Well, there seems to be major problems with this
release candidate.
The good news: The problem with using a backing bean
property to dynamically set chart type is fixed.
The bad news: Everything renders beautifully. Then, no
matter what you do or what you push, you can't navigate or execute an action or
anything. Everything you do just redraws the chart... It completely breaks the
application.
Now I didn't name my jsps ending in *.jsf like his
example, but it was an existing application. my url-mapping is
/faces/*
But I gave it a shot and added *.jsf as a mapping also.
No effect - same nightmare.
I rolled back to the old version of Chart Creator (the
one that doesn't use a phase listener - uses a servlet) Added the chart servlet
back into web.xml and everything is fine again.
Arghhh... He had like one bug... Why did the software
have to be completely redesigned...
John
From: Cagatay Civici [mailto:[EMAIL PROTECTED]
Sent: Friday, June 30, 2006 5:05 AM
To: MyFaces Discussion
Subject: Re: How to displayi an images generated by a managed bean?
FYI The 1.2.0 RC1 is released at jsf-comp.
Here is the changelog;
http://www.jroller.com/page/cagataycivici?entry=jsf_charting_monster_is_back
Cheers,
Cagatay
On 6/29/06, Paul
Spencer <[EMAIL PROTECTED]>
wrote:
Cagatay,
I have not ruled anything out. I am still looking at the options. In
general I like what I see in JSF-COMP.
JSF_COMP appears to be a very simple way to embed charts!
Paul Spencer
Cagatay Civici wrote:
> Hi,
>
> Why not use the JSF Chart Creator of JSF-COMP?
>
> It does not use a servlet, instead a phaselistener to render the charts so
> there is no need to to do any configuration in the application.
>
> Cagatay
>
> On 6/29/06, Julian Ray <[EMAIL PROTECTED]> wrote:
>>
>> Sure.
>>
>> First you need to be able to access the faces context from a non-faces
>> servlet. I posted some info on the WIKI about how to get the faces
>> context
>> (and therefor all session values and access to managed beans) within a
>> servlet. Take a look at
>> http://wiki.apache.org/myfaces/AccessFacesContextFromServlet.
>>
>> Our charting servlet uses simple get params to control the chart -- as
>> this
>> is "visible" to the outside world we only pass params which allow us to
>> get
>> the appropriate managed bean and session properties from within faces
>> context. So in the doGet() we call appropriate managed beans and
>> JFreeChart
>> methods to creat and return the chart. This is standard servlet stuff
>> (with
>> the myfaces context added). Included code below
>>
>> protected void processRequest(HttpServletRequest request,
>> HttpServletResponse response) throws ServletException, IOException {
>> FacesContext facesContext = getFacesContext(request, response);
>> // Here we get whatever we need from the faces context.
>> SessionBean sessionBean = (SessionBean)
>> getSessionBean(facesContext);
>>
>> if (null == sessionBean) {
>> log.debug("Session bean is null.");
>> } else {
>> log.debug("Got session bean. Userid=" +
>> sessionBean.getUserId());
>> }
>>
>> // Get the chart type to process from the URL
>> AbstractChart chart = null;
>> Integer chartType =
>> NumberUtils.createInteger(request.getParameter("type").trim());
>>
>> log.debug("Chart Type = '" + chartType + "'");
>>
>> // Here we do whatever needed to create the chart...
>> String className = ChartType.getChartClassName(chartType);
>> log.debug("Creating chart object for class '" + className + "'");
>>
>> String reportTitle = request.getParameter("til");
>> log.debug("Chart Title = '" + reportTitle + "'");
>>
>> String reportSubTitle = request.getParameter("sub");
>> log.debug("Chart Sub Title = '" + reportSubTitle + "'");
>>
>> // See if the chart is in the cache. The servlet is
>> single-threaded
>> and reuasable which means
>> /// that a new chart map is created for each instance of a chart.
>> Charts should be serializable
>> // and not store state in any way
>> if (map.containsKey(className)) {
>> chart = (AbstractChart) map.get(className);
>> } else {
>> // Use reflection to get the chart. Note that is must have a
>> no-args constructor
>> try {
>> chart = (AbstractChart)
>> Class.forName(className).newInstance();
>> // Push the chart to the map.
