uk.co.weft.graphic
Class ExampleMappedImageServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          uk.co.weft.maybeupload.MaybeUploadServlet
              uk.co.weft.htform.Servlet
                  uk.co.weft.graphic.Graphic
                      uk.co.weft.graphic.ExampleMappedImageServlet

All Implemented Interfaces:

ResourceConsumer, java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class ExampleMappedImageServlet

extends Graphic

Simple tutorial example of how to use computed mapped images in a servlet. We've found this extremely hard to do which is why we've put so much effort into producing a framework of classes to support it: this class provides an example of how to use them. It's also a simple example of how to do a non-trivial non-form with Jacquard. In addition to the other configuration parameters that all Jacquard servlets understand, this one expects 's1' and 's2' to be strings, and 'u1' and 'u2' to be URLs to map those strings to.

See Also:

MappedImage, Serialized Form

Field Summary

Fields inherited from class uk.co.weft.graphic.Graphic

contentType, format, height, width

Fields inherited from class uk.co.weft.htform.Servlet

calendar, conf, CONTENTTYPECONFIGTOKEN, cookieDomain, cookiePath, COOKIESCONFIGTOKEN, cookieTTL, dbPassword, dbUrl, dbUsername, debug, DEBUGCONFIGTOKEN, driverName, embedded, here, identity, localeMagicToken, LOCALEMAGICTOKEN, outputStreamMagicToken, OUTPUTSTREAMMAGICTOKEN, parsePathInfo, PATHINFOMAGICTOKEN, ready, redirectMagicToken, REDIRECTMAGICTOKEN, requestMagicToken, REQUESTMAGICTOKEN, resourceBundleName, responseMagicToken, RESPONSEMAGICTOKEN, servletMagicToken, SERVLETMAGICTOKEN, sessionMagicToken, SESSIONMAGICTOKEN, USEHTTPSCONFIGTOKEN, zone

Fields inherited from class uk.co.weft.maybeupload.MaybeUploadServlet

allowOverwrite, maxUpload, saveUploadedFilesToDisk, silentlyRename, uploadDir, uploadDirPath, uploadDirURL

Fields inherited from interface uk.co.weft.htform.ResourceConsumer

RESOURCEBUNDLEMAGICTOKEN

Constructor Summary

ExampleMappedImageServlet()

Method Summary

protected void	generateContent(Context context) work out whether I'm a type one (generate an HTML page) call or a type two (generate a raster image) call; despatch to the appropriate method
protected java.lang.String	getContentType(Context context) Return my computed content type in this context.

Methods inherited from class uk.co.weft.graphic.Graphic

init, paintImage

Methods inherited from class uk.co.weft.htform.Servlet

addCookie, addCookie, coerceCookiesToContext, coerceToContext, coerceToContext, coerceToContext, coerceToContext, coerceToUrl, createContext, doGet, doPost, fixupMagicValues, getCalendar, getDebug, getLocale, getOutputStream, getResource, getResourceString, getServletInfo, grs, grs, handleAction, handleCookies, handleRedirect, init, makeReady, outputRedirectBlock, setCookieValues, storeOnSession, whinge, whinge

Methods inherited from class uk.co.weft.maybeupload.MaybeUploadServlet

doDelete, doHead, doOptions, doPut, doTrace, getUploadDir, getUploadURL, service

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ExampleMappedImageServlet

public ExampleMappedImageServlet()

Method Detail

getContentType

protected java.lang.String getContentType(Context context)

Return my computed content type in this context. If I'm a 'second call' I need to be a gif; if first call, html

Overrides:

getContentType in class Servlet

Returns:

my content type in this context.

generateContent

protected void generateContent(Context context)
                        throws java.lang.Exception

work out whether I'm a type one (generate an HTML page) call or a type two (generate a raster image) call; despatch to the appropriate method

Overrides:

generateContent in class Graphic

Throws:

java.lang.Exception