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CategoryPlot plot = chart.getCategoryPlot();
plot.setNoDataMessage("NO Data");
plot.setNoDataMessagePaint(Color.RED);
//背景色
plot.setBackgroundPaint(Color.PINK);
//设置网格线是否显示
plot.setRangeCrosshairVisible(false);
//绘图区域绘图数据点可见通过Renderer
LineAndShapeRenderer render = (LineAndShapeRenderer) plot.getRenderer();
render.setBaseShapesVisible(true);