httppost返回null

Question

我试图通过我的Android应用程序将数据插入到mysql数据库中。 Httppost每次都不返回null。每当应用程序执行时，httppost都会为null。 它转到异常无效的IP地址。但是在浏览器中搜索时，网址工作正常。任何帮助，将不胜感激。 这是异步任务

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

    nameValuePairs.add(new BasicNameValuePair("id",userid));
    nameValuePairs.add(new BasicNameValuePair("pswd",pswd));

    try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.example.com/work/examplefolder/");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
        Log.e("pass 1", "connection success ");
    }
    catch(Exception e)
    {
        Log.e("Fail 1", e.toString());
        Toast.makeText(getApplicationContext(), "Invalid IP Address",
                Toast.LENGTH_LONG).show();
    }

这是我的PHP代码

$host='127.0.0.1';
$uname='root';
$pwd='';
$db="example";

$con = mysql_connect($host,$uname,$pwd) or die("connection failed");
mysql_select_db($db,$con) or die("db selection failed");

//$id=$_REQUEST['id'];
//$name=$_REQUEST['name'];
$id=$_REQUEST['id'];
$pswd=$_REQUEST['pswd'];
$flag['code']=0;

if($r=mysql_query("insert into user(username,password) values('$id','$pswd')",$con))
{
    $flag['code']=1;

}

print(json_encode($flag));
mysql_close($con);