在springboot中如何实现将office组件转化成pdf 如何在浏览器预览pdf文件 springboot word转html

最近公司有需求word转html，这里记录一下方便以后使用。

• 添加maven依赖

<dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-spring-boot-starter</artifactId>
            <version>4.2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml-schemas</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.0.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>ooxml-schemas</artifactId>
            <version>1.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-scratchpad -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>4.0.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.xmlgraphics/batik-transcoder -->
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-transcoder</artifactId>
            <version>1.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/net.arnx/wmf2svg -->
        <dependency>
            <groupId>net.arnx</groupId>
            <artifactId>wmf2svg</artifactId>
            <version>0.9.8</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/fr.opensagres.xdocreport/org.apache.poi.xwpf.converter.xhtml -->
        <dependency>
            <groupId>fr.opensagres.xdocreport</groupId>
            <artifactId>org.apache.poi.xwpf.converter.xhtml</artifactId>
            <version>1.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.11.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/jaxen/jaxen -->
        <dependency>
            <groupId>jaxen</groupId>
            <artifactId>jaxen</artifactId>
            <version>1.1.6</version>
        </dependency>

• doc转html
  工具类代码如下：

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FilenameUtils;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.converter.PicturesManager;
import org.apache.poi.hwpf.converter.WordToHtmlConverter;
import org.apache.poi.hwpf.model.PicturesTable;
import org.apache.poi.hwpf.model.TextPieceTable;
import org.apache.poi.hwpf.usermodel.Picture;
import org.apache.poi.hwpf.usermodel.PictureType;
import org.apache.poi.hwpf.usermodel.Table;
import org.apache.poi.hwpf.usermodel.TableIterator;
import org.apache.poi.xwpf.converter.core.BasicURIResolver;
import org.apache.poi.xwpf.converter.core.FileImageExtractor;
import org.apache.poi.xwpf.converter.core.FileURIResolver;
import org.apache.poi.xwpf.converter.xhtml.XHTMLConverter;
import org.apache.poi.xwpf.converter.xhtml.XHTMLOptions;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFPictureData;
import org.apache.poi.xwpf.usermodel.XWPFTableCell;
import org.springframework.util.ResourceUtils;
import org.w3c.dom.Document;


/**
 * doc文档操作
 * 依赖
 * poi-3.13.jar
 * poi-scratchpad-3.13.jar
 * commonbean.jar
 *
 * @author yellowcong
 * @date 2016年1月8日
 *
 * 重要方法
 * copyDocToHtml 将文档转化为html
 * 这个将doc转化为html的文档，没有分页的功能和图片裁减功能，所以导致的显示结果并非很理想
 *
 * copyHtmlToDoc 将html转化为文档
 *
 * 这个copyHtmlToDoc的方法还没有写完，比较的麻烦，所以需要慢慢的弄好
 *
 */
@Slf4j
public class DocUtils {
    //用于存储我们的文件的前缀名称，有内部类，所以需要加入static才可以访问
    static String prefixName = "";
    private DocUtils(){}
 
 	public static void main(String[] args) throws Exception {
		//文件所在目录
        File file = new File("C:\\D\\test.doc");
        //doc转html
        docToHtml(file);
        //docx 转html（试验不成功）
        docxToHtml();
    }

    /**
     * 将我们的doc转化为html文档
     * 这个直接输入我们的doc地址，然后就在那个地址下面生成对应的文件，简单方便
     * @param file  doc文件
     */
    public static void docToHtml(File file){
        String name = getFileSimpleName(file.getPath())+".html";
        DocUtils.copyDocToHtml(file, new File(name));
    }

    public static String getFileSimpleName(String path){

        log.info("文件路径：{}",path);
        return path.substring(0,path.lastIndexOf("."));
    }


    /**
     * 将doc转化为html
     * @param file 我们的 doc文档
     * @param tagart 生成的文档
     */
    private static void copyDocToHtml(File file,File tagart){

        try {
            //获取文件夹名称
            prefixName = FilenameUtils.getBaseName(tagart.getName());

