JAVA-读取excel转成html 将excel表格转换为HTML文件格式转成前端表格样式

太过爱你忘了你带给我的痛 2024-03-31 14:59 112阅读 0赞

#### 文章目录 ####

*   *  1、调用函数
     *  2、excel转html工具类
     *  3、html样式解析
     *   *   *  3.1 加载图片-URL链接
             *  3.2 设置图片大小
             *  3.3 设置标题-底色&加粗
             *  3.4 圆点样式
             *  3.5 url链接显示为设置内容
             *  3.6 表格 -- 一行三列
             *  3.6 表格 -- 两行三列
             *  3.7 段落
     *  4、时间工具类

博客背景：JAVA项目，将Excel转换为HTML的便捷工具类。可快速上手使用~

### 1、调用函数 ###

excelPositon为存放excel的位置；htmlPositon为将要存放html的位置。  
可以直接设置位置为磁盘中指定位置；如下默认为项目运行的上一级目录

public void excel2Html() {
        
            String excelPositon = "../test.xlsx";
            String htmlPositon =  "../test.html";
            //excel转html；src为excel位置，htmlPositon为存放html文件位置
            Excel2HtmlUtil.readExcelToHtml(excelPositon, htmlPositon, true, "xlsx", "test");
        }

### 2、excel转html工具类 ###

创建相应工具类Excel2HtmlUtil  
改编了一些表头、第一列的样式；还有链接时的样式。如无需可以在对应位置去掉即可~  
调用函数readExcelToHtml()可直接使用转换~

//excel转html工具类
    package com.xx.util;
    
    import org.apache.commons.io.FileUtils;
    import org.apache.poi.hssf.usermodel.*;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.usermodel.*;
    import org.apache.poi.ss.util.CellRangeAddress;
    import org.apache.poi.xssf.usermodel.XSSFCellStyle;
    import org.apache.poi.xssf.usermodel.XSSFColor;
    import org.apache.poi.xssf.usermodel.XSSFFont;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    
    import java.io.*;
    import java.text.DecimalFormat;
    import java.text.SimpleDateFormat;
    import java.util.*;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    
    public class Excel2HtmlUtil {
        
        /**
         *
         * @param filePath    excel源文件文件的路径
         * @param htmlPositon 生成的html文件的路径
         * @param isWithStyle 是否需要表格样式 包含 字体 颜色 边框 对齐方式
         * @throws Exception
         *
         */
        public static String readExcelToHtml(String filePath, String htmlPositon, boolean isWithStyle,String type,String attname) throws Exception {
        
            InputStream is = null;
            String htmlExcel = null;
            Map<String,String> stylemap = new HashMap<String,String>();
            try {
        
                if("csv".equalsIgnoreCase(type)) {
        
                    htmlExcel = getCSVInfo(filePath,htmlPositon);
                    writeFile1(htmlExcel, htmlPositon,stylemap,attname);
                }else {
        
                    File sourcefile = new File(filePath);
                    is = new FileInputStream(sourcefile);
                    Workbook wb = WorkbookFactory.create(is);
                    if (wb instanceof XSSFWorkbook) {
         // 03版excel处理方法
                        XSSFWorkbook xWb = (XSSFWorkbook) wb;
                        htmlExcel = getExcelInfo(xWb, isWithStyle,stylemap);
                    } else if (wb instanceof HSSFWorkbook) {
         // 07及10版以后的excel处理方法
                        HSSFWorkbook hWb = (HSSFWorkbook) wb;
                        htmlExcel = getExcelInfo(hWb, isWithStyle,stylemap);
                    }
                    writeFile(htmlExcel, htmlPositon,stylemap,attname);
                }
            } catch (Exception e) {
        
                System.out.println("文件被损坏或不能打开，无法预览");
                //throw new Exception("文件被损坏或不能打开，无法预览");
            } finally {
        
                try {
        
                    if(is!=null){
        
                        is.close();
                    }
                } catch (IOException e) {
        
                    e.printStackTrace();
                }
            }
            return htmlPositon;
        }
    
        private static void getcscvvalue(BufferedReader reader,List col,String oldvalue,List list) {
        
            String line = null;
            try {
        
                while((line=reader.readLine())!=null){
        
                    String[] item = line.split(",",-1);
                    boolean isbreak = false;
                    for(int i=0;i<item.length;i++) {
        
