java通过短信发送验证码

/*
     * 如uid是：test，登录密码是：123123
       pwd=md5(123123test),即
       pwd=b9887c5ebb23ebb294acab183ecf0769
       线生成地址：http://www.sms.cn/password
     */
    private static final String addr = "http://api.sms.cn/mt/";
    private static final String userId = "xxxxxx";
    private static final String pwd = "b9887c5ebb23ebb294acab183ecf0769";
    private static final String encode = "utf8";
    public static String send(String code, String mobile) throws Exception {

        String msgContent = "XXXXXXXXXXXXXXXXXXXXXX欢迎您的加入，验证码为:" + code;
        //组建请求
        String straddr = addr +
                "?uid=" + userId +
                "&pwd=" + pwd +
                "&mobile=" + mobile +
                "&encode=" + encode +
                "&content=" + msgContent;

        StringBuffer sb = new StringBuffer(straddr);
        System.out.println("URL:" + sb);

        //发送请求
        URL url = new URL(sb.toString());
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        BufferedReader in = new BufferedReader(new InputStreamReader( url.openStream(), "gbk"));

        //返回结果
        String inputline = in.readLine();
        return inputline;
    }