org.apache.fop.servlet

Class FopServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.fop.servlet.FopServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

FopPrintServlet

public class FopServlet
extends javax.servlet.http.HttpServlet

Example servlet to generate a PDF from a servlet.
Servlet param is:

• fo: the path to a XSL-FO file to render

or

• xml: the path to an XML file to render
• xslt: the path to an XSLT file that can transform the above XML to XSL-FO

Example URL: http://servername/fop/servlet/FopServlet?fo=readme.fo
Example URL: http://servername/fop/servlet/FopServlet?xml=data.xml
For this to work with Internet Explorer, you might need to append "ext=.pdf" to the URL. (todo) Ev. add caching mechanism for Templates objects

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	FO_REQUEST_PARAM Name of the parameter used for the XSL-FO file
protected FopFactory	fopFactory The FopFactory used to create Fop instances
protected TransformerFactory	transFactory The TransformerFactory used to create Transformer instances
protected URIResolver	uriResolver URIResolver for use by this servlet
protected static String	XML_REQUEST_PARAM Name of the parameter used for the XML file
protected static String	XSLT_REQUEST_PARAM Name of the parameter used for the XSLT file

Constructor Summary

Constructors

Constructor and Description
FopServlet()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	configureFopFactory(FopFactoryBuilder builder) This method is called right after the FopFactory is instantiated and can be overridden by subclasses to perform additional configuration.
protected Source	convertString2Source(String param) Converts a String parameter to a JAXP Source object.
void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
protected FOUserAgent	getFOUserAgent()
void	init()
protected void	render(Source src, Transformer transformer, javax.servlet.http.HttpServletResponse response) Renders an input file (XML or XSL-FO) into a PDF file.
protected void	renderFO(String fo, javax.servlet.http.HttpServletResponse response) Renders an XSL-FO file into a PDF file.
protected void	renderXML(String xml, String xslt, javax.servlet.http.HttpServletResponse response) Renders an XML file into a PDF file by applying a stylesheet that converts the XML to XSL-FO.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FO_REQUEST_PARAM

protected static final String FO_REQUEST_PARAM

Name of the parameter used for the XSL-FO file

See Also:

Constant Field Values

XML_REQUEST_PARAM

protected static final String XML_REQUEST_PARAM

Name of the parameter used for the XML file

See Also:

Constant Field Values

XSLT_REQUEST_PARAM

protected static final String XSLT_REQUEST_PARAM

Name of the parameter used for the XSLT file

See Also:

Constant Field Values

transFactory

protected TransformerFactory transFactory

The TransformerFactory used to create Transformer instances

fopFactory

protected FopFactory fopFactory

The FopFactory used to create Fop instances

uriResolver

protected transient URIResolver uriResolver

URIResolver for use by this servlet

Constructor Detail

FopServlet

public FopServlet()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

configureFopFactory

protected void configureFopFactory(FopFactoryBuilder builder)

This method is called right after the FopFactory is instantiated and can be overridden by subclasses to perform additional configuration.

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
         javax.servlet.http.HttpServletResponse response)
           throws javax.servlet.ServletException

Overrides:

doGet in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

convertString2Source

protected Source convertString2Source(String param)

Converts a String parameter to a JAXP Source object.

Parameters:

param - a String parameter

Returns:

Source the generated Source object

renderFO

protected void renderFO(String fo,
            javax.servlet.http.HttpServletResponse response)
                 throws FOPException,
                        TransformerException,
                        IOException

Renders an XSL-FO file into a PDF file. The PDF is written to a byte array that is returned as the method's result.

Parameters:

fo - the XSL-FO file

response - HTTP response object

Throws:

FOPException - If an error occurs during the rendering of the XSL-FO

TransformerException - If an error occurs while parsing the input file

IOException - In case of an I/O problem

renderXML

protected void renderXML(String xml,
             String xslt,
             javax.servlet.http.HttpServletResponse response)
                  throws FOPException,
                         TransformerException,
                         IOException

Renders an XML file into a PDF file by applying a stylesheet that converts the XML to XSL-FO. The PDF is written to a byte array that is returned as the method's result.

Parameters:

xml - the XML file

xslt - the XSLT file

response - HTTP response object

Throws:

FOPException - If an error occurs during the rendering of the XSL-FO

TransformerException - If an error occurs during XSL transformation

IOException - In case of an I/O problem

render

protected void render(Source src,
          Transformer transformer,
          javax.servlet.http.HttpServletResponse response)
               throws FOPException,
                      TransformerException,
                      IOException

Renders an input file (XML or XSL-FO) into a PDF file. It uses the JAXP transformer given to optionally transform the input document to XSL-FO. The transformer may be an identity transformer in which case the input must already be XSL-FO. The PDF is written to a byte array that is returned as the method's result.

Parameters:

src - Input XML or XSL-FO

transformer - Transformer to use for optional transformation

response - HTTP response object

Throws:

FOPException - If an error occurs during the rendering of the XSL-FO

TransformerException - If an error occurs during XSL transformation

IOException - In case of an I/O problem

getFOUserAgent

protected FOUserAgent getFOUserAgent()

Returns:

a new FOUserAgent for FOP