AbstractPdfView (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.servlet.view.document
Class AbstractPdfView

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.document.AbstractPdfView

All Implemented Interfaces:: BeanNameAware, ApplicationContextAware, ServletContextAware, View

public abstract class AbstractPdfView
extends AbstractView
extends AbstractView

Abstract superclass for PDF views, using Bruno Lowagie's iText package. Application-specific view classes will extend this class. The view will be held in the subclass itself, not in a template.

Note: Internet Explorer requires a ".pdf" extension, as it doesn't always respect the declared content type.

Author:: Rod Johnson, Jean-Pierre Pawlak, Juergen Hoeller

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

Constructor Summary

AbstractPdfView()
          This constructor sets the appropriate content type "application/pdf".

Method Summary

protected abstract void buildPdfDocument(Map model, com.lowagie.text.Document document, com.lowagie.text.pdf.PdfWriter writer, HttpServletRequest request, HttpServletResponse response)
          Subclasses must implement this method to build an iText PDF document, given the model.

protected void buildPdfMetadata(Map model, com.lowagie.text.Document document, HttpServletRequest request)
          Populate the iText Document's meta fields (author, title, etc.).

protected int getViewerPreferences()
          Return the viewer preferences for the PDF file.

protected com.lowagie.text.Document newDocument()
          Create a new document to hold the PDF contents.

protected com.lowagie.text.pdf.PdfWriter newWriter(com.lowagie.text.Document document, OutputStream os)
          Create a new PdfWriter for the given iText Document.

protected void prepareWriter(Map model, com.lowagie.text.pdf.PdfWriter writer, HttpServletRequest request)
          Prepare the given PdfWriter.

protected void renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response)
          Subclasses must implement this method to actually render the view.

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

addStaticAttribute, createRequestContext, exposeModelAsRequestAttributes, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute, toString

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

getServletContext, getTempDir, getWebApplicationContext, isContextRequired, setServletContext

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

getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

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

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

Constructor Summary
`AbstractPdfView()` This constructor sets the appropriate content type "application/pdf".

Method Summary
`protected abstract void`	`buildPdfDocument(Map model, com.lowagie.text.Document document, com.lowagie.text.pdf.PdfWriter writer, HttpServletRequest request, HttpServletResponse response)` Subclasses must implement this method to build an iText PDF document, given the model.
`protected void`	`buildPdfMetadata(Map model, com.lowagie.text.Document document, HttpServletRequest request)` Populate the iText Document's meta fields (author, title, etc.).
`protected int`	`getViewerPreferences()` Return the viewer preferences for the PDF file.
`protected com.lowagie.text.Document`	`newDocument()` Create a new document to hold the PDF contents.
`protected com.lowagie.text.pdf.PdfWriter`	`newWriter(com.lowagie.text.Document document, OutputStream os)` Create a new PdfWriter for the given iText Document.
`protected void`	`prepareWriter(Map model, com.lowagie.text.pdf.PdfWriter writer, HttpServletRequest request)` Prepare the given PdfWriter.
`protected void`	`renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response)` Subclasses must implement this method to actually render the view.

Methods inherited from class org.springframework.web.servlet.view.AbstractView
`addStaticAttribute, createRequestContext, exposeModelAsRequestAttributes, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute, toString`

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport
`getServletContext, getTempDir, getWebApplicationContext, isContextRequired, setServletContext`

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport
`getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

AbstractPdfView

public AbstractPdfView()

This constructor sets the appropriate content type "application/pdf". Note that IE won't take much notice of this, but there's not a lot we can do about this. Generated documents should have a ".pdf" extension.

Method Detail

renderMergedOutputModel

protected final void renderMergedOutputModel(Map 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

newDocument

protected com.lowagie.text.Document newDocument()

Create a new document to hold the PDF contents.

By default returns an A4 document, but the subclass can specify any Document, possibly parameterized via bean properties defined on the View.

Returns:: the newly created iText Document instance
See Also:: Document.Document(com.lowagie.text.Rectangle)

newWriter

protected com.lowagie.text.pdf.PdfWriter newWriter(com.lowagie.text.Document document,
                                                   OutputStream os)
                                            throws com.lowagie.text.DocumentException

Create a new PdfWriter for the given iText Document.

Parameters:: document - the iText Document to create a writer for; os - the OutputStream to write to
Returns:: the PdfWriter instance to use
Throws:: com.lowagie.text.DocumentException - if thrown during writer creation

prepareWriter

protected void prepareWriter(Map model,
                             com.lowagie.text.pdf.PdfWriter writer,
                             HttpServletRequest request)
                      throws com.lowagie.text.DocumentException

Prepare the given PdfWriter. Called before building the PDF document, that is, before the call to Document.open().

Useful for registering a page event listener, for example. The default implementation sets the viewer preferences as returned by this class's getViewerPreferences() method.

Parameters:: model - the model, in case meta information must be populated from it; writer - the PdfWriter to prepare; request - in case we need locale etc. Shouldn't look at attributes.
Throws:: com.lowagie.text.DocumentException - if thrown during writer preparation
See Also:: Document.open(), PdfWriter.setPageEvent(com.lowagie.text.pdf.PdfPageEvent), PdfWriter.setViewerPreferences(int), getViewerPreferences()

getViewerPreferences

protected int getViewerPreferences()

Return the viewer preferences for the PDF file.

By default returns AllowPrinting and PageLayoutSinglePage, but can be subclassed. The subclass can either have fixed preferences or retrieve them from bean properties defined on the View.

Returns:: an int containing the bits information against PdfWriter definitions
See Also:: PdfWriter.AllowPrinting, PdfWriter.PageLayoutSinglePage

buildPdfMetadata

protected void buildPdfMetadata(Map model,
                                com.lowagie.text.Document document,
                                HttpServletRequest request)

Populate the iText Document's meta fields (author, title, etc.).
Default is an empty implementation. Subclasses may override this method to add meta fields such as title, subject, author, creator, keywords, etc. This method is called after assigning a PdfWriter to the Document and before calling document.open().

Parameters:: model - the model, in case meta information must be populated from it; document - the iText document being populated; request - in case we need locale etc. Shouldn't look at attributes.
See Also:: Document.addTitle(java.lang.String), Document.addSubject(java.lang.String), Document.addKeywords(java.lang.String), Document.addAuthor(java.lang.String), Document.addCreator(java.lang.String), Document.addProducer(), Document.addCreationDate(), Document.addHeader(java.lang.String, java.lang.String)

buildPdfDocument

protected abstract void buildPdfDocument(Map model,
                                         com.lowagie.text.Document document,
                                         com.lowagie.text.pdf.PdfWriter writer,
                                         HttpServletRequest request,
                                         HttpServletResponse response)
                                  throws Exception

Subclasses must implement this method to build an iText PDF document, given the model. Called between Document.open() and Document.close() calls.

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; document - the iText Document to add elements to; writer - the PdfWriter to use; 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 occured during document building
See Also:: Document.open(), Document.close()