利用POI生成EXCEL文件的方法实例

{"saveName": "生成Excel的文件名.xlsx","userStyles": [{"id": "1", //不能出现重复，在需要设置单元样式的地方，可以直接将style赋值为此值"style": {"font": { //设置字体基本格式"blod": true,//是否加粗"italic": true, //是否倾斜"color": "#FF0000",//字体颜色"name": "微软雅黑", //字体名称"height": 20 //大小},"fmtStr": "", //单元格格式，#,##0.00_);#,##0.00;0 千分位"align": "",//水平对齐方式 left right center"valign": "",//垂直对齐方式 top center bottom"borderColor": "", //设置边框颜色 如 #FF0000"bgColor": "" //设置单元格填充颜色}}],"sheets": [{"sheetName": "", //sheet名称"title": [], // 对应Sheet标题区域数据"titleMerge": [], //对应Sheet标题区域合并信息"head": [{}], //表头信息"data": [], //数据信息"dataMerge": [], //数据合并信息"foot": [], //表尾信息"footMerge": [], //表尾合并信息"img": [] //图片信息，需要将图片转换base64}]}

{"name": "A|B", //表头名称，多表头用|分割"type": "str", //此列数据类型 str num ,在excel中日期也是数字类型，通过fmtStr,显示为日期格式"field": "F_FIELD1", //备用字段，可不用"style": { //此列数据为列默认样式，可以是Style对象，也可以是在userStyles中定义的id值"align": "center"}}

{"value": "", //单元格具体的值"type": "", //单元格类型，默认str"style": {} //单元格样式 可以是Style对象，也可以是在userStyles中定义的id值，如果没设置，默认取head总此列对应的style}

{"col": 1, //图片开始列"row": 0, //开始行"colSpan": 1,//列跨度，最小值1"rowSpan": 2, //行跨度，最小值1"data": "" //base64图片数据如: "data:image/png;base64,iVBO...ggg=="}

@Overridepublic void buildOutputStream() throws FileProducerException {// 处理传入的JSON数据sheets = this.jsonData.getJSONArray(this.SHEETS);Iterator<Object> sheetIter = sheets.iterator();if (sheets.isEmpty()) {this.responseData.setErrcode(1001);this.responseData.setSuccess(false);this.responseData.setErrmsg("无数据可生成");throw new FileProducerException();}wb = new XSSFWorkbook();// 建立全局格式JSONArray userStyles = this.jsonData.getJSONArray(this.USERSTYLES);this.initUserStyles(userStyles);this.initDefaultHeadStyle(); XSSFSheet ws;JSONObject sheet;JSONArray sheetData;JSONArray sheetTitle;JSONArray sheetHead;JSONArray sheetFoot;JSONArray sheetImgs; String sheetName;int sheetIndex = 0;while (sheetIter.hasNext()) {sheet = (JSONObject) sheetIter.next();// 获取sheet名称sheetName = sheet.getString(this.SHEET_NAME);ws = wb.createSheet();if (StringUtils.isNotBlank(sheetName)) {wb.setSheetName(sheetIndex, sheetName);}int sheetRowIndex = 0;sheetTitle = sheet.getJSONArray(this.SHEET_TITLE);this.setMergeCells(ws, sheet.getJSONArray(this.SHEET_TITLE_MERGE),sheetRowIndex);sheetRowIndex = this.createRandom(ws, sheetTitle, sheetRowIndex); sheetHead = sheet.getJSONArray(this.SHEET_HEAD);sheetRowIndex = this.createHeadColumn(ws, sheetHead, sheetRowIndex); this.setMergeCells(ws, sheet.getJSONArray(this.SHEET_DATA_MERGE),sheetRowIndex);sheetData = sheet.getJSONArray(this.SHEET_DATA);sheetRowIndex = this.createData(ws, sheetData, sheetRowIndex); sheetFoot = sheet.getJSONArray(this.SHEET_FOOT);this.setMergeCells(ws, sheet.getJSONArray(this.SHEET_FOOT_MERGE),sheetRowIndex);sheetRowIndex = this.createRandom(ws, sheetFoot, sheetRowIndex); sheetImgs = sheet.getJSONArray(this.SHEET_IMG); this.setSheetImages(ws, sheetImgs);} // 返回输出流try {ByteArrayOutputStream os = new ByteArrayOutputStream();wb.write(os);this.outStreams.add(os);} catch (IOException e) {throw new FileProducerException(e.getMessage(), e.getCause());}}

