Android Service获取当前位置(GPS+基站)

最新推荐文章于 2023-08-31 15:15:00 发布

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最新推荐文章于 2023-08-31 15:15:00 发布

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本文转自:http://www.apkbus.com/forum.php?mod=viewthread&tid=130732

需求详情：

1)、Service中每隔1秒执行一次定位操作(GPS+基站)
2)、定位的结果实时显示在界面上(要求得到经度、纬度)
技术支持：
1)、获取经纬度
通过GPS+基站获取经纬度，先通过GPS来获取，如果为空改用基站进行获取–>GPS+基站(基站获取支持联通、电信、移动)。
2)、实时获取经纬度
为了达到实时获取经纬度，需在后台启动获取经纬度的Service，然后把经纬度数据通过广播发送出去，在需要的地方进行广播注册(比如在Activity中注册广播，显示在界面中)–>涉及到Service+BroadcastReceiver+Activity+Thread等知识点。
备注：本文注重实践，如有看不懂的，先去巩固下知识点，可以去看看我前面写的几篇文章。
1、CellInfo实体类–>基站信息

package com.ljq.activity;
/**
* 基站信息
*
* @author jiqinlin
*
*/
public class CellInfo {
/** 基站id，用来找到基站的位置 */
private int cellId;
/** 移动国家码，共3位，中国为460，即imsi前3位 */
private String mobileCountryCode="460";
/** 移动网络码，共2位，在中国，移动的代码为00和02，联通的代码为01，电信的代码为03，即imsi第4~5位 */
private String mobileNetworkCode="0";
/** 地区区域码 */
private int locationAreaCode;
/** 信号类型[选 gsm|cdma|wcdma] */
private String radioType="";
public CellInfo() {
}
public int getCellId() {
return cellId;
}
public void setCellId(int cellId) {
this.cellId = cellId;
}
public String getMobileCountryCode() {
return mobileCountryCode;
}
public void setMobileCountryCode(String mobileCountryCode) {
this.mobileCountryCode = mobileCountryCode;
}
public String getMobileNetworkCode() {
return mobileNetworkCode;
}
public void setMobileNetworkCode(String mobileNetworkCode) {
this.mobileNetworkCode = mobileNetworkCode;
}
public int getLocationAreaCode() {
return locationAreaCode;
}
public void setLocationAreaCode(int locationAreaCode) {
this.locationAreaCode = locationAreaCode;
}
public String getRadioType() {
return radioType;
}
public void setRadioType(String radioType) {
this.radioType = radioType;
}
}

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2、Gps类–>Gps封装类，用来获取经纬度

package com.ljq.activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class Gps{
private Location location = null;
private LocationManager locationManager = null;
private Context context = null;
/**
* 初始化
*
* @param ctx
*/
public Gps(Context ctx) {
context=ctx;
locationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
location = locationManager.getLastKnownLocation(getProvider());
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, locationListener);
}
// 获取Location Provider
private String getProvider() {
// 构建位置查询条件
Criteria criteria = new Criteria();
// 查询精度：高
criteria.setAccuracy(Criteria.ACCURACY_FINE);
// 是否查询海拨：否
criteria.setAltitudeRequired(false);
// 是否查询方位角 : 否
criteria.setBearingRequired(false);
// 是否允许付费：是
criteria.setCostAllowed(true);
// 电量要求：低
criteria.setPowerRequirement(Criteria.POWER_LOW);
// 返回最合适的符合条件的provider，第2个参数为true说明 , 如果只有一个provider是有效的,则返回当前provider
return locationManager.getBestProvider(criteria, true);
}
private LocationListener locationListener = new LocationListener() {
// 位置发生改变后调用
public void onLocationChanged(Location l) {
if(l!=null){
location=l;
}
}
// provider 被用户关闭后调用
public void onProviderDisabled(String provider) {
location=null;
}
// provider 被用户开启后调用
public void onProviderEnabled(String provider) {
Location l = locationManager.getLastKnownLocation(provider);
if(l!=null){
location=l;
}
}
// provider 状态变化时调用
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
public Location getLocation(){
return location;
}
public void closeLocation(){
if(locationManager!=null){
if(locationListener!=null){
locationManager.removeUpdates(locationListener);
locationListener=null;
}
locationManager=null;
}
}
}

