java - Android HttpURLConnection POST 不工作。

Question

我正在尝试检查数据库中是否存在数字，但无法将数据从 android 转发到 php。数据应该是 String、JSON 还是 HashMap？如何发送？

Java

try {

            URL url = new URL("http://192.168.0.106/cei/tourist_home_activities.php");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setReadTimeout(15*1000);
            conn.setConnectTimeout(15*1000);
            conn.setRequestProperty( "Content-Type", "application/json" );
            conn.setRequestProperty("Accept", "application/json");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.connect();

            OutputStream os = conn.getOutputStream();

            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(os,"UTF-8"));

            bufferedWriter.write(*Here is where I assume I input data*);
            bufferedWriter.flush();
            bufferedWriter.close();
            os.close();

            InputStream inputStream = conn.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
            String line = "";

            while ((line = bufferedReader.readLine())!=null)
            {
                response+= line;
            }
            bufferedReader.close();
            inputStream.close();
            conn.disconnect();

        } catch (IOException e) {
            e.printStackTrace();
        }

PHP

<?php

$servername = "127.0.0.1";
$username = "root";
$password = "";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
} 

mysqli_select_db($conn,"discover_ilhabela");

$PIN=$_POST['pin'];

$result = mysqli_query($conn, "SELECT Name FROM `monitors` WHERE     `PIN`='$PIN'");

/*  if (mysql_num_rows($result)==1)
{
 print("1"); 
}
else
{
 print("0");
} */

 print($PIN);

 ?>

我试图检查是否有任何结果来确认数据库中存在该数字，但首先我只是试图返回字符串，但它返回的是空字符串。

Answer 1

您的 PHP 端点需要 $_POST['pin']，因此您应该以纯文本形式发送。引用这个:How to add parameters to HttpURLConnection using POST