            //如果没有，就创建目标文件夹
            //simpleName  这种方法会去掉  后缀名称
            File imgFile = new File(getFileSimpleName(tagart.getPath()));
            if(!imgFile.exists()){
                imgFile.mkdirs();
            }

            HWPFDocument doc = new HWPFDocument(new FileInputStream(file));
            //初始化转换器
            WordToHtmlConverter converter = new WordToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());
            //设定图片管理
            converter.setPicturesManager(new PicturesManager() {
                @Override
                public String savePicture(byte[] paramArrayOfByte,
                                          PictureType paramPictureType, String paramString,
                                          float paramFloat1, float paramFloat2) {
                    //这里也可以将图片上传到文件服务器 然后返回图片url地址
//                    return "https://bkimg.cdn.bcebos.com/formula/b9b2c43b9e825cbc2307b2eb9c729128.svg";
                    //设定图片路径
                    return prefixName+File.separator+paramString.replace(".wmf",".svg");
                }
            });
            converter.processDocument(doc);
            //设定图片
            List<Picture> pics = DocUtils.listDocPics(doc);
            //存储图片，根据给定的名称
            for(Picture pic:pics){
                //将文件直接写出去
                pic.writeImageContent(new FileOutputStream(new File(imgFile,pic.suggestFullFileName())));
                if (pic.suggestFullFileName().contains(".wmf")){        //如果图片资源是wmf格式 需要转换成svg格式才能正常显示
                    String picName = pic.suggestFullFileName().replace(".wmf",".svg");
                    Wmf2Png.wmfToSvg(imgFile + "\\" + pic.suggestFullFileName(),imgFile + "\\"  + picName);
                }
            }

            //导入w3c的document包
            Document docHtml = converter.getDocument();
            DOMSource source = new DOMSource(docHtml);

            //数据
            //ByteOutputStream out  = new ByteOutputStream();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            StreamResult result = new StreamResult(out);

            TransformerFactory tf =TransformerFactory.newInstance();
            Transformer trans = tf.newTransformer();
            trans.setOutputProperty(OutputKeys.INDENT, "yes");
            trans.setOutputProperty(OutputKeys.METHOD, "html");
            trans.setOutputProperty(OutputKeys.INDENT, "yes");

            trans.transform(source, result);
            //输出文件
            DocUtils.copyByte2File(out.toByteArray(),tagart);
            out.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerFactoryConfigurationError e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }


    /**
     * 将字符数据转化为我们的文件
     * @param data 字节数组
     * @param file 输出文件
     */
    private static void copyByte2File(byte [] data,File file){
        if ((data == null) || (data.length <= 0))
            return;

        OutputStream out = null;
        InputStream in = null;
        try {
            out = new FileOutputStream(file);
            in = new ByteArrayInputStream(data);

            //in = new ByteInputStream(data,data.length );
            byte [] buff = new byte[1024];
            int len =  0;
            while((len = in.read(buff))>0){
                out.write(buff, 0, len);
            }
            out.flush();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                if(in != null){
                    in.close();
                }
            } catch (Exception e2) {
                // TODO: handle exception
            }finally{
                try {
                    if(out != null){
                        out.close();
                    }
                } catch (Exception e3) {
                    // TODO: handle exception
                }
            }
        }
    }

    /**
     * 将文档中的图片存到文件夹中
     * @param pics 图片集合
     * @param path 文件存储路径
     */
    public static void copyPic2Disk(List<Picture> pics,File path){
        if(pics == null  || pics.size()  <=0){
            return;
        }
        if(!path.isDirectory()){
            throw new RuntimeException("路径填写不正确");
        }
        //当文件夹路径不存在的情况下，我们自己创建文件夹目录
        if(!path.exists() ){
            path.mkdirs();
        }

        try {
            for(Picture pic:pics){
                //写出数据，我们使用的是Poi类中，Picture自己所带的函数
                pic.writeImageContent(new FileOutputStream(new File(path,pic.suggestFullFileName())));
//              pic.getContent(); //获取字节流，也可以自己写入数据
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    /**
     * 获取一个文档中的所有图片资源信息
     * @param doc
     * @return List<Picture> 图片文件集合
     */
    public static List<Picture> listDocPics(HWPFDocument doc){
        return doc.getPicturesTable().getAllPictures();
    }

