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将文档从一种格式转换为另一种格式是Spire.DOC的主要功能之一。这种转换只不过是加载和保存操作的组合。因此，使用Spire.DOC可以将文档从任何受支持的加载格式转换为任何受支持的保存格式。

本文整理了包括在Java中以下文件格式的转换指南，希望对您有所帮助：

• 将Word转换为图像
  
• 将Word转换为PDF
  
• 将HTML转换为PDF
  

>>你可以点击这里下载Spire.DOC for Java测试体验。

将Word转换为图像

//create a Document object
Document doc = new Document();

//load a Word file
doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.docx");

//loop through the pages
for (int i = 0; i < doc.getPageCount(); i++) {

    //save the specific page to a BufferedImage
    BufferedImage image= doc.saveToImages(i, ImageType.Bitmap);

    //write the image data to a .png file
    File file = new File( "output/" + String.format(("Img-%d.png"), i));
    ImageIO.write(image, "PNG", file);
}

将Word转换为PDF

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.ToPdfParameterList;

public class WordToPDF {
    public static void main(String[] args)  {

        //Create Document object
        Document doc = new Document();

        //Load the file from disk.
        doc.loadFromFile("Sample.docx");

        //create an instance of ToPdfParameterList.
        ToPdfParameterList ppl=new ToPdfParameterList();

        //embeds full fonts by default when IsEmbeddedAllFonts is set to true.
        ppl.isEmbeddedAllFonts(true);

        //set setDisableLink to true to remove the hyperlink effect for the result PDF page.
        //set setDisableLink to false to preserve the hyperlink effect for the result PDF page.
        ppl.setDisableLink(true);

        //Set the output image quality as 40% of the original image. 80% is the default setting.
        doc.setJPEGQuality(40);

        //Save to file.
        doc.saveToFile("output/ToPDF.pdf",FileFormat.PDF);
    }
}

将HTML转换为PDF

import com.spire.doc.*;
import com.spire.doc.documents.XHTMLValidationType;

public class htmlFileToWord {

    public static void main(String[] args) throws Exception {
        // Load the sample HTML file
        Document document = new Document();
        document.loadFromFile("InputHtmlFile.html", FileFormat.Html, XHTMLValidationType.None);

        //Save to file
        document.saveToFile("Result.pdf",FileFormat.PDF);
    }
}