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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");
    }
}

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