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From Milan Milanovic <milanmilanov...@yahoo.com>
Subject Re: Struts 2 And JFreeChart
Date Thu, 21 Aug 2008 15:03:51 GMT

I don't understand this solution, what is "p" parameter, and whait is
"RANDOM" ?

--
Regards, Milan


dynamicd wrote:
> 
> 
> got it to work.. could not stop the caching so added a param to the src
> 
> img
> src="/Dashboard/DisplayChart.action?p=<%=request.getParameter("RANDOM")%>"
> /
> 
> 
> 
> dynamicd wrote:
>> 
>> I have tried 
>> <%
>>    response.setHeader("Cache-Control", "no-cache"); //HTTP 1.1
>>    response.setHeader("Pragma", "no-cache"); //HTTP 1.0
>>    response.setDateHeader("Expires", 0); //prevents caching at the proxy
>> server
>> 
>> %>
>> 
>> as well..
>> 
>> 
>> 
>> newton.dave wrote:
>>> 
>>> --- On Wed, 8/6/08, dynamicd <dhaval.parekh@gmail.com> wrote:
>>>> Also tried implementing the SessionAware. However the same thing.
>>> 
>>> Why?
>>> 
>>> Did you try setting the headers for not caching?
>>> 
>>> Dave
>>> 
>>>> dynamicd wrote:
>>>> > 
>>>> > This is cool.. I tried it out. However once the 
>>>> > chart_display.jsp is called the first time through the
>>>> image tag. it does
>>>> > not call the DisplayChart.action again to refresh the
>>>> image with a new one
>>>> > when clicked on the DrawChart.action. (I added the
>>>> println statement in
>>>> > the display method to find out that the div is not
>>>> refreshing)  I have to
>>>> > log out and log in (invalidate session) to get the new
>>>> chart. I am missing
>>>> > something
>>>> > 
>>>> > 
>>>> > 	  
>>>> > 	  public String display() throws Exception {
>>>> > 	      System.out.println("I AM IN THE DISPLAY
>>>> NOW "); 
>>>> > 		    Map attributes =
>>>> ActionContext.getContext().getSession();
>>>> > 	        this.chart = (JFreeChart)
>>>> attributes.get("CHART");
>>>> > 	        
>>>> > 	        if(chart == null) {
>>>> > 	            return Constants.FORWARD_INVALIDACTION;
>>>> > 	        }
>>>> > 	        return Constants.FORWARD_SUCCESS;
>>>> > 	    } 
>>>> > 	  
>>>> > 	 
>>>> > 	 private void setChart(JFreeChart chart){
>>>> > 		 Map attributes =
>>>> ActionContext.getContext().getSession();
>>>> > 		 attributes.put("CHART", null);
>>>> > 		 this.chart = chart;
>>>> > 		 attributes.put("CHART", this.chart);
>>>> > 	 }
>>>> > 
>>>> > public JFreeChart getChart() {
>>>> > 		return chart;
>>>> > 	}
>>>> > 
>>>> > 
>>>> > 
>>>> > Leena Borle wrote:
>>>> >> 
>>>> >> Hello,
>>>> >>  See if this helps you.
>>>> >>  I have a form with remote DIV which displays
>>>> chart after user clicks on
>>>> >> submit.
>>>> >> Trick here is to generate chart object, store it
>>>> in session and display
>>>> >> it
>>>> >> in separate JSP.   Remove the form part if you
>>>> want to display just the
>>>> >> dynamic-DIV using Chart image.
>>>> >> 
>>>> >> Form.jsp [
>>>> >>         <s:form>
>>>> >>             <s:url id="display_chart"
>>>> value="DrawChart_draw.action"
>>>> >> namespace="/user" />
>>>> >> 
>>>> >>             <s:submit value="Draw
>>>> chart" href="%{display_chart}"
>>>> >> theme="ajax"
>>>> targets="*chart_div*"  />
>>>> >>             <br />
>>>> >>          </s:form>
>>>> >> 
>>>> >>     <h4>Your Running Chart</h4>
>>>> >>         <div id="*chart_div*">
>>>> >>         </div>    <!-- End display chart
>>>> -->
>>>> >>     </div>
>>>> >> 
>>>> >> ]
>>>> >> 
>>>> >> 
>>>> >> display_chart.jsp [
>>>> >> <body>
>>>> >> 
>>>> >>       /MyApp/user/DrawChart_display.action 
>>>> >> </body>
>>>> >> 
>>>> >> ]
>>>> >> 
>>>> >> 
>>>> >> struts.xml[
>>>> >>            <package name="user" 
>>>> extends
>>>> >> ="struts-default,jfreechart-default">
>>>> >>             <!--  Separate method to draw and 
>>>> display due to Remote
>>>> >> DIV/Button tag contsraints.
>>>> >>              -->
>>>> >>             <action
>>>> name="DrawChart_input" method="input"
>>>> >> class=".xxx.DrawChart">
>>>> >>                     <result
>>>> name="input">form.jsp </result>
>>>> >>             </action>
>>>> >> 
>>>> >>             <action
>>>> name="DrawChart_draw" method="draw"
>>>> >> class="xxx..DrawChart">
>>>> >>                     <result
>>>> name="success">/jsp/display_chart.jsp
>>>> >> </result>
>>>> >>             </action>
>>>> >>             <action
>>>> name="DrawChart_display"
>>>> method="display"
>>>> >> class="xxx.DrawChart">
>>>> >>                     <result
>>>> name="success" type="chart">
>>>> >>                         400
>>>> >>                         300
>>>> >>                      </result>
>>>> >>             </action>
>>>> >> 
>>>> >>            </package>
>>>> >> ]
>>>> >> 
>>>> >> 
>>>> >> DrawChart.java [
>>>> >>      JFreeChart chart;
>>>> >>     public String draw() throws Exception {
>>>> >>                  //chart creation logic.
>>>> >>               //generate chart object
>>>> >>               chart = ....
>>>> >>              session = ....
>>>> >>              session.put("CHART",
>>>> chart);
>>>> >>             return success;
>>>> >>     }
>>>> >> 
>>>> >>     /**
>>>> >>      * returns chart obejct from the session.
>>>> >>        This methos is used by display_chart.jsp
>>>> >>     */
>>>> >>     public String display() throws Exception {
>>>> >>         session = ...get session ...
>>>> >>         this.chart = (JFreeChart)
>>>> session.get("CHART");
>>>> >>         if(chart == null) {
>>>> >>            
>>>> addActionError(getText("error.nochart"));
>>>> >>             return ERROR;
>>>> >>         }
>>>> >>         return SUCCESS;
>>>> >>     }
>>>> >> 
>>>> >>     // this method will get called if we specify
>>>> chart
>>>> >>     public JFreeChart getChart() {
>>>> >>             return chart;
>>>> >>     }
>>>> >> 
>>>> >>     /**
>>>> >>      * <p> input action
>>>> >>      */
>>>> >>     public String input() throws Exception {
>>>> >>         return INPUT;
>>>> >>     }
>>>> >> 
>>>> >> ]
>>> 
>>> 
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>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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