acrofields.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

                                if (fn != null) {
                                    try {
                                        String enc = "winansi";
                                        if (fn.length > 1)
                                            enc = fn[1];
                                        bf = BaseFont.createFont(fn[0], enc, false);
                                        tx.setFont(bf);
                                    }
                                    catch (Exception e) {
                                        // empty
                                    }
                                }
                            }
                            else
                                tx.setFont(bf);
                        }
                    }
                }
            }
        }
        //rotation, border and backgound color
        PdfDictionary mk = (PdfDictionary)PdfReader.getPdfObject(merged.get(PdfName.MK));
        if (mk != null) {
            PdfArray ar = (PdfArray)PdfReader.getPdfObject(mk.get(PdfName.BC));
            Color border = getMKColor(ar);
            tx.setBorderColor(border);
            if (border != null)
                tx.setBorderWidth(1);
            ar = (PdfArray)PdfReader.getPdfObject(mk.get(PdfName.BG));
            tx.setBackgroundColor(getMKColor(ar));
            PdfNumber rotation = (PdfNumber)PdfReader.getPdfObject(mk.get(PdfName.R));
            if (rotation != null)
                tx.setRotation(rotation.intValue());
        }
        //flags
        PdfNumber nfl = (PdfNumber)PdfReader.getPdfObject(merged.get(PdfName.F));
        flags = 0;
        if (nfl != null) {
            flags = nfl.intValue();
            if ((flags & PdfFormField.FLAGS_PRINT) != 0 && (flags & PdfFormField.FLAGS_HIDDEN) != 0)
                tx.setVisibility(BaseField.HIDDEN);
            else if ((flags & PdfFormField.FLAGS_PRINT) != 0 && (flags & PdfFormField.FLAGS_NOVIEW) != 0)
                tx.setVisibility(BaseField.HIDDEN_BUT_PRINTABLE);
            else if ((flags & PdfFormField.FLAGS_PRINT) != 0)
                tx.setVisibility(BaseField.VISIBLE);
            else
                tx.setVisibility(BaseField.VISIBLE_BUT_DOES_NOT_PRINT);
        }
        //multiline
        nfl = (PdfNumber)PdfReader.getPdfObject(merged.get(PdfName.FF));
        flags = 0;
        if (nfl != null)
            flags = nfl.intValue();
        tx.setOptions(flags);
        if ((flags & PdfFormField.FF_COMB) != 0) {
            PdfNumber maxLen = (PdfNumber)PdfReader.getPdfObject(merged.get(PdfName.MAXLEN));
            int len = 0;
            if (maxLen != null)
                len = maxLen.intValue();
            tx.setMaxCharacterLength(len);
        }
        //alignment
        nfl = (PdfNumber)PdfReader.getPdfObject(merged.get(PdfName.Q));
        if (nfl != null) {
            if (nfl.intValue() == PdfFormField.Q_CENTER)
                tx.setAlignment(Element.ALIGN_CENTER);
            else if (nfl.intValue() == PdfFormField.Q_RIGHT)
                tx.setAlignment(Element.ALIGN_RIGHT);
        }
        //border styles
        PdfDictionary bs = (PdfDictionary)PdfReader.getPdfObject(merged.get(PdfName.BS));
        if (bs != null) {
            PdfNumber w = (PdfNumber)PdfReader.getPdfObject(bs.get(PdfName.W));
            if (w != null)
                tx.setBorderWidth(w.floatValue());
            PdfName s = (PdfName)PdfReader.getPdfObject(bs.get(PdfName.S));
            if (PdfName.D.equals(s))
                tx.setBorderStyle(PdfBorderDictionary.STYLE_DASHED);
            else if (PdfName.B.equals(s))
                tx.setBorderStyle(PdfBorderDictionary.STYLE_BEVELED);
            else if (PdfName.I.equals(s))
                tx.setBorderStyle(PdfBorderDictionary.STYLE_INSET);
            else if (PdfName.U.equals(s))
                tx.setBorderStyle(PdfBorderDictionary.STYLE_UNDERLINE);
        }
        else {
            PdfArray bd = (PdfArray)PdfReader.getPdfObject(merged.get(PdfName.BORDER));
            if (bd != null) {
                ArrayList ar = bd.getArrayList();
                if (ar.size() >= 3)
                    tx.setBorderWidth(((PdfNumber)ar.get(2)).floatValue());
                if (ar.size() >= 4)
                    tx.setBorderStyle(PdfBorderDictionary.STYLE_DASHED);
            }
        }
    }
    
