在Jsp中解释动态属性时出现问题 [英] Problem in interpreting dynamic attributes in Jsp
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问题描述
我正在尝试在Jsp中处理动态属性，但没有得到任何响应.
I'm trying to process dynamic attributes in Jsp, but I'm getting display nothing in response.
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:
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>
和标记处理程序类:
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;
}
显示动态属性值需要做哪些修改?
what's modification do I've to do to display dynamic attributes value?
谢谢.
推荐答案
此行有问题:
String attrd = String.format("%s='%s'", tagAttrs.get(attr));
您指定两个字符串参数，但仅提供一个.
You specify two string arguments, but only provide one.
类似这样的方法应该可以更好地工作:
Something like this should work better:
try {
for (Map.Entry<String, Object> attr : tagAttrs.entrySet()) {
String attrd = String.format("%s='%s'", attr.getKey(), attr
.getValue().toString());
pageContext.getOut().print(attrd);
}
} catch (IOException e) {
throw new JspException(e);
}
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