（POI）Excel格式转Html格式

Demo结构和引用的Jar包

源代码(TestDemo.java)

POI中将Excel转换为HTML方法仅能转换HSSFWorkBook类型（即03版xls），故可以先将读取的xlsx文件转换成xls文件再调用该方法统一处理

package test;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.InputStream;

import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import org.apache.poi.hssf.converter.ExcelToHtmlConverter;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.w3c.dom.Document;

public class TestDemo {

	final static String path = "D:\\EclipseWorkspace\\ExcelToHtmlDemo\\ExcelToHtml\\";

	final static String file = "TestExcel.xlsx";

        private static final String EXCEL_XLS = "xls";

        private static final String EXCEL_XLSX = "xlsx";  

	public static void main(String[] args)

	{

		try{

	        InputStream input = new FileInputStream(path +"/"+ file);

	        HSSFWorkbook excelBook = new HSSFWorkbook();

	        //判断Excel文件将07+版本转换为03版本

	        if(file.endsWith(EXCEL_XLS)){  //Excel 2003

	        	excelBook = new HSSFWorkbook(input);

	        }

	        else if(file.endsWith(EXCEL_XLSX)){  // Excel 2007/2010

	        	Transform xls = new Transform();

	        	XSSFWorkbook workbookOld = new XSSFWorkbook(input);

	            　　 xls.transformXSSF(workbookOld, excelBook);

	        }  

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

	        //去掉Excel头行

	        excelToHtmlConverter.setOutputColumnHeaders(false);

	        //去掉Excel行号

	        excelToHtmlConverter.setOutputRowNumbers(false);  

	        excelToHtmlConverter.processWorkbook(excelBook); 

	        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, "gb2312");

	        serializer.setOutputProperty(OutputKeys.INDENT, "yes");

	        serializer.setOutputProperty(OutputKeys.METHOD, "html");  

	        serializer.transform(domSource, streamResult);

	        outStream.close();  

	        //Excel转换成Html

	        String content = new String(outStream.toByteArray());

                System.out.println(content);

		}

		catch(Exception e) {

			e.printStackTrace();

		}

	}

}

源代码(Transform.java)　将xlsx文件转换成xls文件。（可以处理合并单元格，边框等格式问题！！！）

package test;

import java.util.HashMap;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.DataFormat;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.util.CellRangeAddress;

import org.apache.poi.xssf.usermodel.XSSFCell;

import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import org.apache.poi.xssf.usermodel.XSSFFont;

import org.apache.poi.xssf.usermodel.XSSFRow;

import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Transform {  

    private int lastColumn = 0;

    private HashMap<Integer, HSSFCellStyle> styleMap = new HashMap();  

    public void transformXSSF(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew) {

        HSSFSheet sheetNew;

        XSSFSheet sheetOld;  

        workbookNew.setMissingCellPolicy(workbookOld.getMissingCellPolicy());  

        for (int i = 0; i < workbookOld.getNumberOfSheets(); i++) {

            sheetOld = workbookOld.getSheetAt(i);

            sheetNew = workbookNew.getSheet(sheetOld.getSheetName());

            sheetNew = workbookNew.createSheet(sheetOld.getSheetName());

            this.transform(workbookOld, workbookNew, sheetOld, sheetNew);

        }

    }  

    private void transform(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew,

            XSSFSheet sheetOld, HSSFSheet sheetNew) {  

        sheetNew.setDisplayFormulas(sheetOld.isDisplayFormulas());

        sheetNew.setDisplayGridlines(sheetOld.isDisplayGridlines());

        sheetNew.setDisplayGuts(sheetOld.getDisplayGuts());

        sheetNew.setDisplayRowColHeadings(sheetOld.isDisplayRowColHeadings());

        sheetNew.setDisplayZeros(sheetOld.isDisplayZeros());

        sheetNew.setFitToPage(sheetOld.getFitToPage());  

        sheetNew.setHorizontallyCenter(sheetOld.getHorizontallyCenter());

        sheetNew.setMargin(Sheet.BottomMargin,

                sheetOld.getMargin(Sheet.BottomMargin));

        sheetNew.setMargin(Sheet.FooterMargin,

                sheetOld.getMargin(Sheet.FooterMargin));

        sheetNew.setMargin(Sheet.HeaderMargin,

                sheetOld.getMargin(Sheet.HeaderMargin));

        sheetNew.setMargin(Sheet.LeftMargin,

                sheetOld.getMargin(Sheet.LeftMargin));

        sheetNew.setMargin(Sheet.RightMargin,

                sheetOld.getMargin(Sheet.RightMargin));

        sheetNew.setMargin(Sheet.TopMargin, sheetOld.getMargin(Sheet.TopMargin));

        sheetNew.setPrintGridlines(sheetNew.isPrintGridlines());

        sheetNew.setRightToLeft(sheetNew.isRightToLeft());

        sheetNew.setRowSumsBelow(sheetNew.getRowSumsBelow());

        sheetNew.setRowSumsRight(sheetNew.getRowSumsRight());

        sheetNew.setVerticallyCenter(sheetOld.getVerticallyCenter());  

