stringutils.java

jsp中 urlRewrite的源代码 很有用的喔

/**
 * Copyright (c) 2005, Paul Tuckey
 * All rights reserved.
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
package org.tuckey.web.filters.urlrewrite.utils;

/**
 * In the style of commons-lang StringUtils, but a bit smaller!.
 *
 * @author Paul Tuckey
 * @version $Revision: 1.4 $ $Date: 2005/12/07 10:27:00 $
 */
public class StringUtils {

    public static String trim(final String str) {
        if (str == null) {
            return null;
        }
        return str.trim();
    }

    public static boolean isBlank(final String str) {
        if (str == null) {
            return true;
        }
        if ("".equals(str)) {
            return true;
        }
        return "".equals(str.trim());
    }

    public static String notNull(final String str) {
        if (str == null) {
            return "";
        }
        return str;
    }

    public static String nl2br(String note) {
        if (note == null) return null;
        return note.replaceAll("\n", "<br />");
    }

}