Android开发新手,发现下面的代码连接到mysql数据库,但在登录或注册后似乎在运行时出现。
package applications.loginandregister;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.renderscript.ScriptGroup;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.Buffer;
import javax.net.ssl.HttpsURLConnection;
/**
* Created by Mitch on 2016-06-04.
*/
public class BackgroundTask extends AsyncTask<String,Void,String>
{
SharedPreferences preferences;
SharedPreferences.Editor editor;
Context context;
BackgroundTask(Context ctx){
this.context = ctx;
}
@Override
protected String doInBackground(String... params) {
preferences = context.getSharedPreferences("MYPREFS", Context.MODE_PRIVATE);
editor = preferences.edit();
editor.putString("flag","0");
editor.commit();
String urlRegistration = "http://domain.com/LoginAndRegister-register.php";
String urlLogin = "http://domain.com/LoginAndRegister-login.php";
String task = params[0];
if(task.equals("register")){
String regName = params[1];
String regEmail = params[2];
String regPassword = params[3];
try {
URL url = new URL(urlRegistration);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8");
BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
String myData = URLEncoder.encode("identifier_name","UTF-8")+"="+URLEncoder.encode(regName,"UTF-8")+"&"
+URLEncoder.encode("identifier_email","UTF-8")+"="+URLEncoder.encode(regEmail,"UTF-8")+"&"
+URLEncoder.encode("identifier_password","UTF-8")+"="+URLEncoder.encode(regPassword,"UTF-8");
bufferedWriter.write(myData);
bufferedWriter.flush();
bufferedWriter.close();
InputStream inputStream = httpURLConnection.getInputStream();
inputStream.close();
editor.putString("flag","register");
editor.commit();
return "Successfully Registered " + regName;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
if(task.equals("login")){
String loginEmail = params[1];
String loginPassword = params[2];
try {
URL url = new URL(urlLogin);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
//send the email and password to the database
OutputStream outputStream = httpURLConnection.getOutputStream();
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8");
BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
String myData = URLEncoder.encode("identifier_loginEmail","UTF-8")+"="+URLEncoder.encode(loginEmail,"UTF-8")+"&"
+URLEncoder.encode("identifier_loginPassword","UTF-8")+"="+URLEncoder.encode(loginPassword,"UTF-8");
bufferedWriter.write(myData);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
//get response from the database
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String dataResponse = "";
String inputLine = "";
while((inputLine = bufferedReader.readLine()) != null){
dataResponse += inputLine;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
System.out.println(dataResponse);
editor.putString("flag","login");
editor.commit();
return dataResponse;
} catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
//This method willbe called when doInBackground completes... and it will return the completion string which
//will display this toast.
@Override
protected void onPostExecute(String s) {
String flag = preferences.getString("flag","0");
if(flag.equals("register")) {
Toast.makeText(context,s,Toast.LENGTH_LONG).show();
}
if(flag.equals("login")){
String test = "false";
String name = "";
String email = "";
String[] serverResponse = s.split("[,]");
test = serverResponse[0];
name = serverResponse[1];
email = serverResponse[2];
if(test.equals("true")){
editor.putString("name",name);
editor.commit();
editor.putString("email",email);
editor.commit();
Intent intent = new Intent(context,LogginIn.class);
context.startActivity(intent);
}else{
display("Login Failed...", "That email and password do not match our records :(.");
}
}else{
display("Login Failed...","Something weird happened :(.");
}
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
public void display(String title, String message){
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
}
这是我在logcat中捕获的内容
applications.loginandregister E/AndroidRuntime: FATAL EXCEPTION: main
Process: applications.loginandregister, PID: 11263
java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
at applications.loginandregister.BackgroundTask.onPostExecute(BackgroundTask.java:164)
at applications.loginandregister.BackgroundTask.onPostExecute(BackgroundTask.java:32)
at android.os.AsyncTask.finish(AsyncTask.java:651)
at android.os.AsyncTask.access$500(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)