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3、GpsService服务类

package com.ljq.activity;
import java.util.ArrayList;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.os.IBinder;
import android.util.Log;
public class GpsService extends Service {
ArrayList<CellInfo> cellIds = null;
private Gps gps=null;
private boolean threadDisable=false;
private final static String TAG=GpsService.class.getSimpleName();
@Override
public void onCreate() {
super.onCreate();
gps=new Gps(GpsService.this);
cellIds=UtilTool.init(GpsService.this);
new Thread(new Runnable(){
@Override
public void run() {
while (!threadDisable) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
if(gps!=null){ //当结束服务时gps为空
//获取经纬度
Location location=gps.getLocation();
//如果gps无法获取经纬度，改用基站定位获取
if(location==null){
Log.v(TAG, "gps location null");
//2.根据基站信息获取经纬度
try {
location = UtilTool.callGear(GpsService.this, cellIds);
} catch (Exception e) {
location=null;
e.printStackTrace();
}
if(location==null){
Log.v(TAG, "cell location null");
}
}
//发送广播
Intent intent=new Intent();
intent.putExtra("lat", location==null?"":location.getLatitude()+"");
intent.putExtra("lon", location==null?"":location.getLongitude()+"");
intent.setAction("com.ljq.activity.GpsService");
sendBroadcast(intent);
}
}
}
}).start();
}
@Override
public void onDestroy() {
threadDisable=true;
if(cellIds!=null&&cellIds.size()>0){
cellIds=null;
}
if(gps!=null){
gps.closeLocation();
gps=null;
}
super.onDestroy();
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}

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4、GpsActivity–>在界面上实时显示经纬度数据

package com.ljq.activity;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
import android.widget.Toast;
public class GpsActivity extends Activity {
private Double homeLat=26.0673834d; //宿舍纬度
private Double homeLon=119.3119936d; //宿舍经度
private EditText editText = null;
private MyReceiver receiver=null;
private final static String TAG=GpsActivity.class.getSimpleName();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
editText=(EditText)findViewById(R.id.editText);
//判断GPS是否可用
Log.i(TAG, UtilTool.isGpsEnabled((LocationManager)getSystemService(Context.LOCATION_SERVICE))+"");
if(!UtilTool.isGpsEnabled((LocationManager)getSystemService(Context.LOCATION_SERVICE))){
Toast.makeText(this, "GSP当前已禁用，请在您的系统设置屏幕启动。", Toast.LENGTH_LONG).show();
Intent callGPSSettingIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
return;
}
//启动服务
startService(new Intent(this, GpsService.class));
//注册广播
receiver=new MyReceiver();
IntentFilter filter=new IntentFilter();
filter.addAction("com.ljq.activity.GpsService");
registerReceiver(receiver, filter);
}
//获取广播数据
private class MyReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle=intent.getExtras();
String lon=bundle.getString("lon");
String lat=bundle.getString("lat");
if(lon!=null&&!"".equals(lon)&&lat!=null&&!"".equals(lat)){
double distance=getDistance(Double.parseDouble(lat),
Double.parseDouble(lon), homeLat, homeLon);
editText.setText("目前经纬度\n经度："+lon+"\n纬度："+lat+"\n离宿舍距离："+java.lang.Math.abs(distance));
}else{
editText.setText("目前经纬度\n经度："+lon+"\n纬度："+lat);
}
}
}
@Override
protected void onDestroy() {
//注销服务
unregisterReceiver(receiver);
//结束服务，如果想让服务一直运行就注销此句
stopService(new Intent(this, GpsService.class));
super.onDestroy();
}
/**
* 把经纬度换算成距离
*
* @param lat1 开始纬度
* @param lon1 开始经度
* @param lat2 结束纬度
* @param lon2 结束经度
* @return
*/
private double getDistance(double lat1, double lon1, double lat2, double lon2) {
float[] results = new float[1];
Location.distanceBetween(lat1, lon1, lat2, lon2, results);
return results[0];
}
}

