Tag lifecycle with Attribute : Tag « JSP « Java

Tag lifecycle with Attribute

  <!-- this must be added to the web application's web.xml -->


// create File:java2s.tld in the /WEB-INF/
<!DOCTYPE taglib
  PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"

    <!-- a tab library descriptor -->
<taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
  <short-name>Java2s Simple Tags</short-name>

  <!-- a tag that outputs information when different methods are called -->

//compile the following code into WEB-INF\classes\com\java2s
package com.java2s;

import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;

/* This tag handler outputs information about when different methods
   are called in the Tag interface.

public class TagLifecycle extends TagSupport
  // Constructor

  public TagLifecycle()
    System.out.println("TagLifecycle constructor called");

  // Methods inherited from TagSupport

  public void setPageContext(PageContext p)
    System.out.println("setPageContext() called (" + p + ")");
  public void setParent(Tag t)
    System.out.println("setParent() called (" + t + ")");

  public Tag getParent()
    System.out.println("getParent() called");
    return super.getParent();
  public void release()
    System.out.println("release() called");
  // Code to implement the "attr1" attribute

  private String attr1;
  public String getAttr1()
    return attr1;
  public void setAttr1(String s)
    System.out.println("setAttr1() called with value " + s);
    attr1 = s;

  // Code to implement the "attr2" attribute

  private String attr2;
  public String getAttr2()
    return attr2;
  public void setAttr2(String s)
    System.out.println("setAttr2() called with value " + s);
    attr2 = s;

  public int doStartTag() throws JspException
    System.out.println("doStartTag() called");

    return SKIP_BODY;

  public int doEndTag() throws JspException
    System.out.println("doEndTag() called");
    return super.doEndTag();

// start comcat and load the following jsp page in browser
<%@ taglib uri="/java2s" prefix="java2s" %>

    <title>The lifecycle of the Tag interface</title>
    <java2s:tagLifecycle attr1="Joe" attr2="Greenhough" />
    <java2s:tagLifecycle attr1="Rob" attr2="Greenhough" />

    Check the Tomcat console for the output


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