Running a Java applet on a website

问题

I have created a Java game using Eclipse. It has 11 classes (with one main class that calls everything else). I called it as an applet in the following manner:

<!-- This is the applet handler to load the Handler Class to run the game -->
<td colspan="3"><applet code="Handler.class" codebase="History Adventure Alamo Adventure/" name="Alamo Battle Adventure" width="680" height="509" archive="Handler.jar" id="Alamo Battle Adventure">
</applet></td>

With it uploaded to the website, it shows an error and tells me to click for details. When I select it, it tells me ClassNotFoundException: Handler.class

The code is in the body and I have nothing in the head. What have I done wrong?

Here is the rest of my code for the page. The actual test page can be found at www.kluckhohndesign.com

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<script language="javascript" type="text/javascript">
<!--
function popitup(url) {
    newwindow=window.open(url,'name','height=510,width=500');
    if (window.focus) {newwindow.focus()}
    return false;
}

// -->
</script>

<title>Alamo Battle Adventure</title>
</head>

<body>
<blockquote>&nbsp;</blockquote>
<table width="1300" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td width="318" height="160">&nbsp;</td>
    <td colspan="3"><img src="Alamo Battle Adventure.jpg" width="680" height="160" alt="Top Banner" /></td>
    <td width="318">&nbsp;</td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td width="226"><a href="howtoplay.html" onclick="return popitup('howtoplay.html')"><img src="How to Play.jpg" width="226" height="52" alt="How to Play" /></a></td>
    <td width="226">&nbsp;</td>
    <td width="227"><a href="Help.html" onclick="return popitup('help.html')"><img src="help.jpg" width="226" height="52" alt="Help" /></a></td>
    <td>&nbsp;</td>
  <tr>
    <td><img src="Alamo Pencil.jpg" width="318" height="250" alt="Alamo Drawing" /></td>
<!-- This is the applet handler to load the Handler Class to run the game -->
    <td colspan="3"><applet code="Handler.jar" codebase="History Adventure Alamo Adventure/" name="Alamo Battle Adventure" width="680" height="509" archive="Handler.jar" id="Alamo Battle Adventure" />
    </applet></td>
    <td><img src="texans.jpg" width="318" height="250" alt="Texans Drawing" /></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="3">&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="3">&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table>
</body>
</html>

回答1:

This should get you further:

<html>
<body>
<applet
    code="Handler"
    codebase="http://www.kluckhohndesign.com/History%20Adventure%20Alamo%20Adventure/"
    name="Alamo Battle Adventure"
    width="680"
    height="509"
    archive="Handler.jar"
    id="Alamo Battle Adventure" >
</applet>
</body>
</html>

You can leave out the http://www.kluckhohndesign.com/ prefix on the codebase.

Now it causes an InvocationTargetException. But ask a new question about that.

Further notes

The code attribute should be the fully qualified name of the class & has nothing to do with the Jar. Most people think FQN equates to Handler.class but it actually means just Handler.
The codebase can be simply History%20Adventure%20Alamo%20Adventure/ if it is coming off your site. It needs the %20 for spaces, as spaces are not valid in an URL. Then again, most deployers would not use directory names with spaces at all, for that very reason.
The applet element was never meant to be 'self closed' as was shown in your original page. Instead it needs an explicit </applet> closing element.
Please keep testing in the simpler page I suggested, without all that other cruft.

来源：https://stackoverflow.com/questions/16283437/running-a-java-applet-on-a-website

标签

java

html

eclipse

applet