Jsp中解释动态属性的问题
我正在尝试在 Jsp 中处理动态属性，但没有显示任何响应。
这是 JSP 代码：
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="mine" uri="DiceFunctions" %>
<html><body>
<mine:advice suggest="yo haa haa" >
</mine:advice>
</body></html>
TLD 文件，位于 WEB-INF 文件夹中：
<?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>1.2</tlib-version>
<jsp-version>2.0</jsp-version>
<uri>DiceFunctions</uri>
<tag>
<name>advice</name>
<tag-class>foo.AdvisorTagHandler</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>optionList</name>
<type>java.util.List</type>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>name</name>
<required>false</required>
</attribute>
<attribute>
<name>size</name>
<required>false</required>
</attribute>
<dynamic-attributes>true</dynamic-attributes>
</tag>
和标签处理程序类：
package foo;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.*;
import java.io.*;
import javax.servlet.jsp.*;
import java.util.*;
public class AdvisorTagHandler extends TagSupport implements DynamicAttributes {
private Map<String,Object> tagAttrs=new HashMap<String,Object>();
public int doStartTag() throws JspException{
//movieCounter=0;
try{
for(String attr: tagAttrs.keySet())
{
String attrd=String.format("%s='%s'",tagAttrs.get(attr));
pageContext.getOut().print(attrd);
}
}
catch(Exception e)
{
}
return SKIP_BODY;
}
public void setDynamicAttribute(String uri, String name, Object value){
tagAttrs.put(name,value);
}
public int doEndTag() throws JspException{
return EVAL_PAGE;
}
我需要做什么修改才能显示动态属性值？
提前致谢。
I'm trying to process dynamic attributes in Jsp, but I'm getting display nothing in response.
Here's the JSP code:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="mine" uri="DiceFunctions" %>
<html><body>
<mine:advice suggest="yo haa haa" >
</mine:advice>
</body></html>
The TLD file, which is in WEB-INF folder:
<?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>1.2</tlib-version>
<jsp-version>2.0</jsp-version>
<uri>DiceFunctions</uri>
<tag>
<name>advice</name>
<tag-class>foo.AdvisorTagHandler</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>optionList</name>
<type>java.util.List</type>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>name</name>
<required>false</required>
</attribute>
<attribute>
<name>size</name>
<required>false</required>
</attribute>
<dynamic-attributes>true</dynamic-attributes>
</tag>
and the tag handler class:
package foo;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.*;
import java.io.*;
import javax.servlet.jsp.*;
import java.util.*;
public class AdvisorTagHandler extends TagSupport implements DynamicAttributes {
private Map<String,Object> tagAttrs=new HashMap<String,Object>();
public int doStartTag() throws JspException{
//movieCounter=0;
try{
for(String attr: tagAttrs.keySet())
{
String attrd=String.format("%s='%s'",tagAttrs.get(attr));
pageContext.getOut().print(attrd);
}
}
catch(Exception e)
{
}
return SKIP_BODY;
}
public void setDynamicAttribute(String uri, String name, Object value){
tagAttrs.put(name,value);
}
public int doEndTag() throws JspException{
return EVAL_PAGE;
}
what's modification do I've to do to display dynamic attributes value?
Thanks in advance.
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评论（2）
这一行有一个问题：
您指定了两个字符串参数，但只提供了一个。
像这样的东西应该效果更好：
There is a problem in this line:
You specify two string arguments, but only provide one.
Something like this should work better:
您可以将一些代码放入空的 catch 块中，看看会发生什么......
You could put some code in the empty catch blocks and see what happens...