/* * 微信公眾平臺(JAVA) SDK * * Copyright (c) 2016, Ansitech Network Technology Co.,Ltd All rights reserved. * http://www.ansitech.com/weixin/sdk/ * * 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.levi.utils; import java.security.MessageDigest; /** * <p>Title: SHA1算法</p> * * @author levi */public final class SHA1 {   private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5',              '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};   /**   * Takes the raw bytes from the digest and formats them correct.   *   * @param bytes the raw bytes from the digest.   * @return the formatted bytes.   */  private static String getFormattedText(byte[] bytes) {    int len = bytes.length;    StringBuilder buf = new StringBuilder(len * 2);    // 把密文轉換成十六進制的字符串形式    for (int j = 0; j < len; j++) {      buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);      buf.append(HEX_DIGITS[bytes[j] & 0x0f]);    }    return buf.toString();  }   public static String encode(String str) {    if (str == null) {      return null;    }    try {      MessageDigest messageDigest = MessageDigest.getInstance("SHA1");      messageDigest.update(str.getBytes());      return getFormattedText(messageDigest.digest());    } catch (Exception e) {      throw new RuntimeException(e);    }  }}