private XSSFCellStyle createCellStyle(JSONObject style) { XSSFCellStyle cellStyle = wb.createCellStyle();// 设置字体JSONObject font = style.getJSONObject(this.STYLE_FONT);Font excelFont = this.createFont(font);if (excelFont != null) {cellStyle.setFont(excelFont);}// border统一黑色cellStyle.setBorderBottom(BorderStyle.THIN);cellStyle.setBorderTop(BorderStyle.THIN);cellStyle.setBorderLeft(BorderStyle.THIN);cellStyle.setBorderRight(BorderStyle.THIN); String borderColor = style.getString(this.BORDER_COLOR);if (StringUtils.isNotBlank(borderColor)) {XSSFColor xfBorderColor = new XSSFColor(new Color(Integer.parseInt(borderColor.substring(1), 16)));cellStyle.setBorderColor(BorderSide.BOTTOM, xfBorderColor);cellStyle.setBorderColor(BorderSide.TOP, xfBorderColor);cellStyle.setBorderColor(BorderSide.LEFT, xfBorderColor);cellStyle.setBorderColor(BorderSide.RIGHT, xfBorderColor);}// 背景色String bgColor = style.getString(this.BACKGROUND_COLOR);if (StringUtils.isNotBlank(bgColor)) {XSSFColor cellBgColor = new XSSFColor(new Color(Integer.parseInt(bgColor.substring(1), 16)));cellStyle.setFillForegroundColor(cellBgColor);cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);}// 对齐方式String hAlignment = style.getString(this.HALIGNMENT);if (StringUtils.isNotBlank(hAlignment))cellStyle.setAlignment(HorizontalAlignment.valueOf(hAlignment.toUpperCase()));String vAlignment = style.getString(this.VALIGNMENT);if (StringUtils.isNotBlank(vAlignment))cellStyle.setVerticalAlignment(VerticalAlignment.valueOf(vAlignment.toUpperCase()));// 自动换行TRUEcellStyle.setWrapText(true); // 格式String fmt = style.getString(this.FMTSTRING);if (StringUtils.isNotBlank(fmt))cellStyle.setDataFormat(wb.createDataFormat().getFormat(fmt));return cellStyle;}

private Font createFont(JSONObject fontCfg) {if (fontCfg == null)return null;XSSFFont font = wb.createFont();font.setFontName(fontCfg.getString(this.FONT_NAME));Boolean fontBoole = fontCfg.getBoolean(FONT_BLOD);if (fontBoole != null)font.setBold(fontBoole.booleanValue());fontBoole = fontCfg.getBoolean(this.FONT_ITALIC);if (fontBoole != null)font.setItalic(fontBoole.booleanValue());fontBoole = fontCfg.getBoolean(this.FONT_UNDERLINE);if (fontBoole != null && fontBoole.booleanValue() == true)font.setUnderline(FontUnderline.SINGLE.getByteValue());Short fontHeight = fontCfg.getShort(this.FONT_HEIGHT);if (fontHeight != null)font.setFontHeightInPoints(fontHeight);String colorStr = fontCfg.getString(this.FONT_COLOR);if (colorStr != null) {font.setColor(new XSSFColor(new Color(Integer.parseInt(colorStr.substring(1), 16))));}return font;}

