pdfwriter.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

    protected PdfContentByte directContentUnder;
    
    /**
     * Use this method to get the direct content for this document.
     * There is only one direct content, multiple calls to this method
     * will allways retrieve the same object.
     * @return the direct content
     */
    
    public PdfContentByte getDirectContent() {
        if (!open)
            throw new RuntimeException("The document is not open.");
        return directContent;
    }
    
    /**
     * Use this method to get the direct content under for this document.
     * There is only one direct content, multiple calls to this method
     * will allways retrieve the same object.
     * @return the direct content
     */
    
    public PdfContentByte getDirectContentUnder() {
        if (!open)
            throw new RuntimeException("The document is not open.");
        return directContentUnder;
    }
    
    /**
     * Resets all the direct contents to empty.
     * This happens when a new page is started.
     */
    void resetContent() {
        directContent.reset();
        directContentUnder.reset();
    }
    
//	PDF body
    
/*
 * A PDF file has 4 parts: a header, a body, a cross-reference table, and a trailer.
 * The body contains all the PDF objects that make up the PDF document.
 * Each element gets a reference (a set of numbers) and the byte position of
 * every object is stored in the cross-reference table.
 * Use these methods only if you know what you're doing.
 */
    
    /** body of the PDF document */
    protected PdfBody body;
    
    /**
     * Adds the local destinations to the body of the document.
     * @param dest the <CODE>HashMap</CODE> containing the destinations
     * @throws IOException on error
     */
    
    void addLocalDestinations(TreeMap dest) throws IOException {
        for (Iterator i = dest.entrySet().iterator(); i.hasNext();) {
            Map.Entry entry = (Map.Entry) i.next();
            String name = (String) entry.getKey();
            Object obj[] = (Object[]) entry.getValue();
            PdfDestination destination = (PdfDestination)obj[2];
            if (destination == null)
                throw new RuntimeException("The name '" + name + "' has no local destination.");
            if (obj[1] == null)
                obj[1] = getPdfIndirectReference();
            addToBody(destination, (PdfIndirectReference)obj[1]);
        }
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object) throws IOException {
        PdfIndirectObject iobj = body.add(object);
        return iobj;
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @param inObjStm
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object, boolean inObjStm) throws IOException {
        PdfIndirectObject iobj = body.add(object, inObjStm);
        return iobj;
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @param ref
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object, PdfIndirectReference ref) throws IOException {
        PdfIndirectObject iobj = body.add(object, ref);
        return iobj;
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @param ref
     * @param inObjStm
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object, PdfIndirectReference ref, boolean inObjStm) throws IOException {
        PdfIndirectObject iobj = body.add(object, ref, inObjStm);
        return iobj;
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @param refNumber
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object, int refNumber) throws IOException {
        PdfIndirectObject iobj = body.add(object, refNumber);
        return iobj;
    }
    
    /**
     * Use this method to add a PDF object to the PDF body.
     * Use this method only if you know what you're doing!
     * @param object
     * @param refNumber
     * @param inObjStm
     * @return a PdfIndirectObject
     * @throws IOException
     */
    public PdfIndirectObject addToBody(PdfObject object, int refNumber, boolean inObjStm) throws IOException {
        PdfIndirectObject iobj = body.add(object, refNumber, inObjStm);
        return iobj;
    }
    
    /**
     * Use this to get an <CODE>PdfIndirectReference</CODE> for an object that
     * will be created in the future.
     * Use this method only if you know what you're doing!
     * @return the <CODE>PdfIndirectReference</CODE>
     */
    
    public PdfIndirectReference getPdfIndirectReference() {
        return body.getPdfIndirectReference();
    }
    
    int getIndirectReferenceNumber() {
        return body.getIndirectReferenceNumber();
    }
    
    /**
     * Returns the outputStreamCounter.
     * @return the outputStreamCounter
     */
    OutputStreamCounter getOs() {
        return os;
    }


//	PDF Catalog
    
/*
 * The Catalog is also called the root object of the document.
 * Whereas the Cross-Reference maps the objects number with the
 * byte offset so that the viewer can find the objects, the
 * Catalog tells the viewer the numbers of the objects needed
 * to render the document.
 */
    
    protected PdfDictionary getCatalog(PdfIndirectReference rootObj)
    {
        PdfDictionary catalog = pdf.getCatalog(rootObj);
        // [F12] tagged PDF
        if (tagged) {
            try {
                getStructureTreeRoot().buildTree();
            }
            catch (Exception e) {
                throw new ExceptionConverter(e);
            }
            catalog.put(PdfName.STRUCTTREEROOT, structureTreeRoot.getReference());
            PdfDictionary mi = new PdfDictionary();
            mi.put(PdfName.MARKED, PdfBoolean.PDFTRUE);
            if (userProperties)
                mi.put(PdfName.USERPROPERTIES, PdfBoolean.PDFTRUE);
            catalog.put(PdfName.MARKINFO, mi);
        }
        // [F13] OCG
        if (!documentOCG.isEmpty()) {
        	fillOCProperties(false);
        	catalog.put(PdfName.OCPROPERTIES, OCProperties);
        }
        return catalog;
    }
    
