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  • 关于POI相关通用方法源码


        private Sheet sheet;
        private Workbook workbook;
        private CreationHelper createHelper;
        private int nowrow = 0;// 当前行
        private int nowcolumn = 0;
        private Row row;
        private List<String> head;
        private CellStyle style = null;// 主要类型,边框

    设置宽度,1个汉字的宽度

        /**
         * 设置宽度,1个汉字的宽度
         * @param array
         */
        public void setWidth(int[] array) {
            for (int i = 0; i < array.length; i++) {
                sheet.setColumnWidth(i, array[i] * 512);
            }
        }

    导入excel用,返回行数

        /**
         * 导入excel用,返回行数
         * @param fileName
         * @
         */
        public int importExcel(String fileName) {
            workbook = this.openFile(fileName);
            sheet = workbook.getSheetAt(0);
            createHelper = workbook.getCreationHelper();
            row = sheet.getRow(0);
            head = this.getRowHead();
            return sheet.getLastRowNum();
        }

    sheetName是sheet,显示名

        /**
         * sheetName是sheet,显示名
         * @param fileName
         * @param sheetName
         * @return
         * @
         */
        public int importExcel(String fileName, String sheetName) {
            workbook = this.openFile(fileName);
            sheet = workbook.getSheet(sheetName);
            createHelper = workbook.getCreationHelper();
            row = sheet.getRow(0);
            head = this.getRowHead();
            return sheet.getLastRowNum();
        }

    导出excel

        /**
         * 导出excel
         * @
         */
        public Row exportExcel(String sheetName) {
            workbook = new HSSFWorkbook();
            sheet = workbook.createSheet(sheetName);
            createHelper = workbook.getCreationHelper();
            row = sheet.createRow(0);
            style = workbook.createCellStyle();
            initBorder(style);
            return row;
        }

    导出excel

        /**
         * 导出excel
         * @
         */
        public Row exportExcel(List<String> sheetNames, Map<String, List<List<String>>> data) {
            workbook = new HSSFWorkbook();
            for (String sheetName : sheetNames) {
                Sheet sheet = workbook.createSheet(sheetName);
                List<List<String>> sheetData = data.get(sheetName);
                int rowNum = 0;
                if (sheetData == null)
                    continue;
                for (List<String> rowData : sheetData) {
                    Row row = sheet.createRow(rowNum);
                    int cellNum = 0;
                    for (String cellData : rowData) {
                        Cell cell = row.createCell(cellNum);
                        cell.setCellValue(cellData);
                        cellNum++;
                    }
                    rowNum++;
                }
            }
            return row;
        }

    获得excel数据

    /**
         * 获得excel数据
         * 传入文件路径及要读取的行数
         * 1、判断文件格式是否正确
         * 2、将数据拼成List<List<String>>类型,并返回
         * @param fileName文件路径+文件名
         * @param rowNum要获取的行数,如果为0则获取全部;如果rowNum大于excel总行数则获取全部
         * @return
         * @
         */
        public List<List<String>> getExcelData(String fileName, int rowNum) {
            int totalNum = this.importExcel(fileName) + 1;// 返回的是最后一行的序列(从0开始),要加1
            if (rowNum == 0 || totalNum < rowNum) {
                rowNum = totalNum;
            }
            List<List<String>> resultList = new ArrayList<List<String>>();
            for (int i = 0; i < rowNum; i++) {
                List<String> list = new ArrayList<String>();
                row = sheet.getRow(i);
                for (int j = 0; j < row.getLastCellNum(); j++) {
                    Cell cell = row.getCell(j);
                    if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC && DateUtil.isCellDateFormatted(cell)) {
                        // 日期格式需要单独处理,否则读出来的可能为yyyy年mm月dd日或其他格式
                        // format为yyyy-MM-dd格式
                        Date date = cell.getDateCellValue();
                        SimpleDateFormat from = new SimpleDateFormat("yyyy-MM-dd");
                        list.add(from.format(date));
                    } else {
                        list.add(cell.toString());
                    }
                }
                resultList.add(list);
            }
            return resultList;
        }
    
        public List<List<String>> listAll() {
            List<List<String>> resultList = new ArrayList<List<String>>();
            for (Row myrow : sheet) {
                List<String> list = new ArrayList<String>();
                for (int i = 0; i < myrow.getLastCellNum() + 1; i++) {
    
