本文主要介紹如何用PDFlib 7創建一個加密的并包含多個表單域的線性化PDF文檔。

下面是其Java代碼：

/* $Id: starter_webform.java,v 1.3 2006/09/28 11:06:18 $
*
* Webform starter:
* create a linearized PDF (for fast delivery over the Web, also known
* as "fast Web view") which is encrypted and contains some form fields.
* A few lines of JavaScript are inserted as "page open" action to
* automatically populate the date field with the current date.
*
* required software: PDFlib/PDFlib+PDI/PPS 7 or above
* required data: none
*/

import java.io.*;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class starter_webform
{
public static void main (String argv[])
{
pdflib p = null;
String optlist;
int font, action;
double llx=150, lly=550, urx=350, ury=575;

/* JavaScript for automatically filling the date into a form field */
String js =
"var d = util.printd(\"mm/dd/yyyy\", new Date());" +
"var date = this.getField(\"date\");" +
"date.value = d;";

try {
p = new pdflib();

/* This means we must check return values of load_font() etc. */
 p.set_parameter("errorpolicy", "return");

/* Prevent changes with a master password */
 optlist = "linearize masterpassword=pdflib permissions={nomodify}";

if (p.begin_document("starter_webform.pdf", optlist) == -1)
 throw new Exception("Error: " + p.get_errmsg());

p.set_info("Creator", "PDFlib starter sample");
 p.set_info("Title", "starter_webform");

optlist = "script={" + js + "}";
 action = p.create_action("JavaScript", optlist);

optlist = "action={open=" + action + "}";
p.begin_page_ext(595, 842, optlist);

font = p.load_font("Helvetica", "winansi", "");

if (font == -1)
 throw new Exception("Error: " + p.get_errmsg());

p.setfont(font, 24);

p.fit_textline("Date: ", 125, lly+5, "position={right bottom}");

/* The tooltip will be used as rollover text for the field */
optlist =
"tooltip={Date (will be filled automatically)} " +
"bordercolor={gray 0} font=" + font;
 p.create_field(llx, lly, urx, ury, "date", "textfield", optlist);

lly-=100; ury-=100;
 p.fit_textline("Name: ", 125, lly+5, "position={right bottom}");

optlist =
"tooltip={Enter your name here} " +
"bordercolor={gray 0} font=" + font;
 p.create_field(llx, lly, urx, ury, "name", "textfield", optlist);

p.end_page_ext("");

p.end_document("");

} catch (PDFlibException e){
System.err.print("PDFlib exception occurred:\n");
System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +
": " + e.get_errmsg() + "\n");
} catch (Exception e) {
System.err.println(e.getMessage());
} finally {
if (p != null) {
p.delete();
}
}
}
}