private int createHeadColumn(XSSFSheet ws, JSONArray sheetHead,int sheetRowIndex) {if (sheetHead == null)return sheetRowIndex;Iterator<Object> headIter = sheetHead.iterator();JSONObject curHead = null;int colIndex = 0;Object colStyle = null;int colSize = sheetHead.size();headTypes = new String[colSize];headCellStyleKeys = new String[colSize];int[] headColLevel = new int[colSize];String colName = null;String[] colNameAry = null;int maxLevel = 0;int colLevel = 0;XSSFCell headCell = null;ArrayList<ArrayList<String>> headValueList = new ArrayList<ArrayList<String>>();while (headIter.hasNext()) {curHead = (JSONObject) headIter.next();// 处理默认样式if (curHead.containsKey(this.COLUMN_STYLE)) {colStyle = curHead.get(this.COLUMN_STYLE);if (colStyle instanceof JSONObject) {headCellStyleKeys[colIndex] = this.COLUMNSTYLE_PREV+ colIndex;this.userStyles.put(headCellStyleKeys[colIndex],this.createCellStyle((JSONObject) colStyle));} else if (this.userStyles.containsKey(colStyle)) {headCellStyleKeys[colIndex] = (String) colStyle;}}// 处理默认列宽if (curHead.containsKey(this.COLUMN_WIDTH)) {ws.setDefaultColumnWidth(pixToExcelWdith(curHead.getIntValue(this.COLUMN_WIDTH)));}// 保存列样式if (curHead.containsKey(this.COLUMN_TYPE)) {headTypes[colIndex] = curHead.getString(this.COLUMN_TYPE);} else {headTypes[colIndex] = this.CELLTYPESTRING;}// 处理多表头colName = curHead.getString(this.COLUMN_NAME);colNameAry = colName.split("//|");colLevel = colNameAry.length;headColLevel[colIndex] = colLevel;if (colLevel > maxLevel) {maxLevel = colLevel;}for (int i = 0; i < colLevel; i++) {if (headValueList.size() <= i) {headValueList.add(new ArrayList<String>());}headValueList.get(i).add(colIndex, colNameAry[i]);XSSFRow row = ws.getRow(sheetRowIndex + i);if (row == null) {row = ws.createRow(sheetRowIndex + i);}headCell = row.createCell(colIndex);headCell.setCellValue(colNameAry[i]);headCell.setCellStyle(this.userStyles.get(this.HEADSTYLE_KEY));}colIndex++;} // 横向合并Iterator<ArrayList<String>> a = headValueList.iterator();JSONArray headMerge = new JSONArray();String prev = "";String curent = null;int lRowIndex = 0;int startCol = 0;int mergeCol = 0;ArrayList<String> columnInfo = null;while (a.hasNext()) {startCol = 0;mergeCol = 0;prev = "";columnInfo = a.next();// 第三列才能知道，第一列和第二列是否合并columnInfo.add("");Iterator<String> b = columnInfo.iterator();XSSFCell lastRowCell = null;while (b.hasNext()) {curent = b.next();if (lRowIndex > 0) {lastRowCell = ws.getRow(sheetRowIndex + lRowIndex - 1).getCell(startCol);}if (prev.equalsIgnoreCase(curent) && lRowIndex == 0) {ws.getRow(sheetRowIndex + lRowIndex).getCell(startCol).setCellType(Cell.CELL_TYPE_BLANK);mergeCol++;} else if (prev.equalsIgnoreCase(curent)&& lRowIndex > 0&& StringUtils.isBlank(lastRowCell.getStringCellValue())) {ws.getRow(sheetRowIndex + lRowIndex).getCell(startCol).setCellType(Cell.CELL_TYPE_BLANK);mergeCol++;} else {if (mergeCol > 0 && startCol > 0) {headMerge.add(String.format("%d,%d,%d,%d", lRowIndex,lRowIndex, startCol - mergeCol - 1,startCol - 1));mergeCol = 0;}}startCol++;prev = curent;}lRowIndex++;}for (int i = 0; i < colSize; i++) {if (headColLevel[i] < maxLevel) { // 存在列合并headMerge.add(String.format("%d,%d,%d,%d", headColLevel[i] - 1,maxLevel - 1, i, i));for (int r = headColLevel[i]; r < maxLevel; r++) {ws.getRow(sheetRowIndex + r).createCell(i).setCellStyle(this.userStyles.get(this.HEADSTYLE_KEY));}}} this.setMergeCells(ws, headMerge, sheetRowIndex);return sheetRowIndex + maxLevel;}

private void addImg(XSSFSheet ws, JSONObject img, XSSFCreationHelper cHelper) {String imgBase64 = img.getString(this.SHEET_IMG_DATA);if (StringUtils.isBlank(imgBase64))return;String[] imgary = imgBase64.split(",");System.out.println(imgary[0]);byte[] imgByte = Base64.decodeBase64(imgary[1]);int imgIdx = wb.addPicture(imgByte, Workbook.PICTURE_TYPE_JPEG);XSSFDrawing drawImg = ws.createDrawingPatriarch();XSSFClientAnchor anchor = cHelper.createClientAnchor();int col = img.getIntValue(this.SHEET_IMG_COL);int row = img.getIntValue(this.SHEET_IMG_ROW);anchor.setCol1(col);anchor.setRow1(row);XSSFPicture pict = drawImg.createPicture(anchor, imgIdx);Integer colSpan = img.getInteger(this.SHEET_IMG_COLSPAN);if (colSpan == null)colSpan = 1;Integer rowSpan = img.getInteger(this.SHEET_IMG_ROWSPAN);if (rowSpan == null)rowSpan = 1;pict.resize(colSpan, rowSpan);}