                        String value = item[i];
                        if(value.endsWith("\"")) {
        
                            value = oldvalue+value;
                            col.add(value);
                        }else if(item.length==1) {
        
                            value = oldvalue+value;
                            getcscvvalue(reader,col,value,list);
                            isbreak = true;
                        }else if(value.startsWith("\"")){
        
                            getcscvvalue(reader,col,value,list);
                            isbreak = true;
                        }else {
        
                            col.add(value);
                        }
                    }
                    if(!isbreak) {
        
                        list.add(col);
                        col = new ArrayList();
                    }
                }
            } catch (IOException e) {
        
            }
        }
    
        private static String getCSVInfo(String filePath,String htmlPositon) {
        
            StringBuffer sb = new StringBuffer();
            DataInputStream in = null;
            try {
        
                in=new DataInputStream(new FileInputStream(filePath));
                BufferedReader reader=new BufferedReader(new InputStreamReader(in));
                //reader.readLine();
                String line = null;
                List list = new ArrayList();
                while((line=reader.readLine())!=null){
        
                    String[] item = line.split(",");
                    List col = new ArrayList();
                    for(int i=0;i<item.length;i++) {
        
                        String value = item[i];
                        if(value.startsWith("\"")) {
        
                            getcscvvalue(reader,col,value,list);
                        }else {
        
                            col.add(value);
                        }
                    }
                    list.add(col);
                }
                sb.append("<table>");
                for(int i=0;i<list.size();i++) {
        
                    List col = (List) list.get(i);
                    if(col==null||col.size()==0) {
        
                        sb.append("<tr><td ></td></tr>");
                    }
                    sb.append("<tr>");
                    for(int j=0;j<col.size();j++) {
        
                        String value = (String) col.get(j);
                        if (value == null||"".equals(value)) {
        
                            sb.append("<td> </td>");
                            continue;
                        }else {
        
                            sb.append("<td>"+value+"</td>");
                        }
                    }
                    sb.append("</tr>");
                }
                sb.append("</table>");
            } catch (IOException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
        
                try {
        
                    in.close();
                } catch (IOException e) {
        
                    e.printStackTrace();
                }
            }
            return sb.toString();
        }
    
        //读取excel文件，返回转换后的html字符串
        private static String getExcelInfo(Workbook wb, boolean isWithStyle, Map<String,String> stylemap) {
        
            StringBuffer sb = new StringBuffer();
            StringBuffer ulsb = new StringBuffer();
            ulsb.append("<ul>");
            int num = wb.getNumberOfSheets();
            //遍历excel文件里的每一个sheet
            for(int i=0;i<num;i++) {
        
                Sheet sheet = wb.getSheetAt(i);// 获取第i个Sheet的内容
                String sheetName = sheet.getSheetName();
                if(i==0) {
        
                    //ulsb.append("<li id='li_"+i+"' class='cur' οnclick='changetab("+i+")'>"+sheetName+"</li>");
                    ulsb.append("<h3 style=\"background-color:LightSkyBlue ;\">" + sheetName + "</h3>");
                }else {
        
                    //sheet名字 加上了蓝色底色
                    //ulsb.append("<li id='li_"+i+"' οnclick='changetab("+i+")'>"+sheetName+"</li>");
                    ulsb.append("<h3 style=\"background-color:LightSkyBlue ;\">" + sheetName + "</h3>");
                }
                int lastRowNum = sheet.getLastRowNum();
                Map<String, String> map[] = getRowSpanColSpanMap(sheet);
                Map<String, String> map1[] = getRowSpanColSpanMap(sheet);
                sb.append("<table id='table_"+i+"' ");
                if(i==0) {
        
                    sb.append("class='block'");
                }
                sb.append(">");
                Row row = null; // 兼容
                Cell cell = null; // 兼容
    
                int maxRowNum = 0;
                int maxColNum = 0;
                //遍历每一行
                for (int rowNum = sheet.getFirstRowNum(); rowNum <= lastRowNum; rowNum++) {
        
                    row = sheet.getRow(rowNum);
                    if (row == null) {
        
                        continue;
                    }
                    int lastColNum = row.getLastCellNum();
                    for (int colNum = 0; colNum < lastColNum; colNum++) {
        
                        cell = row.getCell(colNum);
                        if (cell == null) {
         // 特殊情况 空白的单元格会返回null
                            continue;
                        }
                        String stringValue = getCellValue1(cell);
                        if (map1[0].containsKey(rowNum + "," + colNum)) {
        
