Преобразование электронных таблиц Excel в HTML с использованием библиотеки Apache POI - PullRequest
10 голосов
/ 16 марта 2012

Я пытаюсь использовать класс ExcelToHtmlConverter для преобразования текстового документа в HTML, но документация не ясна.

У кого-нибудь есть пример программы о том, как загрузить документ Excel и преобразовать его в HTML.

Ответы [ 4 ]

12 голосов
/ 16 марта 2012

Вы смотрели на это ?: http://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/ss/examples/html/ToHtml.java

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   this work for additional information regarding copyright ownership.
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   (the "License"); you may not use this file except in compliance with
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package org.apache.poi.ss.examples.html;

import java.io.BufferedReader;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Formatter;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.format.CellFormat;
import org.apache.poi.ss.format.CellFormatResult;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * This example shows how to display a spreadsheet in HTML using the classes for
 * spreadsheet display.
 */
public class ToHtml {
    private final Workbook wb;
    private final Appendable output;
    private boolean completeHTML;
    private Formatter out;
    private boolean gotBounds;
    private int firstColumn;
    private int endColumn;
    private HtmlHelper helper;

    private static final String DEFAULTS_CLASS = "excelDefaults";
    private static final String COL_HEAD_CLASS = "colHeader";
    private static final String ROW_HEAD_CLASS = "rowHeader";

    private static final Map<HorizontalAlignment, String> HALIGN = mapFor(
            HorizontalAlignment.LEFT, "left",
            HorizontalAlignment.CENTER, "center",
            HorizontalAlignment.RIGHT, "right",
            HorizontalAlignment.FILL, "left",
            HorizontalAlignment.JUSTIFY, "left",
            HorizontalAlignment.CENTER_SELECTION, "center");

    private static final Map<VerticalAlignment, String> VALIGN = mapFor(
            VerticalAlignment.BOTTOM, "bottom",
            VerticalAlignment.CENTER, "middle",
            VerticalAlignment.TOP, "top");

    private static final Map<BorderStyle, String> BORDER = mapFor(
            BorderStyle.DASH_DOT, "dashed 1pt",
            BorderStyle.DASH_DOT_DOT, "dashed 1pt",
            BorderStyle.DASHED, "dashed 1pt",
            BorderStyle.DOTTED, "dotted 1pt",
            BorderStyle.DOUBLE, "double 3pt",
            BorderStyle.HAIR, "solid 1px",
            BorderStyle.MEDIUM, "solid 2pt",
            BorderStyle.MEDIUM_DASH_DOT, "dashed 2pt",
            BorderStyle.MEDIUM_DASH_DOT_DOT, "dashed 2pt",
            BorderStyle.MEDIUM_DASHED, "dashed 2pt",
            BorderStyle.NONE, "none",
            BorderStyle.SLANTED_DASH_DOT, "dashed 2pt",
            BorderStyle.THICK, "solid 3pt",
            BorderStyle.THIN, "dashed 1pt");

    @SuppressWarnings({"unchecked"})
    private static <K, V> Map<K, V> mapFor(Object... mapping) {
        Map<K, V> map = new HashMap<K, V>();
        for (int i = 0; i < mapping.length; i += 2) {
            map.put((K) mapping[i], (V) mapping[i + 1]);
        }
        return map;
    }

    /**
     * Creates a new converter to HTML for the given workbook.
     *
     * @param wb     The workbook.
     * @param output Where the HTML output will be written.
     *
     * @return An object for converting the workbook to HTML.
     */
    public static ToHtml create(Workbook wb, Appendable output) {
        return new ToHtml(wb, output);
    }

    /**
     * Creates a new converter to HTML for the given workbook.  If the path ends
     * with "<tt>.xlsx</tt>" an {@link XSSFWorkbook} will be used; otherwise
     * this will use an {@link HSSFWorkbook}.
     *
     * @param path   The file that has the workbook.
     * @param output Where the HTML output will be written.
     *
     * @return An object for converting the workbook to HTML.
     */
    public static ToHtml create(String path, Appendable output)
            throws IOException {
        return create(new FileInputStream(path), output);
    }

