java - 在 iText 中将图像添加到 acrofield？

Question

我正在尝试使用 acrofields 填充 PDF，我能够完美地添加字符串数据，但在将图像添加到 acrofields 时遇到问题。这是我添加字符串数据的代码..

    File f = new File("F:/Test/Agreement.pdf");
    InputStream sourceTemplatePDFUrlStream = new BufferedInputStream(new FileInputStream(f));
    File destinationFile = new File("F:/Test/ag1.pdf");

    PdfReader reader = new PdfReader(sourceTemplatePDFUrlStream);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(
            destinationFile));

    AcroFields form = stamper.getAcroFields();
    Image img = Image.getInstance("E:/signature/signature.png");
    Set fields = form.getFields().keySet();

    Hashtable val = new Hashtable();
    val.put("name", "xxx" );
    val.put("city_street_zip", "xxx"+"                    "+"xxx"+"                "+"xxx");
    val.put("chck_1", "Yes" );
    val.put("chck_2", "No");
    val.put("chck_3", "Yes" );
    val.put("street_address", "xxx" );
    val.put("account_num", "1234");



    Enumeration enumeration = val.keys();

    // iterate through Hashtable val keys Enumeration
    while (enumeration.hasMoreElements()) {
        String nextElement = (String) enumeration.nextElement();
        String nextElementValue = (String) val.get(nextElement);
        //System.out.println(nextElement + ":=================fillData===================:" + nextElementValue);
        form.setField(nextElement, nextElementValue);
    }

    //Form flattening makes the form non-editable and saveable with the 
    //form val filled in
    stamper.setFormFlattening(true);

    stamper.close();

Answer 1

执行此操作的“官方”方法是使用按钮字段作为图像的占位符，并按照 my book 中所述替换按钮的“图标” :

PushbuttonField ad = form.getNewPushbuttonFromField(imageFieldName);
ad.setLayout(PushbuttonField.LAYOUT_ICON_ONLY);
ad.setProportionalIcon(true);
ad.setImage(Image.getInstance("E:/signature/signature.png"));
form.replacePushbuttonField("advertisement", ad.getField());

参见 ReplaceIcon.java完整的代码示例。

免责声明:我是 iText 的原始开发者和“iText in Action”书籍的作者。