从PDFBox中的字体获取颜色 [英] Get colours from fonts in PDFBox

问题描述

我试图从PDFBox中获取字体颜色，我似乎一直在抛出一个异常。有人可以帮忙吗？我尝试获取颜色的方式是（页面是我得到的PDPage）：

pre preResources = page.getResources（）;
可重用< COSName> fontNames = resources.getFontNames（）; （COSName fontName：fontNames）

System.out.println（name：+ resources.getFont（fontName）.getName（）+
color：+ resources.getColorSpace（的fontName）.getName（））;

这会打印出异常：

  org.apache.pdfbox.pdmodel.MissingResourceException：缺少色彩空间：F1 
  

有人可以告诉我如何正确地获得以这种方式获得的字体的颜色吗？

解决方案

试试PrintTextColors源代码下载：

  / ** 
 *这是一个如何获取文本颜色的例子。请注意，这将不会告诉背景
 *，并且只有当文本稍后不被覆盖，并且仅当文本渲染
 *模式为0,1或2时，才会正常工作。在PDF 32000规范，请阅读9.3.6文本渲染模式至
 *了解更多。模式0（FILL）是默认值。模式1（STROKE）将使字形看起来空洞。模式2 
 *（FILL_STROKE）会使字形显得肥胖。 
 * 
 * @author Ben Litchfield 
 * @author Tilman Hausherr 
 * / 
 public class PrintTextColors extends PDFTextStripper 
 {
 / ** 
 *实例化一个新的PDFTextStripper对象。 
 * 
 * @throws IOException如果加载属性时出错。 
 * / 
 public PrintTextColors（）throws IOException 
 {
 addOperator（new SetStrokingColorSpace（））; 
 addOperator（新的SetNonStrokingColorSpace（））; 
 addOperator（new SetStrokingDeviceCMYKColor（））; 
 addOperator（new SetNonStrokingDeviceCMYKColor（））; 
 addOperator（new SetNonStrokingDeviceRGBColor（））; 
 addOperator（new SetStrokingDeviceRGBColor（））; 
 addOperator（new SetNonStrokingDeviceGrayColor（））; 
 addOperator（new SetStrokingDeviceGrayColor（））; 
 addOperator（new SetStrokingColor（））; 
 addOperator（new SetStrokingColorN（））; 
 addOperator（new SetNonStrokingColor（））; 
 addOperator（new SetNonStrokingColorN（））; 
} 
 
 / ** 
 *这将打印文档数据。 
 * 
 * @param args命令行参数。 
 * 
 * @throws IOException如果解析文档时出错。 
 * / 
 public static void main（String [] args）throws IOException 
 {
 if（args.length！= 1）
 {
 usage （）; 
} 
 else 
 {
 PDDocument document = null; 
尝试
 {
 document = PDDocument.load（new File（args [0]））; 
 
 PDFTextStripper stripper = new PrintTextColors（）; 
 stripper.setSortByPosition（true）; 
 stripper.setStartPage（0）; 
 stripper.setEndPage（document.getNumberOfPages（））; 
 
 Writer dummy = new OutputStreamWriter（new ByteArrayOutputStream（））; 
 stripper.writeText（document，dummy）; 
 
 finally 
 
 if（document！= null）
 {
 document.close（）; 
 
 
 
 
 $ @覆盖
保护无效processTextPosition（TextPosition文本）
 {
 super.processTextPosition（文本）; 
 
 PDColor strokingColor = getGraphicsState（）。getStrokingColor（）; 
 PDColor nonStrokingColor = getGraphicsState（）。getNonStrokingColor（）; 
 String unicode = text.getUnicode（）; 
 RenderingMode renderingMode = getGraphicsState（）。getTextState（）。getRenderingMode（）; 
 System.out.println（Unicode：+ unicode）; 
 System.out.println（Rendering mode：+ renderingMode）; 
 System.out.println（抚摸颜色：+ strokingColor）; 
 System.out.println（Non-Stroking color：+ nonStrokingColor）; 
 System.out.println（Non-Stroking color：+ nonStrokingColor）; 
 System.out.println（）; 
 
