Here is the Java function:
public class PostDataGetRes extends AsyncTask<String,String,String> { protected voID onPreExecute() { super.onPreExecute(); } @OverrIDe protected String doInBackground(String... strings) { try { postRData(); } catch (NullPointerException e) { e.printstacktrace(); } catch (Exception e) { e.printstacktrace(); } return null; } @OverrIDe protected voID onPostExecute(String lenghtOffile) { // do stuff after posting data } } public voID postRData() { String result = ""; inputStream isr = null; final String email = editEmail.getText().toString(); final String pass = editPass.getText().toString(); // Create a new httpClIEnt and Post header httpClIEnt httpclIEnt = new DefaulthttpClIEnt(); httpPost httppost = new httpPost("http://website.com/appservice.PHP"); try { // Add your data List<nameValuePair> nameValuePairs = new ArrayList<nameValuePair>(2); nameValuePairs.add(new BasicnameValuePair("ID",email)); nameValuePairs.add(new BasicnameValuePair("stringdata",pass)); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); // Execute http Post Request httpResponse response = httpclIEnt.execute(httppost); resultVIEw.setText("Inserted"); httpentity entity = response.getEntity(); isr = entity.getContent(); //convert response to string try{ BufferedReader reader = new BufferedReader(new inputStreamReader(isr,"iso-8859-1"),8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readline()) != null) { sb.append(line + "\n"); } isr.close(); result=sb.toString(); } catch(Exception e){ Log.e("log_tag","Error converting result "+e.toString()); } //parse Json data try { String s = ""; JsONArray jArray = new JsONArray(result); for(int i=0; i<jArray.length();i++){ JsONObject Json = jArray.getJsONObject(i); s = s + "name : "+Json.getString("first_name")+"\n\n"; //"User ID : "+Json.getInt("user_ID")+"\n"+ //"name : "+Json.getString("first_name")+"\n"+ //"Email : "+Json.getString("email")+"\n\n"; } resultVIEw.setText(s); } catch (Exception e) { // Todo: handle exception Log.e("log_tag","Error Parsing Data "+e.toString()); } } catch (ClIEntProtocolException e) { // Todo auto-generated catch block } catch (IOException e) { // Todo auto-generated catch block } resultVIEw.setText("Done"); }@H_403_7@ And here is PHP code:
if($ID){ $query = MysqL_query("SELECT first_name FROM users where email = '$ID' "); while($row=MysqL_fetch_assoc($query)){ $selectedData[]=$row; } print(Json_encode($selectedData)); }@H_403_7@ 请帮助我,到目前为止我已经尝试过,但无法取得任何成果.请帮助我如何在查询执行后从PHP文件中获得响应.
解决方法 首先要确保从您的网站获得正确的JsON对象 – 尝试将其打印为Toast.makeText().到目前为止,Web浏览器保留了HTML注释,androID将其作为响应. AsyncTask对象和类的设计不是按照您提供的方式进行的,也不能在doInBackground()中进行任何UI *** 作. AsyncTask的制作方式是不阻止GUI.
以下是使用AsyncTask类中的方法的一个不同的示例：
class Logging extends AsyncTask<String,VoID>{ JsONObject Json=null; String output=""; String log=StringCheck.buildspaces(login.getText().toString()); String pas=StringCheck.buildspaces(password.getText().toString()); String url="http://www.mastah.esy.es/webservice/login.PHP?login="+log+"&pass="+pas; protected voID onPreExecute() { Toast.makeText(getApplicationContext(),"Operation pending,please wait",Toast.LENGTH_SHORT).show(); } @OverrIDe protected VoID doInBackground(String... params) { httpClIEnt clIEnt = new DefaulthttpClIEnt(); httpGet request = new httpGet(url); request.addheader("User-Agent","User-Agent"); httpResponse response; try { response = clIEnt.execute(request); BufferedReader br = new BufferedReader(new inputStreamReader(response.getEntity().getContent())); String line=""; StringBuilder result = new StringBuilder(); while ((line = br.readline()) != null) { result.append(line); } output=result.toString(); } catch (ClIEntProtocolException e) { Toast.makeText(getApplicationContext(),"Connection problems",Toast.LENGTH_LONG).show(); } catch (IOException e) { Toast.makeText(getApplicationContext(),"Conversion problems",Toast.LENGTH_LONG).show(); } return null; } @OverrIDe protected voID onPostExecute(VoID w) { try { Json = new JsONObject(output); if(Json.getInt("err")==1){ Toast.makeText(getApplicationContext(),Json.getString("msg"),Toast.LENGTH_LONG).show(); }else{ String ID_user="-1"; Toast.makeText(getApplicationContext(),Toast.LENGTH_LONG).show(); JsONArray arr = Json.getJsONArray("data"); for(int i =0;i<arr.length();i++){ JsONObject o = arr.getJsONObject(i); ID_user = o.getString("ID_user"); } User.getInstance().setname(log); User.getInstance().setID(Integer.valueOf(ID_user)); Intent i = new Intent(getApplicationContext(),discover.class); startActivity(i); } } catch (JsONException e) { } super.onPostExecute(w); } }@H_403_7@ PHP文件内容：
$data = array( 'err' => 0,'msg' => "",'data' => array(),);$MysqLi = new MysqLi($dbhost,$dbuser,$dbpass,$dbname);if($MysqLi->connect_errno){ $data['err'] = 1; $data['msg'] = "Brak polacZenia z baza"; exit(Json_encode($data));}if(isset($_GET['login']) && isset($_GET['pass'])){ $MysqLi->query("SET CHaraCTER SET 'utf8';"); $query = $MysqLi->query("SELECT banned.ID_user FROM banned JOIN user ON user.ID_user = banned.ID_user WHERE user.login ='{$_GET['login']}' liMIT 1;"); if($query->num_rows){ $data['err']=1; $data['msg']="User banned"; exit(Json_encode($data)); }else{ $query = $MysqLi->query("SELECT login FROM user WHERE login='{$_GET['login']}' liMIT 1;"); if($query->num_rows){ $query = $MysqLi->query("SELECT pass FROM user WHERE pass ='{$_GET['pass']}' liMIT 1;"); if($query->num_rows){ $data['msg']="Logged IN!"; $query = $MysqLi->query("SELECT ID_user FROM user WHERE login='{$_GET['login']}' liMIT 1;"); $data['data'][]=$query->fetch_assoc(); exit(Json_encode($data)); }else{ $data['err']=1; $data['msg']="Wrong login credentials."; exit(Json_encode($data)); } }else{ $data['err']=1; $data['msg']="This login doesn't exist."; exit(Json_encode($data)); } }}else{ $data['err']=1; $data['msg']="Wrong login credentials"; exit(Json_encode($data));}@H_403_7@ 我为我的应用程序创建了小字典$data.我使用它的err键作为标志来知道是否出现任何错误,msg通知用户有关 *** 作结果和发送JsON对象的数据.
你想要if(response == true),如果它存在的东西类似于我在AsyncTask中的onPostExecute(VoID w)方法中使用的构造：
if(Json.getInt("err")==1){ //something went wrong}else{ //everything is okay,get JsON,inform user,start new Activity}@H_403_7@ 这也是我使用$data [‘data’]获取JsON响应的方式：
if($query->num_rows){ while($res=$query->fetch_assoc()){ $data['data'][]=$res; } exit(Json_encode($data));}@H_403_7@ 总结 以上是内存溢出为你收集整理的java – 为什么函数不能从android中的php获取数据？全部内容，希望文章能够帮你解决java – 为什么函数不能从android中的php获取数据？所遇到的程序开发问题。
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