PDF是目前為止最流行的文檔格式之一。通常情況下，想要建立一個PDF文檔，需要使用Adobe的API來產生，但這非常麻煩。為了能方便的將HTML(XHTML)產生PDF文檔，下面介紹兩個開源的java庫：Flying Saucer和iText。
Flying Saucer和iText介紹:Flying Saucer(或者叫xhtmlrender project on java.net)是一個基於iText的開源java庫，能夠輕鬆的將html(帶css2.1)產生pdf。
iText是一個產生PDF文檔的開源java庫，能夠動態從XML或者資料庫產生PDF，同時它具備PDF文檔的絕大多數屬性(比如加密……)，支援java，C#等。
產生簡單的PDF下面我們首先建立一個簡單的帶css的html，代碼如下：
<?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>
接下來產生一個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(); }}結果如下:用Fly產生內容
下面的我們先用StringBuilder產生一個HTML的字串，然後用DOM解析，產生PDF。
package 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:在服務端建立PDF下面展示在servlet裡面建立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
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