使用 iText 将 HTML 转换为 PDF：如何生成复选框

发布于 2024-11-09 15:27:20 字数 2675 浏览 4 评论 0原文

我有一个简单的 HTML 页面，iText 能够从中生成 PDF。没关系，但该复选框被忽略。我能做什么呢？

import java.io.FileOutputStream;
import java.io.StringReader;

import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.html.simpleparser.HTMLWorker;
import com.itextpdf.text.pdf.PdfWriter;

public class HtmlToPDF {

  public static void main(String ... args ) {
    try {
      Document document = new Document(PageSize.LETTER);
      PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream("c://temp//testpdf.pdf"));
      document.open();
      String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" + 
                   "check : <INPUT TYPE='checkbox' CHECKED/><br/>" +
                   "</FORM></BODY></HTML>";

      htmlWorker.parse(new StringReader(str));
      document.close();
      System.out.println("Done.");
      } 
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}

我让它与 YAHP ( http://www.allcolor.org/YaHPConverter/ ) 一起工作。

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


// http://www.allcolor.org/YaHPConverter/
import org.allcolor.yahp.converter.CYaHPConverter;
import org.allcolor.yahp.converter.IHtmlToPdfTransformer;

public class HtmlToPdf_yahp {

    public  static void main(String ... args ) throws Exception {
        htmlToPdfFile();
    }

    public static void htmlToPdfFile() throws Exception {
            CYaHPConverter converter = new CYaHPConverter();
            File fout = new File("c:/temp/x.pdf");
            FileOutputStream out = new FileOutputStream(fout);
            Map properties = new HashMap();
            List headerFooterList = new ArrayList();

            String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" +
                         "check : <INPUT TYPE='checkbox' checked=checked/><br/>"   +
                         "</FORM></BODY></HTML>"; 

            properties.put(IHtmlToPdfTransformer.PDF_RENDERER_CLASS,
                    IHtmlToPdfTransformer.FLYINGSAUCER_PDF_RENDERER);
            //properties.put(IHtmlToPdfTransformer.FOP_TTF_FONT_PATH, fontPath);
            converter.convertToPdf(str,
                IHtmlToPdfTransformer.A4P, headerFooterList, "file://c:/temp/", out,
                properties);
            out.flush();
            out.close();
    }
}

原文

I have a simple HTML page, iText is able to produce a PDF from it. It's fine but the checkbox is ignored. What can I do about it ?

import java.io.FileOutputStream;
import java.io.StringReader;

import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.html.simpleparser.HTMLWorker;
import com.itextpdf.text.pdf.PdfWriter;

public class HtmlToPDF {

  public static void main(String ... args ) {
    try {
      Document document = new Document(PageSize.LETTER);
      PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream("c://temp//testpdf.pdf"));
      document.open();
      String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" + 
                   "check : <INPUT TYPE='checkbox' CHECKED/><br/>" +
                   "</FORM></BODY></HTML>";

      htmlWorker.parse(new StringReader(str));
      document.close();
      System.out.println("Done.");
      } 
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}

I got it working with YAHP ( http://www.allcolor.org/YaHPConverter/ ).

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


// http://www.allcolor.org/YaHPConverter/
import org.allcolor.yahp.converter.CYaHPConverter;
import org.allcolor.yahp.converter.IHtmlToPdfTransformer;

public class HtmlToPdf_yahp {

    public  static void main(String ... args ) throws Exception {
        htmlToPdfFile();
    }

    public static void htmlToPdfFile() throws Exception {
            CYaHPConverter converter = new CYaHPConverter();
            File fout = new File("c:/temp/x.pdf");
            FileOutputStream out = new FileOutputStream(fout);
            Map properties = new HashMap();
            List headerFooterList = new ArrayList();

            String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" +
                         "check : <INPUT TYPE='checkbox' checked=checked/><br/>"   +
                         "</FORM></BODY></HTML>"; 

            properties.put(IHtmlToPdfTransformer.PDF_RENDERER_CLASS,
                    IHtmlToPdfTransformer.FLYINGSAUCER_PDF_RENDERER);
            //properties.put(IHtmlToPdfTransformer.FOP_TTF_FONT_PATH, fontPath);
            converter.convertToPdf(str,
                IHtmlToPdfTransformer.A4P, headerFooterList, "file://c:/temp/", out,
                properties);
            out.flush();
            out.close();
    }
}

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深者入戏 2024-11-16 15:27:20

您正在生成 HTML 吗？

如果是这样，那么您可以使用 Unicode“投票框”字符，即 ☐ 或 ☐，而不是使用 HTML 复选框。它只是一个方框，您无法通过电子方式勾选或取消勾选它；但如果 PDF 是用于打印的，那么人们当然可以用钢笔或铅笔在它上面打勾。

例如：

     String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" + 
               "check : ☐<br/>" +
               "</FORM></BODY></HTML>";

请注意，只有当您在 PDF 中使用 Unicode 字体时，此功能才有效；我认为 iText 不会使用 Unicode 字体，除非你告诉它。

Are you generating the HTML?

If so, then instead of using an HTML checkbox you could using the Unicode 'ballot box' character, which is ☐ or ☐. It's just a box, you can't electronically tick it or untick it; but if the PDF is intended for printing then of course people can tick it using a pen or pencil.

For example:

     String str = "<HTML><HEAD></HEAD><BODY><H1>Testing</H1><FORM>" + 
               "check : ☐<br/>" +
               "</FORM></BODY></HTML>";

Note that this will only work if you're using a Unicode font in your PDF; I think that iText won't use a Unicode font unless you tell it to.

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◇流星雨 2024-11-16 15:27:20

你在这里可能不走运。

用于解析html标签的“htmlWorker”似乎不支持“input”标签。

public static final String tagsSupportedString = "ol ul li a pre font span br p div body table td th tr i b u sub sup em strong s strike h1 h2 h3 h4 h5 h6 img";

您可以从这里访问“HtmlWorker”的源代码。
http://www.java2s.com/Open-Source/Java-Document/PDF/pdf-itext/com/lowagie/text/html/simpleparser/HTMLWorker.java.htm< br>
正是从这个来源，我发现了这一点。

 public void startElement(String tag, HashMap h) {
         if (!tagsSupported.containsKey(tag))
                return; //return if tag not supported
 // ...
}

You may be out of luck here.

The "htmlWorker" which is used to parse the html tags, doesn't seem to support the "input" tag.

public static final String tagsSupportedString = "ol ul li a pre font span br p div body table td th tr i b u sub sup em strong s strike h1 h2 h3 h4 h5 h6 img";

You can access the source code for "HtmlWorker" from here.
http://www.java2s.com/Open-Source/Java-Document/PDF/pdf-itext/com/lowagie/text/html/simpleparser/HTMLWorker.java.htm
It is from this source that I figured that out.

 public void startElement(String tag, HashMap h) {
         if (!tagsSupported.containsKey(tag))
                return; //return if tag not supported
 // ...
}

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