sha256---利用java自带的实现加密

利用java自带的实现加密：参考https://jingyan.baidu.com/article/2fb0ba40a2ef2b00f3ec5f74.html

/***  利用java原生的摘要实现SHA256加密* @param str 加密后的报文* @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<bytes.length;i++){temp = Integer.toHexString(bytes[i] & 0xFF);if (temp.length()==1){//1得到一位的进行补0操作stringBuffer.append("0");}stringBuffer.append(temp);}return stringBuffer.toString();}