To embed an applet within a web page, you must use an appropriate set of HTML tags:
Here's the HTML for a very simple web page
with an embedded applet:
<html>
<head>
<title>I'm a Java-enabled Web Page!</title>
</head>
<body>
Here's the Java applet:
<applet code="MyApplet.class"
width="300"
height="200"
>
Sorry, you're out of luck!
Your browser doesn't support Java.
</applet>
</body>
</html>
As you can see, there's a single tag, <applet> ...
</applet> which has a
number of attributes that can be specified.
Here are the named attributes for the <applet> tag for
JDK 1.0.x:
| Attribute name |
Required? |
Description |
CODE="foo.class" |
Yes |
Specifies the name of
the applet's .class file. |
WIDTH=pixels |
Yes |
Specifies the width of
the applet window |
HEIGHT=pixels |
Yes |
Specifies the height of
the applet window |
CODEBASE="path" |
No |
Specifies where to find
the .class files, relative to the location of the
enclosing HTML page. |
NAME="applet-name" |
No |
Specifies the name of the applet (used to
distinguish it from other applets on the same page). |
ALIGN=LEFT |
No |
Places the applet at the
left margin of the page. Text that follows goes in
the space to the right of the applet. |
ALIGN=RIGHT |
No |
Places the applet at the
right margin of the page. Text that follows goes in
the space to the left of the applet |
ALIGN=BOTTOM |
No |
Places the bottom of the
applet at the bottom of the text in the current line. |
ALIGN=TOP |
No |
Places the top of the
applet with the top of the current line. |
ALIGN=TEXTTOP |
No |
Places the top of the
applet with the top of the text in the current line. |
ALIGN=MIDDLE |
No |
Places the middle of the
applet with the baseline of the current line. |
ALIGN=ABSMIDDLE |
No |
Places the middle of the
applet with the middle of the current line. |
ALIGN=BASELINE |
No |
Places the bottom of the
applet with the baseline of the current line. |
ALIGN=ABSBOTTOM |
No |
Places the bottom of the
applet with the bottom of the current line. |
VSPACE=pixels |
No |
Creates a vertical
margin around the applet . |
HSPACE=pixels |
No |
Creates a horizontal margin around the applet. |
Here are the <applet> tag attributes added for JDK 1.1.x:
| Attribute name |
Required? |
Description |
ARCHIVE="jar-file" |
No |
Specifies the name of a Java archive
(JAR) file that contain classes and other resources
for the applet. |
OBJECT="obj-file" |
No |
Specifies the name of a file that
contains the serialized applet object. |
Adding Package and Directory Specifications
The above HTML example is very basic:
- It specifies an applet whose
.class file is in the same directory as its
enclosing HTML page file.
- The class whose
.class file is being used is in the default
package.
Think of the CODEBASE attribute as specifying a kind of
CLASSPATH
for the applet. The same kind of rules apply to
applets as apply to applications, when you start dealing with
classes within packages.
To specify an applet whose .class file is in subdirectory classes, and whose class is in the default package:
<html>
<head>
<title>I'm a Java-enabled Web Page!</title>
</head>
<body>
Here's the Java applet:
<applet code="MyApplet.class"
codebase="classes"
width="300"
height="200"
>
Sorry, you're out of luck!
Your browser doesn't support Java.
</applet>
</body>
</html>
To specify an applet whose class is in the package myPackage:
<html>
<head>
<title>I'm a Java-enabled Web Page!</title>
</head>
<body>
Here's the Java applet:
<applet code="myPackage.MyApplet.class"
codebase="classes"
width="300"
height="200"
>
Sorry, you're out of luck!
Your browser doesn't support Java.
</applet>
</body>
</html>
and the .class file must be
in subdirectory below where the document is:
classes/myPackage
| 