JSP 自定义标签例子(BodyTagSupport)
2012-07-25 10:31
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1.在WEB-INF下新建一个stag.tld文件
2.
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<?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"> <taglib> <tlibversion>1.0</tlibversion> <jspversion>1.1</jspversion> <shortname>tbl</shortname> <tag> <name>stag</name> <tagclass>test.MyTag</tagclass> <bodycontent>JSP</bodycontent> <info>To Convert in Upper case tag</info> </tag> </taglib>
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package test; import javax.servlet.*; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.util.*; import java.io.*; public class MyTag extends BodyTagSupport { public int doAfterBody() throws JspException { try { BodyContent bodycontent = getBodyContent(); System.out.println("---------bodycontent---------:"+bodycontent); String body = bodycontent.getString(); System.out.println("---------body---------:"+body); JspWriter out = bodycontent.getEnclosingWriter(); System.out.println("---------out---------:"+out); if(body != null) { out.print(body.toUpperCase()); } } catch(IOException ioe) { throw new JspException("Error:"+ioe.getMessage()); } return SKIP_BODY; } @Override public int doEndTag() throws JspException { System.out.println("---------doEndTag()----------"); return super.doEndTag(); } @Override public void doInitBody() throws JspException { System.out.println("---------doInitBody()----------"); super.doInitBody(); } @Override public int doStartTag() throws JspException { System.out.println("---------doStartTag()----------"); return super.doStartTag(); } }
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<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%@ taglib uri="/WEB-INF/stag.tld" prefix="tbl" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <tbl:stag> hello ! BodyTagSupport例子 </tbl:stag> </body> </html>
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