typo.java

使用servlet开发的动态生成GIF图像

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import Acme.JPM.Encoders.GifEncoder;

/**
 * Typo.
 * @version    1.0
 * @author	   S.H.
 * @company    JavaZOOM.
 * @date       01/2000.
 *
 * Use of this source and binary code is permitted only for non-commercial purposes.
 * Modification is allowed with this copyright notice and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
public class typo extends HttpServlet
{

  public static final String 	PATH="";
  private fontgrabber			_fg = null;
  private fontinfo				_fi = null;
  private GifEncoder 			_gifEncoder = null;

  /**
   * Service
   * Handles GET request-response
   * @param    HttpServletRequest, HttpServletResponse
   */
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
  {
    res.setContentType("image/gif");
    ServletOutputStream out=res.getOutputStream();
    String fontName = req.getParameter("font");
    String text = req.getParameter("text");
    if ((text != null) && (fontName != null) && (!fontName.equals("")) && (!text.equals("")))
    {
		String Error = null;
		Error = readBitmap(PATH+fontName+".ffi");
		if (Error == null)
		{
			//Transparent => color < 0x08000000
			_fg = new fontgrabber(_fi, text.toUpperCase(), 0x07000000);
    		_gifEncoder=new GifEncoder(_fg.getImageProd(),out);
    		_gifEncoder.encode();
		}
		else out.println();
	}
	else out.println();
  }

  /**
   * Reads Bitmap and font descriptor.
   */
  private String readBitmap(String fn)
  {
	/*-- Load font descriptor --*/
	FileInputStream fis = null;
	ObjectInputStream ois = null;
	try
	{
		fis = new FileInputStream(fn);
		ois = new ObjectInputStream(fis);
		_fi = (fontinfo)ois.readObject();
		ois.close();
		fis.close();
	} catch (Exception e)
	  {
		  return "Cannot load font descriptor !";
  	  }
	return null;
  }
}