                            map1[0].remove(rowNum + "," + colNum);
                            if(maxRowNum<rowNum) {
        
                                maxRowNum = rowNum;
                            }
                            if(maxColNum<colNum) {
        
                                maxColNum = colNum;
                            }
                        } else if (map1[1].containsKey(rowNum + "," + colNum)) {
        
                            map1[1].remove(rowNum + "," + colNum);
                            if(maxRowNum<rowNum) {
        
                                maxRowNum = rowNum;
                            }
                            if(maxColNum<colNum) {
        
                                maxColNum = colNum;
                            }
                            continue;
                        }
                        if (stringValue == null || "".equals(stringValue.trim())) {
        
                            continue;
                        }else {
        
                            if(maxRowNum<rowNum) {
        
                                maxRowNum = rowNum;
                            }
                            if(maxColNum<colNum) {
        
                                maxColNum = colNum;
                            }
                        }
                    }
                }
                for (int rowNum = sheet.getFirstRowNum(); rowNum <= maxRowNum; rowNum++) {
        
                    row = sheet.getRow(rowNum);
                    if (row == null) {
        
                        sb.append("<tr><td ></td></tr>");
                        continue;
                    }
                    sb.append("<tr>");
                    int lastColNum = row.getLastCellNum();
                    for (int colNum = 0; colNum <= maxColNum; colNum++) {
        
                        cell = row.getCell(colNum);
                        if (cell == null) {
         // 特殊情况 空白的单元格会返回null
                            sb.append("<td> </td>");
                            continue;
                        }
                        String stringValue = getCellValue(cell);
                        if (stringValue.equals("")) {
         // 空字符串返空
                            sb.append(stringValue.replace(String.valueOf((char) 160), " "));
                        }
                        String pattrenStr = "[a-zA-z]+://[^\\s]*";
                        Pattern pattern = Pattern.compile(pattrenStr);
                        Matcher matcher = pattern.matcher(stringValue);
                        if (map[0].containsKey(rowNum + "," + colNum)) {
        
                            String pointString = map[0].get(rowNum + "," + colNum);
                            map[0].remove(rowNum + "," + colNum);
                            int bottomeRow = Integer.valueOf(pointString.split(",")[0]);
                            int bottomeCol = Integer.valueOf(pointString.split(",")[1]);
                            int rowSpan = bottomeRow - rowNum + 1;
                            int colSpan = bottomeCol - colNum + 1;
                            if(rowNum == 0){
        
                                sb.append("<td style=\"background-color:WhiteSmoke;font-weight:bold;\",rowspan= '" + rowSpan + "' colspan= '" + colSpan + "' ");
                            }else{
        
                                sb.append("<td rowspan= '" + rowSpan + "' colspan= '" + colSpan + "' ");
                            }
                        } else if (map[1].containsKey(rowNum + "," + colNum)) {
        
                            map[1].remove(rowNum + "," + colNum);
                            continue;
                        } else {
        
                            if(rowNum == 0 || colNum == 0){
        
                                //列表头加粗&底色
                                sb.append("<td style=\"background-color:WhiteSmoke;font-weight:bold;\"");
                            }else{
        
                                sb.append("<td ");
                            }
                        }
                        if (isWithStyle) {
        
                            dealExcelStyle(wb, sheet, cell, sb,stylemap);// 处理单元格样式
                        }
    
    
                        sb.append("><nobr>");
                        //如果单元格为空要判断该单元格是不是通过其他单元格计算得到的
                        if (stringValue == null) {
        
    //                    if (stringValue == null || "".equals(stringValue.trim())) {
        
                            FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
                            if (evaluator.evaluate(cell) != null) {
        
                                //如果单元格的值是通过其他单元格计算来的，则通过单元格计算获取
                                String cellnumber = evaluator.evaluate(cell).getNumberValue() + "";
                                //如果单元格的值是小数，保留两位
                                if (null != cellnumber && cellnumber.contains(".")) {
        
                                    String[] decimal = cellnumber.split("\\.");
                                    if (decimal[1].length() > 2) {
        
                                        int num1 = decimal[1].charAt(0) - '0';
                                        int num2 = decimal[1].charAt(1) - '0';
                                        int num3 = decimal[1].charAt(2) - '0';
                                        if (num3 == 9) {
        
