Sample:
....
MapContext mc = mapContext;
BufferedImage bufferedImage = null;
bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
graphics2D = (Graphics2D)bufferedImage.getGraphics();
graphics2D.setRenderingHints(new
RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_SPEED));
graphics2D.setColor(Color.WHITE);
graphics2D.fillRect(0, 0, width, height);
streamingRenderer = new StreamingRenderer();
streamingRenderer.setContext(mc);
RenderingHints hints = new
RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON );
streamingRenderer.setJava2DHints(hints);
Map rendererParams = new HashMap();
rendererParams.put("optimizedDataLoadingEnabled",new Boolean(true)
);
streamingRenderer.setRendererHints(rendererParams);
streamingRenderer.paint(graphics2D, new Rectangle(width, height),
new ReferencedEnvelope(envelope,
(org.opengis.referencing.crs.CoordinateReferenceSystem)org.geotools.referenc
ing.crs.DefaultGeographicCRS.WGS84));
.....
but you should hack into geoserver.
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