import java.io.BufferedReader;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.net.HttpURLConnection;  import java.net.URL;  import java.util.HashMap;  import java.util.Map;  import android.text.TextUtils;  import android.util.Log;    public class WebHttpHelper {        private static WebHttpHelper util;        public static WebHttpHelper getInstance() {            if (util == null) {              util = new WebHttpHelper();          }          return util;        }        private WebHttpHelper() {          super();      }        public InputStream getInputStream(String urlS, Map<String, String> param,              boolean isGet) throws Exception {          URL url = null;          HttpURLConnection hc = null;          StringBuffer request = new StringBuffer();            try {                String get = "GET";              for (String key : param.keySet()) {                    request.append(key + "=" + param.get(key) + "&");              }                String newUrl = urlS;              if (!TextUtils.isEmpty(request.toString())) {                  newUrl = urlS + "?" + request.toString();              }                Log.e("url", newUrl);              if (!isGet) {                  get = "POST";                  url = new URL(urlS);                } else {                    url = new URL(newUrl);                }                hc = (HttpURLConnection) url.openConnection();              hc.setConnectTimeout(45000);              // hc.setRequestProperty("Cookie", ConstUtil.COOKIEMESSAGE);                hc.setRequestMethod(get);              if (!isGet) {                    for (String key : param.keySet()) {                        hc.addRequestProperty(key, param.get(key));                  }                  hc.setDoOutput(true);                  hc.getOutputStream().flush();                  hc.getOutputStream().close();              }                hc.setInstanceFollowRedirects(false);                hc.setDoInput(true);            } catch (Exception e) {              e.printStackTrace();          }            return hc.getInputStream();        }        public String getString(String urlS, Map<String, String> param,              boolean isGet, String encoding) {          if (param == null) {              param = new HashMap<String, String>();          }          BufferedReader br = null;            StringBuffer sb = new StringBuffer();            try {              br = new BufferedReader(new InputStreamReader(getInputStream(urlS,                      param, isGet), encoding));              String temp = "";              while ((temp = br.readLine()) != null) {                  sb.append(temp);              }            } catch (Exception e) {              e.printStackTrace();          }          return sb.toString();      }  }