Example usage for org.jfree.chart.servlet ServletUtilities createTempDir

Introduction

In this page you can find the example usage for org.jfree.chart.servlet ServletUtilities createTempDir.

Prototype

protected static void createTempDir() 

Source Link

Document

Creates the temporary directory if it does not exist.

Usage

From source file:com.portalbook.charting.PortletUtilities.java

/**
 * Saves the chart as a PNG format file in the temporary directory and
 * populates the ChartRenderingInfo object which can be used to generate
 * an HTML image map./* ww w.j av a2 s.  c o m*/
 *
 * @param chart  the chart to be saved (<code>null</code> not permitted).
 * @param width  the width of the chart.
 * @param height  the height of the chart.
 * @param info  the ChartRenderingInfo object to be populated (<code>null</code> permitted).
 * @param session  the PortletSession of the client.
 *
 * @return the filename of the chart saved in the temporary directory.
 *
 * @throws IOException if there is a problem saving the file.
 */
public static String saveChartAsPNG(JFreeChart chart, int width, int height, ChartRenderingInfo info,
        PortletSession session) throws IOException {
    if (chart == null) {
        throw new IllegalArgumentException("Null 'chart' argument.");
    }
    ServletUtilities.createTempDir();
    File tempFile = File.createTempFile(PortletUtilities.getTempFilePrefix(), ".png",
            new File(System.getProperty("java.io.tmpdir")));
    ChartUtilities.saveChartAsPNG(tempFile, chart, width, height, info);
    PortletUtilities.registerChartForDeletion(tempFile, session);
    return tempFile.getName();
}

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