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File: EchoAttributesTag.java.html
<!DOCTYPE html><html><head><meta charset="UTF-8" /><title>Source Code</title></head><body><pre>/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jsp2.examples.simpletag;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.DynamicAttributes;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
 * SimpleTag handler that echoes all its attributes
 */
public class EchoAttributesTag
    extends SimpleTagSupport
    implements DynamicAttributes
{
    private final List&lt;String> keys = new ArrayList&lt;>();
    private final List&lt;Object> values = new ArrayList&lt;>();

    @Override
    public void doTag() throws JspException, IOException {
        JspWriter out = getJspContext().getOut();
        for( int i = 0; i &lt; keys.size(); i++ ) {
            String key = keys.get( i );
            Object value = values.get( i );
            out.println( "&lt;li>" + key + " = " + value + "&lt;/li>" );
        }
    }

    @Override
    public void setDynamicAttribute( String uri, String localName,
        Object value )
        throws JspException
    {
        keys.add( localName );
        values.add( value );
    }
}
</pre></body></html>