关于定制JSTL标签的问题
我第一次定制一个JSTL标签，并写了个JSP页面测试
首先写了一个JSTL标签处理器类：
package com.iven.tag;
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
public class TempChangeTag extends BodyTagSupport
{
protected String to= "Celsius ";
public void setTo(String to)
{
this.to=to;
}
public String getTo()
{
return this.to;
}
public int doAfterBody()
{
try
{
BodyContent bc=this.getBodyContent();
JspWriter out=bc.getEnclosingWriter();
String bd=bc.getString();
String fa=String.valueOf((Integer.parseInt(bd)+112));
String ke=String.valueOf((Integer.parseInt(bd)+273));
if(to.equals( "Fahrenheit ")==true || to.equals( "F ")==true)
{
out.print(fa);
}
else if(to.equals( "Kelvin ")==true || to.equals( "K ")==true)
{
out.print(ke);
}
else
{
out.print(bd);
}
}
catch(Exception e)
{
try
{
this.getBodyContent().getEnclosingWriter().print( "出错了！ "+ " <br/> "+e);
}
catch(Exception e1)
{
e1.printStackTrace();
}
}
return EVAL_PAGE;
}
}
将这个类放到了/WEB-INF/classes/com/iven/tag/目录下；
----------------------------
之后就开始写一个TLD文件：
<?xml version= "1.0 " encoding= "ISO-8859-1 "?>
<!DOCTYPE taglib
PUBLIC "-//sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN "
"http://java.sun.com/j2ee/dtds/web_jsptaglibrary_1_1.dtd ">
<taglib>
<tlibversion> 1.0 </tlibversion>
<jspversion> 2.0 </jspversion>
<shortname> switchtemp </shortname>
<tag>
<name> temp </name>
<tagclass>
com.iven.tag.TempChangeTag
</tagclass>
<bodycontent> JSP </bodycontent>
<attribute>
<name> to </name>
<required> false </required>
</attribute>
</tag>
</taglib>
然后将这个名为TempChe.tld文件放到WEB-INF目录下；
------------------------------------------------------
最后配置web.xml文件：
<taglib>
<taglib-uri> /test/switchtemp </taglib-uri>
<taglib-location> /WEB-INF/TempChe.tld </taglib-location>
</taglib>
我的测试JSP文件是：
<%@ page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.*,com.iven.pub.Str " errorPage= " " %>
<%@ taglib uri= "/test/switchtemp " prefix= "temp_st "%>
下列代码将100摄氏度转换为212华氏度： <br/>
1: <temp_st:temp to= "Fahrenheit "> 100 </temp_st:temp> <br/>
2: <temp_st:temp to= "F "> 100 </temp_st:temp>
<br/> <br/>
下列代码将100摄氏度转换为373开氏度： <br/>
1: <temp_st:temp to= "Kelvin "> 100 </temp_st:temp> <br/>
2: <temp_st:temp to= "K "> 100 </temp_st:temp>
3: <temp_st:temp> 100 </temp_st:temp>
---------------------------------------------------
结果报错：
Unable to initialize TldLocationsCache: XML parsing error on file /WEB-INF/TempChe.tld
谁能告诉我怎么解决啊？哪儿有错？谢谢！
[解决办法]
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN "
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd ">
