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7.5 Using Servlets to Generate GIF Images

171

Listing 7.8  ShadowedText.java (continued)

      message = "Missing 'message' parameter";

    }

    String fontName = request.getParameter("fontName");

    if (fontName == null) {

      fontName = "Serif";

    }

    String fontSizeString = request.getParameter("fontSize");

    int fontSize;

    try {

      fontSize = Integer.parseInt(fontSizeString);

    } catch(NumberFormatException nfe) {

      fontSize = 90;

    }

    response.setContentType("image/gif");

    OutputStream out = response.getOutputStream();

    Image messageImage =

      MessageImage.makeMessageImage(message,

                                    fontName,

                                    fontSize);

    MessageImage.sendAsGIF(messageImage, out);

  }

  /** Allow form to send data via either GET or POST. */

  public void doPost(HttpServletRequest request,

                     HttpServletResponse response)

      throws ServletException, IOException {

    doGet(request, response);

  }

}

Listing 7.9  MessageImage.java 

package coreservlets;

import java.awt.*;

import java.awt.geom.*;

import java.io.*;

import Acme.JPM.Encoders.GifEncoder;

/** Utilities for building images showing shadowed messages.

 *  Includes a routine that uses Jef Poskanzer's GifEncoder

 *  to return the result as a GIF.

 *  

 *  Does not run in JDK 1.1, since it relies on Java2D

 *  

 */

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

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