                    Cell mycell = myrow.getCell(i);
                    if (mycell == null) {
                        list.add("");
                    } else if (mycell.getCellType() == Cell.CELL_TYPE_NUMERIC && DateUtil.isCellDateFormatted(mycell)) {
                        // 日期格式需要单独处理,否则读出来的可能为yyyy年mm月dd日或其他格式
                        // format为yyyy-MM-dd格式
                        Date date = mycell.getDateCellValue();
                        SimpleDateFormat from = new SimpleDateFormat("yyyy-MM-dd");
                        list.add(from.format(date));
                    } else {
                        list.add(mycell.toString());
                    }
    
                }
                resultList.add(list);
            }
            return resultList;
        }
    
        public List<List<ExcelCellBean>> listCellBean() {
            List<List<ExcelCellBean>> resultList = new ArrayList<List<ExcelCellBean>>();
            int rowNum = sheet.getLastRowNum();
            for (int rowId = 0; rowId <= rowNum; rowId++) {
                Row myrow = sheet.getRow(rowId);
                List<ExcelCellBean> list = new ArrayList<ExcelCellBean>();
                for (int columnId = 0; columnId < myrow.getLastCellNum() + 1; columnId++) {
                    ExcelCellBean ecb = new ExcelCellBean(rowId, columnId);
                    Cell mycell = myrow.getCell(columnId);
                    if (mycell == null) {
                        ecb.setCellValue("");
                        continue;
                    }
    
                    ecb.setWidth(sheet.getColumnWidth(columnId));
                    ecb.setHeight(myrow.getHeight());
                    ecb.setAlign(convertAlignToHtml(mycell.getCellStyle().getAlignment()));
                    ecb.setValign(convertValignToHtml(mycell.getCellStyle().getVerticalAlignment()));
    
                    if (mycell.getCellType() == Cell.CELL_TYPE_NUMERIC && DateUtil.isCellDateFormatted(mycell)) {
                        // 日期格式需要单独处理,否则读出来的可能为yyyy年mm月dd日或其他格式
                        // format为yyyy-MM-dd格式
                        Date date = mycell.getDateCellValue();
                        SimpleDateFormat from = new SimpleDateFormat("yyyy-MM-dd");
                        ecb.setCellValue(from.format(date));
                    } else {
                        ecb.setCellValue(mycell.toString());
                    }
                    list.add(ecb);
                }
                resultList.add(list);
            }
            String delList = new String(";");
            for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
                try {
                    CellRangeAddress region = sheet.getMergedRegion(i);
                    int firstRow = region.getFirstRow();
                    int firstColumn = region.getFirstColumn();
                    int lastRow = region.getLastRow();
                    int lastColumn = region.getLastColumn();
                    resultList.get(firstRow).get(firstColumn).setRightMerged(lastColumn - firstColumn + 1);
                    resultList.get(firstRow).get(firstColumn).setDownMerged(lastRow - firstRow + 1);
                    for (int delRow = lastRow; delRow >= firstRow; delRow--) {
                        for (int delColumn = lastColumn; delColumn >= firstColumn; delColumn--) {
                            if (delList.indexOf(delRow + "," + delColumn + ";") < 0
                                    && ((delRow != firstRow || delColumn != firstColumn))) {
                                delList += delRow + "," + delColumn + ";";
                            }
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
    
                }
            }
            for (int delRow = resultList.size() - 1; delRow >= 0; delRow--) {
                for (int delColumn = resultList.get(delRow).size() - 1; delColumn >= 0; delColumn--) {
                    if (delList.indexOf(";" + delRow + "," + delColumn + ";") >= 0)
                        resultList.get(delRow).remove(delColumn);
                }
            }
            return resultList;
        }

