我能够从android注册到服务器但不能获得JSon响应。 继承我的代码,它应该在userareaActivity中显示输出:
my activity_main.xml
element.getAttribute("value")
主要活动:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="twin.com.heyjson.MainActivity">
<LinearLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="vertical"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="8dp"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0">
<TextView
android:id="@+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Email" />
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
/>
<TextView
android:id="@+id/textView5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Contact number" />
<EditText
android:id="@+id/et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
/>
<TextView
android:id="@+id/textView6"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="password" />
<EditText
android:id="@+id/et3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
/>
<Button
android:id="@+id/btn1"
android:layout_marginTop="40sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Register"
android:onClick="hit"/>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
Activity_user_area.xml:
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.io.InputStream;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.net.ResponseCache;
import java.net.HttpURLConnection;
import java.net.URL;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
EditText emailview, numberview, pwview;
Button registerview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
emailview = (EditText) findViewById(R.id.et1);
numberview = (EditText) findViewById(R.id.et2);
pwview = (EditText) findViewById(R.id.et3);
registerview = (Button) findViewById(R.id.btn1);
}
public void hit(View v) {
String email = emailview.getText().toString();
String contact = numberview.getText().toString();
String pw = pwview.getText().toString();
JSONObject a = new JSONObject();
try {
a.put("mail", email);
a.put("num", contact);
a.put("pass", pw);
} catch (JSONException e) {
e.printStackTrace();
}
if (a.length() > 0) {
new SendJsonDataToServer().execute(String.valueOf(a));
}
}
class SendJsonDataToServer extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String JsonResponse = null;
String JsonDATA = params[0];
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
try {
URL url = new URL("example.com");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
// is output buffer writter
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Content-Type", "application/json");
urlConnection.setRequestProperty("Accept", "application/json");
//set headers and method
Writer writer = new BufferedWriter(new OutputStreamWriter(urlConnection.getOutputStream(), "UTF-8"));
writer.write(JsonDATA);
// json data
writer.close();
InputStream inputStream = urlConnection.getInputStream();
//input stream
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String inputLine;
while ((inputLine = reader.readLine()) != null)
buffer.append(inputLine + "\n");
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
JsonResponse = buffer.toString();
//response data
Log.i("o/p:", JsonResponse);
try {
//send to post execute
return JsonResponse;
} catch (Exception e){
}
return null;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("wtf", "Error closing stream", e);
}
}
}
return null;
}
@Override
protected void onPostExecute(String s) {
Log.i("Here it is:",s);
Log.e("Here it is:",s);
try {
JSONObject jsonResponse = new JSONObject(s);
int status= jsonResponse.getInt("status");
String message =jsonResponse.getString("message");
JSONArray arr = jsonResponse.getJSONArray("data");
if ( status==1){
for (int i=0;i<arr.length();i++) {
JSONObject lol = arr.getJSONObject(i);
String token = lol.getString("token");
String email = lol.getString("email");
Intent intent = new Intent(MainActivity.this, UserAreaActivity.class);
intent.putExtra("message", message);
intent.putExtra("token", token);
intent.putExtra("email", email);
startActivity(intent);
}}
else {
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Registration failed").setNegativeButton("retry",null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}}
}
我的清单文件:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="twin.com.heyjson.UserAreaActivity">
<LinearLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="vertical"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="8dp"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintVertical_bias="1.0">
<TextView
android:id="@+id/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Message" />
<TextView
android:id="@+id/tv2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="token" />
<TextView
android:id="@+id/tv3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="email" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
UserAreaActivity :
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class UserAreaActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_area);
setContentView(R.layout.activity_user_area);
final TextView tar =(TextView)findViewById(R.id.tv1);
final TextView zar =(TextView)findViewById(R.id.tv2);
final TextView par =(TextView)findViewById(R.id.tv3);
Intent intent=getIntent();
String message=intent.getStringExtra("message");
String token =intent.getStringExtra("token");
String email=intent.getStringExtra("email");
tar.setText(message);
zar.setText(token);
par.setText(email);
}
}
答案 0 :(得分:0)
在盲目阅读输入流之前,尝试使用
检查响应状态int code = urlConnection.getResponseCode()
如果代码是200系列中的任何一个,那么您已成功将数据发布到服务器。根据代码值,从urlConnection.getInputStream()
或urlConnection.getErrorStream()
干杯!!
答案 1 :(得分:0)
您用于发布数据的方法是正确的,但您正在创建具有POST属性的HttpUrlConnection,此连接旨在将您的数据POST到某个特定的Web服务端点,该端点接受数据作为POST参数。那么如何使用相同的HttpUrlConnection从服务器获取数据呢?在这种情况下,您需要使用不同的URL创建不同的HttpUrlConnection,以便从服务器获取数据。理想情况下,您不应该使用相同的AsyncTask进行POST,而来自Web服务器的GET数据对POST和GET使用不同。