Android 服務(wù)端將位置信息發(fā)送給客戶端

AndroidStudio Eclipse

服務(wù)端Servlet調(diào)用Dao層在數(shù)據(jù)庫中查找數(shù)據(jù)，在servlet中將查找到的數(shù)據(jù)匯集成json字符串（json數(shù)組形式）。

服務(wù)端：

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// response.setContentType('text/plain; charset=UTF-8'); request.setCharacterEncoding('UTF-8'); ServerToParentDao stpDao = new ServerToParentDao();// String num = mtpDao.query();// System.out.println(num); PrintWriter out = response.getWriter(); StringBuffer sb = new StringBuffer(); sb.append(’[’); List<Address> addrList = stpDao.queryOne(); for (Address address : addrList) { sb.append(’{’).append(''id':').append('' + address.getId() + '').append(','); sb.append(''latitude':').append(''' + address.getLatitude() + ''').append(','); sb.append(''longitude':').append(''' + address.getLongitude() + ''').append(','); sb.append(''time':'').append(address.getTime()); sb.append(''}').append(','); } sb.deleteCharAt(sb.length() - 1); sb.append(’]’); out.write(sb.toString()); System.out.println(sb.toString());// request.setAttribute('json',sb.toString());// request.getRequestDispatcher('watch.jsp').forward(request, response);// out.write(num);// response.getOutputStream().write(mtpDao.query().getBytes('UTF-8')); out.flush(); out.close();// System.err.println(request.getParameter(''));// System.out.println(code); System.out.println('連接成功');// PrintWriter printWriter = response.getWriter();// printWriter.print('客戶端你好，數(shù)據(jù)連接成功！');// printWriter.flush();// printWriter.close(); }

客戶端：

sendButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {HttpPost httpRequest = new HttpPost('http://192.168.159.1:8080/MyAndroidServer/ServerToParentServlet');List<NameValuePair> params = new ArrayList<NameValuePair>();//String str = '1';//params.add(new BasicNameValuePair('Code', str));Log.i('MY3', 'Has Done');try {// httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//設(shè)置請求參數(shù)項 HttpClient httpClient = new DefaultHttpClient(); HttpResponse httpResponse = httpClient.execute(httpRequest);//執(zhí)行請求返回響應(yīng) if (httpResponse.getStatusLine().getStatusCode() == 200) {//判斷是否請求成功 HttpEntity entity = httpResponse.getEntity(); if (entity != null) { System.out.println('---------');// System.out.println('Respone content' + EntityUtils.toString(entity, 'UTF-8')); Intent intent = new Intent(ParentRequest.this,MainActivity.class); intent.putExtra('jsonString',EntityUtils.toString(entity, 'UTF-8')); startActivity(intent); }Log.i('MY2', 'Has Done'); } else { Toast.makeText(ParentRequest.this, '沒有獲取到Android服務(wù)器端的響應(yīng)！', Toast.LENGTH_LONG).show(); }} catch (ClientProtocolException e) { e.printStackTrace();} catch (UnsupportedEncodingException e) { e.printStackTrace();} catch (IOException e) { e.printStackTrace();} } });

請求地址書寫形式：http://主機IP地址：端口號/項目名/action名

HttpPost方式建立連接，HttpResponse.getEntity()獲取響應(yīng)信息，EntityUtils.toString(entity, “UTF-8”)將entity轉(zhuǎn)為String字符串，Intent將JSON字符串傳遞到其他activity頁面中去。

JSON字符串解析類：

public static List<Address> getAddress(String jsonStr) throws JSONException { /******************* 解析 ***********************/ // 初始化list數(shù)組對象 List<Address> mList = new ArrayList<Address>(); Address address = new Address(); JSONArray array = new JSONArray(jsonStr); for (int i = 0; i < array.length(); i++) { JSONObject jsonObject = array.getJSONObject(i); address = new Address(jsonObject.getInt('id'), jsonObject.getString('latitude'), jsonObject.getString('longitude'), jsonObject.getString('time')); mList.add(address); } return mList; }

我這個是當(dāng)時在做一個兒童定位寫的，數(shù)據(jù)庫設(shè)計沒思考全面，思維比較狹隘。

應(yīng)該思考到的是兒童信息表中兒童信息要跟父母表中父母信息對應(yīng)起來，即這APP是給多對父母和孩子使用的，而不是一對父母與孩子。

服務(wù)端也不應(yīng)該是使用本地的，應(yīng)該使用云服務(wù)器，這樣就不會被同一局域網(wǎng)所限制。

代碼實現(xiàn)

客戶端:

HttpPost httpRequest = new HttpPost('http://192.168.159.1:8080/MyAndroidServer/ChildrenToServerServlet'); List<NameValuePair> params = new ArrayList<NameValuePair>(); SimpleDateFormat simpleDateFormat = new SimpleDateFormat('yyyy-MM-dd-HH:mm'); Date date = new Date(System.currentTimeMillis()); String str=simpleDateFormat.format(date); System.out.println(str); params.add(new BasicNameValuePair('Time', str)); params.add(new BasicNameValuePair('Latitude',latitude)); params.add(new BasicNameValuePair('Longitude', longitude)); try {httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//設(shè)置請求參數(shù)項HttpClient httpClient = new DefaultHttpClient();HttpResponse httpResponse = httpClient.execute(httpRequest);//執(zhí)行請求返回響應(yīng)if(httpResponse.getStatusLine().getStatusCode() == 200){//判斷是否請求成功// Toast.makeText(ChildrenToServerActivity.this, EntityUtils.toString(httpResponse.getEntity()), Toast.LENGTH_LONG).show(); Intent intent = new Intent(); intent.setAction('cn.abel.action.broadcast'); intent.putExtra('Response', EntityUtils.toString(httpResponse.getEntity())); context.sendBroadcast(intent);}else{// Toast.makeText(MainActivity.this, '沒有獲取到Android服務(wù)器端的響應(yīng)！', Toast.LENGTH_LONG).show(); Intent intent = new Intent(); intent.setAction('cn.abel.action.broadcast'); intent.putExtra('Response', '沒有獲取到Android服務(wù)器端的響應(yīng)！'); context.sendBroadcast(intent);} } catch (UnsupportedEncodingException e) {e.printStackTrace(); } catch (IOException e) {e.printStackTrace(); }

params.add(new BasicNameValuePair(“Time”, str));

Time是str的變量名，用于服務(wù)端接收數(shù)據(jù)用的。這是用來添加要傳遞給服務(wù)端的數(shù)據(jù)，為String字符串形式。

服務(wù)端：

public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { response.setContentType('text/plain; charset=UTF-8'); request.setCharacterEncoding('UTF-8'); String time = request.getParameter('Time'); String latitude = request.getParameter('Latitude'); String longitude = request.getParameter('Longitude'); ChildrenToAddressDao addressDao = new ChildrenToAddressDao(); addressDao.insert(latitude, longitude, time); System.err.println(request.getParameter('Time')); System.err.println(request.getParameter('Latitude')); System.err.println(request.getParameter('Longitude')); PrintWriter printWriter = response.getWriter(); printWriter.print('客戶端你好，數(shù)據(jù)連接成功！'); printWriter.flush(); printWriter.close(); }

request.getParameter(“變量名”)是用來接收客戶端對應(yīng)變量名的數(shù)據(jù)。addressDao.insert()是我自己定義的方法，將接收到的數(shù)據(jù)存入MySQL中。

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