导出excel 转html 预览

程序员文章站 2022-07-13 15:59:00
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借鉴某大神的代码结合自己做的项目，实现java导出excel在线预览，发现使用SXSSFWORKBOOR的很少，所以贴出来供同行们参考，不用生成html文件在读取，原文已找不到，希望能帮到需要的人
1.页面
<body>
<div id="jsonstr">
${jsonStr}
</div>
</body>
2.java 后台
ExportExcel jsonStr= exportExcel.ExcelToHtmlTo();

ExportExcel.java
public String ExcelToHtmlTo(){
		StringBuilder sb = new StringBuilder();
		if(wb instanceof SXSSFWorkbook){  //07及10版以后的excel处理方法
			SXSSFWorkbook hWb = (SXSSFWorkbook) wb;
			String htmlExcel = ExcelToHtml.getExcelInfo(hWb,true);
			sb.append(htmlExcel);
		}
		return sb.toString();
	}



ExcelToHtml.java

package com.datacenter.jeefp.common.utils.excel;

import java.io.*;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import com.datacenter.jeefp.common.utils.CheckUtil;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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.streaming.SXSSFWorkbook;
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;

/**
 * Excel转html
 *
 */
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 SXSSFWorkbook){  //07及10版以后的excel处理方法
                SXSSFWorkbook hWb = (SXSSFWorkbook) wb;
                htmlExcel = ExcelToHtml.getExcelInfo(hWb,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);
            }else if (wb instanceof XSSFWorkbook) {   //03版excel处理方法
                XSSFWorkbook xWb = (XSSFWorkbook) wb;
                htmlExcel = ExcelToHtml.getExcelInfo(xWb,isWithStyle);
            }
            writeFile(htmlExcel,htmlPositon);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return htmlPositon;
    }



    public 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<String, String> map[] = getRowSpanColSpanMap(sheet);
        sb.append("<table border='1' style='border-collapse:collapse;' width='100%'>");
        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("<tr><td ></td></tr>");
                continue;
            }
            sb.append("<tr>");
            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("<td> </td>");
                    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("<td rowspan= '" + rowSpan + "' colspan= '"+ colSpan + "' ");
                } else if (map[1].containsKey(rowNum + "," + colNum)) {
                    map[1].remove(rowNum + "," + colNum);
                    continue;
                } else {
                    sb.append("<td ");
                }

                //判断是否需要样式
                if(isWithStyle){
                    dealExcelStyle(wb, sheet, cell, sb);//处理单元格样式
                }

                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("</td>");
            }
            sb.append("</tr>");
        }

        sb.append("</table>");
        return 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;
    }


    /**
     * 获取表格单元格Cell内容
     * @param cell
     * @return
     */
    private static String getCellValue(Cell cell) {
//        FormulaEvaluator evaluator=wb.getCreationHelper().createFormulaEvaluator();
        DecimalFormat df = new DecimalFormat("0");
        DecimalFormat dfFloar = new DecimalFormat("0.00");
        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 {

                    Object val= cell.getNumericCellValue();
                    Boolean isNum = false;//data是否为数值型
//                    Boolean isInteger=false;//data是否为整数
//                    Boolean isPercent=false;//data是否为百分数
                    if (val != null || "".equals(val)) {
                            val=val.toString().trim();
                            //判断data是否为数值型
                            isNum = val.toString().matches("^(-?\\d+)(\\.\\d+)?$");
                            //判断data是否为整数（小数部分是否为0）
//                            isInteger=val.toString().matches("^[-\\+]?[\\d]*$");
                            //判断data是否为百分数（是否包含“%”）
//                            isPercent=val.toString().contains("%");
                    }
                    //如果单元格内容是数值类型，涉及到金钱（金额、本、利），则设置cell的类型为数值型，设置data的类型为数值类型
                    if (isNum) {
                        String valTe=(String)val;
                        if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
                            result=(valTe.split("\\.")[0]);
                        }
                    } else {
                        String valTe=dfFloar.format(cell.getNumericCellValue());
                        if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
                            result=(valTe.split("\\.")[0]);
                        }
//                        result = dfFloar.format(cell.getNumericCellValue());
                    }
//                     result = 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);
//                    result = String.valueOf(value);
                }
                break;
            case Cell.CELL_TYPE_STRING:// String类型
                result = cell.getRichStringCellValue().toString();
                break;
            case Cell.CELL_TYPE_BLANK:
                result = "";
                break;
            case Cell.CELL_TYPE_FORMULA:
                try {
                    Object val= cell.getNumericCellValue();
                    Boolean isNum = false;//data是否为数值型
//                    Boolean isInteger=false;//data是否为整数
//                    Boolean isPercent=false;//data是否为百分数
                    if (val != null || "".equals(val)) {
                        val=val.toString().trim();
                        //判断data是否为数值型
                        isNum = val.toString().matches("^(-?\\d+)(\\.\\d+)?$");
                        //判断data是否为整数（小数部分是否为0）
//                            isInteger=val.toString().matches("^[-\\+]?[\\d]*$");
                        //判断data是否为百分数（是否包含“%”）
//                            isPercent=val.toString().contains("%");
                    }
                    //如果单元格内容是数值类型，涉及到金钱（金额、本、利），则设置cell的类型为数值型，设置data的类型为数值类型
                    if (isNum) {
                        String valTe=(String)val;
                        if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
                            result=(valTe.split("\\.")[0]);
                        }
                    } else {
                        result = dfFloar.format(cell.getNumericCellValue());
                    }
//                    result = String.valueOf(cell.getNumericCellValue());
                } catch (IllegalStateException e) {
                    result = String.valueOf(cell.getRichStringCellValue());
                }
                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) {
            cellStyle.setWrapText(true);
            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 || (wb instanceof SXSSFWorkbook) ) {

                XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
                short boldWeight = xf.getBoldweight();
                String  align = convertAlignToHtml(alignment);
                sb.append("style='");
                sb.append("word-wrap:break-word;"); // 自动换行
                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("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>Html Test</title></head><body>");
            sb.append("<div>");
            sb.append(content);
            sb.append("</div>");
            sb.append("</body></html>");

            PrintStream printStream = new PrintStream(new FileOutputStream(file2));
            printStream.println(sb.toString());//将字符串写入文件

        } catch (IOException e) {

            e.printStackTrace();
        }

    }
}
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