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/*
 * Copyright (c) 2018, hiwepy (https://github.com/hiwepy).
 *
 * 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 com.dingtalk.spring.boot.utils;


public class RandomUtils {

  private static final String RANDOM_STR = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

  private static final java.util.Random RANDOM = new java.util.Random();

  public static String getRandomStr() {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 16; i++) {
      sb.append(RANDOM_STR.charAt(RANDOM.nextInt(RANDOM_STR.length())));
    }
    return sb.toString();
  }

}