Using FOP (Formatting Objects Processor) to create pdf from a servlet

[womblies]

On my Jsp page i have a call to servlet thats using Fop to create a pdf report. In the servlet it needs two input sources of xsl and xml.
My problem occurs with the xml input source, i need to have xml input source as a call to another servlet which searchs a database and dynamically creates xml format ie(out.println("<aa></aa>")).

The pdf will be produced but it will have no information on it.

 

[Diancecht]

OK, so now we have an idea of the problem but ... which is the exact question?

Cheers,
Dian

 

[womblies]

the problem that i can't get the report to generate properly when i dynamically generate the xml from a servlet.
as an input source for the xml i'm using:

Source src = new StreamSource("[URL unfurl="true"]http://localhost:8080/Report/servlet/ReportRee020DSB....)[/URL]

which when run will generate a blank pdf.
i know that the call to the servlet 'reportRee..' will generate the correct xml but fop can't understand it.

but if i called a file from the hard drive with sample data

Source src = new StreamSource(new File("C:/fop-0.20.5/data.xml"));

it will show data on the pdf.

my problem is that i can't use the file method.

 

[Diancecht]

Not sure about this, but maybe

Source xslSource = new StreamSource(new URL([URL unfurl="true"]http://localhost:8080/Report/servlet/ReportRee020DSB....).openStream());[/URL]

could do the trick.

You can always write to a temp file, but that's not really elegant.

Cheers,
Dian

 

[womblies]

no that didn't work for me.it is getting into the other servlet and going through the steps to create the xml but still it outputing a blank pdf.

would the problem be what i'm outputting on the 'ReportRee020DSB' servlet

out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
out.println("<rpt>");
out.println("  <booking>");
out.println("    <BKIN>"+ reportListINVOCEDSB1.getValue(new Integer(programObject.geteBKIN()).toString(),"0") +"</BKIN>");
out.println("    <BKIT><![CDATA["+ new Integer(programObject.geteBKIT()).toString() +"]]></BKIT>");
out.println("    <BKDS><![CDATA["+ utils.translateChar(utils.ReplaceChar(programObject.geteBKDS())) +"]]></BKDS>");
out.println("    <BKUN><![CDATA["+ new Integer(programObject.geteBKUN()).toString() +"]]></BKUN>");
out.println("    <BKPR><![CDATA["+ utils.roundDoubleToString(programObject.geteBKPR(),2) +"]]></BKPR>");
out.println("    <BKTO><![CDATA["+ utils.roundDoubleToString(programObject.geteBKTO(),2) +"]]></BKTO>");
out.println("  </booking>");
out.println("</rpt>");

 

[Diancecht]

I'd try writing it to a temp file to check it's fully correct.

Cheers,
Dian

 

[womblies]

i have tried just calling 'ReportRee020DSB' by itself from a jsp page and the xml comes out correctly

 

[Diancecht]

And generating the pdf from that file?

Cheers,
Dian

 

[womblies]

that is exactly what i'm calling from the StreamSource and its not returning aything

is it anything to do with println returning a void

 

[Diancecht]

Ok, let's see if I understand the problem:

1.- You call the servlet
2.- You write the response to an xml disk file that seems to be ok
3.- You generate the pdf from that xml disk file and it doesn't work.

My fisrt conclusion is that the problem is in the servlet, not the jsp.

Cheers,
Dian

 

[womblies]

yes i can call the servlet(Fop).
in this servlet(Fop) i call another servlet(ReportRee020DSB) to output the xml required.

 Fop Servlet
package report;
import java.io.*;
import java.util.*;
import java.net.URL;
import javax.rmi.PortableRemoteObject;
import javax.ejb.CreateException;
import javax.naming.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.xml.transform.Source;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.*;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXSource;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.stream.StreamSource;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import org.apache.fop.apps.Driver;
import org.apache.fop.apps.XSLTInputHandler;
import org.apache.fop.messaging.MessageHandler;

import org.apache.avalon.framework.logger.ConsoleLogger;
import org.apache.avalon.framework.logger.Logger;

//import org.w3c.dom.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

//import oracle.xml.parser.v2.*;

public class TestFop extends HttpServlet {
	private ReportUtils utils;
	protected TransformerFactory transformerFactory;
	static final String TYPE_REQUEST_PARAM = "type";
	
	Logger log = null;
	
	public TestFop(){
		log = new ConsoleLogger(ConsoleLogger.LEVEL_WARN);
		this.transformerFactory = TransformerFactory.newInstance();
	}
	public void doGet(HttpServletRequest request, HttpServletResponse response)	throws ServletException, IOException{
		try{
			String typeParam = request.getParameter(TYPE_REQUEST_PARAM);
			Driver driver = new Driver();
			driver.setLogger(this.log);
			driver.setRenderer(Driver.RENDER_PDF);
	
			//Setup a buffer to obtain the content length
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			driver.setOutputStream(out);
		
			//Setup Transformer
			Source xsltSrc = new StreamSource("[URL unfurl="true"]http://localhost:8080/Report/Jsp/test.xsl");[/URL]
			Transformer transformer = this.transformerFactory.newTransformer(xsltSrc);
		
			//Make sure the XSL transformation's result is piped through to FOP
			Result res = new SAXResult(driver.getContentHandler());
		
			//Setup input
			//Source src = new StreamSource("[URL unfurl="true"]http://localhost:8080/Report/Jsp/data.xml");[/URL]			// test xml file
			[b]Source src = new StreamSource((new URL("[URL unfurl="true"]http://localhost:8080/Report/servlet/ReportRee020DSB?target=CFrame&BKIN=1&pBKIN=1&rangeBKIN0001=1&pFLD=&pMESSAGE=&pTRASNA=null&pSIOS=1&pXMLFLAG=4")).openStream());[/URL][/b]
			transformer.transform(src, res);
		
			//Prepare response
			response.setContentType("application/pdf");
			response.setContentLength(out.size());
			
			//Send content to Browser
			response.getOutputStream().write(out.toByteArray());
			response.getOutputStream().flush();
		}catch (Exception ex) {
			throw new ServletException(ex);
		}
	}
}

to test i called the servlet((ReportRee020DSB) by itself and it will output to the screen the required xml.

but when i call 'ReportRee020DSB' as an input stream(bold text)it will generate a blank pdf

yes i agree the problem is in the servlet but where

 

[Diancecht]

I'd do this test:

1.- Call the servlet and write the response to a file
2.- Generate the pdf using that file.

Cheers,
Dian

 

[womblies]

i can't use the above method of writing to a tmp file to generate the pdf.

is there a way of debuging what format 'new StreamSource(new file(...))' takes in the info and duplicating it from the call to the servlet

 

[sedj]

>>> i can't use the above method of writing to a tmp file to generate the pdf.

Why not ? Its only going to take a bit of time to write a test case for it.



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[Diancecht]

That's true, and I don't mean to make it work like that, just to see what's really happening and help to identify which part of the chain process is failing.

Cheers,
Dian

 

[womblies]

ok sorry i misunderstood what you said

 

[womblies]

hi

when i call

Source xslSource = new StreamSource(new URL([URL unfurl="true"]http://localhost:8080/Report/servlet/ReportRee020DSB....).openStream());[/URL]

what should that servlet be returing, or type of format returned