHEET_NAME);
    }
    //给表的列头赋值
    Header header;
    header = sheet.getHeader();
    XSSFRow row; //第一行
    row = sheet.createRow(0); //设置第一行为Header
    // 设置表格默认列宽度为13个字节
    sheet.setDefaultColumnWidth(( short) THIRTEENTH);
    sheet.setDefaultRowHeightInPoints(( short) TWENTY);
    //动态添加列头
    for (int i = 0; i < columnTitles.length; i++) {
        XSSFCell cell = null;
        cell = row.createCell(Short. valueOf(i + ""));
        cell.setCellValue(columnTitles[i]);
        cell.setCellStyle(styleTitle);
    }
    if (null != listData) { //数据为空是 则不用填充数据
        // 填充excel数据
        for (int i = 0; i < listData.size(); i++) {
            final int START_ROW = 1;
            XSSFRow rows;
            rows = sheet.createRow(START_ROW + i);
            for (int j = 0; j < columnNames.length; j++) {
                XSSFCell cells = null;
                cells = rows.createCell(Short.valueOf(j + ""));
                Object columnObject;
                columnObject = listData.get(i).get(columnNames[j]);
                String columnValue = null;
                if (columnObject == null) {
                    columnValue = "";
                } else if (COLUMN_FORMAT_STRING .equals(columnFormatArr[j].toUpperCase())) {
                    columnValue = columnObject.toString();
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DICT )) {
                    /*
                     * String rootKey; 此处是字典 设置 rootKey =
                     * columnFormatArr[j].substring
                     * (COLUMN_FORMAT_DICT.length()); columnValue =
                     * columnObject.toString(); columnValue =
                     * dictService.findDictValueByDictKey(rootKey,
                     * columnValue);
                     */
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DATE )) {

                    /*
                     * CellStyle cellStyle = workBook.createCellStyle();
                     * DataFormat format= workBook.createDataFormat();
                     * cellStyle
                     * .setDataFormat(format.getFormat("yyyy-MM- dd"));
                     * cell.setCellStyle(cellStyle);
                     */
                    String dateFormat;
                    dateFormat = columnFormatArr[j].substring(COLUMN_FORMAT_DATE .length());
                    SimpleDateFormat sdf;
                    sdf = new SimpleDateFormat(dateFormat);
                    columnValue = sdf.format(columnObject);
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_NUMBER )) {
                    cells.setCellType(Cell.CELL_TYPE_NUMERIC );
                    cells.setCellValue(Integer.parseInt(columnObject.toString()));
                    //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                    cells.setCellStyle(styleCellNumber);
                    continue;
                } else if (columnFormatArr[j].startsWith(COLUMN_FORMAT_DOUBLE )) {
                    cells.setCellType(Cell.CELL_TYPE_NUMERIC );
                    cells.setCellValue(Double.parseDouble(columnObject.toString()));
                    //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                    cells.setCellStyle(styleCellDouble);
                    continue;
                }
               
                cells.setCellValue(columnValue);
                //sheet.autoSizeColumn((short)columnValue.getBytes().length);
                cells.setCellStyle(styleCell);
            }
        }
    }
    File file;
    file = new File(fileName);
    FileOutputStream ouputStream;
    ouputStream = new FileOutputStream(file);
    workBook.write(ouputStream);
    ouputStream.flush();
    ouputStream.close();
}

后面一个方法生成的是xlsx格式，03版本的工作簿支持的条数较少，如果数量比较大，可以选择导出xlsx格式的,主要就是导入的jar不同。