tld标签库的使用

来源：互联网发布：安工大网络接入系统编辑：程序博客网时间：2024/06/04 22:29

记录-笔记-tld-自定义扩展标签（tld）

www.diybl.com 时间： 2010-07-19 作者：网络编辑：huyang629 点击： 28 [ 评论 ]

一、Java代码

（1）HelloTag.java

package com.tagDemo;

import java.io.IOException;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspTagException;

import javax.servlet.jsp.PageContext;

import javax.servlet.jsp.tagext.Tag;

public class HelloTag implements Tag {

private PageContext pageContext;

private Tag parent;

public HelloTag(){

super();

}

public int doStartTag() throws JspException {

return SKIP_BODY;

}

public int doEndTag() throws JspException {

try{

// for(int i=0;i<1000000000;i++){

// }

pageContext.getOut().write("Hello World!你好，世界！+jboss");

}catch(IOException e){

throw new JspTagException("IO Error: " + e.getMessage());

}

return EVAL_PAGE;

}

public Tag getParent() {

return parent;

}

public void release() {

//释放标签占用资源，比如链接数据库等

}

public void setPageContext(final PageContext pageContext) {

this.pageContext=pageContext;

}

public void setParent(final Tag parent) {

this.parent=parent;

}

-------------------------------------------------------------------------

（2）MyEL.java

package com.tagDemo;

public class MyEL {

/**

* @param name - 用户姓名

* @return

public static String test(String name){

if(name==null || name.equals("")){

name="Visitor";

}

return name;

}

-------------------------------------------------------------------------

（3）MyTag.java

package com.tagDemo;

import java.io.IOException;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.SimpleTagSupport;

public class MyTag extends SimpleTagSupport {

@Override

public void doTag() throws JspException, IOException {

String content = "<table border=1>" +

"<tr bgcolor=9944cc><td>simpeltag测试</tr></td>" +

"<tr tr=cc44cc><td>helloWorld!</td></tr>" +

"</table>";

getJspContext().getOut().write(content);

}

----------------------------------------------------------------------------

二、mytag.tld

<?xml version="1.0" encoding="ISO-8859-1" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd"

version="2.0">

<description>A tag library exercising SimpleTag handlers.</description>

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

<short-name>examples</short-name>

<uri>/tagDemo</uri>

Just a demo for taglib.

</description>

<tag>

<name>helloTag</name>

<tag-class>com.tagDemo.HelloTag</tag-class>

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

first tag demo.

</description>

</tag>

<tag>

<name>helloWorld</name>

<tag-class>com.tagDemo.MyTag</tag-class>

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

</tag>

<function-class>com.tagDemo.MyEL</function-class>

<function-signature>java.lang.String test(java.lang.String)</function-signature>

</function>

</taglib>

---------------------------------------------------------------------------------

三、web.xml

<jsp-config>

<taglib-uri>/tagDemo</taglib-uri>

<taglib-location>/WEB-INF/tlds/mytag.tld</taglib-location>

</taglib>

</jsp-config>

---------------------------------------------------------------------------------

四、mytag.jsp

<%@ page language="java" contentType="text/html;charset=utf-8"%>

<%@ taglib uri="/tagDemo" prefix="hello"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>HelloTag</title>

</head>

<body>

以下的内容从Taglib中显示：

<hello:helloWorld/>

<hr />

以下的内容从EL中显示

${hello:test("")}

以下的内容从Taglib中显示：

<hello:helloTag />

</body>

</html>

文章出处：飞诺网(www.diybl.com):http://www.diybl.com/course/3_program/java/javaxl/20100719/452794.html

0 0