ASCII排序,sha256算法，base64编码

/***  * 方法用途: 对所有传入参数按照字段名的 ASCII 码从小到大排序（字典序），并且生成url参数串
* 实现步骤: 
*  * @param paraMap   要排序的Map对象* @param urlEncode   是否需要URLENCODE* @param keyToLower    是否需要将Key转换为全小写*            true:key转化成小写，false:不转化* @return*/  public static String formatUrlMap(Map paraMap, boolean urlEncode, boolean keyToLower)  {  String buff = "";  Map tmpMap = paraMap;  try  {  List> infoIds = new ArrayList>(tmpMap.entrySet());  // 对所有传入参数按照字段名的 ASCII 码从小到大排序（字典序）  Collections.sort(infoIds, new Comparator>()  {  @Override  public int compare(Map.Entry o1, Map.Entry o2)  {  return (o1.getKey()).toString().compareTo(o2.getKey());  }  });  // 构造URL 键值对的格式  StringBuilder buf = new StringBuilder();  for (Map.Entry item : infoIds)  {  if (StringUtils.isNotBlank(item.getKey()))  {  String key = item.getKey();  String val = (String) item.getValue();  if (urlEncode)  {  val = URLEncoder.encode(val, "utf-8");  }  if (keyToLower)  {  buf.append(key.toLowerCase() + "=" + val);  } else  {  buf.append(key + "=" + val);  }  buf.append("&");  }  }  buff = buf.toString();  if (buff.isEmpty() == false)  {  buff = buff.substring(0, buff.length() - 1);  }  } catch (Exception e)  {  return null;  }  return buff;  }

/****方法用途: 对所有传入参数按照字段名的 ASCII 码从小到大排序（字典序），并且生成url参数串 末尾*/public static String unionpayASCII(Map map){Object[] keys =  map.keySet().toArray();Arrays.sort(keys);StringBuilder originStr = new StringBuilder();for(Object key:keys){if(null!=map.get(key)&&!map.get(key).toString().equals("")&&!"signature".equals(key))originStr.append(key).append("=").append(map.get(key)).append("&");}return originStr.toString();}

 * sha256算法 转成16进制字符串* @param str* @return*/public static String getSHA256StrJava(String str){MessageDigest messageDigest;String encodeStr = "";try {messageDigest = MessageDigest.getInstance("SHA-256");messageDigest.update(str.getBytes("UTF-8"));encodeStr = byte2Hex(messageDigest.digest());} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();}return encodeStr;}

 /*** 将byte转为16进制* @param bytes* @return*/private static String byte2Hex(byte[] bytes){StringBuffer stringBuffer = new StringBuffer();String temp = null;for (int i=0;i

 /*** 进行base64编码* @param inputData* @return*/public static String encodeData(String inputData) {try {if (null == inputData) {return null;}return new String(Base64.encodeBase64(inputData.getBytes("utf-8")), "utf-8");} catch (UnsupportedEncodingException e) {}return null;}

 /*** 将字符串sha256算法 byte[]* @param str* @return*/public static byte[] getSHA256byte(String str){MessageDigest messageDigest;String encodeStr = "";byte[] strbyte =null;//byte[] str =null;try {messageDigest = MessageDigest.getInstance("SHA-256");messageDigest.update(str.getBytes("UTF-8"));strbyte = messageDigest.digest();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();}return strbyte;}

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