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Souma

My createChart class creates faster than processing queries (due to large database, query takes some time to return the processed result to createChart class) thus i get nullpointerexception most of the time... Any help on this? How do i implement threading in this case? Any sample on applying threa...

Souma

Help~ no luck... i get error which i do not know what is wrong with it :cry: My BarChart servlet codes: package Servlet; import java.io.*; import java.net.*; import javax.servlet.*; import javax.servlet.http.*; import org.jfree.chart.ChartFactory; import org.jfree.chart.JFreeChart; import org.jfree....

Souma

cool

i'll try it out, if there's any doubts i'll post again

Souma

This is how my demo works, i have a button in my jsp page (AvailableChart.jsp). So when i click a button (Show me BarChart), it post to the BarChart servlet which is called ChartTest. Instead of displaying the chart on the same page on AvailableChart.jsp i want it to be shown on a new browser, a pop...

Souma

*bump..

Souma

*bump anyone help?

Souma

Here are the basic codes for a Line Chart to work :wink: Geez... I do hope any other people in these forum provide codes for newbie to learn/start from (espically my problem mentioned in my thread)... The demo applications provided in the package is not really "digestable" to newbie... It takes me q...

Souma

my jsp page is pie_page.jsp so i code it this way is it correct? String graphURL = request.getContextPath () + "/pie_page?filename="+ filename; Btw i made a button so that when i click on that button it runs the chart servlet <form action="ChartTest" method="post"> Pie Chart <input type="s...

Souma

Try out these buddy :wink: import org.jfree.chart.ChartFactory; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.chart.ChartUtilities; CategoryDatase...

Souma

Erm... sorry if i made a mistake

there's no declaration or some sort for the "out"

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out.println("<IMG SRC='"+graphURL+"' width='500' height='300' border='0' usemap='#"+ filename+"'>");

Souma

can't you just show me the codes so i can learn from it?

Souma

Sort of

but by changing the codes to

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response.setContentType("text/html");

it still doesn't show my chart in a new browser

Souma

Yah... i don't get it either, show how to code it?

Souma

Isn't that html tag? Can it be use on a servlet? Forgive me, i'm quite newbie.

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response.setContentType("image/jpeg"); 
ServletOutputStream objSos = response.getOutputStream(); 
ChartUtilities.writeChartAsJPEG(objSos, objCht, 600, 400);

What changes do i need to do to those codes above?

Souma

Erm.. sorry about not explaining it clearly. I simply means how can i code it in a way that when i press a button, it opens a new web browser and show the pie chart on it?

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Creating Chart and Threading

Make charts appear in new broswer