java后台利用POI将excle转换成html实现在线预览

  前一阵项目有office系列文件在线预览需求,所以查询了一些资料,参考其他一些博客,实现了通过POI将excle转化为html,后来需求被砍掉,没有继续深入研究,这里将查询到的一些资料做一个记录.

  首先实现office系列文件在线预览主要查到有如下解决方案:

1.flash 的flexpaper 将文档转换为swf格式，然后使用flash在网页中浏览 
2.使用开源的软件openoffice+pdf2htmlEx，利用openoffice的接口先将文档转换为pdf格式，然后在使用pdf2htmlEx将文档转换为html直接在网页中显示， 
3.利用OpenOffice+JodConverter将word2003转换成html或者pdf文件
4.自己搭建一个文档预览服务器，基于office web app,也就是微软的office online，开源的内容管理系统KodExplorer就是这么干的。
5.Java poi将html转化
6.用第三方收费组件：PageOffice

7.虚拟打印机

OpenOffice+JodConverter方式需要搭建 open office服务所以没有采用这种方式,记录相关博客如下:

Java跨平台将word转为pdf结合Jodconverter和OpenOffice

OpenOffice的使用说明

jar包和配置(springboot环境)

Open Office搭建

jodconverter4.1.0版本新特性

Java poi实现excel转化html的方式,来源:原博客,代码亲测可用,支持excel的03版本*.xls和07版本*.xlsx, 生成的html基本保留exlce样式,但不支持条件格式

代码如下:

package com.xxx.service.fileservice.impl;

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.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @author           
 * @date 2018/6/27 11:47
 * @desc
 */
public class ExcelToHTML {

    /**

     * @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

     */
    public static String readExcelToHtml(String filePath ,String htmlPositon, boolean isWithStyle){

        InputStream is = null;
        String htmlExcel = null;
        try {
            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 = ExcelToHTML.getExcelInfo(xWb,isWithStyle);
            }else if(wb instanceof HSSFWorkbook){  //07及10版以后的excel处理方法
                HSSFWorkbook hWb = (HSSFWorkbook) wb;
                htmlExcel = ExcelToHTML.getExcelInfo(hWb,isWithStyle);
            }
            writeFile(htmlExcel,htmlPositon);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return htmlPositon;
    }



    private static String getExcelInfo(Workbook wb,boolean isWithStyle){

        StringBuffer sb = new StringBuffer();
        Sheet sheet = wb.getSheetAt(0);//获取第一个Sheet的内容
        int lastRowNum = sheet.getLastRowNum();
        Map map[] = getRowSpanColSpanMap(sheet);
        sb.append("");
        Row row = null;        //兼容
        Cell cell = null;    //兼容

        for (int rowNum = sheet.getFirstRowNum(); rowNum <= lastRowNum; rowNum++) {
            row = sheet.getRow(rowNum);
            if (row == null) {
                sb.append("");
                continue;
            }
            sb.append("");
            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
                    sb.append("");
                    continue;
                }

                String stringValue = getCellValue(cell);
                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;
                    sb.append("");
            }
            sb.append("");
        }

        sb.append("
 
 
");
                if (stringValue == null || "".equals(stringValue.trim())) {
                    sb.append("   ");
                } 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("
");
        return sb.toString();
    }

    private static Map[] getRowSpanColSpanMap(Sheet sheet) {

        Map map0 = new HashMap();
        Map map1 = new HashMap();
        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;
    }


    /**
     * 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 Cell.CELL_TYPE_NUMERIC:// 数字类型
                if (HSSFDateUtil.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 Cell.CELL_TYPE_STRING:// String类型
                result = cell.getRichStringCellValue().toString();
                break;
            case Cell.CELL_TYPE_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){

        CellStyle cellStyle = cell.getCellStyle();
        if (cellStyle != null) {
            short alignment = cellStyle.getAlignment();
            //    sb.append("align='" + convertAlignToHtml(alignment) + "' ");//单元格内容的水平对齐方式
            short verticalAlignment = cellStyle.getVerticalAlignment();
            sb.append("valign='"+ convertVerticalAlignToHtml(verticalAlignment)+ "' ");//单元格中内容的垂直排列方式

            if (wb instanceof XSSFWorkbook) {

                XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
                short boldWeight = xf.getBoldweight();
                String  align = convertAlignToHtml(alignment);
                sb.append("style='");
                sb.append("font-weight:" + boldWeight + ";"); // 字体加粗
                sb.append("font-size: " + xf.getFontHeight() / 2 + "%;"); // 字体大小
                int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
                sb.append("width:" + columnWidth + "px;");
                sb.append("text-align:" + align + ";");//表头排版样式
                XSSFColor xc = xf.getXSSFColor();
                if (xc != null && !"".equals(xc)) {
                    sb.append("color:#" + xc.getARGBHex().substring(2) + ";"); // 字体颜色
                }

                XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor();
                if (bgColor != null && !"".equals(bgColor)) {
                    sb.append("background-color:#" + bgColor.getARGBHex().substring(2) + ";"); // 背景颜色
                }
                sb.append(getBorderStyle(0,cellStyle.getBorderTop(), ((XSSFCellStyle) cellStyle).getTopBorderXSSFColor()));
                sb.append(getBorderStyle(1,cellStyle.getBorderRight(), ((XSSFCellStyle) cellStyle).getRightBorderXSSFColor()));
                sb.append(getBorderStyle(2,cellStyle.getBorderBottom(), ((XSSFCellStyle) cellStyle).getBottomBorderXSSFColor()));
                sb.append(getBorderStyle(3,cellStyle.getBorderLeft(), ((XSSFCellStyle) cellStyle).getLeftBorderXSSFColor()));

            }else if(wb instanceof HSSFWorkbook){

                HSSFFont hf = ((HSSFCellStyle) cellStyle).getFont(wb);
                short boldWeight = hf.getBoldweight();
                short fontColor = hf.getColor();
                sb.append("style='");
                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);
                sb.append("font-weight:" + boldWeight + ";"); // 字体加粗
                sb.append("font-size: " + hf.getFontHeight() / 2 + "%;"); // 字体大小
                String  align = convertAlignToHtml(alignment);
                sb.append("text-align:" + align + ";");//表头排版样式
                String fontColorStr = convertToStardColor(hc);
                if (fontColorStr != null && !"".equals(fontColorStr.trim())) {
                    sb.append("color:" + fontColorStr + ";"); // 字体颜色
                }
                int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
                sb.append("width:" + columnWidth + "px;");
                short bgColor = cellStyle.getFillForegroundColor();
                hc = palette.getColor(bgColor);
                String bgColorStr = convertToStardColor(hc);
                if (bgColorStr != null && !"".equals(bgColorStr.trim())) {
                    sb.append("background-color:" + bgColorStr + ";"); // 背景颜色
                }
                sb.append( getBorderStyle(palette,0,cellStyle.getBorderTop(),cellStyle.getTopBorderColor()));
                sb.append( getBorderStyle(palette,1,cellStyle.getBorderRight(),cellStyle.getRightBorderColor()));
                sb.append( getBorderStyle(palette,3,cellStyle.getBorderLeft(),cellStyle.getLeftBorderColor()));
                sb.append( getBorderStyle(palette,2,cellStyle.getBorderBottom(),cellStyle.getBottomBorderColor()));
            }

            sb.append("' ");
        }
    }

    /**
     * 单元格内容的水平对齐方式
     * @param alignment
     * @return
     */
    private static String convertAlignToHtml(short alignment) {

        String align = "center";
        switch (alignment) {
            case CellStyle.ALIGN_LEFT:
                align = "left";
                break;
            case CellStyle.ALIGN_CENTER:
                align = "center";
                break;
            case CellStyle.ALIGN_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(short verticalAlignment) {

        String valign = "middle";
        switch (verticalAlignment) {
            case CellStyle.VERTICAL_BOTTOM:
                valign = "bottom";
                break;
            case CellStyle.VERTICAL_CENTER:
                valign = "center";
                break;
            case CellStyle.VERTICAL_TOP:
                valign = "top";
                break;
            default:
                break;
        }
        return valign;
    }

    private static String convertToStardColor(HSSFColor hc) {

        StringBuffer sb = new StringBuffer("");
        if (hc != null) {
            if (HSSFColor.AUTOMATIC.index == 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){
        File file2 = new File(htmlPath);
        StringBuilder sb = new StringBuilder();
        try {
            file2.createNewFile();//创建文件

            sb.append("");
            sb.append("
");
            sb.append(content);
            sb.append("
");
            sb.append("");

            PrintStream printStream = new PrintStream(new FileOutputStream(file2));

            printStream.println(sb.toString());//将字符串写入文件

        } catch (IOException e) {

            e.printStackTrace();
        }

    }
}

需要注意jar包版本

	//apache poi
	compile 'org.apache.poi:poi:3.14'
	compile 'org.apache.poi:ooxml-schemas:1.3'
	compile 'org.apache.poi:poi-ooxml-schemas:3.13'
	compile 'org.apache.poi:poi-ooxml:3.14'
	compile 'org.apache.poi:poi-scratchpad:3.14'
	compile 'org.apache.poi:poi-excelant:3.11'
	compile 'org.apache.poi:poi-examples:3.11'

此外这篇博客  基于poi3.14做的excel(.xlsx)转html的功能 采用将表格样式转化为css代码的方式  经过测试也是可以使用的,但是存在单元格为空会显示?的问题 而且只支持*.xlsx文件

面向搜索引擎编程, 使用ctrl+c/v工具开发只是权宜之计,知其所以然,这里还需深入学习