                                            num2 = 0;
                                        } else if (num3 >= 5) {
        
                                            num2 = num2 + 1;
                                        }
                                        cellnumber = decimal[0] + "." + num1 + num2;
                                    }
                                }
                                stringValue = cellnumber;
                            }
                            sb.append(stringValue.replace(String.valueOf((char) 160), " "));
                        } else {
        
                            //如果是链接则使用该语句
                            if(matcher.matches()){
        
                                sb.append("<a href=\""+ stringValue + "\">点击查看内容</a>");
                            }else{
        
                                // 将ascii码为160的空格转换为html下的空格（ ）
                                sb.append(stringValue.replace(String.valueOf((char) 160), " "));
                            }
                        }
                        sb.append("</nobr></td>");
                    }
                    sb.append("</tr>");
                }
                sb.append("</table>");
            }
            ulsb.append("</ul>");
            return ulsb.toString()+sb.toString();
        }
    
    
        private static Map<String, String>[] getRowSpanColSpanMap(Sheet sheet) {
        
            Map<String, String> map0 = new HashMap<String, String>();
            Map<String, String> map1 = new HashMap<String, String>();
            int mergedNum = sheet.getNumMergedRegions();
            CellRangeAddress range = null;
            for (int i = 0; i < mergedNum; i++) {
        
                range = sheet.getMergedRegion(i);
                int topRow = range.getFirstRow();
                int topCol = range.getFirstColumn();
                int bottomRow = range.getLastRow();
                int bottomCol = range.getLastColumn();
                map0.put(topRow + "," + topCol, bottomRow + "," + bottomCol);
                // System.out.println(topRow + "," + topCol + "," + bottomRow + "," +
                // bottomCol);
                int tempRow = topRow;
                while (tempRow <= bottomRow) {
        
                    int tempCol = topCol;
                    while (tempCol <= bottomCol) {
        
                        map1.put(tempRow + "," + tempCol, "");
                        tempCol++;
                    }
                    tempRow++;
                }
                map1.remove(topRow + "," + topCol);
            }
            Map[] map = {
         map0, map1 };
            return map;
        }
    
        private static String getCellValue1(Cell cell) {
        
            String result = new String();
            switch (cell.getCellType()) {
        
                case NUMERIC:// 数字类型
                    result = "1";
                    break;
                case STRING:// String类型
                    result = "1";
                    break;
                case BLANK:
                    result = "";
                    break;
                default:
                    result = "";
                    break;
            }
            return result;
        }
    
        /**
         * 获取表格单元格Cell内容
         *
         * @param cell
         * @return
         */
        private static String getCellValue(Cell cell) {
        
            String result = new String();
            switch (cell.getCellType()) {
        
                case NUMERIC:// 数字类型
                    if (DateUtil.isCellDateFormatted(cell)) {
        // 处理日期格式、时间格式
                        SimpleDateFormat sdf = null;
                        if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) {
        
                            sdf = new SimpleDateFormat("HH:mm");
                        } else {
        // 日期
                            sdf = new SimpleDateFormat("yyyy-MM-dd");
                        }
                        Date date = cell.getDateCellValue();
                        result = sdf.format(date);
                    } else if (cell.getCellStyle().getDataFormat() == 58) {
        
                        // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
                        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                        double value = cell.getNumericCellValue();
                        Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
                        result = sdf.format(date);
                    } else {
        
                        double value = cell.getNumericCellValue();
                        CellStyle style = cell.getCellStyle();
                        DecimalFormat format = new DecimalFormat();
                        String temp = style.getDataFormatString();
                        // 单元格设置成常规
                        if (temp.equals("General")) {
        
                            format.applyPattern("#");
                        }
                        result = format.format(value);
                    }
                    break;
                case STRING:// String类型
                    result = cell.getRichStringCellValue().toString();
                    break;
                case BLANK:
                    result = "";
                    break;
                default:
                    result = "";
                    break;
            }
            return result;
        }
    
        /**
         * 处理表格样式
         *
         * @param wb
         * @param sheet
         * @param sb
         */
        private static void dealExcelStyle(Workbook wb, Sheet sheet, Cell cell, StringBuffer sb,Map<String,String> stylemap) {
        
            CellStyle cellStyle = cell.getCellStyle();
            if (cellStyle != null) {
        
                HorizontalAlignment alignment = cellStyle.getAlignment();
                // sb.append("align='" + convertAlignToHtml(alignment) + "' ");//单元格内容的水平对齐方式
                VerticalAlignment verticalAlignment = cellStyle.getVerticalAlignment();
                String _style = "vertical-align:"+convertVerticalAlignToHtml(verticalAlignment)+";";
                if (wb instanceof XSSFWorkbook) {
        