    /**
     * 获取一个文档中的所有 表格资源信息
     * @param doc
     * @return List<Table> 文件中表格的数目
     */
    public static List<Table> listDocTables(HWPFDocument doc){
        //
        TableIterator it = new TableIterator(doc.getRange());
        List<Table> tables = new ArrayList<Table>();
        while(it.hasNext()){
            tables.add(it.next());
        }
        return tables;

    }


    public static String docxToHtml() throws Exception {
        File path = new File(ResourceUtils.getURL("classpath:").getPath());
        String imagePath = path.getAbsolutePath() + "\\static\\image";
        String sourceFileName = path.getAbsolutePath() + "\\static\\test.docx";
        String targetFileName = path.getAbsolutePath() + "\\static\\test.html";
        OutputStreamWriter outputStreamWriter = null;
        try {
            XWPFDocument document = new XWPFDocument(new FileInputStream(sourceFileName));
            XHTMLOptions options = XHTMLOptions.create();
            // 存放图片的文件夹
            options.setExtractor(new FileImageExtractor(new File(imagePath)));
            // html中图片的路径
            options.URIResolver(new BasicURIResolver("image"));
            outputStreamWriter = new OutputStreamWriter(new FileOutputStream(targetFileName), "utf-8");
            XHTMLConverter xhtmlConverter = (XHTMLConverter) XHTMLConverter.getInstance();
            xhtmlConverter.convert(document, outputStreamWriter, options);
        } finally {
            if (outputStreamWriter != null) {
                outputStreamWriter.close();
            }
        }
        return targetFileName;
    }

    public static void docx2Html(){
        String path="C:\\D\\testx.docx";
        String imagePath="C:\\D\\testx\\";
        String outPath="C:\\D\\testx.html";
        File file=new File(path);
        File imageFile=new File(imagePath);
        if(!file.exists()){
            System.out.println("文件不存在!");
        }
        try {
            InputStream in=new FileInputStream(file);
            XWPFDocument document=new XWPFDocument(in);
            //存储图片
            XHTMLOptions options=XHTMLOptions.create().URIResolver(new FileURIResolver(imageFile));
            options.setExtractor(new FileImageExtractor(imageFile));
            OutputStream out=new FileOutputStream(outPath);
            /*Writer writer=new FileWriter(file,true);
            IContentHandlerFactory factory = options.getContentHandlerFactory();
            if (factory == null) {
                factory = DefaultContentHandlerFactory.INSTANCE;
            }
            ContentHandler contentHandler = factory.create(out, writer, options);
            //XHTMLConverter.getInstance().convert(document,out,options);*/
            XHTMLConverter converter=new XHTMLConverter();
            converter.convert(document,out,options);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

swf转svg图片工具类

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Scanner;
import java.util.zip.GZIPOutputStream;

import javax.xml.parsers.DocumentBuilder;
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 net.arnx.wmf2svg.gdi.svg.SvgGdi;
import net.arnx.wmf2svg.gdi.wmf.WmfParser;

import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.TranscodingHints;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.batik.transcoder.wmf.tosvg.WMFTranscoder;
import org.apache.commons.lang.StringUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Wmf2Png {
    public static void main(String[] args) throws Exception {
        // convert("F:\\SVN\\BobUtil\\web\\25177.wmf");
        // System.out.println((20 / (21 * 1.0)));
        // svgToPng("F:\\SVN\\BobUtil\\web\\25177.svg", "F:\\SVN\\BobUtil\\web\\25177.png");
    }

    /**
     * @Description: 进行转换
     * @param filePath
     *            文件路径
     * @return 设定文件
     */
    public static String convert(String filePath) {
        String pngFile = "";
        File wmfFile = new File(filePath);
        try {
            if (!wmfFile.getName().contains(".wmf")) {
                throw new Exception("请确认输入的文件类型是wmf");
            }
            // wmf -> svg
            String svgFile = filePath.replace("wmf", "svg");
            wmfToSvg(filePath, svgFile);
            // 对svg做预出理
            PreprocessSvgFile(svgFile);
            // svg -> png
            pngFile = filePath.replace("wmf", "png");
            svgToPng(svgFile, pngFile);
            // 删除 svg
            File file = new File(svgFile);
            if (file.exists()) {
                file.delete();
            }
            // 删除 wmf
            if (wmfFile.exists()) {
                wmfFile.delete();
            }