        HSSFRow rowNew;

        for (Row row : sheetOld) {

            rowNew = sheetNew.createRow(row.getRowNum());

            if (rowNew != null)

                this.transform(workbookOld, workbookNew, (XSSFRow) row, rowNew);

        }  

        for (int i = 0; i < this.lastColumn; i++) {

            sheetNew.setColumnWidth(i, sheetOld.getColumnWidth(i));

            sheetNew.setColumnHidden(i, sheetOld.isColumnHidden(i));

        }  

        for (int i = 0; i < sheetOld.getNumMergedRegions(); i++) {

            CellRangeAddress merged = sheetOld.getMergedRegion(i);

            sheetNew.addMergedRegion(merged);

        }

    }  

    private void transform(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew,

            XSSFRow rowOld, HSSFRow rowNew) {

        HSSFCell cellNew;

        rowNew.setHeight(rowOld.getHeight());  

        for (Cell cell : rowOld) {

            cellNew = rowNew.createCell(cell.getColumnIndex(),

                    cell.getCellType());

            if (cellNew != null)

                this.transform(workbookOld, workbookNew, (XSSFCell) cell,

                        cellNew);

        }

        this.lastColumn = Math.max(this.lastColumn, rowOld.getLastCellNum());

    }  

    private void transform(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew,

            XSSFCell cellOld, HSSFCell cellNew) {

        cellNew.setCellComment(cellOld.getCellComment());  

        Integer hash = cellOld.getCellStyle().hashCode();

        if (this.styleMap != null && !this.styleMap.containsKey(hash)) {

            this.transform(workbookOld, workbookNew, hash,

                    cellOld.getCellStyle(),

                    (HSSFCellStyle) workbookNew.createCellStyle());

        }

        cellNew.setCellStyle(this.styleMap.get(hash));  

        switch (cellOld.getCellType()) {

        case Cell.CELL_TYPE_BLANK:

            break;

        case Cell.CELL_TYPE_BOOLEAN:

            cellNew.setCellValue(cellOld.getBooleanCellValue());

            break;

        case Cell.CELL_TYPE_ERROR:

            cellNew.setCellValue(cellOld.getErrorCellValue());

            break;

        case Cell.CELL_TYPE_FORMULA:

            cellNew.setCellValue(cellOld.getCellFormula());

            break;

        case Cell.CELL_TYPE_NUMERIC:

            cellNew.setCellValue(cellOld.getNumericCellValue());

            break;

        case Cell.CELL_TYPE_STRING:

            cellNew.setCellValue(cellOld.getStringCellValue());

            break;

        default:

            System.out.println("transform: Unbekannter Zellentyp "

                    + cellOld.getCellType());

        }

    }  

    private void transform(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew,

            Integer hash, XSSFCellStyle styleOld, HSSFCellStyle styleNew) {

        styleNew.setAlignment(styleOld.getAlignment());

        styleNew.setBorderBottom(styleOld.getBorderBottom());

        styleNew.setBorderLeft(styleOld.getBorderLeft());

        styleNew.setBorderRight(styleOld.getBorderRight());

        styleNew.setBorderTop(styleOld.getBorderTop());

        styleNew.setDataFormat(this.transform(workbookOld, workbookNew,

                styleOld.getDataFormat()));

        styleNew.setFillBackgroundColor(styleOld.getFillBackgroundColor());

        styleNew.setFillForegroundColor(styleOld.getFillForegroundColor());

        styleNew.setFillPattern(styleOld.getFillPattern());

        styleNew.setFont(this.transform(workbookNew,

                (XSSFFont) styleOld.getFont()));

        styleNew.setHidden(styleOld.getHidden());

        styleNew.setIndention(styleOld.getIndention());

        styleNew.setLocked(styleOld.getLocked());

        styleNew.setVerticalAlignment(styleOld.getVerticalAlignment());

        styleNew.setWrapText(styleOld.getWrapText());

        this.styleMap.put(hash, styleNew);

    }  

    private short transform(XSSFWorkbook workbookOld, HSSFWorkbook workbookNew,

            short index) {

        DataFormat formatOld = workbookOld.createDataFormat();

        DataFormat formatNew = workbookNew.createDataFormat();

        return formatNew.getFormat(formatOld.getFormat(index));

    }  

    private HSSFFont transform(HSSFWorkbook workbookNew, XSSFFont fontOld) {

        HSSFFont fontNew = workbookNew.createFont();

        fontNew.setBoldweight(fontOld.getBoldweight());

        fontNew.setCharSet(fontOld.getCharSet());

        fontNew.setColor(fontOld.getColor());

        fontNew.setFontName(fontOld.getFontName());

        fontNew.setFontHeight(fontOld.getFontHeight());

        fontNew.setItalic(fontOld.getItalic());

        fontNew.setStrikeout(fontOld.getStrikeout());

        fontNew.setTypeOffset(fontOld.getTypeOffset());

        fontNew.setUnderline(fontOld.getUnderline());

        return fontNew;

    }

}

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