org.springframework.web.servlet.view.document

Class AbstractPdfStamperView

java.lang.Object

org.springframework.context.support.ApplicationObjectSupport

org.springframework.web.context.support.WebApplicationObjectSupport

org.springframework.web.servlet.view.AbstractView

org.springframework.web.servlet.view.AbstractUrlBasedView

org.springframework.web.servlet.view.document.AbstractPdfStamperView

All Implemented Interfaces:

Aware, BeanNameAware, InitializingBean, ApplicationContextAware, ServletContextAware, View

public abstract class AbstractPdfStamperView
extends AbstractUrlBasedView

Abstract superclass for PDF views that operate on an existing document with an AcroForm. Application-specific view classes will extend this class to merge the PDF form with model data.

This view implementation uses Bruno Lowagie's iText API. Known to work with the original iText 2.1.7 as well as its fork OpenPDF. We strongly recommend OpenPDF since it is actively maintained and fixes an important vulnerability for untrusted PDF content.

Thanks to Bryant Larsen for the suggestion and the original prototype!

Since:

2.5.4

Author:

Juergen Hoeller

See Also:

AbstractPdfView

Field Summary

Fields inherited from class org.springframework.web.servlet.view.AbstractView

DEFAULT_CONTENT_TYPE

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Fields inherited from interface org.springframework.web.servlet.View

PATH_VARIABLES, RESPONSE_STATUS_ATTRIBUTE, SELECTED_CONTENT_TYPE

Constructor Summary

Constructors

Constructor and Description
AbstractPdfStamperView()

Method Summary

Modifier and Type	Method and Description
protected boolean	generatesDownloadContent() Return whether this view generates download content (typically binary content like PDF or Excel files).
protected abstract void	mergePdfDocument(Map<String,Object> model, com.lowagie.text.pdf.PdfStamper stamper, HttpServletRequest request, HttpServletResponse response) Subclasses must implement this method to merge the PDF form with the given model data.
protected com.lowagie.text.pdf.PdfReader	readPdfResource() Read the raw PDF resource into an iText PdfReader.
protected void	renderMergedOutputModel(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response) Subclasses must implement this method to actually render the view.

Methods inherited from class org.springframework.web.servlet.view.AbstractUrlBasedView

afterPropertiesSet, checkResource, getUrl, isUrlRequired, setUrl, toString

Methods inherited from class org.springframework.web.servlet.view.AbstractView

addStaticAttribute, createMergedOutputModel, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, formatViewName, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getRequestToExpose, getStaticAttributes, isExposePathVariables, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setExposeContextBeansAsAttributes, setExposedContextBeanNames, setExposePathVariables, setRequestContextAttribute, setResponseContentType, writeToResponse

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, initApplicationContext, obtainApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractPdfStamperView

public AbstractPdfStamperView()

Method Detail

generatesDownloadContent

protected boolean generatesDownloadContent()

Description copied from class: AbstractView

Return whether this view generates download content (typically binary content like PDF or Excel files).

The default implementation returns false. Subclasses are encouraged to return true here if they know that they are generating download content that requires temporary caching on the client side, typically via the response OutputStream.

Overrides:

generatesDownloadContent in class AbstractView

See Also:

AbstractView.prepareResponse(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), ServletResponse.getOutputStream()

renderMergedOutputModel

protected final void renderMergedOutputModel(Map<String,Object> model,
                                             HttpServletRequest request,
                                             HttpServletResponse response)
                                      throws Exception

Description copied from class: AbstractView

Subclasses must implement this method to actually render the view.

The first step will be preparing the request: In the JSP case, this would mean setting model objects as request attributes. The second step will be the actual rendering of the view, for example including the JSP via a RequestDispatcher.

Specified by:

renderMergedOutputModel in class AbstractView

Parameters:

model - combined output Map (never null), with dynamic values taking precedence over static attributes

request - current HTTP request

response - current HTTP response

Throws:

Exception - if rendering failed

readPdfResource

protected com.lowagie.text.pdf.PdfReader readPdfResource()
                                                  throws IOException

Read the raw PDF resource into an iText PdfReader.

The default implementation resolve the specified "url" property as ApplicationContext resource.

Returns:

the PdfReader instance

Throws:

IOException - if resource access failed

See Also:

AbstractUrlBasedView.setUrl(java.lang.String)

mergePdfDocument

protected abstract void mergePdfDocument(Map<String,Object> model,
                                         com.lowagie.text.pdf.PdfStamper stamper,
                                         HttpServletRequest request,
                                         HttpServletResponse response)
                                  throws Exception

Subclasses must implement this method to merge the PDF form with the given model data.

This is where you are able to set values on the AcroForm. An example of what can be done at this level is:

 // get the form from the document
 AcroFields form = stamper.getAcroFields();

 // set some values on the form
 form.setField("field1", "value1");
 form.setField("field2", "Vvlue2");

 // set the disposition and filename
 response.setHeader("Content-disposition", "attachment; FILENAME=someName.pdf");

Note that the passed-in HTTP response is just supposed to be used for setting cookies or other HTTP headers. The built PDF document itself will automatically get written to the response after this method returns.

Parameters:

model - the model Map

stamper - the PdfStamper instance that will contain the AcroFields. You may also customize this PdfStamper instance according to your needs, e.g. setting the "formFlattening" property.

request - in case we need locale etc. Shouldn't look at attributes.

response - in case we need to set cookies. Shouldn't write to it.

Throws:

Exception - any exception that occurred during document building