Java PDStream.getStream方法代码示例

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
private static void buildImgKeyToPolNameMapping(PDPage page) throws IOException {
    PDStream contents = page.getContents();
    PDFStreamParser parser = new PDFStreamParser(contents.getStream());
    parser.parse();
    List tokens = parser.getTokens();

    boolean concatStringPhase = false;
    String polName = "";
    String lastText = "";

    for (int index = 0; index < tokens.size(); index++) {
        Object obj = tokens.get(index);

        if (obj instanceof PDFOperator) {
            PDFOperator op = (PDFOperator) obj;
            if (op.getOperation().equals("BT")) {
                concatStringPhase = true;
                polName = lastText;
                lastText = "";
            }
            else if (op.getOperation().equals("ET")) {
                concatStringPhase = false;
            }
        }
        else if (concatStringPhase && obj instanceof COSString) {
            COSString cosString = (COSString) obj;
            lastText += " " + cosString.getString();
            lastText = lastText.trim();
        }
        else if (!concatStringPhase && obj instanceof COSName) {
            COSName cosName = (COSName) obj;
            if (cosName.getName().startsWith("img")) {
                mapImgKeyToPolName.put(cosName.getName(), polName);
            }
        }
    }
}
 

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
/**
 * This will process all of the pages and the text that is in them.
 *
 * @param pages The pages object in the document.
 *
 * @throws IOException If there is an error parsing the text.
 */
protected void processPages( List<COSObjectable> pages ) throws IOException
{
    if( startBookmark != null )
    {
        startBookmarkPageNumber = getPageNumber( startBookmark, pages );
    }
    if( endBookmark != null )
    {
        endBookmarkPageNumber = getPageNumber( endBookmark, pages );
    }

    if( startBookmarkPageNumber == -1 && startBookmark != null &&
            endBookmarkPageNumber == -1 && endBookmark != null &&
            startBookmark.getCOSObject() == endBookmark.getCOSObject() )
    {
        //this is a special case where both the start and end bookmark
        //are the same but point to nothing.  In this case
        //we will not extract any text.
        startBookmarkPageNumber = 0;
        endBookmarkPageNumber = 0;
    }
    Iterator<COSObjectable> pageIter = pages.iterator();
    while( pageIter.hasNext() )
    {
        PDPage nextPage = (PDPage)pageIter.next();
        PDStream contentStream = nextPage.getContents();
        currentPageNo++;
        if( contentStream != null )
        {
            COSStream contents = contentStream.getStream();
            processPage( nextPage, contents );
        }
    }
}
 

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
protected void processPages(List<COSObjectable> pages) throws IOException
{
    if (startBookmark != null)
    {
        startBookmarkPageNumber = getPageNumber(startBookmark, pages);
    }

    if (endBookmark != null)
    {
        endBookmarkPageNumber = getPageNumber(endBookmark, pages);
    }

    if (startBookmarkPageNumber == -1 && startBookmark != null &&
            endBookmarkPageNumber == -1 && endBookmark != null &&
            startBookmark.getCOSObject() == endBookmark.getCOSObject())
    {
        //this is a special case where both the start and end bookmark
        //are the same but point to nothing.  In this case
        //we will not extract any getText.
        startBookmarkPageNumber = 0;
        endBookmarkPageNumber = 0;
    }

    for (COSObjectable page : pages)
    {
        PDPage nextPage = (PDPage) page;
        PDStream contentStream = nextPage.getContents();
        currentPageNo++;
        if (contentStream != null)
        {
            COSStream contents = contentStream.getStream();
            processPage(nextPage, contents);
        }
    }
}
 

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
private static boolean hasText(PDPage page) throws IOException {

        PDStream contents = page.getContents();
        PDFStreamParser parser = new PDFStreamParser(contents.getStream());
        parser.parse();
        List tokens = parser.getTokens();

        for (Object next : tokens) {
            if (next instanceof PDFOperator) {
                PDFOperator op = (PDFOperator) next;

                if (op.getOperation().equalsIgnoreCase(Consts.PDFMetadata.TEXT_OPERATOR)) {
                    return true;
                }
            }
        }
        return false;
    }
 

