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用自定义标签实现HTML中的特殊元素转义字符

2012-11-20 19:58 344 查看
ViewIPTag.java

public class ViewIPTag extends TagSupport {

public int doStartTag() throws JspException {

String ip = pageContext.getRequest().getRemoteAddr();

try {

pageContext.getOut().write(ip);

} catch (Exception e) {

e.printStackTrace();

}

return super.doStartTag();

}

}

xu.tld

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">

<taglib>

<jsp-version>1.0</jsp-version>

<tlib-version>1.0</tlib-version>

<short-name>wangtongtaglib</short-name>

<uri>/wangtongtaglib</uri>

<tag>

<name>viewip</name>

<tag-class>tag.ViewIPTag</tag-class>

<body-content>empty</body-content>

</tag>

</taglib>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%@taglib uri="http://csdn.hbsi.3g/TagTest" prefix="wangtong" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!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>

This is my JSP page. <br>

<wangtong:viewip />

</body>

</html>
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