ASCII排序,sha256算法，base64編碼

/**
     *  
     * 方法用途: 對所有傳入參數按照字段名的 ASCII 碼從小到大排序（字典序），並且生成url參數串<br>
     * 實現步驟: <br>
     *  
     * @param paraMap   要排序的Map對象
     * @param urlEncode   是否需要URLENCODE
     * @param keyToLower    是否需要將Key轉換爲全小寫
     *            true:key轉化成小寫，false:不轉化
     * @return
     */  
    public static String formatUrlMap(Map<String, Object> paraMap, boolean urlEncode, boolean keyToLower)  
    {  
        String buff = "";  
        Map<String, Object> tmpMap = paraMap;  
        try  
        {  
            List<Map.Entry<String, Object>> infoIds = new ArrayList<Map.Entry<String, Object>>(tmpMap.entrySet());  
            // 對所有傳入參數按照字段名的 ASCII 碼從小到大排序（字典序）  
            Collections.sort(infoIds, new Comparator<Map.Entry<String, Object>>()  
            {  
   
                @Override  
                public int compare(Map.Entry<String, Object> o1, Map.Entry<String, Object> o2)  
                {  
                    return (o1.getKey()).toString().compareTo(o2.getKey());  
                }  
            });  
            // 構造URL 鍵值對的格式  
            StringBuilder buf = new StringBuilder();  
            for (Map.Entry<String, Object> 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: 對所有傳入參數按照字段名的 ASCII 碼從小到大排序（字典序），並且生成url參數串 末尾
	*/
	public static String unionpayASCII(Map<String, Object> 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 轉成16進制字符串
	  * @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;
	    }

 /**
	     * 將byte轉爲16進制
	     * @param bytes
	     * @return
	     */
	    private static String byte2Hex(byte[] bytes){
	        StringBuffer stringBuffer = new StringBuffer();
	        String temp = null;
	        for (int i=0;i<bytes.length;i++){
	            temp = Integer.toHexString(bytes[i] & 0xFF);
	            if (temp.length()==1){
	                //1得到一位的進行補0操作
	                stringBuffer.append("0");
	            }
	            stringBuffer.append(temp);
	        }
	        return stringBuffer.toString();
	    }

 /**
	     * 進行base64編碼
	     * @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;
	    }

 /**
	  * 將字符串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;
	    }