                    XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
                    //short boldWeight = xf.getBoldweight();
                    short boldWeight = 400;
                    String align = convertAlignToHtml(alignment);
                    int columnWidth = sheet.getColumnWidth(cell.getColumnIndex());
                    _style +="font-weight:" + boldWeight + ";font-size: " + xf.getFontHeight() / 2 + "%;width:" + columnWidth + "px;text-align:" + align + ";";
    
                    XSSFColor xc = xf.getXSSFColor();
                    if (xc != null && !"".equals(xc)) {
        
                        _style +="color:#" + xc.getARGBHex().substring(2) + ";";
                    }
    
                    XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor();
                    if (bgColor != null && !"".equals(bgColor)) {
        
                        _style +="background-color:#" + bgColor.getARGBHex().substring(2) + ";"; // 背景颜色
                    }
                    _style +=getBorderStyle(0, cellStyle.getBorderTop().getCode(),((XSSFCellStyle) cellStyle).getTopBorderXSSFColor());
                    _style +=getBorderStyle(1, cellStyle.getBorderRight().getCode(),((XSSFCellStyle) cellStyle).getRightBorderXSSFColor());
                    _style +=getBorderStyle(2, cellStyle.getBorderBottom().getCode(),((XSSFCellStyle) cellStyle).getBottomBorderXSSFColor());
                    _style +=getBorderStyle(3, cellStyle.getBorderLeft().getCode(),((XSSFCellStyle) cellStyle).getLeftBorderXSSFColor());
                } else if (wb instanceof HSSFWorkbook) {
        
                    HSSFFont hf = ((HSSFCellStyle) cellStyle).getFont(wb);
                    short boldWeight = hf.getFontHeight();
                    short fontColor = hf.getColor();
                    HSSFPalette palette = ((HSSFWorkbook) wb).getCustomPalette(); // 类HSSFPalette用于求的颜色的国际标准形式
                    HSSFColor hc = palette.getColor(fontColor);
                    String align = convertAlignToHtml(alignment);
                    int columnWidth = sheet.getColumnWidth(cell.getColumnIndex());
                    _style +="font-weight:" + boldWeight + ";font-size: " + hf.getFontHeight() / 2 + "%;text-align:" + align + ";width:" + columnWidth + "px;";
                    String fontColorStr = convertToStardColor(hc);
                    if (fontColorStr != null && !"".equals(fontColorStr.trim())) {
        
                        _style +="color:" + fontColorStr + ";"; // 字体颜色
                    }
                    short bgColor = cellStyle.getFillForegroundColor();
                    hc = palette.getColor(bgColor);
                    String bgColorStr = convertToStardColor(hc);
                    if (bgColorStr != null && !"".equals(bgColorStr.trim())) {
        
                        _style +="background-color:" + bgColorStr + ";"; // 背景颜色
                    }
                    _style +=getBorderStyle(palette, 0, cellStyle.getBorderTop().getCode(), cellStyle.getTopBorderColor());
                    _style +=getBorderStyle(palette, 1, cellStyle.getBorderRight().getCode(), cellStyle.getRightBorderColor());
                    _style +=getBorderStyle(palette, 3, cellStyle.getBorderLeft().getCode(), cellStyle.getLeftBorderColor());
                    _style +=getBorderStyle(palette, 2, cellStyle.getBorderBottom().getCode(), cellStyle.getBottomBorderColor());
                }
                String calssname="";
                if(!stylemap.containsKey(_style)) {
        
                    int count = stylemap.size();
                    calssname = "td"+count;
                    stylemap.put(_style, calssname);
                }else {
        
                    calssname = stylemap.get(_style);
                }
                if(!"".equals(calssname)) {
        
                    sb.append("class='"+calssname+"'");
                }
            }
        }
    
        /**
         * 单元格内容的水平对齐方式
         *
         * @param alignment
         * @return
         */
        private static String convertAlignToHtml(HorizontalAlignment alignment) {
        
            String align = "center";
            switch (alignment) {
        
                case LEFT:
                    align = "left";
                    break;
                case CENTER:
                    align = "center";
                    break;
                case RIGHT:
                    align = "right";
                    break;
                default:
                    break;
            }
            return align;
        }
    
