IdentityUtils.java

/**
 * Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 *   Author: Guoqiang Chen
 *    Email: subchen@gmail.com
 *   WebURL: https://github.com/subchen
 *
 * 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 jetbrick.util;

import java.security.SecureRandom;
import java.util.UUID;

/**
 * 封装各种生成唯一性ID算法的工具类.
 */
public class IdentityUtils {
    private static SecureRandom random = new SecureRandom();

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间有-分割.
     */
    public static String uuid36() {
        return UUID.randomUUID().toString();
    }

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
     */
    public static String uuid32() {
        return StringUtils.remove(uuid36(), '-');
    }

    public static String uuid16() {
        return RandomStringUtils.randomAlphanumeric(16);
    }

    /**
     * 使用SecureRandom随机生成Int.
     */
    public static int randomInt() {
        return Math.abs(random.nextInt());
    }

    /**
     * 使用SecureRandom随机生成Long.
     */
    public static long randomLong() {
        return Math.abs(random.nextLong());
    }
}