java http 请求之post json数据

package com.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONStringer;

import android.content.Context;
import android.telephony.NeighboringCellInfo;
import android.telephony.TelephonyManager;

public class Location {
public static String LOCATIONS_URL = "http://www.google.com/loc/json";

public static String getLocations(Context context) {
// generate json request
String jr = generateJsonRequest(context);

try {
DefaultHttpClient client = new DefaultHttpClient();

StringEntity entity = new StringEntity(jr);

HttpPost httpost = new HttpPost(LOCATIONS_URL);
httpost.setEntity(entity);

HttpResponse response = client.execute(httpost);

String locationsJSONString = getStringFromHttp(response.getEntity());

return extractLocationsFromJsonString(locationsJSONString);
} catch (ClientProtocolException e) {

//e.printStackTrace();
} catch (IOException e) {

//e.printStackTrace();
} catch (Exception e) {
//e.printStackTrace();
}
return null;

}

private static String extractLocationsFromJsonString(String jsonString) {
String country = "";
String region = "";
String city = "";
String street = "";
String street_number = "";
double latitude = 0.0;
double longitude = 0.0;

//"accuracy":901.0
double accuracy = 0.0;

try {
JSONObject jo = new JSONObject(jsonString);
JSONObject location = (JSONObject) jo.get("location");
latitude = (Double) location.get("latitude");
longitude = (Double) location.get("longitude");
accuracy = (Double) location.get("accuracy");
JSONObject address = (JSONObject) location.get("address");

country = (String) address.get("country");
region = (String) address.get("region");
city = (String) address.get("city");
street = (String) address.get("street");
street_number = (String) address.get("street_number");
} catch (JSONException e) {

//e.printStackTrace();
}

return "(" + latitude + "," + longitude + ")\t" + country + region + city
+ street + street_number + "\t" + "精确度：" + accuracy;
}

// 获取所有的网页信息以String 返回
private static String getStringFromHttp(HttpEntity entity) {

StringBuffer buffer = new StringBuffer();

try {
// 获取输入流
BufferedReader reader = new BufferedReader(new InputStreamReader(
entity.getContent()));

// 将返回的数据读到buffer中
String temp = null;

while ((temp = reader.readLine()) != null) {
buffer.append(temp);
}
} catch (IllegalStateException e) {

//e.printStackTrace();
} catch (IOException e) {
//e.printStackTrace();
}
return buffer.toString();
}

private static String generateJsonRequest(Context context) {
TelephonyManager manager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
List<NeighboringCellInfo> cellList = manager.getNeighboringCellInfo();

if (cellList.size() == 0)
return null;

JSONStringer js = new JSONStringer();
try {

js.object();

js.key("version").value("1.1.0");
js.key("host").value("maps.google.com");
js.key("home_mobile_country_code").value(460);
js.key("home_mobile_network_code").value(0);
js.key("radio_type").value("gsm");
js.key("request_address").value(true);
js.key("address_language").value("zh_CN");

JSONArray ct = new JSONArray();

for (NeighboringCellInfo info : cellList) {

JSONObject c = new JSONObject();
c.put("cell_id", info.getCid());
c.put("location_area_code", info.getLac());
c.put("mobile_country_code", 460);
c.put("mobile_network_code", 0);
c.put("signal_strength", info.getRssi()); // 获取邻居小区信号强度

ct.put(c);
}
js.key("cell_towers").value(ct);
js.endObject();
} catch (JSONException e) {
//e.printStackTrace();
return null;
}

return js.toString().replace("true", "True");
}
}