SHA-1加密

　　/**
     * SHA-1加密
     * @param strSrc 要加密的字符串
     * @return 加密后的字符串
     */
    public static String SHAEncrypt(String strSrc) {
        MessageDigest md = null;
        String strDes = null;
        byte[] bt = strSrc.getBytes();
        try {
            md = MessageDigest.getInstance("SHA-1");
            md.update(bt);
            strDes = bytes2Hex(md.digest());
        } catch (NoSuchAlgorithmException e) {
            System.out.println("Invalid algorithm.");
            return null;
        }
        return strDes;
    }

    public static String bytes2Hex(byte[] bts) {
        String des = "";
        String tmp = null;
        for (int i = 0; i < bts.length; i++) {
            tmp = (Integer.toHexString(bts[i] & 0xFF));
            if (tmp.length() == 1) {
                des += "0";
            }
            des += tmp;
        }
        return des;
    }
    //演示
    @Test
    public void demo(){
        System.out.println(SHAEncrypt("1223344"));
    }

输出结果: a3547da48ed532585429eae800ac93147552d63a