如何在servlet中显示图片

Question

HttpServletRequest req;
HttpServletResponse res;
Frame frame=new Frame();
Graphics g=null;
ServletOutputStream out=res.getOutputStream();
frame.addNotify();
Image image=frame.createImage(400,60);
g=image.getGraphics();
g.setFont(new Font("Serif",Font.ITALIC,48));
g.drawString("Hello World!",10,50);
res.setContentType("image/gif");
然后怎么将Hello World这个图像在servlet中输出.

Answer 1

public class CreateImageServlet extends HttpServlet {
    private Graphics2D g2 = null;    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response) throws ServletException,
            IOException {
        response.setContentType("image/jpeg");
        createImage(response.getOutputStream());
    }    private void createImage(OutputStream out) throws IOException {
        Image image1;
       
        int width = 800;
        int height = 600;
               BufferedImage bi = new BufferedImage(width, height,
                                             BufferedImage.TYPE_INT_RGB);
        g2 = bi.createGraphics();
URL urlPic = new URL("http://www.yxdown.com/uploadImages/920467_20040817_screen001.jpg");        Image image1 = Toolkit.getDefaultToolkit().getImage(urlPic);
        g2.drawImage(image1, 0, 0, 800, 600, null);
                               g2.dispose();
        bi.flush();        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
        param.setQuality(1.0f, false);
        encoder.setJPEGEncodeParam(param);
       
        try {
            encoder.encode(bi);
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}

Answer 2

记得好象可以用BufferdeImage类，然后创建一对象，从它获取Graphics2D，设置具体画图元素，输出时用ImageIO.writer(BufferedImage image,String pictureType,OutputStream out)。

Answer 3

to bbx911(穿着皮夹克的山顶洞人) 
太强了,马上结帐