將文檔從一種格式轉換為另一種格式是Spire.DOC的主要功能之一。這種轉換只不過是加載和保存操作的組合。因此，使用Spire.DOC可以將文檔從任何受支持的加載格式轉換為任何受支持的保存格式。

本文整理了包括在Java中以下文件格式的轉換指南，希望對您有所幫助：

• 將Word轉換為圖像
  
• 將Word轉換為PDF
  
• 將HTML轉換為PDF
  

>>你可以點擊這里下載Spire.DOC for Java測試體驗。

將Word轉換為圖像

//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);
}

將Word轉換為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);
    }
}

將HTML轉換為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);
    }
}