    PdfAppearance getAppearance(PdfDictionary merged, String text, String fieldName) throws IOException, DocumentException {
        topFirst = 0;
        TextField tx = null;
        if (fieldCache == null || !fieldCache.containsKey(fieldName)) {
            tx = new TextField(writer, null, null);
            tx.setExtraMargin(extraMarginLeft, extraMarginTop);
            tx.setBorderWidth(0);
            tx.setSubstitutionFonts(substitutionFonts);
            decodeGenericDictionary(merged, tx);
            //rect
            PdfArray rect = (PdfArray)PdfReader.getPdfObject(merged.get(PdfName.RECT));
            Rectangle box = PdfReader.getNormalizedRectangle(rect);
            if (tx.getRotation() == 90 || tx.getRotation() == 270)
                box = box.rotate();
            tx.setBox(box);
            if (fieldCache != null)
                fieldCache.put(fieldName, tx);
        }
        else {
            tx = (TextField)fieldCache.get(fieldName);
            tx.setWriter(writer);
        }
        PdfName fieldType = (PdfName)PdfReader.getPdfObject(merged.get(PdfName.FT));
        if (PdfName.TX.equals(fieldType)) {
            tx.setText(text);
            return tx.getAppearance();
        }
        if (!PdfName.CH.equals(fieldType))
            throw new DocumentException("An appearance was requested without a variable text field.");
        PdfArray opt = (PdfArray)PdfReader.getPdfObject(merged.get(PdfName.OPT));
        int flags = 0;
        PdfNumber nfl = (PdfNumber)PdfReader.getPdfObject(merged.get(PdfName.FF));
        if (nfl != null)
            flags = nfl.intValue();
        if ((flags & PdfFormField.FF_COMBO) != 0 && opt == null) {
            tx.setText(text);
            return tx.getAppearance();
        }
        if (opt != null) {
            ArrayList op = opt.getArrayList();
            String choices[] = new String[op.size()];
            String choicesExp[] = new String[op.size()];
            for (int k = 0; k < op.size(); ++k) {
                PdfObject obj = (PdfObject)op.get(k);
                if (obj.isString()) {
                    choices[k] = choicesExp[k] = ((PdfString)obj).toUnicodeString();
                }
                else {
                    ArrayList opar = ((PdfArray)obj).getArrayList();
                    choicesExp[k] = ((PdfString)opar.get(0)).toUnicodeString();
                    choices[k] = ((PdfString)opar.get(1)).toUnicodeString();
                }
            }
            if ((flags & PdfFormField.FF_COMBO) != 0) {
                for (int k = 0; k < choices.length; ++k) {
                    if (text.equals(choicesExp[k])) {
                        text = choices[k];
                        break;
                    }
                }
                tx.setText(text);
                return tx.getAppearance();
            }
            int idx = 0;
            for (int k = 0; k < choicesExp.length; ++k) {
                if (text.equals(choicesExp[k])) {
                    idx = k;
                    break;
                }
            }
            tx.setChoices(choices);
            tx.setChoiceExports(choicesExp);
            tx.setChoiceSelection(idx);
        }
        PdfAppearance app = tx.getListAppearance();
        topFirst = tx.getTopFirst();
        return app;
    }
    
    Color getMKColor(PdfArray ar) {
        if (ar == null)
            return null;
        ArrayList cc = ar.getArrayList();
        switch (cc.size()) {
            case 1:
                return new GrayColor(((PdfNumber)cc.get(0)).floatValue());
            case 3:
                return new Color(ExtendedColor.normalize(((PdfNumber)cc.get(0)).floatValue()), ExtendedColor.normalize(((PdfNumber)cc.get(1)).floatValue()), ExtendedColor.normalize(((PdfNumber)cc.get(2)).floatValue()));
            case 4:
                return new CMYKColor(((PdfNumber)cc.get(0)).floatValue(), ((PdfNumber)cc.get(1)).floatValue(), ((PdfNumber)cc.get(2)).floatValue(), ((PdfNumber)cc.get(3)).floatValue());
            default:
                return null;
        }
    }
    
