<?xml version="1.0" encoding="UTF-8" ?>
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<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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<description>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>SimpleTagLibrary</short-name>
<uri>http://tomcat.apache.org/jsp2-example-taglib</uri>
<tag>
<description>Outputs Hello, World</description>
<name>helloWorld</name>
<tag-class>jsp2.examples.simpletag.HelloWorldSimpleTag</tag-class>
<body-content>empty</body-content>
</tag>
<tag>
<description>Repeats the body of the tag 'num' times</description>
<name>repeat</name>
<tag-class>jsp2.examples.simpletag.RepeatSimpleTag</tag-class>
<body-content>scriptless</body-content>
<variable>
<description>Current invocation count (1 to num)</description>
<name-given>count</name-given>
</variable>
<attribute>
<name>num</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
<tag>
<description>Populates the page context with a BookBean</description>
<name>findBook</name>
<tag-class>jsp2.examples.simpletag.FindBookSimpleTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>var</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
<tag>
<description>
Takes 3 fragments and invokes them in a random order
</description>
<name>shuffle</name>
<tag-class>jsp2.examples.simpletag.ShuffleSimpleTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>fragment1</name>
<required>true</required>
<fragment>true</fragment>
</attribute>
<attribute>
<name>fragment2</name>
<required>true</required>
<fragment>true</fragment>
</attribute>
<attribute>
<name>fragment3</name>
<required>true</required>
<fragment>true</fragment>
</attribute>
</tag>
<tag>
<description>Outputs a colored tile</description>
<name>tile</name>
<tag-class>jsp2.examples.simpletag.TileSimpleTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>color</name>
<required>true</required>
</attribute>
<attribute>
<name>label</name>
<required>true</required>
</attribute>
</tag>
<tag>
<description>
Tag that echoes all its attributes and body content
</description>
<name>echoAttributes</name>
<tag-class>jsp2.examples.simpletag.EchoAttributesTag</tag-class>
<body-content>empty</body-content>
<dynamic-attributes>true</dynamic-attributes>
</tag>
<function>
<description>Reverses the characters in the given String</description>
<name>reverse</name>
<function-class>jsp2.examples.el.Functions</function-class>
<function-signature>java.lang.String reverse( java.lang.String )</function-signature>
</function>
<function>
<description>Counts the number of vowels (a,e,i,o,u) in the given String</description>
<name>countVowels</name>
<function-class>jsp2.examples.el.Functions</function-class>
<function-signature>java.lang.String numVowels( java.lang.String )</function-signature>
</function>
<function>
<description>Converts the string to all caps</description>
<name>caps</name>
<function-class>jsp2.examples.el.Functions</function-class>
<function-signature>java.lang.String caps( java.lang.String )</function-signature>
</function>
</taglib>
WEB-INF/classes/jsp2/examples/simpletag/HelloWorldSimpleTag.java
package jsp2.examples.simpletag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
/**
* SimpleTag handler that prints "Hello, world!"
*/
public class HelloWorldSimpleTag extends SimpleTagSupport {
@Override
public void doTag() throws JspException, IOException {
getJspContext().getOut().write( "Hello, world!" );
}
}
<%@ taglib prefix="my" uri="http://tomcat.apache.org/jsp2-example-taglib"%>
jsp2.examples.el.Functions
public class Functions {
public static String reverse( String text ) {
return new StringBuilder( text ).reverse().toString();
}
public static int numVowels( String text ) {
String vowels = "aeiouAEIOU";
int result = 0;
for( int i = 0; i < text.length(); i++ ) {
if( vowels.indexOf( text.charAt( i ) ) != -1 ) {
result++;
}
}
return result;
}
public static String caps( String text ) {
return text.toUpperCase(Locale.ENGLISH);
}
}