        } catch (Exception e) {
            try {
                e.printStackTrace();
                wmfToJpg(filePath);
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        return wmfFile.getName().replace("wmf", "png");
    }

    /**
     * 将wmf转换为svg
     *
     * @param src
     * @param dest
     */
    public static OutputStream wmfToSvgFile(File wmfFile, String dest) throws Exception {
        boolean compatible = false;
        try {
            InputStream in = new FileInputStream(wmfFile);
            WmfParser parser = new WmfParser();
            final SvgGdi gdi = new SvgGdi(compatible);
            parser.parse(in, gdi);
            Document doc = gdi.getDocument();
            OutputStream out = new FileOutputStream(dest);
            if (dest.endsWith(".svgz")) {
                out = new GZIPOutputStream(out);
            }
            getOutput(doc,out);
            return out;
            //output(doc, out);
        } catch (Exception e) {
            throw e;
        }
    }

    /**
     * 将wmf转换为svg
     *
     * @param src
     * @param dest
     */
    public static void wmfToSvg(String src, String dest) throws Exception {
        boolean compatible = false;
        try {
            InputStream in = new FileInputStream(src);
            WmfParser parser = new WmfParser();
            final SvgGdi gdi = new SvgGdi(compatible);
            parser.parse(in, gdi);

            Document doc = gdi.getDocument();
            OutputStream out = new FileOutputStream(dest);
            if (dest.endsWith(".svgz")) {
                out = new GZIPOutputStream(out);
            }

            output(doc, out);
        } catch (Exception e) {
            throw e;
        }
    }

    /**
     * @Description: 输出svg文件
     * @param doc
     * @param out
     * @throws Exception
     *             设定文件
     */
    private static void output(Document doc, OutputStream out) throws Exception {
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "-//W3C//DTD SVG 1.0//EN");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,
                "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd");
        transformer.transform(new DOMSource(doc), new StreamResult(out));
        out.flush();
        out.close();
        out = null;
    }

    /**
     * @Description: 输出svg文件
     * @param doc
     * @param out
     * @throws Exception
     *             设定文件
     */
    private static void getOutput(Document doc, OutputStream out) throws Exception {
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "-//W3C//DTD SVG 1.0//EN");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,
                "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd");
        transformer.transform(new DOMSource(doc), new StreamResult(out));
//        out.flush();
//        out.close();
//        out = null;
    }

    /**
     * @Description:对svg文件做预处理(这里主要是调整大小，先缩小10倍，如果还大于默认值，则按比例缩小)
     * @param svgFile
     * @throws Exception
     *             设定文件
     */
    private static void PreprocessSvgFile(String svgFile) throws Exception {
        int defaultWeight = 500;// 默认宽度
        FileInputStream inputs = new FileInputStream(svgFile);
        Scanner sc = new Scanner(inputs, "UTF-8");
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        while (sc.hasNextLine()) {
            String ln = sc.nextLine();
            if (!ln.startsWith("<!DOCTYPE")) {
                os.write((ln + "\r\n").getBytes());
            }
        }
        os.flush();

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder;
        builder = factory.newDocumentBuilder();
        Document doc = null;
        try {
            doc = builder.parse(new ByteArrayInputStream(os.toByteArray()));
        } catch (Exception e) {
            inputs = new FileInputStream(svgFile);
            os = new ByteArrayOutputStream();
            int noOfByteRead = 0;
            while ((noOfByteRead = inputs.read()) != -1) {
                os.write(noOfByteRead);
            }
            os.flush();
            doc = builder.parse(new ByteArrayInputStream(os.toByteArray()));
        } finally {
            os.close();
            inputs.close();
        }

        int height = Integer.parseInt(((Element) doc.getElementsByTagName("svg").item(0)).getAttribute("height"));
        int width = Integer.parseInt(((Element) doc.getElementsByTagName("svg").item(0)).getAttribute("width"));
        int newHeight = 0;// 新高
        int newWidth = 0;// 新宽
        newHeight = height / 10;// 高缩小10倍
        newWidth = width / 10; // 宽缩小10倍
        // 如果缩小10倍后宽度还比defaultHeight大，则进行调整
        if (newWidth > defaultWeight) {
            newWidth = defaultWeight;
            newHeight = defaultWeight * height / width;
        }