    写输出,最后用

        /**
         * 写输出,最后用
         * @return
         * @
         */
        public InputStream write() {
            ByteArrayOutputStream byteStream = null;
            InputStream result = null;
            try {
                byteStream = new ByteArrayOutputStream();
                try {
                    workbook.write(byteStream);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                result = new ByteArrayInputStream(byteStream.toByteArray());
                return result;
            } finally {
    
            }
        }

    重新单元格指定位置

        /**
         * 重新单元格指定位置
         * @param nowrow
         * @param nowcolumn
         */
        public void setPosition(int nowrow, int nowcolumn) {
            this.nowcolumn = nowcolumn;
            this.nowrow = nowrow;
        }

    移到下一行,列开头(读取)

        /**
         * 移到下一行,列开头(读取)
         */
        public Row nextRow() {
            row = sheet.getRow(++nowrow);
            this.nowcolumn = 0;
            return row;
        }

    移到下i行,列开头(读取)

        /**
         * 移到下i行,列开头(读取)
         */
        public Row nextRow(int i) {
            nowrow = nowrow + i;
            row = sheet.getRow(nowrow);
            this.nowcolumn = 0;
            return row;
        }

    创建一新行(写入用)

        /**
         * 
         * 创建一新行(写入用)
         * @return
         */
        public Row createRow() {
            row = sheet.createRow(++nowrow);
            this.nowcolumn = 0;
            return row;
        }

    跳一个单元格

        /**
         * 跳一个单元格
         */
        public void skipCell() {
            this.nowcolumn = nowcolumn + 1;
        }

    时间类型与文本不能同时存在

        /**
         * 时间类型与文本不能同时存在 
         * @return 时间类型的style(yyyy-MM-dd)
         * @
         */
        public short getDateStyle() {
            return createHelper.createDataFormat().getFormat("yyyy-MM-dd");
    
        }

    设置输出文本格式,与日期不能同时存在

        /**
         * 设置输出文本格式,与日期不能同时存在
         * @return
         * @ 
         */
        public short getTextStyle() {
            return createHelper.createDataFormat().getFormat("@");
        }

    添加数字的字符文本

    /**
         * 添加数字的字符文本
         * @param value
         * @ 
         */
        public Cell addValue(String value) {
            CellStyle mystyle = workbook.createCellStyle();
            mystyle.cloneStyleFrom(style);// 主要类型
            mystyle.setDataFormat(createHelper.createDataFormat().getFormat("@"));
            Cell cell = this.addValue(value, mystyle);
            return cell;
        }

    添加指定类型的,非日期

    /**
         * 添加指定类型的,非日期
         * @param value
         * @ 
         */
        public Cell addValue(Object value, CellStyle style) {
    
            Cell cell = row.createCell(nowcolumn++);
            cell.setCellStyle(style);
            if (value instanceof String) {
                cell.setCellValue((String) value);
            }
            if (value instanceof Double) {
                cell.setCellValue((Double) value);
            }
            if (value instanceof Date) {
                if (value != null)
                    cell.setCellValue((Date) value);
            }
            return cell;
        }

    在指定的位置建造下拉,–>下拉名(Id)

    /**
         * 在指定的位置建造下拉,-->下拉名(Id)
         * @param x 行
         * @param lx 最后行
         * @param y 列
         * @param ly 最后列
         * @param dropLs 要添加的下拉,下拉有数量限制,上百个的下拉只能用名称空间
         * @
         */
        public void addDrop(List<DropBean> dropLs) {
            addDropNoMove(dropLs);
            this.addValue("");// 初值
        }
    
        public void addDropNoMove(List<DropBean> dropLs) {
            addDropAllColumn(dropLs, nowrow, nowrow, nowrow);
        }
    
        public void addDropAllColumn(List<DropBean> dropLs, int startrow, int endrow, int columnnum) {
            CellRangeAddressList conDrop = new CellRangeAddressList(startrow, endrow, columnnum, columnnum);
            String[] strArr = new String[dropLs.size()];
            for (int j = 0; j < dropLs.size(); j++) {
                strArr[j] = dropLs.get(j).getLabel() + "(" + dropLs.get(j).getValue() + ")";
            }
            DVConstraint dvConstraint = DVConstraint.createExplicitListConstraint(strArr);
            DataValidation dataValidation = new HSSFDataValidation(conDrop, dvConstraint);
            dataValidation.setSuppressDropDownArrow(false);
            sheet.addValidationData(dataValidation);
        }

