无法处理安卓向服务器发出的后置请求，并将结果接收回安卓

我对此进行了有关如何同时发布请求并接收来自服务器的响应的研究，我终于得到了一些合理的演练，但它不起作用。请帮忙。

       button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        try{
        process();
    } catch(Exception ex){
Log.e("Url Error Encoding", "Url Error Encoding");
        }
    }
});
    }
public void process() throws UnsupportedEncodingException{
     Prog = spinner1.getSelectedItem().toString();
     Dept = spinner2.getSelectedItem().toString();
     Session = spinner3.getSelectedItem().toString();
     Semester = spinner4.getSelectedItem().toString();
    Level = spinner5.getSelectedItem().toString();
    Matric = matric.getText().toString();
    SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
    College = sharedPreferences.getString(Config.COLLEGE_SHARED_PREF,"Not Available");
   // Toast.makeText(ProfileActivity.this, Matric + College, Toast.LENGTH_SHORT).show();
   // content.setText(Prog);

    String data = URLEncoder.encode("program", "UTF-8")
            + "=" + URLEncoder.encode(Prog, "UTF-8");
    data += "&" + URLEncoder.encode("dept", "UTF-8") + "="
            + URLEncoder.encode(Dept, "UTF-8");
    data += "&" + URLEncoder.encode("session", "UTF-8") + "="
            + URLEncoder.encode(Session, "UTF-8");
    data += "&" + URLEncoder.encode("semester", "UTF-8") + "="
            + URLEncoder.encode(Semester, "UTF-8");
    data += "&" + URLEncoder.encode("level", "UTF-8") + "="
            + URLEncoder.encode(Level, "UTF-8");
    data += "&" + URLEncoder.encode("college", "UTF-8") + "="
            + URLEncoder.encode(College, "UTF-8");
    data += "&" + URLEncoder.encode("matric", "UTF-8") + "="
            + URLEncoder.encode(Matric, "UTF-8");
    String text = "";
    BufferedReader reader=null;
    try{

发送数据

        URL url = new URL("http://www.example.com/locator/checkresult.php");
        // Send POST data request
        URLConnection conn = url.openConnection();
        conn.setDoOutput(true);
        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write( data );
        wr.flush();
        // Get the server response
        reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder sb = new StringBuilder();
        String line = null;
        // Read Server Response
        while((line = reader.readLine()) != null)
        {
            // Append server response in string
            sb.append(line + "'n");
        }
        text = sb.toString();

    } catch(Exception ex){
        ex.printStackTrace();
                }
finally {
        try
        {
            reader.close();
        }
        catch(Exception ex) {
            ex.printStackTrace();
        }
    }
    // Show response on activity
    content.setText(text);
}

我的 php 代码

     <?php
mysql_connect("localhost", "root", "zzz") or die(mysql_error());
mysql_select_db("sis");
$conn = mysql_connect("localhost", "root", "zzz");
$college  = urldecode($_POST['college']); 
$program  = urldecode($_POST['program']); 
$level  = urldecode($_POST['level']); 
$department = urldecode($_POST['dept']); 
$semester  = urldecode($_POST['semester']); 
$session  = urldecode($_POST['session']); 
$matric  = urldecode($_POST['matric']); 
  print "$program $level $department";
?>

我的个人资料.xml

    <?xml version="1.0" encoding="UTF-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent">
   <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="10dp">
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Large Text" android:id="@+id/textView" android:layout_marginBottom="20dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:id="@+id/textView2" android:layout_marginBottom="20dp" />
      <TableLayout android:id="@+id/table" android:layout_width="wrap_content" android:layout_height="25dp" android:focusableInTouchMode="true" android:focusable="true" />
      <TextView android:id="@+id/content" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="5dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Program" android:layout_marginBottom="5dp" />
      <Spinner android:id="@+id/programme" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Level" android:layout_marginBottom="5dp" />
      <Spinner android:id="@+id/level" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Department" android:layout_marginBottom="5dp" />
      <Spinner android:id="@+id/dept" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Semester" android:layout_marginBottom="5dp" />
      <Spinner android:id="@+id/semester" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Session" android:layout_marginBottom="5dp" />
      <Spinner android:id="@+id/session" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
      <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="8dp" android:textStyle="bold" android:text="Enter your matric number" />
      <EditText android:id="@+id/rmatric" android:layout_width="match_parent" android:layout_height="50dp" />
      <Button android:id="@+id/checkresult" android:layout_width="match_parent" android:layout_height="match_parent" android:text="Check Result" />
   </LinearLayout>
</ScrollView>

请帮忙。谢谢。