android中的安全HTTP调用

我如何确保http调用每次我从我的应用程序，也需要有超时，以便任何其他用户不能使用相同的链接从任何浏览器。

我正在寻找android解决方案，特别是html形式。

请帮帮我。无法解决这个问题，不知道该往哪个方向走。

Thanks in Advance.

我附加了PHP和Android的代码，其中发布请求并返回响应，但没有安全附加，任何用户都可以通过调用相同的HTTP响应从浏览器随时获得相同的响应…

Android代码:

public class CustomizedListView extends Activity {
    // All static variables
    static final String URL = "http://example.com/getmsgs/strno=123";
    // XML node keys
    static final String KEY_SONG = "song"; // parent node
    static final String KEY_ID = "id";
    static final String KEY_TITLE = "title";
    static final String KEY_ARTIST = "artist";
    static final String KEY_DURATION = "duration";
    static final String KEY_THUMB_URL = "thumb_url";
    ListView list;
    LazyAdapter adapter;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
        JSONObject json = JSONfunctions.getJSONfromURL(URL);

        try {
            JSONObject arr2 = json.getJSONObject("feed");
            JSONArray arr = arr2.getJSONArray("entry");
            for (int i = 0; i < arr.length(); i++) {
                JSONObject e1 = arr.getJSONObject(i);
                JSONArray arr3 = e1.getJSONArray("im:image");
                JSONObject arr8 = e1.getJSONObject("im:name");
                JSONObject arr10 = e1.getJSONObject("im:artist");
                    JSONObject e12 = arr3.getJSONObject(0);
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            map.put(KEY_THUMB_URL,  e12.getString("label"));
            map.put(KEY_ARTIST, arr8.getString("label"));
            map.put(KEY_TITLE, arr10.getString("label"));
            // adding HashList to ArrayList
            songsList.add(map);
            }
        } catch (JSONException e) {
            // Log.e("log_tag", "Error parsing data "+e.toString());
            Toast.makeText(getBaseContext(),
                    "Network communication error!", 5).show();
        }

        list=(ListView)findViewById(R.id.list);
        // Getting adapter by passing xml data ArrayList
        adapter=new LazyAdapter(this, songsList);        
        list.setAdapter(adapter);
        // Click event for single list row
        list.setOnItemClickListener(new OnItemClickListener() {
            @SuppressWarnings("unchecked")
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                HashMap<String, String> o = (HashMap<String, String>) list.getItemAtPosition(position);
                Toast.makeText(CustomizedListView.this, "ID '" + o.get("KEY_TITLE") + "' was clicked.", Toast.LENGTH_SHORT).show(); 
            }
        });     
    }   
}

PHP代码:

<?php
    $strno=$_GET['strno'];
    if (isset($strno))
    {
            $connect=mysql_connect("localhost","test","test") or die ('Connection error!!!');
            mysql_select_db("test") or die ('Database error!!!');
        $query=mysql_query("select sno FROM users  where strno='$strno';");
        while($row = mysql_fetch_assoc($query))
        {
            $jsonoutput='{"json":{
                "image":"'.$row['image'].'",
"artist":"'.$row['artist'].'",
"name":"'.$row['name'].'"
                }}';
        }
    }
    echo trim($jsonoutput);
    mysql_close($connect) or die ('Unable to close connection-error!!!');
    }
    ?>

http://example.com/getmsgs/strno=123&time=20130416130256&key=....

key = md5('20130416130256' + 'secret_string');

$strno = $_GET['strno'];
$stime = $_GET['time'];
$secret = 'secret_string';
$skey = $_GET['key'];
if( md5($stime . $secret) != $skey ) {
    die('Bad key');
}
$nCurTime = (int) gmdate('YmdHis');
if( ($stime > $nCurTime) || ($stime < ($nCurTime - 20) ) ) {
    die('Bad time');
}
// your code here ...

public static final String md5(final String s) {
try {
    // Create MD5 Hash
    MessageDigest digest = java.security.MessageDigest
            .getInstance("MD5");
    digest.update(s.getBytes());
    byte messageDigest[] = digest.digest();
    // Create Hex String
    StringBuffer hexString = new StringBuffer();
    for (int i = 0; i < messageDigest.length; i++) {
        String h = Integer.toHexString(0xFF & messageDigest[i]);
        while (h.length() < 2)
            h = "0" + h;
        hexString.append(h);
    }
    return hexString.toString();
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
}
return "";
}