Jsp2 custom tag

Jsp2 custom tag

To open a custom tag in jsp:

1. Development of custom tag processing class

2. Create a *. tid file. Each tld tag corresponds to a tag library, and each tag library corresponds to multiple tags.

3. Use tags in jsp

* *** Precautions for developing custom tag classes:

1. The custom label class should inherit a parent class javax. servlet. jsp. tagext. SimpleTagSupport

2. If the custom label class contains attributes, each attribute should have the corresponding getter/setter method.

3. Override the doTag () method. This method is used to generate page content.

Example:

Public class HelloWorldTag extends simpleTagSupprt {

// Rewrite the doTag () method

Public void doTag () throws JspException, IoException {

This. getJspContext (). getOut (). write ("Hello World" + new Date ())

}

}

* *** Create a TLD tag

TLD is the abbreviation of Tag Library Definition, that is, Tag Library Definition.

We can copy a file template \ webapps \ examples \ WEB_INF \ jsp2 in tomcat contains a jsp2-example-taglib.tld

Copy the file to the web application's WEB-INF path and make simple modifications

Example:

Root Node:

Tag:

* *** Use tags <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + signature + MqGkILHqx6nD + signature + PGJyPgo8L3A + CjxwPsq508Ox6sepv + signature + MaGkILW8yOux6sepv + signature/Signature "http://tomcat.apache.org/debug-taglib" prefix = "mytag" %>

Uri: The uri of the tag library.

Prefix: short name

2. Use tags; use custom tags in jsp

Because of

TAGDEPENDENT Empty TAG body defined

We only need to call:

Prefix + Tag Name