通过json获取后台服务器数据

import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.params.BasicHttpParams;import org.apache.http.params.HttpConnectionParams;import org.apache.http.protocol.HTTP;import org.json.JSONException;import org.json.JSONObject;import android.util.Log;public class NetworkConnect {      //服务器URLprivate String base_url = "http://10.1.1.1:8080/Service/";private static final String TAG = "API";        //返回得到object对象public JSONObject getJSONObject(String function,List<NameValuePair> nameValuePairs) {JSONObject json = null;String resultStr = getRequest(base_url + function, nameValuePairs);if (resultStr == "" || resultStr == null) {return null;}try {json = new JSONObject(resultStr);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}return json;}protected String getRequest(String url, List<NameValuePair> nameValuePairs) {String result = "";int statusCode = 0;BasicHttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, 3000); HttpConnectionParams.setSoTimeout(httpParams, 3000);HttpClient client = new DefaultHttpClient(httpParams);HttpPost getMethod = new HttpPost(url);try {getMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs));} catch (UnsupportedEncodingException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}Log.d(TAG, "do the getRequest,url=" + url + "");try {HttpResponse httpResponse = client.execute(getMethod);// statusCode == 200 正常statusCode = httpResponse.getStatusLine().getStatusCode();Log.d(TAG, "statuscode = " + statusCode);// 处理返回的httpResponse信息result = retrieveInputStream(httpResponse.getEntity());} catch (Exception e) {Log.e(TAG, e.getMessage());} finally {getMethod.abort();}return result;}protected String retrieveInputStream(HttpEntity httpEntity) {int length = (int) httpEntity.getContentLength();if (length < 0)length = 10000;StringBuffer stringBuffer = new StringBuffer(length);try {InputStreamReader inputStreamReader = new InputStreamReader(httpEntity.getContent(), HTTP.UTF_8);char buffer[] = new char[length];int count;while ((count = inputStreamReader.read(buffer, 0, length - 1)) > 0) {stringBuffer.append(buffer, 0, count);}} catch (Exception e) {}return stringBuffer.toString();}}