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此演示向您展示如何将 pdf 文档转换为 docx、xps、html、图像等。

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import com.spire.pdf.fileformat;
import com.spire.pdf.pdfdocument;
import com.spire.pdf.conversion.pdfstandardsconverter;
import com.spire.pdf.graphics.pdfimagetype;
import javax.imageio.imageio;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.ioexception;
public class pdfconvertdemo {
    public void pdfconversion(string pdffile,string converttype) throws ioexception {
        string outputfilename = "output";
        pdfdocument pdf=new pdfdocument();
        pdf.loadfromfile(pdffile);
        pdfstandardsconverter standardsconverter = new pdfstandardsconverter(pdffile);
        switch (converttype) {
            case "docx":
                outputfilename  = ".docx";
                pdf.savetofile(outputfilename, fileformat.docx);
                break;
            case "doc":
                outputfilename  = ".doc";
                pdf.savetofile(outputfilename, fileformat.doc);
                break;
            case "xps":
                outputfilename  = ".xps";
                pdf.savetofile(outputfilename, fileformat.xps);
                break;
            case "xlsx":
                outputfilename  = ".xlsx";
                pdf.savetofile(outputfilename, fileformat.xlsx);
                break;
            case "postscript":
                outputfilename  = ".ps";
                pdf.savetofile(outputfilename, fileformat.postscript);
                break;
            case "html":
                outputfilename  = ".html";
                pdf.savetofile(outputfilename, fileformat.html);
                break;
            case "image":
                bufferedimage image=null;
                for (int i = 0; i < pdf.getpages().getcount(); i  ) {
                    image= pdf.saveasimage(i, pdfimagetype.bitmap);
                    imageio.write(image,"png",new file(outputfilename i ".png"));
                }
                break;
            case "svg":
                outputfilename =".svg";
                pdf.savetofile(outputfilename, fileformat.svg);
                break;
            case "tiff":
                outputfilename  = ".tiff";
                pdf.savetotiff(outputfilename);
                break;
            case "pdfa1a":
                outputfilename  = ".pdf";
                standardsconverter.topdfa1a(outputfilename);
                break;
            case "pdfa1b":
                outputfilename  = ".pdf";
                standardsconverter.topdfa1b(outputfilename);
                break;
            case "pdfa2a":
                outputfilename  = ".pdf";
                standardsconverter.topdfa2a(outputfilename);
                break;
            case "pdfa2b":
                outputfilename  = ".pdf";
                standardsconverter.topdfa2b(outputfilename);
                break;
            case "pdfa3a":
                outputfilename  = ".pdf";
                standardsconverter.topdfa3a(outputfilename);
                break;
            case "pdfa3b":
                outputfilename  = ".pdf";
                standardsconverter.topdfa3b(outputfilename);
                break;
        }
        pdf.close();
    }
}
                        

using spire.pdf;
using spire.pdf.conversion;
using spire.pdf.graphics;
using system;
using system.drawing;
using system.drawing.imaging;
namespace demoonlinecode
{
    class pdfconvertdemo
    {
        public void pdfconversions(string pdffile, string converttype)
        {
            string outputfilename = "output";
            pdfdocument pdf = new pdfdocument();
            pdf.loadfromfile(pdffile);
            pdfstandardsconverter standardsconverter = new pdfstandardsconverter(pdffile);
            switch (converttype)
            {
                case "docx":
                    outputfilename  = ".docx";
                    pdf.savetofile(outputfilename, fileformat.docx);
                    break;
                case "doc":
                    outputfilename  = ".doc";
                    pdf.savetofile(outputfilename, fileformat.doc);
                    break;
                case "xps":
                    outputfilename  = ".xps";
                    pdf.savetofile(outputfilename, fileformat.xps);
                    break;
                case "xlsx":
                    outputfilename  = ".xlsx";
                    pdf.savetofile(outputfilename, fileformat.xlsx);
                    break;
                case "postscript":
                    outputfilename  = ".ps";
                    pdf.savetofile(outputfilename, fileformat.postscript);
                    break;
                case "html":
                    outputfilename  = ".html";
                    pdf.convertoptions.setpdftohtmloptions(true, false, 1, false);
                    pdf.savetofile(outputfilename, fileformat.html);
                    break;
                case "image":
                    image image = null;
                    for (int i = 0; i < pdf.pages.count; i  )
                    {
                        image = pdf.saveasimage(i, pdfimagetype.bitmap);
                        image.save(outputfilename   i   ".png",imageformat.png);
                    }
                    break;
                case "svg":
                    outputfilename  = ".svg";
                    pdf.savetofile(outputfilename, fileformat.svg);
                    break;
                case "tiff":
                    outputfilename  = ".tiff";
                    jointiffimages(saveasimage(pdf), outputfilename, encodervalue.compressionlzw);
                    break;
                case "pdfa1a":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa1a(outputfilename);
                    break;
                case "pdfa1b":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa1b(outputfilename);
                    break;
                case "pdfa2a":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa2a(outputfilename);
                    break;
                case "pdfa2b":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa2b(outputfilename);
                    break;
                case "pdfa3a":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa3a(outputfilename);
                    break;
                case "pdfa3b":
                    outputfilename  = ".pdf";
                    standardsconverter.topdfa3b(outputfilename);
                    break;
            }
            pdf.close();
        }
        private static image[] saveasimage(pdfdocument document)
        {
            image[] images = new image[document.pages.count];
            for (int i = 0; i < document.pages.count; i  )
            {
                //use the document.saveasimage() method save the pdf as image
                images[i] = document.saveasimage(i);
            }
            return images;
        }
        private static imagecodecinfo getencoderinfo(string mimetype)
        {
            imagecodecinfo[] encoders = imagecodecinfo.getimageencoders();
            for (int j = 0; j < encoders.length; j  )
            {
                if (encoders[j].mimetype == mimetype)
                    return encoders[j];
            }
            throw new exception(mimetype   " mime type not found in imagecodecinfo");
        }
        public static void jointiffimages(image[] images, string outfile, encodervalue compressencoder)
        {
            //use the save encoder
            system.drawing.imaging.encoder enc = system.drawing.imaging.encoder.saveflag;
            encoderparameters ep = new encoderparameters(2);
            ep.param[0] = new encoderparameter(enc, (long)encodervalue.multiframe);
            ep.param[1] = new encoderparameter(system.drawing.imaging.encoder.compression, (long)compressencoder);
            image pages = images[0];
            int frame = 0;
            imagecodecinfo info = getencoderinfo("image/tiff");
            foreach (image img in images)
            {
                if (frame == 0)
                {
                    pages = img;
                    //save the first frame
                    pages.save(outfile, info, ep);
                }
                else
                {
                    //save the intermediate frames
                    ep.param[0] = new encoderparameter(enc, (long)encodervalue.framedimensionpage);
                    pages.saveadd(img, ep);
                }
                if (frame == images.length - 1)
                {
                    //flush and close.
                    ep.param[0] = new encoderparameter(enc, (long)encodervalue.flush);
                    pages.saveadd(ep);
                }
                frame  ;
            }
        }
    }
}