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<String> keys = new ArrayList<>(); private final List<Object> values = new ArrayList<>(); @Override public void doTag() throws JspException, IOException { JspWriter out = getJspContext().getOut(); for( int i = 0; i < keys.size(); i++ ) { String key = keys.get( i ); Object value = values.get( i ); out.println( "<li>" + key + " = " + value + "</li>" ); } } @Override public void setDynamicAttribute( String uri, String localName, Object value ) throws JspException { keys.add( localName ); values.add( value ); } }