itext操作pdf表單域
阿新 • • 發佈：2019-01-23
寫這個純屬是為了總結最近所學的知識，也是為了給後面用的到人的一些幫助。因為自己在國內查找了不少資料，但都不是自己想要的。
背景：建立合同時，需要填寫某些文字域、radio、checkbox還有最後需要對合同簽名，所以需要研究使用，而不是採用外部編輯器。itext簡介
iText是一種生成PDF報表的Java元件。通過在伺服器端使用Jsp或JavaBean生成PDF報表
因為itext版本太多，我這裡採用的是5.5.3,只供讀者參考。表單域
檢視例子後發現，無法符合我的需求，我是讀取上傳的pdf模板，並修改其表單域，在寫入到新的檔案中，可以理解為
讀取a PdfStamper很好的解決了這一問題，我們看看api的介紹
Applies extra content to the pages of a PDF document. This extra content can be all the objects allowed in PdfContentByte including pages from other Pdfs. The original PDF will keep all the interactive elements including bookmarks, links and form fields.
//test為原始檔流 理解為上文的檔案a
PdfReader reader = new PdfReader(dest);
//outputStream 理解為上文的檔案b
PdfStamper stamper = new PdfStamper(reader, outputStream
);
text域
public static void creatTextField(PdfStamper pdfStamper, PdfReader reader) throws IOException, DocumentException {
PdfWriter writer = pdfStamper.getWriter radio
需要注意的是，radio是一組一組的。
public static void creatRadioCheckField(PdfStamper pdfStamper,PdfReader reader) throws IOException, DocumentException {
PdfWriter writer = pdfStamper.getWriter();
//radio框
// PdfFormField radioForm=PdfFormField.createRadioButton(writer, true);
PdfFormField radiogroup=PdfFormField.createRadioButton(writer, true);
radiogroup.setFieldName("test");
RadioCheckField bt=new RadioCheckField(writer, new Rectangle(100, 500, 120, 518), null, "v1");
// bt.setCheckType(RadioCheckField.TYPE_CROSS);//X型
// bt.setCheckType(RadioCheckField.TYPE_DIAMOND);//菱形
// bt.setCheckType(RadioCheckField.TYPE_SQUARE);//正方形
// bt.setCheckType(RadioCheckField.TYPE_STAR);//星星圖案
// checkField.setCheckType(RadioCheckField.TYPE_CHECK);//checkbox
bt.setCheckType(RadioCheckField.TYPE_CIRCLE);//圓型 radio
bt.setBackgroundColor(new GrayColor(0.8f));//這個顏色看起來比較舒服，建議只採用設定背景顏色
// bt.setChecked(true);//設定radio是否被選中
PdfFormField f1 = bt.getRadioField();
f1.setPlaceInPage(1);
radiogroup.addKid(f1);
RadioCheckField bt3=new RadioCheckField(writer, new Rectangle(100, 300, 120, 318), null, "v3");
bt3.setCheckType(RadioCheckField.TYPE_CIRCLE);//圓型 radio
bt3.setBackgroundColor(new GrayColor(0.8f));
// bt2.setChecked(false);
PdfFormField f3 = bt3.getRadioField();
radiogroup.addKid(f3);
RadioCheckField bt2=new RadioCheckField(writer, new Rectangle(100, 400, 120, 418), null, "v2");
bt2.setCheckType(RadioCheckField.TYPE_CIRCLE);//圓型 radio
bt2.setBackgroundColor(new GrayColor(0.8f));
// bt2.setChecked(false);
PdfFormField f2 = bt2.getRadioField();
radiogroup.addKid(f2);
pdfStamper.addAnnotation(radiogroup,1);
}button
使用比較少
public static void creatPushbuttonField(PdfStamper pdfStamper) throws IOException, DocumentException {
PdfWriter writer = pdfStamper.getWriter();
//使表單不再可寫，也就是禁用表單了
pdfStamper.setFormFlattening(true);
pdfStamper.setFreeTextFlattening(true);
PdfFormField form = PdfFormField.createPushButton(writer);
PushbuttonField button = new PushbuttonField(writer, new Rectangle(100, 100, 200, 200), "Button1");
button.setText(JAPANESE);
button.setFontSize(0);
// button.setImage(Image.getInstance("image.png"));
button.setLayout(PushbuttonField.LAYOUT_ICON_TOP_LABEL_BOTTOM);
button.setBackgroundColor(new BaseColor(0, 255, 255));
// button.setBorderStyle(PdfBorderDictionary.STYLE_SOLID);
// button.setBorderColor( new BaseColor(255, 0, 0));
// button.setBorderWidth(3);
PdfFormField buttonFormField = button.getField();
// buttonFormField.setAction(PdfAction.createSubmitForm("http://www.baidu.com", null, 0));
// buttonFormField.setAction(PdfAction.createSubmitForm("http://www.baidu.com", null, 0));
form.addKid(buttonFormField);
pdfStamper.addAnnotation(form,1);
}表單域賦值
文字域賦值 text文字域名字，aa是展現在pdf文件上文字域中的內容
docData.put("text","aa")
radio賦值 text為radio組名字，aa為一組radio其中一個radio域名字，填寫後，在pdf即此radio勾選
docData.put("text","aa")
checkbox賦值 text為checkbox域名字，新增 “Yes” 或“Off”，表示勾選和不勾選
docData.put("text","Yes")去除表單域
public static void main(String[] args) {
FileOutputStream out= null;
PdfReader reader=null;
PdfStamper pdfStamper=null;
try {
out = new FileOutputStream(new File(second));
reader=new PdfReader(new FileInputStream(new File(save)));
pdfStamper=new PdfStamper(reader,out);
AcroFields s = pdfStamper.getAcroFields();
Map<String, AcroFields.Item> acroFieldMap=s.getFields();
Set<String> keySet = acroFieldMap.keySet();
Object[] keySetStr = keySet.toArray();
for (Object s1 : keySetStr) {
s.removeField(s1.toString());
}
pdfStamper.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}PDF TO Image
public static void Pdf_Png(int pageNumber,String desk,String target ) {
int pagen= pageNumber;
File file = new File(DEST);
PDFFile pdffile=null;
// set up the PDF reading
try{
RandomAccessFile raf = new RandomAccessFile(file, "r");
FileChannel channel = raf.getChannel();
ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
buf.clear();
byte[] b = new byte[buf.capacity()];
buf.get(b, 0, b.length);
// FileOutputStream outputStream =new FileOutputStream("F:\\公司相關資料\\pdf\\test2.pdf");
// outputStream.write(b);
// outputStream.close();
pdffile = new PDFFile(buf);
} catch(Exception e){
e.printStackTrace();
}
if(pagen<pdffile.getNumPages())
return;
//print出該pdf文件的頁數
System.out.println(pdffile.getNumPages());
//設定將第pagen也生成png圖片
PDFPage page = pdffile.getPage(pagen);
// create and configure a graphics object
int width = (int)page.getBBox().getWidth();
int height =(int)page.getBBox().getHeight();
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// do the actual drawing
PDFRenderer renderer = new PDFRenderer(page, g2,
new Rectangle(0, 0, width, height), null, Color.RED);
try{
page.waitForFinish();
}catch(Exception e){
e.printStackTrace();
}
renderer.run();
g2.dispose();
try{
ImageIO.write(img, "png", new File(target));
}
catch(Exception ex){
ex.printStackTrace();
}
}