    Workbook读取excel工厂,可以判断扩展名选择2007或者2003的excelapi

    /**
         * Workbook读取excel工厂,可以判断扩展名选择2007或者2003的excelapi
         * 
         * @param file
         * @return Sheet
         * @
         */
        public Workbook openFile(String fileName) {
            InputStream inp = null;
            try {
                File file = new File(fileName);
                if (!file.exists() || !file.isFile()) {
                    throw new BaseConfirmException("文件不存在!");
                }
                // 判断扩展名是否正确 -- xlsx或者xls的
                if (!"xls".equalsIgnoreCase(GjCommonUtil.getExtName(file.getName()))
                        && !"xlsx".equalsIgnoreCase(GjCommonUtil.getExtName(file.getName()))) {
                    throw new BaseConfirmException("文件格式不正确,请重新选择Excel文件!");
                }
                try {
                    inp = new FileInputStream(file);
                    return WorkbookFactory.create(inp);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } finally {
                if (inp != null) {
                    try {
                        inp.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return null;
        }

    获取第一行所有字符串集合.表头验证

    /**
         * 获取第一行所有字符串集合.表头验证
         * @param headRow
         * @return
         * @
         */
        public List<String> getRowHead() {
            Row headRow = sheet.getRow(0);
            if (headRow == null) {
                return null;
            }
            Iterator<Cell> cellIter = headRow.cellIterator();
            List<String> hiddenhead = new ArrayList<String>();// 获取第一列的所有字符
            while (cellIter.hasNext()) {
                hiddenhead.add(cellIter.next().toString());
            }
            return hiddenhead;
        }

    当前行列的位置

    /**
         * 当前行列的位置
         * 读取的单元格本身必须是文本类型的数字或者是字符
         * @param index
         * @return
         * @
         */
        public Long getLong(String strindex) {
            int numIndex = head.indexOf(strindex);
            String strLong = row.getCell(numIndex).toString();
            if (strLong == null || "".equals(strLong.trim())) {
                return null;
            }
            return Long.valueOf(strLong);
        }
    
        public Timestamp getDate(String strindex) {
            int numIndex = head.indexOf(strindex);
            Cell mycell = row.getCell(numIndex);
            Date utilDate = null;
            if (mycell.getCellType() == Cell.CELL_TYPE_NUMERIC && DateUtil.isCellDateFormatted(mycell)) {
                // 日期格式需要单独处理,否则读不出来yyyy年mm月dd日或其他格式
                // format为yyyy-MM-dd格式
                utilDate = row.getCell(numIndex).getDateCellValue();
                if (utilDate == null) {
                    return null;
                }
            } else {
                try {
                    String datestr = row.getCell(numIndex).getStringCellValue();
                    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
                    utilDate = dateFormat.parse(datestr);
                } catch (Exception e) {
                    return null;
                }
            }
            return new java.sql.Timestamp(utilDate.getTime());
        }
    
        public String getStr(String strindex) {
            int numIndex = head.indexOf(strindex);
            return getStrByNumIndex(numIndex);
    
        }
    
        public String getStrByNumIndex(int numIndex) {
            String result = null;
            if (row != null) {
                Cell cell = row.getCell(numIndex);
                if (cell == null) {
                    return "";
                }
                // 如果是公式,那么需要处理,公式结算结果必须为数字,否则抛出异常
                if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
                    result = cell.getNumericCellValue() + "";
                } else if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {// 单元格是字符
                    result = row.getCell(numIndex) == null ? null : row.getCell(numIndex).getStringCellValue();
                } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {// 单元格是数字
                    result = row.getCell(numIndex) == null ? null : row.getCell(numIndex).getNumericCellValue() + "";
                    if (result.indexOf(".0") == result.length() - 2) {
                        result = result.substring(0, result.length() - 2);
                    }
                } else {
                    result = row.getCell(numIndex) == null ? null : row.getCell(numIndex).toString();
                }
            }
            return result;
        }

