从php localhost获取数据

Question

我试图将我的android-login连接到php-localhost以便使用web服务器数据库（mysql），但由于我的代码错误，我无法做到这一点。
你能帮我解决这个问题..谢谢！ Android：

   ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
   nameValuePairs.add(new BasicNameValuePair("username",username));
   nameValuePairs.add(new BasicNameValuePair("password",password));
   HttpClient httpclient = new DefaultHttpClient();
   HttpPost httppost = new HttpPost("http://localhost/folder/jsonlogin.php");  
   httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
   HttpResponse response = httpclient.execute(httppost);
   HttpEntity entity = response.getEntity();
   is = entity.getContent();

jsonlogin.php：

<?php
include('dbconnection.php');
$q=mysql_query("SELECT * FROM accounts WHERE username='".$_REQUEST['username']."' and password='".$_REQUEST['password']."'")or die(mysql_error());
$numrows = mysql_num_rows($q);
if($numrows > 0)
   {
    while($e=mysql_fetch_assoc($q))
        $output[]=$e;

print(json_encode($output));
   }  

错误日志：

Answer 1

HttpPost httppost = new HttpPost("localhost/folder/jsonlogin.php");  

这是罪魁祸首。您未指定协议，必须以http://开头，因此您的URL应如下所示：

HttpPost httppost = new HttpPost("http://localhost/folder/jsonlogin.php");  

但是，如果您在运行Android代码的其他计算机上调用此功能，则必须指定本地IP地址，例如：http://192.168.X.YYY/folder/jsonlogin.php

Answer 2

如果您使用模拟器运行，则应使用 10.0.2.2 而不是 localhost

HttpPost httppost = new HttpPost("http://10.0.2.2/folder/jsonlogin.php");