2020国产工具Spire.PDF 在Java中进行各种格式转换全新攻略

Spire系列文档处理API是国产开发工具中功能可媲美Aspose的强大控件，帮助开发者轻松将文档功能集成到应用程序中。年终福利，小编为您倾情献上Spire.PDF在Java中格式转换的示例教程，记得收藏哦！

将文档从一种格式转换为另一种格式是Spire.PDF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.PDF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。

• PDF转换为图像以及图像转换为PDF
• 将PDF转换为PDF / A
• 将PDF转换Word
• 将PDF转换为HTML以及HTML转换为PDF
• 将PDF转换为SVG
• 将PDF转换为XPS并将XPS转换为PDF
• 将PDF转换为Excel

>>你可以点击这里下载Spire.PDF for Java测试体验。

（篇幅较长，建议收藏阅读）

PDF转换为图像以及图像转换为PDF

import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import com.spire.pdf.PdfDocument;import javax.imageio.ImageIO;public class toImage {        public static void main(String[] args) throws IOException {            //load the sample PDF            PdfDocument doc = new PdfDocument();            doc.loadFromFile("Sample.pdf");            //save every PDF to .png image            BufferedImage image;            for (int i = 0; i < doc.getPages().getCount(); i++) { image = doc.saveAsImage(i); File file = new File( String.format("ToImage-img-%d.png", i)); ImageIO.write(image, "PNG", file); } doc.close(); } }

import com.spire.pdf.PdfDocument;import com.spire.pdf.PdfPageBase;import com.spire.pdf.graphics.PdfImage;public class ImageToPDF {    public static void main(String[] args){        //Create a PdfDocument instance        PdfDocument pdf = new PdfDocument();        //Add a page        PdfPageBase page = pdf.getPages().add();        //Load the image        PdfImage image = PdfImage.fromFile("Hydrangeas.jpg");        //Draw the image to the specific rectangular area of the page        double widthFitRate = image.getPhysicalDimension().getWidth() / page.getCanvas().getClientSize().getWidth();        double heightFitRate = image.getPhysicalDimension().getHeight() / page.getCanvas().getClientSize().getHeight();        double fitRate = Math.max(widthFitRate, heightFitRate);        double fitWidth = image.getPhysicalDimension().getWidth() / fitRate;        double fitHeight = image.getPhysicalDimension().getHeight() / fitRate;        page.getCanvas().drawImage(image, new Rectangle2D.Double(0, 0, fitWidth, fitHeight));        //Save the resultant document        pdf.saveToFile("ConvertImageToPDF.pdf");    }}

将PDF转换为PDF / A

import com.spire.pdf.PdfConformanceLevel;import com.spire.pdf.PdfDocument;import com.spire.pdf.PdfNewDocument;import com.spire.pdf.PdfPageBase;import com.spire.pdf.graphics.PdfMargins;import java.awt.geom.Dimension2D;public class PDFToPDFA {    public static void main(String[] args)    {        //Load pdf file        PdfDocument document = new PdfDocument();        document.loadFromFile("Sales Report.pdf");        //Convert to Pdf_A_1_B        PdfNewDocument newDoc = new PdfNewDocument();        newDoc.setConformance(PdfConformanceLevel.Pdf_A_1_B);        for (PdfPageBase page : (Iterable) document.getPages()) {            Dimension2D size = page.getSize();            PdfPageBase p = newDoc.getPages().add(size, new PdfMargins(0));            page.createTemplate().draw(p, 0, 0);        }        //Save the file        newDoc.save("Output.pdf");        newDoc.close();    }}

将PDF转换Word

import com.spire.pdf.*;public class PdfToDoc {    public static void main(String[] args) {        //create a PdfDocument object        PdfDocument doc = new PdfDocument();        //load a sample PDF file        doc.loadFromFile("C:\Users\Administrator\Desktop\Introduction of Spire.PDF for Java.pdf");        //save as .doc file        doc.saveToFile("output/ToDoc.doc",FileFormat.DOC);        //save as. docx file        doc.saveToFile("output/ToDocx.docx",FileFormat.DOCX);        doc.close();    }}

将PDF转换为HTML以及HTML转换为PDF

import com.spire.pdf.*;public class PDFConversion {    public static void main(String[] args) {        //Load the PDF file        PdfDocument pdf = new PdfDocument();        pdf.loadFromFile("New Zealand.pdf");        //Save to HTML format        pdf.saveToFile("ToHTML.html", FileFormat.HTML);    }}

import com.spire.pdf.graphics.PdfMargins;import com.spire.pdf.htmlconverter.qt.HtmlConverter;import com.spire.pdf.htmlconverter.qt.Size;public class HtmltoPDF {    public static void main(String[] args) {        //define the HTML link and result PDF        String url = "https://www.e-iceblue.com/";        String fileName = "Result.pdf";        //Set the plugin path        String pluginPath = "D:/Qt/plugins_32";        HtmlConverter.setPluginPath(pluginPath);        //convert HTML to PDF and set the size of the result PDF page        HtmlConverter.convert(url, fileName, true, 1000000, new Size(600f, 900f), new PdfMargins(0));    }}

将PDF转换为HTML以及HTML转换为PDF

import com.spire.pdf.*;public class PDFConversion {    public static void main(String[] args) {        //Load the PDF file        PdfDocument pdf = new PdfDocument();        pdf.loadFromFile("Input.pdf");        //Save to SVG image        pdf.saveToFile("ToSVG.svg", FileFormat.SVG);        pdf.close();    }}

将PDF转换为XPS并将XPS转换为PDF

import com.spire.pdf.*;public class PDFtoXPS {    public static void main(String[] args) {        //Load the PDF file        PdfDocument pdf = new PdfDocument();        pdf.loadFromFile("Sample.pdf");       //Save to XPS        pdf.saveToFile("ToXPS.xps", FileFormat.XPS);    }}

import com.spire.pdf.*;public class PDFtoXPS {    public static void main(String[] args) {        //Load XPS        PdfDocument pdf = new PdfDocument();        pdf.loadFromXPS("ToXPS.xps");        //Save to PDF        pdf.saveToFile("toPDF.pdf", FileFormat.PDF);    }}

将PDF转换为Excel

import com.spire.pdf.FileFormat;import com.spire.pdf.PdfDocument;public class ToXLS {    public static void main(String[] args) {        //Create a PdfDocument object        PdfDocument pdf = new PdfDocument();        //Load a sample PDF file        pdf.loadFromFile("C:\Users\Test1\Desktop\Sample.pdf");        //Save to Excel        pdf.saveToFile("output/ToXLS.xlsx", FileFormat.XLSX);    }}

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