    获取当前行指定列日期值

    /**
         * 获取当前行指定列日期值
         * @param strindex
         * @return
         * @throws Exception
         */
        public Timestamp getDate(int numIndex) throws Exception {
            Cell mycell = row.getCell(numIndex);
            Date utilDate = null;
            if (mycell.getCellType() == Cell.CELL_TYPE_NUMERIC && DateUtil.isCellDateFormatted(mycell)) {
                // 日期格式需要单独处理,否则读不出来yyyy年mm月dd日或其他格式
                // format为yyyy-MM-dd格式
                utilDate = row.getCell(numIndex).getDateCellValue();
                if (utilDate == null) {
                    return null;
                }
            } else {
                try {
                    String datestr = row.getCell(numIndex).getStringCellValue();
                    if (datestr.length() == 7 && datestr.indexOf("-") > 0)
                        datestr = datestr + "-01";
                    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
                    utilDate = dateFormat.parse(datestr);
                } catch (Exception e) {
                    return null;
                }
            }
            return new java.sql.Timestamp(utilDate.getTime());
        }

    读取指定单元格数据

    /**
         * 读取指定单元格数据
         * @param curRow 当前行对象
         * @param dataRow  需要读取的行对象
         * @param numIndex 需要读取的列
         * @return
         */
        public String getStrByRow(int curRow, int dataRow, int numIndex) {
            row = sheet.getRow(dataRow);
            String result = this.getStrByNumIndex(numIndex);
            row = sheet.getRow(curRow);// 重新指定当前行为读取行
            return result;
        }
    
        // 获取标题头中的一个名字下对应多个列
        public List<String> getStrLs(String strindex) {
            List<String> result = new ArrayList<String>();
            for (int i = 0; i < head.size(); i++) {
                if (strindex.equals(head.get(i))) {
                    result.add(getStrByNumIndex(i));
                }
            }
            return result;
        }

    自动调整显示宽度

    /**
         * 自动调整显示宽度
         * @param row
         * @param sheet
         * @
         */
        public void autoSize() {
            if (sheet == null || sheet.getRow(0) == null || sheet.getRow(0).getLastCellNum() == 0) {
                return;
            }
            for (int i = 0; i < sheet.getRow(0).getLastCellNum(); i++) {
                sheet.autoSizeColumn(i);
            }
        }
    
        public void setFrozen(int rowNum) {
            sheet.createFreezePane(0, rowNum, 0, rowNum);
        }

    设置head–虽然可以在加载excel的时候获取到head,但是有的没有head设置,要单独设置head

    /**
         * 设置head--虽然可以在加载excel的时候获取到head,但是有的没有head设置,要单独设置head
         */
        public void setHead(List<String> head) {
            this.head = head;
        }
    
        private String convertAlignToHtml(short alignment) {
            String align = "left";
            switch (alignment) {
            case HSSFCellStyle.ALIGN_LEFT:
                align = "left";
                break;
            case HSSFCellStyle.ALIGN_CENTER:
                align = "center";
                break;
            case HSSFCellStyle.ALIGN_RIGHT:
                align = "right";
                break;
            default:
                break;
            }
            return align;
        }
    
        private String convertValignToHtml(short valignment) {
            String align = "left";
            switch (valignment) {
            case HSSFCellStyle.VERTICAL_TOP:
                align = "top";
                break;
            case HSSFCellStyle.VERTICAL_CENTER:
                align = "middle";
                break;
            case HSSFCellStyle.VERTICAL_BOTTOM:
                align = "bootom";
                break;
            default:
                break;
            }
            return align;
        }
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  • 原文地址:https://www.cnblogs.com/aixing/p/13327574.html
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