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利用Flying Saucer 和 java iText 实现HTMl转PDF

2013-11-05 11:22 375 查看
一直对java iText 感兴趣，今天终于找到了一篇好文章，原文地址： http://blog.lichengwu.cn/java/2010/10/27/using-flying-saucer-and-itext-convert-html-to-pdf/

文章内容如下：

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：

[code]<?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pdf
[code]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。

[code]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 

[code]public class PDFServlet extends HttpServlet {
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/pdf");
        StringBuffer buf = newStringBuffer();
        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();
        }
    }
}


原文地址:http://today.java.net/pub/a/today/2007/06/26/generating-pdfs-with-flying-saucer-and-itext.html
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