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5、UtilTool–>工具类

package com.ljq.activity;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import org.apache.http.client.ClientProtocolException;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.telephony.NeighboringCellInfo;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import android.util.Log;
import android.widget.Toast;
public class UtilTool {
public static boolean isGpsEnabled(LocationManager locationManager) {
boolean isOpenGPS = locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER);
boolean isOpenNetwork = locationManager.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER);
if (isOpenGPS || isOpenNetwork) {
return true;
}
return false;
}
/**
* 根据基站信息获取经纬度
*
* 原理向http://www.google.com/loc/json发送http的post请求，根据google返回的结果获取经纬度
*
* @param cellIds
* @return
* @throws Exception
*/
public static Location callGear(Context ctx, ArrayList<CellInfo> cellIds) throws Exception {
String result="";
JSONObject data=null;
if (cellIds == null||cellIds.size()==0) {
UtilTool.alert(ctx, "cell request param null");
return null;
};
try {
result = UtilTool.getResponseResult(ctx, "http://www.google.com/loc/json", cellIds);
if(result.length() <= 1)
return null;
data = new JSONObject(result);
data = (JSONObject) data.get("location");
Location loc = new Location(LocationManager.NETWORK_PROVIDER);
loc.setLatitude((Double) data.get("latitude"));
loc.setLongitude((Double) data.get("longitude"));
loc.setAccuracy(Float.parseFloat(data.get("accuracy").toString()));
loc.setTime(UtilTool.getUTCTime());
return loc;
} catch (JSONException e) {
return null;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 接收Google返回的数据格式
*
* 出参：{"location":{"latitude":26.0673834,"longitude":119.3119936,
* "address":{"country":"ä¸å›½","country_code":"CN","region":"ç¦å»ºçœ","city":"ç¦å·žå¸‚",
* "street":"äº”ä¸€ä¸è·¯","street_number":"128å·"},"accuracy":935.0},
* "access_token":"2:xiU8YrSifFHUAvRJ:aj9k70VJMRWo_9_G"}
* 请求路径：http://maps.google.cn/maps/geo?key=abcdefg&q=26.0673834,119.3119936
*
* @param cellIds
* @return
* @throws UnsupportedEncodingException
* @throws MalformedURLException
* @throws IOException
* @throws ProtocolException
* @throws Exception
*/
public static String getResponseResult(Context ctx,String path, ArrayList<CellInfo> cellInfos)
throws UnsupportedEncodingException, MalformedURLException,
IOException, ProtocolException, Exception {
String result="";
Log.i(ctx.getApplicationContext().getClass().getSimpleName(),
"in param: "+getRequestParams(cellInfos));
InputStream inStream=UtilTool.sendPostRequest(path,
getRequestParams(cellInfos), "UTF-8");
if(inStream!=null){
byte[] datas=UtilTool.readInputStream(inStream);
if(datas!=null&&datas.length>0){
result=new String(datas, "UTF-8");
//Log.i(ctx.getClass().getSimpleName(), "receive result:"+result);//服务器返回的结果信息
Log.i(ctx.getApplicationContext().getClass().getSimpleName(),
"google cell receive data result:"+result);
}else{
Log.i(ctx.getApplicationContext().getClass().getSimpleName(),
"google cell receive data null");
}
}else{
Log.i(ctx.getApplicationContext().getClass().getSimpleName(),
"google cell receive inStream null");
}
return result;
}
/**
* 拼装json请求参数，拼装基站信息
*
* 入参：{'version': '1.1.0','host': 'maps.google.com','home_mobile_country_code': 460,
* 'home_mobile_network_code': 14136,'radio_type': 'cdma','request_address': true,
* 'address_language': 'zh_CN','cell_towers':[{'cell_id': '12835','location_area_code': 6,
* 'mobile_country_code': 460,'mobile_network_code': 14136,'age': 0}]}
* @param cellInfos
* @return
*/
public static String getRequestParams(List<CellInfo> cellInfos){
StringBuffer sb=new StringBuffer("");
sb.append("{");
if(cellInfos!=null&&cellInfos.size()>0){
sb.append("'version': '1.1.0',"); //google api 版本[必]
sb.append("'host': 'maps.google.com',"); //服务器域名[必]
sb.append("'home_mobile_country_code': "+cellInfos.get(0).getMobileCountryCode()+","); //移动用户所属国家代号[选中国460]
