SHA256.java

public class SHA256 {

    private static byte[] getHash(String password) {
        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("SHA-256");
            digest.reset();
            return digest.digest(password.getBytes());
        } catch (NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        }
        return new byte[]{};
    }

    public static void main(String[] args) {
        String str = "sdfsdfdsf";
        System.out.println("加密前的数据：" + str);
        byte[] data = getHash(str);
        String s = String.format("%0" + (data.length * 2) + "X",
               new BigInteger(1, data)).toLowerCase();
        System.out.println("加密后的数据：" + s);
    }

}