    /** Holds value of property extraCatalog this is used for Output Intents. */
    protected PdfDictionary extraCatalog;
    
    /**
     * Sets extra keys to the catalog.
     * @return the catalog to change
     */    
    public PdfDictionary getExtraCatalog() {
        if (extraCatalog == null)
            extraCatalog = new PdfDictionary();
        return this.extraCatalog;
    }
    
//	PdfPages
    
/*
 * The page root keeps the complete page tree of the document.
 * There's an entry in the Catalog that refers to the root
 * of the page tree, the page tree contains the references
 * to pages and other page trees.
 */
    
    /** The root of the page tree. */
    protected PdfPages root = new PdfPages(this);
    /** The PdfIndirectReference to the pages. */
    protected ArrayList pageReferences = new ArrayList();
    /** The current page number. */
    protected int currentPageNumber = 1;

    /**
     * Use this method to make sure the page tree has a lineair structure
     * (every leave is attached directly to the root).
     * Use this method to allow page reordering with method reorderPages.
     */    
     public void setLinearPageMode() {
        root.setLinearMode(null);
    }
     
    /**
     * Use this method to reorder the pages in the document.
     * A <CODE>null</CODE> argument value only returns the number of pages to process.
     * It is advisable to issue a <CODE>Document.newPage()</CODE> before using this method.
     * @return the total number of pages
     * @param order an array with the new page sequence. It must have the
     * same size as the number of pages.
     * @throws DocumentException if all the pages are not present in the array
     */
    public int reorderPages(int order[]) throws DocumentException {
        return root.reorderPages(order);
    }
    
    /**
     * Use this method to get a reference to a page existing or not.
     * If the page does not exist yet the reference will be created
     * in advance. If on closing the document, a page number greater
     * than the total number of pages was requested, an exception
     * is thrown.
     * @param page the page number. The first page is 1
     * @return the reference to the page
     */
    public PdfIndirectReference getPageReference(int page) {
        --page;
        if (page < 0)
            throw new IndexOutOfBoundsException("The page numbers start at 1.");
        PdfIndirectReference ref;
        if (page < pageReferences.size()) {
            ref = (PdfIndirectReference)pageReferences.get(page);
            if (ref == null) {
                ref = body.getPdfIndirectReference();
                pageReferences.set(page, ref);
            }
        }
        else {
            int empty = page - pageReferences.size();
            for (int k = 0; k < empty; ++k)
                pageReferences.add(null);
            ref = body.getPdfIndirectReference();
            pageReferences.add(ref);
        }
        return ref;
    }
    
    /**
     * Gets the pagenumber of this document.
     * This number can be different from the real pagenumber,
     * if you have (re)set the page number previously.
     * @return a page number
     */
    
    public int getPageNumber() {
        return pdf.getPageNumber();
    }
    
    PdfIndirectReference getCurrentPage() {
        return getPageReference(currentPageNumber);
    }
    
    public int getCurrentPageNumber() {
        return currentPageNumber;
    }
    
    /**
     * Adds some <CODE>PdfContents</CODE> to this Writer.
     * <P>
     * The document has to be open before you can begin to add content
     * to the body of the document.
     *
     * @return a <CODE>PdfIndirectReference</CODE>
     * @param page the <CODE>PdfPage</CODE> to add
     * @param contents the <CODE>PdfContents</CODE> of the page
     * @throws PdfException on error
     */
    
    PdfIndirectReference add(PdfPage page, PdfContents contents) throws PdfException {
        if (!open) {
            throw new PdfException("The document isn't open.");
        }
        PdfIndirectObject object;
        try {
            object = addToBody(contents);
        }
        catch(IOException ioe) {
            throw new ExceptionConverter(ioe);
        }
        page.add(object.getIndirectReference());
        // [U5]
        if (group != null) {
            page.put(PdfName.GROUP, group);
            group = null;
        }
        root.addPage(page);
        currentPageNumber++;