    /** Gets the field value.
     * @param name the fully qualified field name
     * @return the field value
     */    
    public String getField(String name) {
        if (xfa.isXfaPresent()) {
            name = xfa.findFieldName(name, this);
            if (name == null)
                return null;
            name = XfaForm.Xml2Som.getShortName(name);
            return XfaForm.getNodeText(xfa.findDatasetsNode(name));
        }
        Item item = (Item)fields.get(name);
        if (item == null)
            return null;
        lastWasString = false;
        PdfObject v = PdfReader.getPdfObject(((PdfDictionary)item.merged.get(0)).get(PdfName.V));
        if (v == null)
            return "";
        PdfName type = (PdfName)PdfReader.getPdfObject(((PdfDictionary)item.merged.get(0)).get(PdfName.FT));
        if (PdfName.BTN.equals(type)) {
            PdfNumber ff = (PdfNumber)PdfReader.getPdfObject(((PdfDictionary)item.merged.get(0)).get(PdfName.FF));
            int flags = 0;
            if (ff != null)
                flags = ff.intValue();
            if ((flags & PdfFormField.FF_PUSHBUTTON) != 0)
                return "";
            String value = "";
            if (v.isName())
                value = PdfName.decodeName(v.toString());
            else if (v.isString())
                value = ((PdfString)v).toUnicodeString();
            PdfObject opts = PdfReader.getPdfObject(((PdfDictionary)item.values.get(0)).get(PdfName.OPT));
            if (opts != null && opts.isArray()) {
                ArrayList list = ((PdfArray)opts).getArrayList();
                int idx = 0;
                try {
                    idx = Integer.parseInt(value);
                    PdfString ps = (PdfString)list.get(idx);
                    value = ps.toUnicodeString();
                    lastWasString = true;
                }
                catch (Exception e) {
                }
            }
            return value;
        }
        if (v.isString()) {
            lastWasString = true;
            return ((PdfString)v).toUnicodeString();
        }
        return PdfName.decodeName(v.toString());
    }

    /**
     * Sets a field property. Valid property names are:
     * <p>
     * <ul>
     * <li>textfont - sets the text font. The value for this entry is a <CODE>BaseFont</CODE>.<br>
     * <li>textcolor - sets the text color. The value for this entry is a <CODE>java.awt.Color</CODE>.<br>
     * <li>textsize - sets the text size. The value for this entry is a <CODE>Float</CODE>.
     * <li>bgcolor - sets the background color. The value for this entry is a <CODE>java.awt.Color</CODE>.
     *     If <code>null</code> removes the background.<br>
     * <li>bordercolor - sets the border color. The value for this entry is a <CODE>java.awt.Color</CODE>.
     *     If <code>null</code> removes the border.<br>
     * </ul>
     * @param field the field name
     * @param name the property name
     * @param value the property value
     * @param inst an array of <CODE>int</CODE> indexing into <CODE>AcroField.Item.merged</CODE> elements to process.
     * Set to <CODE>null</CODE> to process all
     * @return <CODE>true</CODE> if the property exists, <CODE>false</CODE> otherwise
     */    
    public boolean setFieldProperty(String field, String name, Object value, int inst[]) {
        if (writer == null)
            throw new RuntimeException("This AcroFields instance is read-only.");
        try {
            Item item = (Item)fields.get(field);
            if (item == null)
                return false;
            InstHit hit = new InstHit(inst);
            if (name.equalsIgnoreCase("textfont")) {
                for (int k = 0; k < item.merged.size(); ++k) {
                    if (hit.isHit(k)) {
                        PdfString da = (PdfString)PdfReader.getPdfObject(((PdfDictionary)item.merged.get(k)).get(PdfName.DA));
                        PdfDictionary dr = (PdfDictionary)PdfReader.getPdfObject(((PdfDictionary)item.merged.get(k)).get(PdfName.DR));
                        if (da != null && dr != null) {
                            Object dao[] = splitDAelements(da.toUnicodeString());