 //查看PrintTextLocations获取更多属性
 
 $ b $ ** 
 *这将打印这个文档的用法。 
 
 private static void use（）
 {
 System.err.println（Usage：java+ PrintTextColors.class.getName（）+< input- PDF>中）; 
} 
} 
  

I am trying to get the font colour from PDFBox and I seem to keep throwing an exception. Can someone help? The way I tried to obtain the colour was (page is the PDPage I obtained):

PDResources = page.getResources();
Iterable<COSName> fontNames = resources.getFontNames();
for (COSName fontName:fontNames)
   System.out.println("name: " + resources.getFont(fontName).getName() + 
                      "colour: " + resources.getColorSpace(fontName).getName());

This prints out the exception:

org.apache.pdfbox.pdmodel.MissingResourceException: Missing color space: F1

Could someone tell me how to properly get the colour of a font obtained in this manner?

解决方案

Try PrintTextColors from the source code download:

/**
 * This is an example on how to get the colors of text. Note that this will not tell the background,
 * and will only work properly if the text is not overwritten later, and only if the text rendering
 * modes are 0, 1 or 2. In the PDF 32000 specification, please read 9.3.6 "Text Rendering Mode" to
 * know more. Mode 0 (FILL) is the default. Mode 1 (STROKE) will make glyphs look "hollow". Mode 2
 * (FILL_STROKE) will make glyphs look "fat".
 *
 * @author Ben Litchfield
 * @author Tilman Hausherr
 */
public class PrintTextColors extends PDFTextStripper
{
    /**
     * Instantiate a new PDFTextStripper object.
     *
     * @throws IOException If there is an error loading the properties.
     */
    public PrintTextColors() throws IOException
    {
        addOperator(new SetStrokingColorSpace());
        addOperator(new SetNonStrokingColorSpace());
        addOperator(new SetStrokingDeviceCMYKColor());
        addOperator(new SetNonStrokingDeviceCMYKColor());
        addOperator(new SetNonStrokingDeviceRGBColor());
        addOperator(new SetStrokingDeviceRGBColor());
        addOperator(new SetNonStrokingDeviceGrayColor());
        addOperator(new SetStrokingDeviceGrayColor());
        addOperator(new SetStrokingColor());
        addOperator(new SetStrokingColorN());
        addOperator(new SetNonStrokingColor());
        addOperator(new SetNonStrokingColorN());
    }

    /**
     * This will print the documents data.
     *
     * @param args The command line arguments.
     *
     * @throws IOException If there is an error parsing the document.
     */
    public static void main(String[] args) throws IOException
    {
        if (args.length != 1)
        {
            usage();
        }
        else
        {
            PDDocument document = null;
            try
            {
                document = PDDocument.load(new File(args[0]));

                PDFTextStripper stripper = new PrintTextColors();
                stripper.setSortByPosition(true);
                stripper.setStartPage(0);
                stripper.setEndPage(document.getNumberOfPages());

                Writer dummy = new OutputStreamWriter(new ByteArrayOutputStream());
                stripper.writeText(document, dummy);
            }
            finally
            {
                if (document != null)
                {
                    document.close();
                }
            }
        }
    }

    @Override
    protected void processTextPosition(TextPosition text)
    {
        super.processTextPosition(text);

        PDColor strokingColor = getGraphicsState().getStrokingColor();
        PDColor nonStrokingColor = getGraphicsState().getNonStrokingColor();
        String unicode = text.getUnicode();
        RenderingMode renderingMode = getGraphicsState().getTextState().getRenderingMode();
        System.out.println("Unicode:            " + unicode);
        System.out.println("Rendering mode:     " + renderingMode);
        System.out.println("Stroking color:     " + strokingColor);
        System.out.println("Non-Stroking color: " + nonStrokingColor);
        System.out.println("Non-Stroking color: " + nonStrokingColor);
        System.out.println();

        // See the PrintTextLocations for more attributes
    }

    /**
     * This will print the usage for this document.
     */
    private static void usage()
    {
        System.err.println("Usage: java " + PrintTextColors.class.getName() + " <input-pdf>");
    }
}

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