HttpURLConnection 返回漢字亂碼（全是問號）

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public static String doPost(String urlStr, Map<String, Object> paramMap) throws Exception {        URL url = new URL(urlStr);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setRequestMethod(SERVLET_POST);        String paramStr = prepareParam(paramMap);        conn.setRequestProperty("Content-type", "application/x-www-form-urlencoded");        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)");        conn.setRequestProperty("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*");        conn.setRequestProperty("Accept-Language", "zh-cn");        conn.setRequestProperty("UA-CPU", "x86");        conn.setUseCaches(false);        conn.setConnectTimeout(6 * 1000);        conn.setReadTimeout(6 * 1000);        conn.setDoOutput(true);        conn.setDoInput(true);        conn.setRequestProperty("Charset", "utf-8");        OutputStream os = conn.getOutputStream();        os.write(paramStr.toString().getBytes("utf-8"));        os.close();        String result = "";        if (conn.getResponseCode() == conn.HTTP_OK) {            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));            String line;            while ((line = br.readLine()) != null) {                result += line;            }            System.out.println(result);            br.close();            return result;        }        return result;    }

 

HttpURLConnection 返回漢字亂碼（全是問號）