By Sayed, January 13th, 2008 [use large font in IE\/Firefox]<\/p>\n
How to create custom tags in JSP?\r\nYou can create custom tags in JSP. \r\nSteps:\r\n-----\r\n1. You have to create a Java file that will define the operation of the custom tag\r\n2. For the Java file, you have to extend javax.servlet.jsp.tagext.BodyTagSupport class\r\n3. in your implementation, you have to override (re-write) doStartTag(), doEndTag(), \r\nand doAfterBody() methods\r\n4. Create tag library description file(XML file with .tld extension).\r\n\r\nExample\r\n-------\r\n\r\nImplement a tag that reverses a string\r\n\r\n\r\nimport java.io.IOException;\r\nimport javax.servlet.jsp.JspTagException;\r\nimport javax.servlet.jsp.JspWriter;\r\nimport javax.servlet.jsp.tagext.BodyContent;\r\nimport javax.servlet.jsp.tagext.BodyTagSupport;\r\n\r\npublic class ReverseTag extends BodyTagSupport \r\n{\r\n private static final long serialVersionUID = 1L; \r\n \r\n \/\/override doStartTag\r\n public int doStartTag() throws JspTagException{\r\n return EVAL_BODY_TAG;\r\n } \r\n \r\n \/\/override doEndTag\r\n public int doEndTag() throws JspTagException \r\n {\r\n try {\r\n JspWriter out = pageContext.getOut();\r\n } catch (Exception ex) {\r\n throw new JspTagException(\"Exception\" + ex);\r\n }\r\n return SKIP_BODY;\r\n }\r\n\r\n\/\/reverse the text \r\npublic int doAfterBody() throws JspTagException \r\n{\r\n BodyContent body = getBodyContent();\r\n try {\r\n JspWriter out = body.getEnclosingWriter();\r\n \/\/get text inside the tag\r\n String bodyContent = body.getString();\r\n \/\/reverse the text\r\n if (bodyContent != null) {\r\n for (int i = bodyContent.length() - 1; i >= 0; i--) {\r\n out.print(bodyContent.charAt(i));\r\n }\r\n }\r\n out.println();\r\n body.clearBody(); \/\/ Clear for next evaluation\r\n } catch (IOException ioe) {\r\n throw new JspTagException(\"Exception at doAfterBody \" + ioe);\r\n }\r\n return (SKIP_BODY);\r\n }\r\n}\r\n\r\n5. Create the taglib descriptor\r\n\r\n<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\r\n<!DOCTYPE taglib PUBLIC \"-\/\/Sun Microsystems, Inc.\r\n\/\/DTD JSP Tag Library 1.1\/\/EN\" \"http:\/\/java.sun.com\/j2ee\/dtds\/web-jsptaglibrary_1_1.dtd\">\r\n<taglib>\r\n <tlibversion>1.0<\/tlibversion>\r\n <jspversion>1.1<\/jspversion>\r\n <shortname><\/shortname>\r\n <info><\/info>\r\n <tag>\r\n <name>stringreverse<\/name>\r\n <tagclass>net.justetc.taglibrary.ReverseTag<\/tagclass>\r\n <info>\r\n Reverse the text\r\n <\/info>\r\n <\/tag>\r\n<\/taglib>\r\n\r\n\r\n6. Example use of the custom tag\r\n\r\n\r\n<%@ taglib uri=\"\/WEB-INF\/reverse.tld\" prefix=\"reverse\" %>\r\n\r\n<html>\r\n<head>\r\n <title>Custom Tag library<\/title>\r\n<\/head>\r\n\r\n<body bgcolor=\"#ffffff\">\r\n\r\n<hr \/>\r\n<reverse:stringreverse>\r\n justetc\r\n<\/reverse:stringreverse>\r\n<hr \/>\r\n<\/body>\r\n<\/html>\r\n\r\n\r\n<\/pre>\n From: http:\/\/sitestree.com\/?p=3645
Categories:Root, By Sayed Ahmed
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Post Data:2016-09-15 14:21:09<\/p>\n
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