DefaultHttpClient访问url

public static String doHttpConnection(String urlStr, String postStr) {
        String result = null;
        HttpClient httpclient = new DefaultHttpClient();
        try {
            HttpPost httpPost = new HttpPost(urlStr);
            httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 120000);// 2分钟
            httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 420000);// 7分钟
            List<BasicNameValuePair> nvps = new ArrayList<BasicNameValuePair>();
            nvps.add(new BasicNameValuePair("info", postStr));
            httpPost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
            HttpResponse response = httpclient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                String backResult = EntityUtils.toString(entity, HTTP.UTF_8);
                JSONObject jsonObject = JSONObject.parseObject(backResult);
                Object message = jsonObject.get("message");
                if (message != null) {
                    result = message.toString();
                }
            } else {
                result = "返回实体为空!";
            }
        } catch (SocketTimeoutException e) {
            // TODO: handle exception
            e.printStackTrace();
            result = "读取超时!";
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            result = "接口调用异常!";
        } finally {
            httpclient.getConnectionManager().shutdown();
        }