corner.orm.tapestry.service.captcha.RandomUtil.java Source code

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Here is the source code for corner.orm.tapestry.service.captcha.RandomUtil.java

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// Copyright 2007 the original author or authors.
// site: http://www.bjmaxinfo.com
// file: $Id: RandomUtil.java 3678 2007-11-14 04:43:52Z jcai $
// created at:2006-12-10
//
// Licensed 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 corner.orm.tapestry.service.captcha;

import org.apache.commons.codec.digest.DigestUtils;
import org.hibernate.id.UUIDHexGenerator;

/**
 * ???.
 * @author jcai
 * @version $Revision: 3678 $
 * @since 2.3
 */
public class RandomUtil {

    private static UUIDHexGenerator GENERATOR = new UUIDHexGenerator();

    /**
     * ???
     * @param string 
     * @return ?
     */
    public static String encodeStr(String string) {
        String str = DigestUtils.md5Hex(string);
        StringBuffer sb = new StringBuffer();
        sb.append(str.charAt(7));
        sb.append(str.charAt(15));
        sb.append(str.charAt(23));
        sb.append(str.charAt(31));
        return sb.toString();
    }

    /**
     * ?UUID.
     * @return ?UUID.
     */
    public static String generateUUIDString() {
        return GENERATOR.generate(null, null).toString();
    }
}