从PDFBox中获取字体的颜色

Question

我想从PDFBox中获取字体颜色，并且我似乎一直在抛出异常。有人可以帮忙吗？我试图获得颜色的方法是（网页是我获得的PDPage）：

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()); 

这样就会打印出异常：

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

有人能告诉我如何正确获取的颜色以这种方式获得的字体？从源代码下载

Answer 1

尝试PrintTextColors：

/** 
* 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>"); 
    } 
}