{"id":1724,"date":"2011-03-17T17:56:09","date_gmt":"2011-03-17T12:26:09","guid":{"rendered":"http:\/\/JitendraZaa.com\/blog\/?p=1724"},"modified":"2011-03-17T17:56:09","modified_gmt":"2011-03-17T12:26:09","slug":"how-to-create-jsp-custom-tag-using-bodytag-interface-or-bodytagsupport","status":"publish","type":"post","link":"https:\/\/www.jitendrazaa.com\/blog\/java\/how-to-create-jsp-custom-tag-using-bodytag-interface-or-bodytagsupport\/","title":{"rendered":"How to Create JSP Custom Tag \u2013 using BodyTag interface or BodyTagSupport"},"content":{"rendered":"

In Previous articles, i have explained:<\/p>\n

Life Cycle of JSP “Tag” interface.<\/a><\/p>\n

Life Cycle of JSP “BodyTag” interface<\/a>.<\/p>\n

How to Create JSP Custom Tag \u2013 using Tag interface or TagSupport<\/a><\/p>\n

we have seen that how to create the custom JSP tag using interface “Tag”\u009d, means tags which does not have a body. In this article, I will explain creating custom Tags which have a body.\u00a0We can manipulate the content of body as we want.<\/p>\n

\"How<\/a>
How to Create Custom Tag in JSP<\/figcaption><\/figure>\n

<\/p>\n

So, create a class which implements interface “BodyTag<\/strong>“\u009d, in this article also I am not going to use Support classes. As it will not clear the basic idea.<\/p>\n