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
/**
 * <a href="http://stackoverflow.com/questions/29220165/editing-content-in-pdf-using-pdfbox-removes-last-line-from-pdf">
 * Editing content in pdf using PDFBox removes last line from pdf
 * </a>
 * 
 * Reproducing the issue.
 */
@Test
public void testDrunkenfistOriginal() throws IOException, COSVisitorException
{
    try (   InputStream originalStream = getClass().getResourceAsStream("Original.pdf") )
    {
        PDDocument doc = PDDocument.load(originalStream);
        PDPage page = (PDPage) doc.getDocumentCatalog().getAllPages().get(0);
        PDStream contents = page.getContents();
        PDFStreamParser parser = new PDFStreamParser(contents.getStream());
        parser.parse();
        List<Object> tokens = parser.getTokens();
        for (int j = 0; j < tokens.size(); j++) {
            Object next = tokens.get(j);
            if (next instanceof PDFOperator) {
                PDFOperator op = (PDFOperator) next;
                if (op.getOperation().equals("Tj")) {
                    COSString previous = (COSString) tokens.get(j - 1);
                    String string = previous.getString();

                    string = string.replace("@ordnum&", "-ORDERNR-");
                    string = string.replace("@shipid&", "-SHIPMENTID-");
                    string = string.replace("@customer&", "-CUSTOMERNR-");
                    string = string.replace("@fromname&", "-FROMNAME-");

                    tokens.set(j - 1, new COSString(string.trim()));
                }
            }
        }

        PDStream updatedStream = new PDStream(doc);  
        OutputStream out = updatedStream.createOutputStream();  
        ContentStreamWriter tokenWriter = new ContentStreamWriter(out);  
        tokenWriter.writeTokens(tokens);  
        page.setContents(updatedStream);
        
        doc.save(new File(RESULT_FOLDER, "Original-edited.pdf"));
        doc.close();
    }
}
 

import org.apache.pdfbox.pdmodel.common.PDStream; //导入方法依赖的package包/类
/**
 * This document removes all blue filled rectangles. As the sample document
 * only uses RGB colors, actually only uses "rg" to set the blue fill color,
 * the code could be somewhat simplified.
 */
void removeBlueRectangles(PDDocument document) throws IOException
{
    List<?> pages = document.getDocumentCatalog().getAllPages();
    for (int i = 0; i < pages.size(); i++)
    {
        PDPage page = (PDPage) pages.get(i);
        PDStream contents = page.getContents();

        PDFStreamParser parser = new PDFStreamParser(contents.getStream()); 
        parser.parse();
        List<Object> tokens = parser.getTokens();  

        Stack<Boolean> blueState = new Stack<Boolean>();
        blueState.push(false);

        for (int j = 0; j < tokens.size(); j++)  
        {  
            Object next = tokens.get(j);
            if (next instanceof PDFOperator)
            {
                PDFOperator op = (PDFOperator) next;  
                if (op.getOperation().equals("q"))
                {
                    blueState.push(blueState.peek());
                }
                else if (op.getOperation().equals("Q"))
                {
                    blueState.pop();
                }
                else if (op.getOperation().equals("rg"))
                {
                    if (j > 2)
                    {
                        Object r = tokens.get(j-3);
                        Object g = tokens.get(j-2);
                        Object b = tokens.get(j-1);
                        if (r instanceof COSNumber && g instanceof COSNumber && b instanceof COSNumber)
                        {
                            blueState.pop();
                            blueState.push((
                                    Math.abs(((COSNumber)r).floatValue() - 0) < 0.001 &&
                                    Math.abs(((COSNumber)g).floatValue() - 0) < 0.001 &&
                                    Math.abs(((COSNumber)b).floatValue() - 1) < 0.001));
                        }
                    }
                }
                else if (op.getOperation().equals("f"))
                {
                    if (blueState.peek() && j > 0)
                    {
                        Object re = tokens.get(j-1);
                        if (re instanceof PDFOperator && ((PDFOperator)re).getOperation().equals("re"))
                        {
                            tokens.set(j, PDFOperator.getOperator("n"));
                        }
                    }
                }
            }
        }

        PDStream updatedStream = new PDStream(document);  
        OutputStream out = updatedStream.createOutputStream();  
        ContentStreamWriter tokenWriter = new ContentStreamWriter(out);  
        tokenWriter.writeTokens(tokens);  
        page.setContents(updatedStream);
    }
}