Android encapsulated http request utility class

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.security.KeyStore;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.content.Context;
import android.net.ConnectivityManager;
/**
 *  Network tools 
 * 
 * @author malinkang
 * 
 */
public class NetUtils {
    /**
     *  Determine the network connection status 
     * 
     * @return true,  Available;  false .   Do not use 
     */
    public static boolean isOpenNetwork(Context context) {
        ConnectivityManager connManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connManager.getActiveNetworkInfo() != null) {
            return connManager.getActiveNetworkInfo().isAvailable();
        }
        return false;
    }
    /**
     * get request 
     * 
     * @param urlString
     * @param params
     * @return
     */
    public static String getRequest(String urlString, Map<String, String> params) {
        try {
            StringBuilder urlBuilder = new StringBuilder();
            urlBuilder.append(urlString);
            if (null != params) {
                urlBuilder.append("?");
                Iterator<Entry<String, String>> iterator = params.entrySet()
                        .iterator();
                while (iterator.hasNext()) {
                    Entry<String, String> param = iterator.next();
                    urlBuilder
                            .append(URLEncoder.encode(param.getKey(), "UTF-8"))
                            .append('=')
                            .append(URLEncoder.encode(param.getValue(), "UTF-8"));
                    if (iterator.hasNext()) {
                        urlBuilder.append('&');
                    }
                }
            }
            //  create HttpClient object 
            HttpClient client = getNewHttpClient();
            //  send get A request to create HttpGet object 
            HttpGet getMethod = new HttpGet(urlBuilder.toString());
            HttpResponse response = client.execute(getMethod);
            //  Get status code 
            int res = response.getStatusLine().getStatusCode();
            if (res == 200) {
                StringBuilder builder = new StringBuilder();
                //  Get response content 
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(response.getEntity().getContent()));
                for (String s = reader.readLine(); s != null; s = reader
                        .readLine()) {
                    builder.append(s);
                }
                return builder.toString();
            }
        } catch (Exception e) {
        }
        return null;
    }
    /**
     * post request 
     * 
     * @param urlString
     * @param params
     * @return
     */
    public static String postRequest(String urlString,
            List<BasicNameValuePair> params) {
        try {
            // 1.  create HttpClient object 
            HttpClient client = getNewHttpClient();
            // 2.  hair get A request to create HttpGet object 
            HttpPost postMethod = new HttpPost(urlString);
            postMethod.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
            HttpResponse response = client.execute(postMethod);
            int statueCode = response.getStatusLine().getStatusCode();
            if (statueCode == 200) {
                System.out.println(statueCode);
                return EntityUtils.toString(response.getEntity());
            }
        } catch (Exception e) {
        }
        return null;
    }
    //  When saving + The number of seconds, 
    public static long expires(String second) {
        Long l = Long.valueOf(second);
        return l * 1000L + System.currentTimeMillis();
    }
    private static HttpClient getNewHttpClient() {
        try {
            KeyStore trustStore = KeyStore.getInstance(KeyStore
                    .getDefaultType());
            trustStore.load(null, null);
            SSLSocketFactory sf = new SSLSocketFactoryEx(trustStore);
            sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            HttpParams params = new BasicHttpParams();
            HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
            HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);
            SchemeRegistry registry = new SchemeRegistry();
            registry.register(new Scheme("http", PlainSocketFactory
                    .getSocketFactory(), 80));
            registry.register(new Scheme("https", sf, 443));
            ClientConnectionManager ccm = new ThreadSafeClientConnManager(
                    params, registry);
            return new DefaultHttpClient(ccm, params);
        } catch (Exception e) {
            return new DefaultHttpClient();
        }
    }
}

Another wrapped get request that has been used frequently recently:

public class HttpUtils {
    private final static String TAG = "EasyTokenSevice";
    private final static int connectionTimeout = 5000;
    private static InputStream inputStream = null;
    private static String urlStr = null;
    private static boolean isConnecting;
    /**
     *  encapsulation http get request 
     * 
     * @param url
     * @return is
     */
    public static InputStream get(String url)throws IOException ,Exception {
        urlStr = url;
        isConnecting = true;
            HttpGet httpGet = new HttpGet(urlStr);
            HttpParams httpParameters = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters,
                    connectionTimeout);
            DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
            HttpResponse response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                HttpEntity entity = response.getEntity();
                inputStream = entity.getContent();
                return inputStream;}
            else return null;

                

        
    }
}