import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class Sha256 {    public static String getSHA256(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;    }    private static String byte2Hex(byte[] bytes){        StringBuffer stringBuffer = new StringBuffer();        String temp = null;        for (int i=0;i