    /**
     * Creates a new converter to HTML for the given workbook.  This attempts to
     * detect whether the input is XML (so it should create an {@link
     * XSSFWorkbook} or not (so it should create an {@link HSSFWorkbook}).
     *
     * @param in     The input stream that has the workbook.
     * @param output Where the HTML output will be written.
     *
     * @return An object for converting the workbook to HTML.
     */
    public static ToHtml create(InputStream in, Appendable output)
            throws IOException {
        try {
            Workbook wb = WorkbookFactory.create(in);
            return create(wb, output);
        } catch (InvalidFormatException e){
            throw new IllegalArgumentException("Cannot create workbook from stream", e);
        }
    }

    private ToHtml(Workbook wb, Appendable output) {
        if (wb == null) {
            throw new NullPointerException("wb");
        }
        if (output == null) {
            throw new NullPointerException("output");
        }
        this.wb = wb;
        this.output = output;
        setupColorMap();
    }

    private void setupColorMap() {
        if (wb instanceof HSSFWorkbook) {
            helper = new HSSFHtmlHelper((HSSFWorkbook) wb);
        } else if (wb instanceof XSSFWorkbook) {
            helper = new XSSFHtmlHelper();
        } else {
            throw new IllegalArgumentException(
                    "unknown workbook type: " + wb.getClass().getSimpleName());
        }
    }

    /**
     * Run this class as a program
     *
     * @param args The command line arguments.
     *
     * @throws Exception Exception we don't recover from.
     */
    public static void main(String[] args) throws Exception {
        if(args.length < 2){
            System.err.println("usage: ToHtml inputWorkbook outputHtmlFile");
            return;
        }

        ToHtml toHtml = create(args[0], new PrintWriter(new FileWriter(args[1])));
        toHtml.setCompleteHTML(true);
        toHtml.printPage();
    }

    public void setCompleteHTML(boolean completeHTML) {
        this.completeHTML = completeHTML;
    }

    public void printPage() throws IOException {
        try {
            ensureOut();
            if (completeHTML) {
                out.format(
                        "<?xml version=\"1.0\" encoding=\"iso-8859-1\" ?>%n");
                out.format("<html>%n");
                out.format("<head>%n");
                out.format("</head>%n");
                out.format("<body>%n");
            }

            print();

            if (completeHTML) {
                out.format("</body>%n");
                out.format("</html>%n");
            }
        } finally {
            IOUtils.closeQuietly(out);
            if (output instanceof Closeable) {
                IOUtils.closeQuietly((Closeable) output);
            }
        }
    }

    public void print() {
        printInlineStyle();
        printSheets();
    }

    private void printInlineStyle() {
        //out.format("<link href=\"excelStyle.css\" rel=\"stylesheet\" type=\"text/css\">%n");
        out.format("<style type=\"text/css\">%n");
        printStyles();
        out.format("</style>%n");
    }

    private void ensureOut() {
        if (out == null) {
            out = new Formatter(output);
        }
    }

    public void printStyles() {
        ensureOut();

        // First, copy the base css
        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader(
                    getClass().getResourceAsStream("excelStyle.css")));
            String line;
            while ((line = in.readLine()) != null) {
                out.format("%s%n", line);
            }
        } catch (IOException e) {
            throw new IllegalStateException("Reading standard css", e);
        } finally {
            IOUtils.closeQuietly(in);
        }

        // now add css for each used style
        Set<CellStyle> seen = new HashSet<CellStyle>();
        for (int i = 0; i < wb.getNumberOfSheets(); i++) {
            Sheet sheet = wb.getSheetAt(i);
            Iterator<Row> rows = sheet.rowIterator();
            while (rows.hasNext()) {
                Row row = rows.next();
                for (Cell cell : row) {
                    CellStyle style = cell.getCellStyle();
                    if (!seen.contains(style)) {
                        printStyle(style);
                        seen.add(style);
                    }
                }
            }
        }
    }

    private void printStyle(CellStyle style) {
        out.format(".%s .%s {%n", DEFAULTS_CLASS, styleName(style));
        styleContents(style);
        out.format("}%n");
    }

    private void styleContents(CellStyle style) {
        styleOut("text-align", style.getAlignmentEnum(), HALIGN);
        styleOut("vertical-align", style.getVerticalAlignmentEnum(), VALIGN);
        fontStyle(style);
        borderStyles(style);
        helper.colorStyles(style, out);
    }

