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
>> >
>> >
>>
>>
>>
>
