appletviewer

Section: User Commands (1)
Updated: 23 Apr 2001
 

NAME

appletviewer - Java applet viewer  

SYNOPSIS

appletviewer [ -debug ] [ -encoding encoding_name ]
      [ -J javaoption ] urls ...  

DESCRIPTION

The appletviewer command runs Java applets outside of the context of a World Wide Web browser.

The appletviewer command connects to the document(s) or resource(s) designated by urls and displays each applet referenced by that document in its own window. Please note that if the documents referred to by urls do not reference any applets with the OBJECT, EMBED, or APPLET tag, appletviewer does nothing.  

appletviewer Tags

The appletviewer makes it possible to run a Java applet without using a browser. appletviewer ignores any HTML that is not immediately relevant to launching an applet. However, it recognizes a wide variety of applet-launching syntax. The HTML code that appletviewer recognizes is shown below. All other HTML code is ignored.
object
The object tag is the HTML 4.0 tag for embedding applets and mult-media objects into an HTML page. It is also an Internet Explorer 4.x extension to HTML 3.2 which allows IE to run a Java applet using the latest Java plugin from Sun. 

 <object
   width="pixelWidth"
   height="pixelHeight"
 >
   <param name="code" value="yourClass.class">
   <param name="object" value="serializedObjectOrJavaBean">
   <param name="codebase" value="classFileDirectory">
   ...
   alternate-text
</object>

Please note:

*
appletviewer ignores the "classID" attribute, on the assumption that it is pointing to the Java plugin, with the value: 

classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
*
appletviewer also ignores the "codebase" attribute that is usually included as part of the object tag, assuming that it points to a Java plugin in a network cab file with a value like: 

codebase="http://java.sun.com/products/plugin/1.1/jinstall-11.cab#Version=1,1,0,0"
*
The optional codebase param tag supplies a relative URL that specifies the location of the applet class.
*
Either code or object is specified, not both.
*
The type param tag is not used by appletviewer, but should be present so that browsers load the plugin properly. For an applet, the value should be something like: 

  <param name="type"
  value="application/x-java-applet;version=1.1">

or 

  <param name="type" value="application/x-java-applet">

For a serialized object or JavaBean, the type param value should be something like: 

  <param name="type"
   value="application/x-java-bean;version=1.1">

or 

  <param name="type" value="application/x-java-bean">
*
Other param tags are argument values supplied to the applet.
*
The object tag recognized by IE4.x and the embed tag recognized by Netscape 4.x can be combined so that an applet can use the latest Java plugin from Sun, regardless of the browser that downloads the applet.
*
appletviewer does not recognize the java_code, java_codebase, java_object, or java_type param tags. These tags are only needed when the applet defines parameters with the names code, codebase, object, or type, respectively. (In that situation, the plugin recognizes and uses the java_ version in preference to the version that will be used by the applet.) If the applet requires a parameter with one of these 4 names, it may not run in appletviewer.
embed
The embed tag is the Netscape extension to HTML 3.2 that allows embedding an applet or a multimedia object in an HTML page. It allows a Netscape 4.x browser (which supports HTML 3.2) to run a Java applet using the latest Java plugin from Sun. 

  <embed
    code="yourClass.class"
    object="serializedObjectOrJavaBean"
    codebase="classFileDirectory"
    width="pixelWidth"
    height="pixelHeight"
  >
  ...
  </embed>
Please note that:
*
The object and embed tags can be combined so that an applet can use the latest Java plugin from Sun, regardless of the browser that downloads the applet. For more information, see the Java PlugIn HTML Specification
*
Unlike the object tag, all values specified in an embed tag are attributes (part of the tag) rather than parameters (between the start tag and end tag, specified with a param tag.
*
To supply argument values for applet parameters, you add additional attributes to the <embed> tag.
*
appletviewer ignores the "src" attribute that is usually part of an <embed> tag.
*
Either code or object is specified, not both.
*
The optional codebase attribute supplies a relative URL that specifies the location of the applet class.
*
The type attribute is not used by appletviewer, but should be present so that browsers load the plugin properly. For an applet, the value should be something like: 
  <type="application/x-java-applet;version=1.1">...

or 

  <type="application/x-java-applet">...
For a serialized object or JavaBean, the type param value should be something like: 

  <type="application/x-java-bean;version=1.1">...

or 

  <type="application/x-java-bean">...
*
The pluginspage attribute is not used by appletviewer, but should be present so that browsers load the plugin properly. It should point to a Java plugin in a network cab file with a value like: 

pluginspage="http://java.sun.com/products/plugin/1.1/jinstall-11.cab#Version=1,1,0,0"
applet
The applet tag is the original HTML 3.2 tag for embedding an applet in an HTML page. Applets loaded using the applet tag are run by the browser, which may not be using the latest version of the Java platform. To ensure that the applet runs with the latest version, use the object tag to load the Java plugin into the browser. The plugin will then run the applet. 

  <applet
    code="yourClass.class"
    object="serializedObjectOrJavaBean"
    codebase="classFileDirectory"
    width="pixelWidth"
    height="pixelHeight"
  >
    <param name="..." value="...">
    ...
    alternate-text
  </applet>
Please note that:
*
Either code or object is specified, not both.
*
The optional codebase attribute supplies a relative URL that specifies the location of the applet class.
*
param tags supply argument values for applet parameters.
app
The app tag was a short-lived abbreviation for applet that is no longer supported. appletviewer translates the tag and prints out an equivalent tag that is supported. 

  <app
    class="classFileName" (without a .class suffix)
    src="classFileDirectory"
    width="pixelWidth"
    height="pixelHeight"
  >
    <param name="..." value="...">
    ...
  </app>
 

OPTIONS

The following options are supported:
-debug
Starts the applet viewer in the Java debugger, which debugs applets in the document. (See jdb(1).)
-encoding encoding_name
Specifies the input HTML file encoding name.
-J javaoption
Passes the string javaoption through as a single argument to java(1) which runs the compiler. The argument should not contain spaces. Multiple argument words must all begin with the prefix -J, which is stripped. This is useful for adjusting the execution environment or compiler memory usage.
 

SEE ALSO

For more information, see

http://java.sun.com/j2se/1.4/docs/guide/plugin/developer_guide/

or search www.java.sun.com for "Java PlugIn HTML Specification"

 

Index

NAME
SYNOPSIS
DESCRIPTION
appletviewer Tags
OPTIONS
SEE ALSO