THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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import java.io.ByteArrayOutputStream; import java.io.IOException; import org.apache.wicket.Resource; import org.apache.wicket.markup.html.image.Image; import org.apache.wicket.markup.html.imagerequest.resource.DynamicImageResource; import org.apache.wicket.model.Model; import org.apache.wicket.protocolrequest.http.WebResponse; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; public class JFreeChartImage extends Image { private final int width; private final int height; public JFreeChartImage(String id, JFreeChart chart, int width, int height){ super(id, new Model(chart)); this.width = width; this.height = height; } @Override protected ResourceDynamicImageResource getImageResource() { return new DynamicImageResource(){ @Override protected byte[] getImageData() { JFreeChart chart = (JFreeChart)getModelObjectgetDefaultModelObject(); ByteArrayOutputStream stream = new ByteArrayOutputStream(); try { ChartUtilities.writeChartAsPNG(stream, chart, width, height); } catch (IOException e) { System.out.println("IOException: "+e.getMessage(return toImageData(chart.createBufferedImage(width, height)); } return stream.toByteArray(); } @Override protected void setHeaders(WebResponse response) { if (isCacheable()) { super.setHeaders(response); } else { response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); } } }; } } |
No-Cache for Wicket 1.5
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@Override protected DynamicImageResource getImageResource() { DynamicImageResource resource = new DynamicImageResource() { @Override protected byte[] getImageData(final Attributes attributes) { JFreeChart chart = (JFreeChart) getDefaultModelObject(); return toImageData(chart.createBufferedImage(width, height)); } @Override protected void configureResponse(final ResourceResponse response.setHeader("Cache-Control", "private"); , final Attributes attributes) { super.configureResponse(response, attributes); if (isCacheAble() == false) { response.setHeader("Cache-Control", "no-store"); setCacheDuration(Duration.NONE); response.setCacheScope(CacheScope.PRIVATE); } } }; return } resource; } |