Java SHA-256加密的两种实现方法详解

<dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>${common-codec.version}</version></dependency>

/**** 利用Apache的工具类实现SHA-256加密* @param str 加密后的报文* @return*/public static String getSHA256Str(String str){ MessageDigest messageDigest; String encdeStr = ""; try {  messageDigest = MessageDigest.getInstance("SHA-256");  byte[] hash = messageDigest.digest(str.getBytes("UTF-8"));  encdeStr = Hex.encodeHexString(hash); } catch (NoSuchAlgorithmException e) {  e.printStackTrace(); } catch (UnsupportedEncodingException e) {  e.printStackTrace(); } return encdeStr;}

/*** 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();}