http://blog.csdn.net/ol_beta/archive/2010/10/27/5968817.aspx

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PDF是目前为止最流行的文档格式之一。通常情况下，想要创建一个PDF文档，需要使用Adobe的API来生成，但这非常麻烦。为了能方便的将HTML(XHTML)生成PDF文档，下面介绍两个开源的java库：Flying Saucer和iText。

Flying Saucer和iText介绍:
Flying Saucer(或者叫xhtmlrender project on java.net)是一个基于iText的开源java库，能够轻松的将html(带css2.1)生成pdf。

iText是一个生成PDF文档的开源java库，能够动态从XML或者数据库生成PDF，同时它具备PDF文档的绝大多数属性(比如加密……)，支持java，C#等。

生成简单的PDF
下面我们首先创建一个简单的带css的html，代码如下：

<?xml version="1.0
" encoding="UTF-8
"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN
"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
">
<html xmlns="http://www.w3.org/1999/xhtml
">
    <head>
        <title>My First Document</title>
        <style type
="text/css
"> b { color: green; } </style>
    </head>
    <body>
        <p>
            <b>Greetings Earthlings!</b>
            We've come for your Java.
        </p>
    </body>
</html>接下来生成一个pdfpackage oliver.itext.html2pdf;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.xhtmlrenderer.pdf.ITextRenderer;

import com.lowagie.text.DocumentException;

public class FirstDoc
{

public static void main(String[] args) throws DocumentException, IOException
{
  String path =System.getProperty("user.dir")+"/src/";
  String inputFile =path+"samples/firstdoc.html";
  String url = new File(inputFile).toURI().toURL().toString();
  String outputFile = path+"outputs/fistdoc.pdf";
  OutputStream os = new FileOutputStream(outputFile);
  ITextRenderer render = new ITextRenderer();
  render.setDocument(url);
  render.layout();
  render.createPDF(os);

  os.close();
}
}结果如下:

用Fly生成内容
下面的我们先用StringBuilder生成一个HTML的字符串，然后用DOM解析，生成PDF。

package
oliver.itext.html2pdf;

import
java.io.FileOutputStream;
import
java.io.OutputStream;
import
java.io.StringBufferInputStream;

import
javax.xml.parsers.DocumentBuilder;
import
javax.xml.parsers.DocumentBuilderFactory;

import
org.w3c.dom.Document;
import
org.xhtmlrenderer.pdf.ITextRenderer;

@SuppressWarnings("deprecation
")
public
class
OneHundredBottles
{
public
static
void
main(String[] args) throws
Exception
{
  String path =System.getProperty("user.dir
")+"/src/
";

  StringBuffer buf = new
StringBuffer();
     buf.append("<html>
");

     // put in some style

     buf.append("<head><style language='text/css'>
");
     buf.append("h3 { border: 1px solid #aaaaff; background: #ccccff;
");
     buf.append("padding: 1em; text-transform: capitalize; font-family: sansserif; font-weight: normal;}
");
     buf.append("p { margin: 1em 1em 4em 3em; } p:first-letter { color: red; font-size: 150%; }
");
     buf.append("h2 { background: #5555ff; color: white; border: 10px solid black; padding: 3em; font-size: 200%; }
");
     buf.append("</style></head>
");

     // generate the body

     buf.append("<body>
");
     buf.append("<p><img src='
"+path+"samples/100bottles.jpg'/></p>
");
     for
(int
i=99; i>0; i--) {
         buf.append("<h3>
"+i+" bottles of beer on the wall,
"
                 + i + " bottles of beer!</h3>
");
         buf.append("<p>Take one down and pass it around,
"
                 + (i-1) + " bottles of beer on the wall</p>/n
");
     }
     buf.append("<h2>No more bottles of beer on the wall, no more bottles of beer.
");
     buf.append("Go to the store and buy some more, 99 bottles of beer on the wall.</h2>
");
     buf.append("</body>
");
     buf.append("</html>
");

     DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
     Document doc = builder.parse(new
StringBufferInputStream(buf.toString()));

ITextRenderer renderer = new
ITextRenderer();
renderer.setDocument(doc, null
);

     String outputFile = path+"outputs/100bottles.pdf
";
     OutputStream os = new
FileOutputStream(outputFile);
     renderer.layout();
     renderer.createPDF(os);
     os.close();

}
}效果如下:

在服务端创建PDF
下面展示在servlet里面创建pdf

public
class
PDFServlet extends
HttpServlet {

    protected
void
processRequest(HttpServletRequest request, HttpServletResponse response)
            throws
ServletException, IOException {
        response.setContentType("application/pdf
");

        StringBuffer buf = new
StringBuffer();
        buf.append("<html>
");

        String css = getServletContext().getRealPath("/PDFservlet.css
");
        // put in some style

        buf.append("<head><link rel='stylesheet' type='text/css'
"+
                "href='
"+css+"' media='print'/></head>
");

        ... //generate the rest of the HTML

// parse our markup into an xml Document

        try
{
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = builder.parse(new
StringBufferInputStream(buf.toString()));
            ITextRenderer renderer = new
ITextRenderer();
            renderer.setDocument(doc, null
);
            renderer.layout();
            OutputStream os = response.getOutputStream();
            renderer.createPDF(os);
            os.close();
        } catch
(Exception ex) {
            ex.printStackTrace();
        }
    }

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