sb.append("'home_mobile_network_code': "+cellInfos.get(0).getMobileNetworkCode()+","); //移动系统号码[默认0]
sb.append("'radio_type': '"+cellInfos.get(0).getRadioType()+"',"); //信号类型[选 gsm|cdma|wcdma]
sb.append("'request_address': true,"); //是否返回数据[必]
sb.append("'address_language': 'zh_CN',"); //反馈数据语言[选中国 zh_CN]
sb.append("'cell_towers':["); //移动基站参数对象[必]
for(CellInfo cellInfo:cellInfos){
sb.append("{");
sb.append("'cell_id': '"+cellInfo.getCellId()+"',"); //基站ID[必]
sb.append("'location_area_code': "+cellInfo.getLocationAreaCode()+","); //地区区域码[必]
sb.append("'mobile_country_code': "+cellInfo.getMobileCountryCode()+",");
sb.append("'mobile_network_code': "+cellInfo.getMobileNetworkCode()+",");
sb.append("'age': 0"); //使用好久的数据库[选默认0表示使用最新的数据库]
sb.append("},");
}
sb.deleteCharAt(sb.length()-1);
sb.append("]");
}
sb.append("}");
return sb.toString();
}
/**
* 获取UTC时间
*
* UTC + 时区差＝本地时间(北京为东八区)
*
* @return
*/
public static long getUTCTime() {
//取得本地时间
Calendar cal = Calendar.getInstance(Locale.CHINA);
//取得时间偏移量
int zoneOffset = cal.get(java.util.Calendar.ZONE_OFFSET);
//取得夏令时差
int dstOffset = cal.get(java.util.Calendar.DST_OFFSET);
//从本地时间里扣除这些差量，即可以取得UTC时间
cal.add(java.util.Calendar.MILLISECOND, -(zoneOffset + dstOffset));
return cal.getTimeInMillis();
}
/**
* 初始化，记得放在onCreate()方法里初始化，获取基站信息
*
* @return
*/
public static ArrayList<CellInfo> init(Context ctx) {
ArrayList<CellInfo> cellInfos = new ArrayList<CellInfo>();
TelephonyManager tm = (TelephonyManager) ctx.getSystemService(Context.TELEPHONY_SERVICE);
//网络制式
int type = tm.getNetworkType();
/**
* 获取SIM卡的IMSI码
* SIM卡唯一标识：IMSI 国际移动用户识别码（IMSI：International Mobile Subscriber Identification Number）是区别移动用户的标志，
* 储存在SIM卡中，可用于区别移动用户的有效信息。IMSI由MCC、MNC、MSIN组成，其中MCC为移动国家号码，由3位数字组成，
* 唯一地识别移动客户所属的国家，我国为460；MNC为网络id，由2位数字组成，
* 用于识别移动客户所归属的移动网络，中国移动为00，中国联通为01,中国电信为03；MSIN为移动客户识别码，采用等长11位数字构成。
* 唯一地识别国内GSM移动通信网中移动客户。所以要区分是移动还是联通，只需取得SIM卡中的MNC字段即可
*/
String imsi = tm.getSubscriberId();
alert(ctx, "imsi: "+imsi);
//为了区分移动、联通还是电信，推荐使用imsi来判断(万不得己的情况下用getNetworkType()判断，比如imsi为空时)
if(imsi!=null&&!"".equals(imsi)){
alert(ctx, "imsi");
if (imsi.startsWith("46000") || imsi.startsWith("46002")) {// 因为移动网络编号46000下的IMSI已经用完，所以虚拟了一个46002编号，134/159号段使用了此编号
// 中国移动
mobile(cellInfos, tm);
} else if (imsi.startsWith("46001")) {
// 中国联通
union(cellInfos, tm);
} else if (imsi.startsWith("46003")) {
// 中国电信
cdma(cellInfos, tm);
}
}else{
alert(ctx, "type");
// 在中国，联通的3G为UMTS或HSDPA，电信的3G为EVDO
// 在中国，移动的2G是EGDE，联通的2G为GPRS，电信的2G为CDMA
// String OperatorName = tm.getNetworkOperatorName();
//中国电信
if (type == TelephonyManager.NETWORK_TYPE_EVDO_A
|| type == TelephonyManager.NETWORK_TYPE_EVDO_0
|| type == TelephonyManager.NETWORK_TYPE_CDMA
|| type ==TelephonyManager.NETWORK_TYPE_1xRTT){
cdma(cellInfos, tm);
}
//移动(EDGE（2.75G）是GPRS（2.5G）的升级版，速度比GPRS要快。目前移动基本在国内升级普及EDGE，联通则在大城市部署EDGE。)
else if(type == TelephonyManager.NETWORK_TYPE_EDGE
|| type == TelephonyManager.NETWORK_TYPE_GPRS ){
mobile(cellInfos, tm);
}
//联通(EDGE（2.75G）是GPRS（2.5G）的升级版，速度比GPRS要快。目前移动基本在国内升级普及EDGE，联通则在大城市部署EDGE。)
else if(type == TelephonyManager.NETWORK_TYPE_GPRS
||type == TelephonyManager.NETWORK_TYPE_EDGE
||type == TelephonyManager.NETWORK_TYPE_UMTS
||type == TelephonyManager.NETWORK_TYPE_HSDPA){
union(cellInfos, tm);
}
}
return cellInfos;
}
/**
* 电信
*
* @param cellInfos
* @param tm
*/
private static void cdma(ArrayList<CellInfo> cellInfos, TelephonyManager tm) {
CdmaCellLocation location = (CdmaCellLocation) tm.getCellLocation();
CellInfo info = new CellInfo();
info.setCellId(location.getBaseStationId());
info.setLocationAreaCode(location.getNetworkId());
info.setMobileNetworkCode(String.valueOf(location.getSystemId()));
info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
info.setRadioType("cdma");
cellInfos.add(info);
//前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
// 获得邻近基站信息
List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
int size = list.size();
