Here's an example that I wish I had when I started.:
I'm creating the InputSources from files, you can create them from anything.
In practice, I create them from DOM Documents.
PdfServlet.java:
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package org.sbyrne.pdfservlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// FOP
import org.apache.fop.apps.FOPException;
import org.xml.sax.InputSource;
// Logger
import org.apache.log4j.Logger;
import org.apache.log4j.Level;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.sax.SAXSource;
/**
* A Servlet to return a PDF if the user is authenticated.
*
* @author Stephen Byrne
* @version $Revision: 1.3 $
*/
public class PdfServlet implements Servlet {
/* Location of xml files */
static final String FILELOC="../../cygwin/home/sbyrne/xsl/";
/* XSL file name */
static final String XSL="data.xsl";
/* XML file name */
static final String XML="data.xml";
/* Log4J Logger */
static final Logger log = Logger.getLogger(PdfServlet.class);
/* Servlet Config */
private ServletConfig config;
/**
* Servlet initiation.
* Configure and set log debug level.
*
* @param config ServletConfig
*
* @throws ServletException
*/
public void init (ServletConfig config) throws ServletException {
this.config = config;
log.setLevel( Level.DEBUG );
} // init()
/**
* Servlet destroy.
*/
public void destroy() {
} // destroy()
/**
* Return servlet configuration.
*
* @return ServletConfig Servlet Configuration
*/
public ServletConfig getServletConfig() {
return config;
} // getServletConfig()
/**
* Return servlet Information
*
* @return String Servlet Information
*/
public String getServletInfo() {
return "A Simple Servlet";
} // getServletInfo()
/**
* Service ServletRequest.
* Check authorization and return PDF (or error)
*
* @param request ServletRequest
* @param response ServletReponse
*
* @throws ServletException
* @throws IOException
*/
public void service (ServletRequest request, ServletResponse response )
throws ServletException, IOException {
try {
InputSource xmlSource = new InputSource(
new FileInputStream( FILELOC + XML ) );
InputSource xslSource = new InputSource(
new FileInputStream( FILELOC + XSL ) );
Pdf pdf = new Pdf( xmlSource, xslSource );
response.setContentType( pdf.getContentType() );
response.setContentLength( pdf.getContentLength() );
response.getOutputStream().write( pdf.toByteArray() );
}
catch ( FOPException ex ) {
log.error( "FOP processing error: " + ex.getMessage() );
}
catch ( FileNotFoundException ex ) {
log.error( "Included XSL file not found: " + ex.getMessage() );
}
catch ( IOException ex ) {
log.error( "I/O error in XSLT or FOP: " + ex.getMessage() );
}
} // service()
} // PdfServlet
---------------------------------
Pdf.java:
-----------------------------------
package org.sbyrne.pdfservlet;
import java.io.ByteArrayOutputStream;
// FOP
import org.xml.sax.InputSource;
import org.apache.fop.apps.Driver;
import org.apache.fop.apps.TraxInputHandler;
import org.apache.fop.apps.FOPException;
// Logger
import org.apache.avalon.framework.logger.Log4JLogger;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;
/**
* A PDF, created from XML and XSLT sources with FOP
*
* @author Stephen Byrne
* @version $Revision: 1.1.1.1 $
*/
public class Pdf {
/* ByteArrayOutputStream to store PDF in */
private ByteArrayOutputStream pdfStream;
/* Log4J Logger */
final static Logger log = Logger.getLogger(Pdf.class);
/* FOP Driver */
private Driver driver;
/**
* Pdf Constructor
* Create a Pdf and access it and its properties
*
* @param xmlSource Source XML
* @param xslSource Source XSL
*
* @param log Logger
*/
public Pdf( InputSource xmlSource, InputSource xslSource )
throws FOPException {
pdfStream = new ByteArrayOutputStream();
driver = new Driver();
log.setLevel(Level.DEBUG);
driver.setLogger( new Log4JLogger(log) );
driver.setRenderer( Driver.RENDER_PDF );
driver.setOutputStream( pdfStream );
log.debug("Create TraxInputHandler");
TraxInputHandler input = new TraxInputHandler(
xmlSource, xslSource );
log.debug("Run Driver. . .");
input.run(driver);
log.debug("Done.");
} // Pdf
/**
* Return the content type
*
* @return Content Type
*/
public String getContentType() {
return "application/pdf";
} // getContentType()
/**
* Return the content length
*
* @return Content Length
*/
public int getContentLength() {
return pdfStream.size();
} // getContentLength()
/**
* Return the pdf as a byte array
*
* @return PDF as byte array
*/
public byte[] toByteArray() {
return pdfStream.toByteArray();
} // toByteArray
} // Pdf
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Jar's required:
avalon-framework-cvs-20020806.jar
batik.jar
fop.jar
log4j-1.2.9.jar
xalan.jar (2.6.0)
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