shadowedtext.java

来自「servletjsp一些应用程序」· Java 代码 · 共 71 行

JAVA

71 行

package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;

/** Servlet that generates JPEG images representing
 *  a designated message with an oblique shadowed
 *  version behind it.
 *  <P>
 *  Taken from Core Servlets and JavaServer Pages 2nd Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  http://www.coreservlets.com/.
 *  &copy; 2003 Marty Hall; may be freely used or adapted.
 */

public class ShadowedText extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    String wantsList = request.getParameter("showList");
    if (wantsList != null) {
      showFontList(response);
    } else {
      String message = request.getParameter("message");
      if ((message == null) || (message.length() == 0)) {
        message = "Missing 'message' parameter";
      }
      String fontName = request.getParameter("fontName");
      if ((fontName == null) || (fontName.length() == 0)) {
        fontName = "Serif";
      }
      String fontSizeString = request.getParameter("fontSize");
      int fontSize;
      try {
        fontSize = Integer.parseInt(fontSizeString);
      } catch(NumberFormatException nfe) {
        fontSize = 90;
      }
      response.setContentType("image/jpeg");
      MessageImage.writeJPEG
        (MessageImage.makeMessageImage(message,
                                       fontName,
                                       fontSize),
         response.getOutputStream());
    }
  }

  private void showFontList(HttpServletResponse response)
      throws IOException {
    PrintWriter out = response.getWriter();
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
      "Transitional//EN\">\n";
    String title = "Fonts Available on Server";
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1 ALIGN=CENTER>" + title + "</H1>\n" +
                "<UL>");
    String[] fontNames = MessageImage.getFontNames();
    for(int i=0; i<fontNames.length; i++) {
      out.println("  <LI>" + fontNames[i]);
    }
    out.println("</UL>\n" +
                "</BODY></HTML>");
  }
}

shadowedtext.java - 源码说明

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