for (int i = 0; i < size; i++) {
CellInfo cell = new CellInfo();
cell.setCellId(list.get(i).getCid());
cell.setLocationAreaCode(location.getNetworkId());
cell.setMobileNetworkCode(String.valueOf(location.getSystemId()));
cell.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
cell.setRadioType("cdma");
cellInfos.add(cell);
}
}
/**
* 移动
*
* @param cellInfos
* @param tm
*/
private static void mobile(ArrayList<CellInfo> cellInfos,
TelephonyManager tm) {
GsmCellLocation location = (GsmCellLocation)tm.getCellLocation();
CellInfo info = new CellInfo();
info.setCellId(location.getCid());
info.setLocationAreaCode(location.getLac());
info.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));
info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
info.setRadioType("gsm");
cellInfos.add(info);
//前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
// 获得邻近基站信息
List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
int size = list.size();
for (int i = 0; i < size; i++) {
CellInfo cell = new CellInfo();
cell.setCellId(list.get(i).getCid());
cell.setLocationAreaCode(location.getLac());
cell.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));
cell.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
cell.setRadioType("gsm");
cellInfos.add(cell);
}
}
/**
* 联通
*
* @param cellInfos
* @param tm
*/
private static void union(ArrayList<CellInfo> cellInfos, TelephonyManager tm) {
GsmCellLocation location = (GsmCellLocation)tm.getCellLocation();
CellInfo info = new CellInfo();
//经过测试，获取联通数据以下两行必须去掉，否则会出现错误，错误类型为JSON Parsing Error
//info.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));
//info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
info.setCellId(location.getCid());
info.setLocationAreaCode(location.getLac());
info.setMobileNetworkCode("");
info.setMobileCountryCode("");
info.setRadioType("gsm");
cellInfos.add(info);
//前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
// 获得邻近基站信息
List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
int size = list.size();
for (int i = 0; i < size; i++) {
CellInfo cell = new CellInfo();
cell.setCellId(list.get(i).getCid());
cell.setLocationAreaCode(location.getLac());
cell.setMobileNetworkCode("");
cell.setMobileCountryCode("");
cell.setRadioType("gsm");
cellInfos.add(cell);
}
}
/**
* 提示
*
* @param ctx
* @param msg
*/
public static void alert(Context ctx,String msg){
Toast.makeText(ctx, msg, Toast.LENGTH_LONG).show();
}
/**
* 发送post请求，返回输入流
*
* @param path 访问路径
* @param params json数据格式
* @param encoding 编码
* @return
* @throws UnsupportedEncodingException
* @throws MalformedURLException
* @throws IOException
* @throws ProtocolException
*/
public static InputStream sendPostRequest(String path, String params, String encoding)
throws UnsupportedEncodingException, MalformedURLException,
IOException, ProtocolException {
byte[] data = params.getBytes(encoding);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
//application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据
conn.setRequestProperty("Content-Type", "application/x-javascript; charset="+ encoding);
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
conn.setConnectTimeout(5 * 1000);
OutputStream outStream = conn.getOutputStream();
outStream.write(data);
outStream.flush();
outStream.close();
if(conn.getResponseCode()==200)
return conn.getInputStream();
return null;
}
/**
* 发送get请求
*
* @param path 请求路径
* @return
* @throws Exception
*/
public static String sendGetRequest(String path) throws Exception {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("GET");
InputStream inStream = conn.getInputStream();
byte[] data = readInputStream(inStream);
String result = new String(data, "UTF-8");
return result;
}
/**
* 从输入流中读取数据
* @param inStream
* @return
* @throws Exception
*/
public static byte[] readInputStream(InputStream inStream) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();//网页的二进制数据
outStream.close();
inStream.close();
return data;
}
}