另存为png时，jfree条形图的域轴像素损坏

Question

创建jfree条形图另存为png格式时，域轴标签字体损坏并且图像质量也不佳。

BufferedImage bufferedImage = barChart.createBufferedImage(350, 350);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "png", baos);
baos.flush();
byte[] imageInByte = baos.toByteArray();
baos.close();
request.setAttribute("image", imageInByte);
request.getRequestDispatcher("/freeChart.jsp").forward(request, response);