        ((Element) doc.getElementsByTagName("svg").item(0)).setAttribute("width", String.valueOf(newWidth));
        ((Element) doc.getElementsByTagName("svg").item(0)).setAttribute("height", String.valueOf(newHeight));
        OutputStream out = new FileOutputStream(svgFile);
        output(doc, out);
    }

    /**
     * 将svg图片转成png图片
     *
     * @param filePath
     * @throws Exception
     */
    public static void svgToPng(String svgPath, String pngFile) throws Exception {
        File svg = new File(svgPath);
        FileInputStream wmfStream = new FileInputStream(svg);
        ByteArrayOutputStream imageOut = new ByteArrayOutputStream();
        int noOfByteRead = 0;
        while ((noOfByteRead = wmfStream.read()) != -1) {
            imageOut.write(noOfByteRead);
        }
        imageOut.flush();
        imageOut.close();
        wmfStream.close();

        ByteArrayOutputStream jpg = new ByteArrayOutputStream();
        FileOutputStream jpgOut = new FileOutputStream(pngFile);

        byte[] bytes = imageOut.toByteArray();
        PNGTranscoder t = new PNGTranscoder();
        TranscoderInput in = new TranscoderInput(new ByteArrayInputStream(bytes));
        TranscoderOutput out = new TranscoderOutput(jpg);
        t.transcode(in, out);
        jpgOut.write(jpg.toByteArray());
        jpgOut.flush();
        jpgOut.close();
        imageOut = null;
        jpgOut = null;
    }

    /**
     * 将wmf图片转成png图片(备用方法，即当上面的转换失败时用这个)
     *
     * @param filePath
     * @throws Exception
     */
    public static String wmfToJpg(String wmfPath) throws Exception {
        //先wmf-->svg
        File wmf = new File(wmfPath);
        FileInputStream wmfStream = new FileInputStream(wmf);
        ByteArrayOutputStream imageOut = new ByteArrayOutputStream();
        int noOfByteRead = 0;
        while ((noOfByteRead = wmfStream.read()) != -1) {
            imageOut.write(noOfByteRead);
        }
        imageOut.flush();
        imageOut.close();
        wmfStream.close();

        // WMFHeaderProperties prop = new WMFHeaderProperties(wmf);
        WMFTranscoder transcoder = new WMFTranscoder();
        TranscodingHints hints = new TranscodingHints();
        transcoder.setTranscodingHints(hints);
        TranscoderInput input = new TranscoderInput(new ByteArrayInputStream(imageOut.toByteArray()));
        ByteArrayOutputStream svg = new ByteArrayOutputStream();
        TranscoderOutput output = new TranscoderOutput(svg);
        transcoder.transcode(input, output);

        //再svg-->png
        ByteArrayOutputStream jpg = new ByteArrayOutputStream();
        String jpgFile = StringUtils.replace(wmfPath, "wmf", "png");
        FileOutputStream jpgOut = new FileOutputStream(jpgFile);

        byte[] bytes = svg.toByteArray();
        PNGTranscoder t = new PNGTranscoder();
        TranscoderInput in = new TranscoderInput(new ByteArrayInputStream(bytes));
        TranscoderOutput out = new TranscoderOutput(jpg);
        t.transcode(in, out);
        jpgOut.write(jpg.toByteArray());
        jpgOut.flush();
        jpgOut.close();
        return jpgFile;
    }
}

• 验证
  运行main程序结果如下：
  
  excel文档图片存储如下：
  
  在线预览test.html,如下：