自定义标签学习与经验教训1

xiang588

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DannyChen1992

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JSP Web Servlet SUN XML

regtld/Protld.java

package regtld;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspWriter;
import properties.RegProperties;

public class Protld extends TagSupport {

private String temp;
public void setTemp(String temp){
  this.temp=temp;
}
public int doEndTag() throws JspException {
  // TODO 自动生成方法存根
  JspWriter out=pageContext.getOut();
  try{

//new RegProperties().getProperties(temp)自定义的一个从register.properties文件中读取数据的类方法
   out.print(new RegProperties().getProperties(temp));
  }catch(Exception e){
   System.err.println(e);
  }
  return super.doEndTag();
}

}

foot.jsp

<%@page pageEncoding="GB2312"%>
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@taglib uri="/reg" prefix="reg" %>
<table width="800" border="1" align="center" bordercolor="#FF9900">
<tr>
    <td height="20" bgcolor="#FF9900"> </td>
</tr>
<tr>
    <td height="100" align="center" valign="middle" bgcolor="#F0F0F0"><p>版权所有：
      <reg:protld temp="copyright" /></p>
    <p>技术支持：<reg:protld temp="designer" /></p></td>
</tr>
</table>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Register</display-name>
<description>design by xiang</description>

<welcome-file-list>
  <welcome-file>/index.jsp</welcome-file>
</welcome-file-list>

<session-config>
  <session-timeout>30</session-timeout>
</session-config>

<taglib>
  <taglib-uri>/reg</taglib-uri>
  <taglib-location>/WEB-INF/tld/reg.tld</taglib-location>
</taglib>
</web-app>

标签库reg.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>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>tld</short-name>
<uri>/reg</uri>
<tag>
  <name>protld</name>
  <tagclass>regtld.Protld</tagclass>
  <bodycontent>empty</bodycontent>
  <info>Display title</info>
  <attribute>
   <name>temp</name>
   <required>true</required>
   <rtexprvalue>false</rtexprvalue>
   <type>String</type>
  </attribute>
</tag>

</taglib>