        /**
         * 单元格中内容的垂直排列方式
         *
         * @param verticalAlignment
         * @return
         */
        private static String convertVerticalAlignToHtml(VerticalAlignment verticalAlignment) {
        
    
            String valign = "middle";
            switch (verticalAlignment) {
        
                case BOTTOM:
                    valign = "bottom";
                    break;
                case CENTER:
                    valign = "middle";
                    break;
                case TOP:
                    valign = "top";
                    break;
                default:
                    break;
            }
            return valign;
        }
    
        private static String convertToStardColor(HSSFColor hc) {
        
            StringBuffer sb = new StringBuffer("");
            if (hc != null) {
        
                if (HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex() == hc.getIndex()) {
        
                    return null;
                }
                sb.append("#");
                for (int i = 0; i < hc.getTriplet().length; i++) {
        
                    sb.append(fillWithZero(Integer.toHexString(hc.getTriplet()[i])));
                }
            }
            return sb.toString();
        }
    
        private static String fillWithZero(String str) {
        
            if (str != null && str.length() < 2) {
        
                return "0" + str;
            }
            return str;
        }
    
        static String[] bordesr = {
         "border-top:", "border-right:", "border-bottom:", "border-left:" };
        static String[] borderStyles = {
         "solid ", "solid ", "solid ", "solid ", "solid ", "solid ", "solid ", "solid ",
                "solid ", "solid", "solid", "solid", "solid", "solid" };
    
        private static String getBorderStyle(HSSFPalette palette, int b, short s, short t) {
        
            if (s == 0)
                return bordesr[b] + borderStyles[s] + "#d0d7e5 1px;";
            String borderColorStr = convertToStardColor(palette.getColor(t));
            borderColorStr = borderColorStr == null || borderColorStr.length() < 1 ? "#000000" : borderColorStr;
            return bordesr[b] + borderStyles[s] + borderColorStr + " 1px;";
        }
    
        private static String getBorderStyle(int b, short s, XSSFColor xc) {
        
            if (s == 0)
                return bordesr[b] + borderStyles[s] + "#d0d7e5 1px;";
            if (xc != null && !"".equals(xc)) {
        
                String borderColorStr = xc.getARGBHex();// t.getARGBHex();
                borderColorStr = borderColorStr == null || borderColorStr.length() < 1 ? "#000000"
                        : borderColorStr.substring(2);
                return bordesr[b] + borderStyles[s] + borderColorStr + " 1px;";
            }
            return "";
        }
    
        /*
         * @param content 生成的excel表格标签
         *
         * @param htmlPath 生成的html文件地址
         */
        private static void writeFile(String content, String htmlPath, Map<String,String> stylemap,String name) {
        
            File file2 = new File(htmlPath);
            StringBuilder sb = new StringBuilder();
            try {
        
                file2.createNewFile();// 创建文件
                sb.append("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>"+name+"</title><style type=\"text/css\">");
                sb.append("ul{list-style: none;max-width: calc(100%);padding: 0px;margin: 0px;overflow-x: scroll;white-space: nowrap;} ul li{padding: 3px 5px;display: inline-block;border-right: 1px solid #768893;} ul li.cur{color: #F59C25;} table{border-collapse:collapse;display:none;width:100%;} table.block{display: block;}");
                for(Map.Entry<String, String> entry : stylemap.entrySet()){
        
                    String mapKey = entry.getKey();
                    String mapValue = entry.getValue();
                    sb.append(" ."+mapValue+"{"+mapKey+"}");
                }
                sb.append("</style><script>");
                sb.append("function changetab(i){var block = document.getElementsByClassName(\"block\");block[0].className = block[0].className.replace(\"block\",\"\");var cur = document.getElementsByClassName(\"cur\");cur[0].className = cur[0].className.replace(\"cur\",\"\");var curli = document.getElementById(\"li_\"+i);curli.className += ' cur';var curtable = document.getElementById(\"table_\"+i);curtable.className=' block';}");
                sb.append("</script></head><body>");
                sb.append("<div>");
                sb.append(content);
                sb.append("</div>");
                sb.append("</body></html>");
                FileUtils.write(file2, sb.toString(),"UTF-8");
            } catch (IOException e) {
        
                e.printStackTrace();
            }
        }
    
        private static void writeFile1(String content, String htmlPath, Map<String,String> stylemap,String name) {
        
