使用JDOM处理XML数据之PDF篇(一)

王朝java/jsp·作者佚名  2006-01-08
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使用JDOM处理XML数据之PDF篇(一)

处理XML数据的三种方式我们已经都介绍过了,

(直接读取http://www.csdn.net/Develop/read_article.asp?id=20720

和使用XSLT http://www.csdn.net/Develop/read_article.asp?id=20733)现在来看一下第三种方式即转化成二进制格式(一般为PDF)的操作。这个操作要借助http://xml.apache.org/ 提供的包fop来完成。其实这个是我整理的,不是自己写的:)它的代码如下:

package XML;

import java.io.*;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

import org.apache.fop.apps.Driver;

import org.apache.fop.apps.Version;

import javax.xml.transform.*;

import javax.xml.transform.stream.*;

/**

* Class to convert an XML document to PDF via

* XSLT and XSL formatting objects.

*/

public class PDFWriter {

protected Transformer transformer = null;

public PDFWriter () {};

public PDFWriter(StreamSource source) throws TransformerConfigurationException {

// try {

TransformerFactory factory = TransformerFactory.newInstance();

transformer = factory.newTransformer(source);

/* } catch (TransformerConfigurationException tce) {

throw new IllegalStateException("Stylesheet compilation problem: " + tce.getMessage());

} catch (TransformerFactoryConfigurationException tfce) {

throw new IllegalStateException("JAXP configuration problem: " + tce.getMessage());

}

*/

}

public PDFWriter(String xslFilePath)

throws TransformerConfigurationException, FileNotFoundException {

this( new StreamSource(new FileInputStream(xslFilePath)) );

}

/** Invoke the ASF FOP engine to create the PDF */

protected byte[] invokeFOP(InputSource foSource) throws Exception {

ByteArrayOutputStream out = new ByteArrayOutputStream();

Driver driver = new Driver(foSource, out);

driver.run();

return out.toByteArray();

}

/** Create a PDF from an XML file, using the stylesheet passed to the constructor. */

public byte[] generatePDF(String xmlFilePath) throws Exception {

StreamSource xmlSource = new StreamSource( new FileInputStream(xmlFilePath) );

return generatePDF(xmlSource);

}

/** Does the interesting stuff */

public byte[] generatePDF(StreamSource xmlSource) throws Exception {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

StreamResult foResult = new StreamResult(baos);

transformer.transform(xmlSource, foResult);

ByteArrayInputStream bais = new ByteArrayInputStream( baos.toByteArray() );

return invokeFOP( new InputSource(bais) );

}

/** To be used with files */

public static void createPDFFromXML(String xslFilePath, String xmlFilePath, String outputPDFPath) throws Exception {

FileOutputStream fos = new FileOutputStream(outputPDFPath);

createPDFFromXML(xslFilePath, new FileInputStream(xmlFilePath), fos);

fos.close();

}

/** To be called when there is no spoon (XML or PDF file) */

public static void createPDFFromXML(String xslFilePath, InputStream xmlIn, OutputStream pdfOut) throws Exception {

PDFWriter writer = new PDFWriter(xslFilePath);

byte[] PDFbytes = writer.generatePDF( new StreamSource(xmlIn) );

pdfOut.write(PDFbytes, 0, PDFbytes.length);

}

public static void main(String[] args) {

String fileBasePath = "." + File.separator;

String xmlFilePath = fileBasePath + "watchlist.xml";

String xslFilePath = fileBasePath + "watchlist2pdf.xsl";

String outputPDFPath = fileBasePath + "watchlist.pdf";

try {

PDFWriter.createPDFFromXML(xslFilePath, xmlFilePath, outputPDFPath);

} catch (Exception e) {

System.out.println(e.getMessage());

e.printStackTrace();

}

}

}

这个javabean输入一个XSL-FO的文件的位置,一个XML文件的位置,输出一个PDF文件。

 
 
 
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