Android 使用URLConnection来post数据

    /**
     * @param postUrl
     *            需要post的地址
     * @param map
     *            存储数据的map
     * @param handler
     *            处理message的handler
     */
    public static  void postDatas(String postUrl, Map<String, String> map,
            Handler handler) {
        HttpURLConnection connection = null;
        URL url;

        int result_code;
        // 拼串
        StringBuffer sb = new StringBuffer();
        if (map != null) {
            for (Entry<String, String> e : map.entrySet()) {
                sb.append(e.getKey());
                sb.append("=");
                sb.append(e.getValue());
                sb.append("&");
            }
            sb.substring(0, sb.length() - 1);
        }

        try {
            url = new URL(postUrl);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setConnectTimeout(3000);

            connection.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");

            OutputStreamWriter osw = new OutputStreamWriter(
                    connection.getOutputStream(), "UTF-8");
            osw.write(sb.toString());
            osw.flush();
            osw.close();

            StringBuffer buffer = new StringBuffer();

            BufferedReader br = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(), "UTF-8"));
            String temp;
            while ((temp = br.readLine()) != null) {
                buffer.append(temp);
                // br.readLine();
                buffer.append("\n");
            }

            JSONObject jsonObject = new JSONObject(buffer.toString());

            JSONObject dataObject = jsonObject.getJSONObject("data");

            result_code = dataObject.getInt("result");

            Message message = Message.obtain();

            message.obj = result_code;

            handler.sendMessage(message);

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }

    }

以上方法需要handler作为处理消息结果；

再写一个fragment里的handler：

private static class MyHandler extends Handler {

        private final WeakReference<FragmentActivity> refer;
        private final WeakReference<AccountSetting> fragRefer;

        public MyHandler(FragmentActivity act, AccountSetting frag) {
            refer = new WeakReference<FragmentActivity>(act);
            fragRefer = new WeakReference<AccountSetting>(frag);
        }

        @Override
        public void handleMessage(Message msg) {
            FragmentActivity act = refer.get();
            AccountSetting frag = fragRefer.get();

            switch (msg.what) {
            case MSG_PIC:

                if (act != null && frag != null && frag.isResumed()) {

                    int result_code = (Integer) msg.obj;

                    if (result_code == 0) {
                        ToastUtils.toastWithMessage(act, "上传成功！");
                    } else {
                        ToastUtils.toastWithMessage(act, "上传失败！");
                    }
                }
                break;
    default:
                break;
            }

        }

    }