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发信人: icefire (as you wish), 信区: Java
标  题: JAVA编写的CGI--热烈欢迎
发信站: BBS 荔园晨风站 (Tue Dec  1 23:03:01 1998), 站内信件 (WWW POST)

发信人: wooce (残雪), 信区: CGI
标  题: JAVA编写的CGI--热烈欢迎greetings.java
发信站: 华南网木棉站 (Tue Dec  1 20:25:18 1998), 转信

/*
* greetings.java - 12 Jun 1996 - Version 2.0
*(formerly javex.java)
*
* Copyright 1996 by Bill Giel
*
* E-mail: rvdi@usa.nai.net
* WWW: http://www.nai.net/~rvdi/home.htm
*
*
* Revision 2.0 - Added background and text colors, and custom text
* 12 Jun 96 parameters. Overrode reshape to handle resize, (even
* though applets cannot be resized in a browser, they
* can in the appletviewer.)
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and
* without fee is hereby granted, provided that any use properly credits
* the author, i.e. "Greetings applet courtesy of <A
HREF="mailto:rvdi@usa.nai.net">
* Bill Giel</A>.
*
*
* THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
* OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE
* FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*
*/

import java.applet.*;
import java.awt.*;
import java.net.*;

public class greetings extends Applet
{

int fontHeight;
String displayString=null;
Color bgColor, textColor;

//Applet name, author and info lines
public String getAppletInfo()
{
return "Greetings Applet (C) 1996 by Bill Giel<rvdi@usa.nai.net>";
}

//Users' parameters - self-explanatory?
public String[][] getParameterInfo()
{
String[][] info = {
{"width", "int", "width of the applet, in pixels"},
{"height", "int", "height of the applet, in pixels"},
{"bgColor", "string", "hex color triplet of the background, i.e. FFFFFF for
white <white>"},
{"textColor", "string", "hex color triplet of text, i.e. 000000 for black
<black>"},
{"unknown_visitor","string","text to display for unknown host <Welcome!>"},
{"greetings_text", "string","text to display with host name, no space at end
<Greetings to>"}
};
return info;
}

private Color parseColorString(String colorString)
{
if(colorString.length()==6){
int R = Integer.valueOf(colorString.substring(0,2),16).intValue();
int G = Integer.valueOf(colorString.substring(2,4),16).intValue();
int B = Integer.valueOf(colorString.substring(4,6),16).intValue();
return new Color(R,G,B);
}
else return Color.lightGray;
}

public void init()
{

String mysteryGuest = getParameter("UNKNOWN_VISITOR");
if(null == mysteryGuest)
mysteryGuest= "Welcome!";

displayString = getParameter("GREETINGS_TEXT");
if(null == displayString)
displayString="Greetings to";

String param = getParameter("BGCOLOR");
if(null == param)
bgColor=Color.white;
else
bgColor=parseColorString(param);

param = getParameter("TEXTCOLOR");
if(null == param)
textColor=Color.black;
else
textColor=parseColorString(param);

try{
InetAddress thisAddress = InetAddress.getLocalHost();
displayString += " " + thisAddress.getHostName().toUpperCase() +" !";
}catch(Exception e){
displayString=mysteryGuest;
}

fontHeight=size().height;

System.out.println(getAppletInfo());
}

public void reshape(int x, int y, int width, int height)
{
super.reshape(x,y,width,height);
fontHeight=height;
}

public void paint(Graphics g)
{
FontMetrics fm;

g.setColor(bgColor);
g.fillRect(0,0,size().width,size().height);
g.setColor(textColor);

do{
g.setFont(new Font("TimesRoman",Font.BOLD,fontHeight));
fm=g.getFontMetrics();
if(fm.stringWidth(displayString)>size().width)fontHeight-=2;

}while(fm.stringWidth(displayString)>size().width);
g.drawString(displayString,(size().width-fm.stringWidth(displayString))/2,size()
.height-fm.getMaxDescent());

}
}

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