>> map.put(className, chart);
>> } catch (ClassNotFoundException e) {
>> log.debug(e.getMessage());
>> throw new IOException( e.getMessage());
>> } catch (InstantiationException e) {
>> log.debug(e.getMessage());
>> throw new IOException(e.getMessage());
>> } catch (IllegalAccessException e) {
>> log.debug(e.getMessage());
>> throw new IOException(e.getMessage());
>> } catch (IllegalArgumentException e) {
>> log.debug (e.getMessage());
>> throw new IOException(e.getMessage());
>> }
>> }
>>
>> // Chart setup here
>> if (null == chart) {
>> log.error("Chart # " + chartType + " not found on server.");
>> response.setContentType("text/html");
>>
>> ServletOutputStream outputStream =
>> response.getOutputStream();
>> outputStream.println("Chart not found on server.");
>> outputStream.flush();
>> outputStream.close();
>> } else {
>> // Populate the chart so it can access the params
>> chart.setRequest(request);
>> chart.setSessionBean(sessionBean);
>>
>> // Process the chart
>> JFreeChart jfreeChart = chart.getChart();
>> // get the image
>> response.setContentType("image/png");
>> ChartUtilities.writeChartAsPNG(response.getOutputStream(),
>> jfreeChart, chart.getChartWidth(), chart.getChartHeight());
>> }
>> }
>>
>> Our JSF backing bean constructs a url based on options selected by the
>> user.
>> This url is passed to the <h:graphicImage> tag. The form of the URL is
>> /myContextRoot/myChartServlet?param1=value1¶m2=value2 etc.
>>
>> In the backing bean we have
>>
>> Public String getChartURL() {
>> StringBuffer sb = new StringBuffer();
>> sb.append("/myContextRoot/myChartServlet");
>> //sb.append(.....) etc...
>> return sb.toString();
>> }
>> and in the JSF we have
>>
>> <h:graphicImage styleClass="whatever..."
>> value="#{myBackingBean.chartURL}"
>> />
>>
>> Our servlet implementation loads chart classes as the servlet is
>> initialized
>> which speeds up the servlet once it is "warmed up".
>>
>> One more note, While this approach works well found that it is more
>> convienient to create a custom component to provide the JSF interface as
>> we
>> use charts on a large number of our pages and it fits the MVC model
>> better
>> to let the JSF fuly control the format and display of the greaphic.
>>
>> I hope this helps.
>>
>>
>>
>> Example
>>
>> -----Original Message-----
>> From: Paul Spencer [mailto:[EMAIL PROTECTED]]
>> Sent: Thursday, June 29, 2006 7:55 AM
>> To: MyFaces Discussion
>> Subject: Re: How to displayi an images generated by a managed bean?
>>
>> Julian,
>> Can you explain the code and configuration behind
>> #{myBackingBean.chartURL
>> }
>> and the servlet you have created?
>>
>> I need to understand where the graphic is created, i.e. in the managed
>> bean
>> or servlet, how the servlet gets what is needs, and any housekeeping that
>> is
>> performed.
>>
>>
>> Paul Spencer
>>
>> Julian Ray wrote:
>> > Hi Paul,
>> >
>> > We use JFreeCharts by creating a servlet which serves up the charts
>> > and then creating a URL in the backingbean which is set as the value
>> > for the graphicImage
>> >
>> > Eg <h:graphicImage styleClass="..." value="#{myBackingBean.chartURL}"
>> > />
>> >
>> > -----Original Message-----
>> > From: Paul Spencer [mailto:[EMAIL PROTECTED]]
>> > Sent: Wednesday, June 28, 2006 11:14 PM
>> > To: MyFaces Discussion
>> > Subject: How to displayi an images generated by a managed bean?
>> >
>> > I need to include a graphic image generated by JFreeCharts. Currently
>> > the generation of the image is in an action of a managed bean and is
>> > displayed in a separate windows via <h:commandButton>. How should I
>> > convert this to a <h:graphicImage> so it can be displayed in an
>> existing
>> page?
>> >
>> > Paul Spencer
>> >
>> >
>>
>>
>>
>