\npackage com.G2.CustomTag;\n\nimport java.io.IOException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\nimport javax.servlet.jsp.JspException;\nimport javax.servlet.jsp.JspWriter;\nimport javax.servlet.jsp.PageContext;\nimport javax.servlet.jsp.tagext.BodyContent;\nimport javax.servlet.jsp.tagext.BodyTag;\nimport javax.servlet.jsp.tagext.Tag;\n\npublic class DisplayDateBody implements BodyTag {\n\tprivate PageContext pc = null;\n\tprivate Tag parent = null;\n\tprivate BodyContent bd = null;\n\tprivate boolean showInUpperCase;\n\n\tpublic boolean isShowInUpperCase() {\n\t\treturn showInUpperCase;\n\t}\n\n\tpublic void setShowInUpperCase(boolean showInUpperCase) {\n\t\tthis.showInUpperCase = showInUpperCase;\n\t}\n\n\t@Override\n\tpublic void doInitBody() throws JspException {\n\n\t}\n\n\t@Override\n\tpublic void setBodyContent(BodyContent arg0) {\n\t\tbd = arg0;\n\n\t}\n\n\t@Override\n\tpublic int doAfterBody() {\n\t\ttry {\n\t\t\tString bodyString = bd.getString();\n\t\t\tJspWriter out = bd.getEnclosingWriter();\n\t\t\tSimpleDateFormat frm = new SimpleDateFormat("dd-MMM-yyy EEEE");\n\t\t\tif(showInUpperCase)\n\t\t\t{\n\t\t\t\tout.print((bodyString + frm.format(new Date())).toUpperCase());\n\t\t\t}else{\n\t\t\t\tout.print((bodyString + frm.format(new Date())).toLowerCase());\n\t\t\t}\n\t\t\tbd.clear(); \/\/ empty buffer for next evaluation\n\t\t} catch (IOException e) {\n\t\t\tSystem.out.println("Error in BodyContentTag.doAfterBody()" + e.getMessage());\n\t\t\te.printStackTrace();\n\t\t} \/\/ end of catch\n\n\t\treturn SKIP_BODY;\n\t}\n\n\t@Override\n\tpublic int doEndTag() throws JspException {\n\t\treturn EVAL_PAGE;\n\t}\n\n\t@Override\n\tpublic int doStartTag() throws JspException {\n\t\treturn EVAL_BODY_AGAIN;\n\t}\n\n\t@Override\n\tpublic Tag getParent() {\n\t\treturn parent;\n\t}\n\n\t@Override\n\tpublic void release() {\n\t\tpc = null;\n\t\tparent = null;\n\n\t}\n\n\t@Override\n\tpublic void setPageContext(PageContext arg0) {\n\t\tpc = arg0;\n\t}\n\n\t@Override\n\tpublic void setParent(Tag arg0) {\n\t\tparent = arg0;\n\t}\n\n}\n<\/pre>\n
As per discussed in life cycle of BodtTag interface, two extra method is added to evaluate the body content of the tag.
\nNow create  tld file in “WEB-INF\/tlds”\u009d folder as shown below:<\/p>\n
\n<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE taglib PUBLIC "-\/\/Sun Microsystems, Inc.\/\/DTD JSP Tag Library 1.1\/\/EN"\n"http:\/\/java.sun.com\/j2ee\/dtds\/web-jsptaglibrary_1_1.dtd">\n<taglib>\n\t<tlibversion>1.0.0<\/tlibversion>\n\t<jspversion>1.1<\/jspversion>\n\t<shortname>CustomTag<\/shortname>\n\t<uri>https:\/\/jitendrazaa.com\/blog<\/uri>\n\t<info>Custom tags<\/info>\n\n\t<tag>\n\t\t<name>ShowDateWithCase<\/name>\n\t\t<tagclass>com.G2.CustomTag.DisplayDateBody<\/tagclass>\n\t\t<info>Custom tag used to display the current date with option to choose uppercase<\/info>\n\t\t<attribute>\n\t\t\t<name>showInUpperCase<\/name>\n\t\t\t<required>true<\/required>\n\t\t<\/attribute>\n\t<\/tag>\n\n<\/taglib>\n<\/pre>\n
Note here that attribute  empty<\/em> used in previous article is not used here, as we have bodycontent here, so it cannot be left blank.<\/p>\n
Now create JSP page:<\/p>\n
\n<%@ page language="java" contentType="text\/html; charset=ISO-8859-1"\n\tpageEncoding="ISO-8859-1"%>\n<%@taglib uri="\/WEB-INF\/tlds\/CustomTags.tld" prefix="ct"%>\n<!DOCTYPE html PUBLIC "-\/\/W3C\/\/DTD HTML 4.01 Transitional\/\/EN" "http:\/\/www.w3.org\/TR\/html4\/loose.dtd">\n<html>\n<head>\n<meta http-equiv="Content-Type" content="text\/html; charset=ISO-8859-1">\n<title>Custom Tag<\/title>\n<\/head>\n<body>\n<h2>Custom tag to display date<\/h2>\n<ct:ShowDateWithCase showInUpperCase="true">\nCurrent Date is\n<\/ct:ShowDateWithCase>\n<\/body>\n<\/html>\n<\/pre>\n
We can also add the loop functionality<\/strong> in our code, what we have to do additionally is:<\/p>\n
    \n
  1. Add one more attribute in tag library descriptor (tld) file.<\/li>\n
  2. Create getter and setter for that attribute in Tag handler class.<\/li>\n
  3. Add one more variable counter in tag handler class.<\/li>\n
  4. initialize that variable in method doStartTag(), doInitBody() or any other setter of attribute.<\/li>\n
  5. in method doAfterBody(), check the condition if counter<loopcounter then return “EVAL_BODY_BUFFERED” else return “SKIP_BODY”. \u00a0EVAL_BODY_BUFFERED will tell the page compiler that eval that body again until the “SKIP_BODY” returned by the method.<\/li>\n<\/ol>\n
    Please leave your comment for any suggestion or queries.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Tutorial on How to Create JSP Custom Tag \u2013 using BodyTag interface or BodyTagSupport<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"jz_research_post":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,4],"tags":[330],"class_list":["post-1724","post","type-post","status-publish","format-standard","hentry","category-java","category-jsp","tag-jsp"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":1716,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/jsp\/life-cycle-of-jsp-bodytag-interface\/","url_meta":{"origin":1724,"position":0},"title":"Life cycle of JSP BodyTag 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