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(); } }
本文来自博客，转载请标明出处：http://blog.csdn.net/ol_beta/archive/2010/10/27/5968817.aspx