    private void borderStyles(CellStyle style) {
        styleOut("border-left", style.getBorderLeftEnum(), BORDER);
        styleOut("border-right", style.getBorderRightEnum(), BORDER);
        styleOut("border-top", style.getBorderTopEnum(), BORDER);
        styleOut("border-bottom", style.getBorderBottomEnum(), BORDER);
    }

    private void fontStyle(CellStyle style) {
        Font font = wb.getFontAt(style.getFontIndex());

        if (font.getBold()) {
            out.format("  font-weight: bold;%n");
        }
        if (font.getItalic()) {
            out.format("  font-style: italic;%n");
        }

        int fontheight = font.getFontHeightInPoints();
        if (fontheight == 9) {
            //fix for stupid ol Windows
            fontheight = 10;
        }
        out.format("  font-size: %dpt;%n", fontheight);

        // Font color is handled with the other colors
    }

    private String styleName(CellStyle style) {
        if (style == null) {
            style = wb.getCellStyleAt((short) 0);
        }
        StringBuilder sb = new StringBuilder();
        Formatter fmt = new Formatter(sb);
        try {
            fmt.format("style_%02x", style.getIndex());
            return fmt.toString();
        } finally {
            fmt.close();
        }
    }

    private <K> void styleOut(String attr, K key, Map<K, String> mapping) {
        String value = mapping.get(key);
        if (value != null) {
            out.format("  %s: %s;%n", attr, value);
        }
    }

    private static CellType ultimateCellType(Cell c) {
        CellType type = c.getCellTypeEnum();
        if (type == CellType.FORMULA) {
            type = c.getCachedFormulaResultTypeEnum();
        }
        return type;
    }

    private void printSheets() {
        ensureOut();
        Sheet sheet = wb.getSheetAt(0);
        printSheet(sheet);
    }

    public void printSheet(Sheet sheet) {
        ensureOut();
        out.format("<table class=%s>%n", DEFAULTS_CLASS);
        printCols(sheet);
        printSheetContent(sheet);
        out.format("</table>%n");
    }

    private void printCols(Sheet sheet) {
        out.format("<col/>%n");
        ensureColumnBounds(sheet);
        for (int i = firstColumn; i < endColumn; i++) {
            out.format("<col/>%n");
        }
    }

    private void ensureColumnBounds(Sheet sheet) {
        if (gotBounds) {
            return;
        }

        Iterator<Row> iter = sheet.rowIterator();
        firstColumn = (iter.hasNext() ? Integer.MAX_VALUE : 0);
        endColumn = 0;
        while (iter.hasNext()) {
            Row row = iter.next();
            short firstCell = row.getFirstCellNum();
            if (firstCell >= 0) {
                firstColumn = Math.min(firstColumn, firstCell);
                endColumn = Math.max(endColumn, row.getLastCellNum());
            }
        }
        gotBounds = true;
    }

    private void printColumnHeads() {
        out.format("<thead>%n");
        out.format("  <tr class=%s>%n", COL_HEAD_CLASS);
        out.format("    <th class=%s>&#x25CA;</th>%n", COL_HEAD_CLASS);
        //noinspection UnusedDeclaration
        StringBuilder colName = new StringBuilder();
        for (int i = firstColumn; i < endColumn; i++) {
            colName.setLength(0);
            int cnum = i;
            do {
                colName.insert(0, (char) ('A' + cnum % 26));
                cnum /= 26;
            } while (cnum > 0);
            out.format("    <th class=%s>%s</th>%n", COL_HEAD_CLASS, colName);
        }
        out.format("  </tr>%n");
        out.format("</thead>%n");
    }

    private void printSheetContent(Sheet sheet) {
        printColumnHeads();

        out.format("<tbody>%n");
        Iterator<Row> rows = sheet.rowIterator();
        while (rows.hasNext()) {
            Row row = rows.next();

