JSP programming (II)-Basic JSP syntax (10)-JSP: plugin

Execute an applet or bean. If possible, download a Java Plug-in to execute it.

JSP syntax

<JSP: plugin

Type = "bean | applet"

Code ="Classfilename"

Codebase ="Classfiledirectoryname"

[Name ="InstanceName"]

[Archive ="Uritoarchive,... "]

[Align ="Bottom| Top | Middle | left | right "]

[Height ="Displaypixels"]

[Width ="Displaypixels"]

[Hspace ="Leftrightpixels"]

[Vspace ="Topbottompixels"]

[Jreversion ="Jreversionnumber|1.1"]

[Nspluginurl ="Urltoplugin"]

[Iepluginurl ="Urltoplugin"]>

 

[<JSP: Params>

[<JSP: Param name ="Parametername"

Value = "{Parametervalue| <% =Expression% >}"/>] +

</Jsp: Params>]

[<JSP: fallback>Text message for user</Jsp: fallback>]

</Jsp: plugin>

 

Example

 

<JSP: plugin type = applet code = "molecule. Class" codebase = "/html">

<JSP: Params>

<JSP: Param name = "molecule" value = "molecules/benzene. mol"/>

</Jsp: Params>

<JSP: fallback>

<P> unable to load applet </P>

</Jsp: fallback>

</Jsp: plugin>

 

Description

 

<JSP: plugin> elements are used to play or display an object (typically an applet and bean) in a browser, and such display needs to be implemented in the browser's Java Plug-in.

When the JSP file is compiled and sent to the browser, the <JSP: plugin> element will be replaced with the <Object> or <embed> element based on the browser version. Note: <Object> is used for HTML 4.0 and <embed> for HTML 3.2.

In general, the <JSP: plugin> element specifies whether the object is an applet or bean, the class name, location, and where to download the Java Plug-in. The details are as follows:

 

Attribute

• Type = "bean | applet"

  . Type of the plug-in object to be executed. You must specify the bean or applet, because this property has no default value.

• Code ="Classfilename"

  The name of the Java class to be executed by the Java Plug-in. It must end with. Class. This file must exist in the directory specified by the codebase attribute.

• Codebase ="Classfiledirectoryname"

  The directory (or path) of the Java class file to be executed. If you do not provide this attribute, the Directory of the JSP file using <JSP: plugin> will be used.

• Name ="InstanceName"

  The name of the bean or applet instance, which will be called elsewhere in JSP.

• Archive ="Uritoarchive,..."

  Some path names separated by commas (,) are used to pre-install the classes to be used, which improves the applet performance.

• Align ="Bottom| Top | Middle | left | right"

  The position of the image, object, and Applet has the following values:

  • bottom
  • top
  • middle
  • left
  • right
• Height ="Displaypixels"Width ="Displaypixels"

  The length and width that the applet or bean will display. The value is a number in pixels.

• Hspace ="Leftrightpixels"Vspace ="Topbottompixels"

  When the applet or bean is displayed on the left and right of the screen, the space left up and down is measured in pixels.

• Jreversion ="Jreversionnumber|1.1"

  The Java Runtime Environment (JRE) version required for running the applet or bean.

  The default value is 1.1.

• Nspluginurl ="Urltoplugin"

  The JRE that Netscape Navigator users can use, which is a standard URL such as a http://www.aspcn.com/jsp

• Iepluginurl ="Urltoplugin"

  IE users can use JRE, this value is a standard URL, such as http://www.aspcn.com/jsp

• <JSP: Params> [<JSP: Param name ="Parametername"

  Value = "{Parametervalue| <% =Expression% >}"/>] + </Jsp: Params>

  The parameter or parameter value that you need to transmit to the applet or bean.

• <JSP: fallback>Text message for user</Jsp: fallback>

  A piece of text is used in Java

  The plug-in cannot be displayed to the user when it is started. If the plug-in can be started but the applet or bean cannot, an error message will pop up in the browser.