            File file2 = new File(htmlPath);
            StringBuilder sb = new StringBuilder();
            try {
        
                file2.createNewFile();// 创建文件
                sb.append("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>"+name+"</title><style type=\"text/css\">");
                sb.append("ul{list-style: none;max-width: calc(100%);padding: 0px;margin: 0px;overflow-x: scroll;white-space: nowrap;} ul li{padding: 3px 5px;display: inline-block;border-right: 1px solid #768893;} ul li.cur{color: #F59C25;} table{border-collapse:collapse;width:100%;} td{border: solid #000000 1px; min-width: 200px;}");
                sb.append("</style></head><body>");
                sb.append("<div>");
                sb.append(content);
                sb.append("</div>");
                sb.append("</body></html>");
                FileUtils.write(file2, sb.toString(),"UTF-8");
            } catch (IOException e) {
        
                e.printStackTrace();
            }
        }
    
    }

### 3、html样式解析 ###

##### 3.1 加载图片-URL链接 #####

src设置需要加载的图片地址，alt是未加载到链接内容时展示的提示语

##### 3.2 设置图片大小 #####

可以直接按比例设置100%；也可以直接按100px等比例设置

width="图片宽度" height="图片高度"
    width=100%

##### 3.3 设置标题-底色&加粗 #####

hX是标题设置；background-color设置底色；font-weight:bold是加粗

##### 3.4 圆点样式 #####

设置为带圆点样式的语句

##### 3.5 url链接显示为设置内容 #####

不直接展示该链接，显示为“点击查看内容”可点击跳转  
[点击查看内容][Link 1]

##### 3.6 表格 – 一行三列 #####

##### 3.6 表格 – 两行三列 #####

##### 3.7 段落 #####

段落正文中的具体内容

<p>段落段落段落段落段落段落段落</p>

### 4、时间工具类 ###

专供表格使用相关的时间工具类，解决格式转换的问题。

//DateUtil
    public class DateUtil {
        
        public static boolean isCellDateFormatted(Cell cell)
        {
        
            if (cell == null) {
        
                return false;
            }
            boolean bDate = false;
    
            double d = cell.getNumericCellValue();
            if (isValidExcelDate(d)) {
        
                CellStyle style = cell.getCellStyle();
                if (style == null) {
        
                    return false;
                }
                int i = style.getDataFormat();
                String f = style.getDataFormatString();
                bDate = isADateFormat(i, f);
            }
            return bDate;
        }
    
        public static boolean isADateFormat(int formatIndex, String formatString)
        {
        
            if (isInternalDateFormat(formatIndex)) {
        
                return true;
            }
    
            if ((formatString == null) || (formatString.length() == 0)) {
        
                return false;
            }
    
            String fs = formatString;
            //添加以支持汉字格式wingzing
            fs = fs.replaceAll("[\"|\']","").replaceAll("[年|月|日|时|分|秒|毫秒|微秒]", "");
    
            fs = fs.replaceAll("\\\\-", "-");
    
            fs = fs.replaceAll("\\\\,", ",");
    
            fs = fs.replaceAll("\\\\.", ".");
    
            fs = fs.replaceAll("\\\\ ", " ");
    
            fs = fs.replaceAll(";@", "");
    
            fs = fs.replaceAll("^\\[\\$\\-.*?\\]", "");
    
            fs = fs.replaceAll("^\\[[a-zA-Z]+\\]", "");
    
            return (fs.matches("^[yYmMdDhHsS\\-/,. :]+[ampAMP/]*$"));
        }
    
        public static boolean isInternalDateFormat(int format)
        {
        
            switch (format) {
         case 14:
                case 15:
                case 16:
                case 17:
                case 18:
                case 19:
                case 20:
                case 21:
                case 22:
                case 45:
                case 46:
                case 47:
                    return true;
                case 23:
                case 24:
                case 25:
                case 26:
                case 27:
                case 28:
                case 29:
                case 30:
                case 31:
                case 32:
                case 33:
                case 34:
                case 35:
                case 36:
                case 37:
                case 38:
                case 39:
                case 40:
                case 41:
                case 42:
                case 43:
                case 44: } return false;
        }
    
        public static boolean isValidExcelDate(double value)
        {
        
            return (value > -4.940656458412465E-324D);
        }
    }

参考：  
https://www.runoob.com/html/html-colornames.html  
https://www.cnblogs.com/mythz/p/14177739.html  
https://blog.csdn.net/qq\_33697094/article/details/122736603

[Link 1]: https://www.baidu.com