请问自定义标签如何使用啊，我按着书上的写了，结果启动tomcat就出错，大家来看看啊！！！！

Question

Starting service Tomcat-Standalone
Apache Tomcat/4.0.6
PARSE error at line 5 column 19
org.xml.sax.SAXParseException: Element type "taglib" must be declared.
PARSE error at line 5 column 19
org.xml.sax.SAXParseException: Element type "taglib" must be declared.
Starting service Tomcat-Apache
Apache Tomcat/4.0.6

Answer 1

Starting service Tomcat-Standalone
Apache Tomcat/4.1.30
2004-8-15 13:31:05 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.util.LocalStrings', returnNull=tru
e
2004-8-15 13:31:05 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.action.ActionResources', returnNul
l=true
2004-8-15 13:31:05 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.webapp.admin.ApplicationResources', retur
nNull=true
2004-8-15 13:31:08 org.apache.commons.digester.Digester error
严重: Parse Error at line 5 column 19: Document root element "taglib", must matc
h DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "taglib", must match DOCTYP
E root "null".
        at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Un
known Source)
        at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.rootElementSpecified(Unkno
wn Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown
 Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Sourc
e)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElemen
t(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanR
ootElementHook(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1567)
        at org.apache.catalina.startup.ContextConfig.tldScanStream(ContextConfig
.java:977)
        at org.apache.catalina.startup.ContextConfig.tldScanTld(ContextConfig.ja
va:1006)
        at org.apache.catalina.startup.ContextConfig.tldScan(ContextConfig.java:
870)
        at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:64
7)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfi
g.java:243)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:3
587)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:821)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:80
7)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
loyer.java:307)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:788)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.j
ava:559)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:401
)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:718)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:358)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1196)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:754)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:363
)
        at org.apache.catalina.core.StandardService.start(StandardService.java:4
97)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:219
0)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
        at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
        at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)

Answer 2

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
2004-8-15 13:31:09 org.apache.commons.digester.Digester error
严重: Parse Error at line 5 column 19: Document is invalid: no grammar found.
org.xml.sax.SAXParseException: Document is invalid: no grammar found.
        at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Un
known Source)
        at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown
 Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Sourc
e)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElemen
t(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanR
ootElementHook(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1567)
        at org.apache.catalina.startup.ContextConfig.tldScanStream(ContextConfig
.java:977)
        at org.apache.catalina.startup.ContextConfig.tldScanTld(ContextConfig.ja
va:1006)
        at org.apache.catalina.startup.ContextConfig.tldScan(ContextConfig.java:
870)
        at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:64
7)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfi
g.java:243)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:3
587)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:821)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:80
7)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
loyer.java:307)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:788)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.j
ava:559)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:401
)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:718)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:358)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1196)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:754)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:363
)
        at org.apache.catalina.core.StandardService.start(StandardService.java:4
97)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:219
0)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
        at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
        at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
2004-8-15 13:31:10 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on port 8080
2004-8-15 13:31:10 org.apache.jk.common.ChannelSocket init
信息: JK2: ajp13 listening on /0.0.0.0:8009
2004-8-15 13:31:10 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/80  config=C:\Program Files\Apache Group\Tomcat 4.1
\conf\jk2.properties
这是我新装的4.1.30报的错误

Answer 3

是TLD文件没有定义对吧
<?xml version="1.0" encoding="SHIFT_JIS"?>
<!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>1.1</jspversion>
    <shortname>Tag Library</shortname>    <!-- table -->
    <tag>
        <name>table</name>
        <tagclass>project.tag.Table</tagclass>
        <bodycontent>jsp</bodycontent>
        <info>Table Tag</info>
        <attribute>
            <name>border</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>bordercolor</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
    <!-- header -->
    <tag>
        <name>header</name>
        <tagclass>project.tag.Header</tagclass>
        <bodycontent>jsp</bodycontent>
        <info>Header Tag</info>
        <attribute>
            <name>headercolor</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
</taglib>
以上定义了两个TAG,table(有两个属性border和bordercolor),header(有一个属性headercolor)

Answer 4

我已经定义了啊
function.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">
  <tlib-version>1.0</tlib-version>
  <jsp-version>1.2</jsp-version>
  <short-name>function</short-name>
  <uri>http://cdshop.com/function</uri>
  <display-name>JSTL sql RT</display-name>
  <description>my function</description>  
  <function>
  <name>trans</name>
  <function-class>JWZ.Function</function-class>
  <function-signature>java.lang.String trans(java.lang.String)</function-signature>
  </function> 
 
</taglib>