            out.format("  <tr>%n");
            out.format("    <td class=%s>%d</td>%n", ROW_HEAD_CLASS,
                    row.getRowNum() + 1);
            for (int i = firstColumn; i < endColumn; i++) {
                String content = "&nbsp;";
                String attrs = "";
                CellStyle style = null;
                if (i >= row.getFirstCellNum() && i < row.getLastCellNum()) {
                    Cell cell = row.getCell(i);
                    if (cell != null) {
                        style = cell.getCellStyle();
                        attrs = tagStyle(cell, style);
                        //Set the value that is rendered for the cell
                        //also applies the format
                        CellFormat cf = CellFormat.getInstance(
                                style.getDataFormatString());
                        CellFormatResult result = cf.apply(cell);
                        content = result.text;
                        if (content.equals("")) {
                            content = "&nbsp;";
                        }
                    }
                }
                out.format("    <td class=%s %s>%s</td>%n", styleName(style),
                        attrs, content);
            }
            out.format("  </tr>%n");
        }
        out.format("</tbody>%n");
    }

    private String tagStyle(Cell cell, CellStyle style) {
        if (style.getAlignmentEnum() == HorizontalAlignment.GENERAL) {
            switch (ultimateCellType(cell)) {
            case STRING:
                return "style=\"text-align: left;\"";
            case BOOLEAN:
            case ERROR:
                return "style=\"text-align: center;\"";
            case NUMERIC:
            default:
                // "right" is the default
                break;
            }
        }
        return "";
    }
}
2 голосов
/ 19 сентября 2018

Необходимые банки: пои-3.17.jarпои-примеры-3.17.jarпои-excelant-3.17.jarпои-OOXML-3.17.jarпои-OOXML-схемы-3.15.0.jardom4j-1.6.1.jarпои-блокнотная-3.17.jarXMLBeans-2.6.0.jar

    /**
     * Excel to HTML
     * 
     */
    public static void excel2Html(String filename, String htmlid, String ctxPath) throws Exception{
        InputStream input=new FileInputStream(filename);
         HSSFWorkbook excelBook=new HSSFWorkbook(input);
         ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());
         excelToHtmlConverter.processWorkbook(excelBook);
         List pics = excelBook.getAllPictures();
         if (pics != null) {
             for (int i = 0; i < pics.size(); i++) {
                 Picture pic = (Picture) pics.get (i);
                 try {
                     pic.writeImageContent(new FileOutputStream (ctxPath + pic.suggestFullFileName() ) );
                 } catch (FileNotFoundException e) {
                     e.printStackTrace();
                 }
             }
         }
         Document htmlDocument = excelToHtmlConverter.getDocument();
         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
         DOMSource domSource = new DOMSource (htmlDocument);
         StreamResult streamResult = new StreamResult(outStream);
         TransformerFactory tf = TransformerFactory.newInstance();
         Transformer serializer = tf.newTransformer();
         serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
         serializer.setOutputProperty(OutputKeys.INDENT, "yes");
         serializer.setOutputProperty(OutputKeys.METHOD, "html");
         serializer.transform (domSource, streamResult);
         outStream.close();

        OutputStream os = new FileOutputStream(new File(ctxPath, htmlid+".html"));
        final PrintStream printStream = new PrintStream(os);
        printStream.print(new String(outStream.toByteArray()));
        printStream.close();
    }
0 голосов
/ 07 июня 2018

Я оставляю этот пример, используя ExcelToHtmlConverter() здесь, потому что я нигде не мог найти его, когда искал ту же вещь.

HSSFWorkbook excelDoc = ExcelToHtmlUtils.loadXls(inputDocument);

ExcelToHtmlConverter converter = new ExcelToHtmlConverter(
    DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()
);

converter.processWorkbook(excelDoc);

Document htmlDoc = converter.getDocument();
ByteArrayOutputStream out = new ByteArrayOutputStream();
DOMSource domSource = new DOMSource(htmlDoc);
StreamResult streamResult = new StreamResult(out);
TransformerFactory transfFactory = TransformerFactory.newInstance();
Transformer serializer = transfFactory.newTransformer();

serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
serializer.setOutputProperty(OutputKeys.INDENT, "yes");
serializer.setOutputProperty(OutputKeys.METHOD, "html");
serializer.transform(domSource, streamResult);

out.close();

String result = new String(out.toByteArray());

Надеюсь, это поможет некоторым из вас.

0 голосов
/ 18 марта 2012

Проверка http://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/ss/examples/html/

Вам необходимо включить классы и таблицу стилей в ваш проект.Вы можете изменить рефакторинг и изменить имена пакетов на имена пакетов вашего проекта.

Также вы можете изменить стили в файле CSS "excelStyle.css", чтобы изменить цвета выходного HTML-кода.

...