执行下面的一段代码。向Session中保存用户名信息为什么不成功？

public class Demo01 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage image = new BufferedImage(50, 20,BufferedImage.TYPE_INT_ARGB );
Graphics g = image.getGraphics();
g.drawString("1A2B", 20, 5);

ImageIO.write(image, "JPG", response.getOutputStream());
HttpSession hs = request.getSession();
hs.setAttribute("用户名", "杰克");
}
}

用户名换成英文再试试

支持一下感觉挺不错的

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