/java2s
/WEB-INF/java2s.tld
// create Fichier:java2s.tld in the /WEB-INF/
1.0
1.2
Java2s Simple Tags
defineObjects
com.conygre.jspdevhandbook.chapter9.EmptyTagWithAttrsExport
com.conygre.jspdevhandbook.chapter9.EmptyTagExtraInfo
empty
howMany
name
//compile the following code into WEB-INFclassescomjava2s
package com.java2s;
import javax.servlet.jsp.tagext.TagData;
import javax.servlet.jsp.tagext.TagExtraInfo;
import javax.servlet.jsp.tagext.VariableInfo;
public class EmptyTagExtraInfo extends TagExtraInfo
{
public VariableInfo[] getVariableInfo(TagData tagData)
{
String exportedArrayName = (String) tagData.getAttribute("name");
VariableInfo exportedArrayInfo = new VariableInfo(exportedArrayName,
"int []",
true,
VariableInfo.AT_END);
return new VariableInfo[] {exportedArrayInfo};
}
}
package com.java2s;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
/* This tag handler generates the random numbers. The "howMany" attribute
specifies how many number to generate and display. The generated array
of integers is exported with nested visibility, through an array named
byte the "name" attribute.
*/
public class EmptyTagWithAttrsExport extends BodyTagSupport
{
// Code to implement the "howMany" attribute
private int howMany;
public int getHowMany()
{
return howMany;
}
public void setHowMany(int i)
{
howMany = i;
}
// Code to implement the "name" attribute
private String exportedArrayName;
public String getName()
{
return exportedArrayName;
}
public void setName(String s)
{
exportedArrayName = s;
}
public int doStartTag() throws JspException
{
int[] outputArray = new int[howMany];
System.out.println("Generating " + howMany + " numbers");
for ( int i=0; i
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
A custom tag: scripting variable
output: