利用Flying Saucer 和 iText 实现HTMl转PDF(java)
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pdf
package 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。
com.sankuai.meituan.ct.doamin;
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 = 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