php - Android 没有收到来自 PHP 服务器的响应

Question

出于调试目的，我的 PHP 服务器向我的 Android 客户端回显了一个非常简单的字符串:

<?php echo "I REALLY LIKE PIE" ?>

我的 Android 客户端有以下代码来接收这样的字符串:

URL url = new URL("http://192.168.0.107/index.php");
        urlConnection = (HttpURLConnection) url.openConnection();


        urlConnection.setReadTimeout(10000);
        urlConnection.setConnectTimeout(15000);
        urlConnection.setRequestMethod("POST");
        urlConnection.setDoOutput(true);
        urlConnection.setDoInput(true);
        urlConnection.connect();

        int HTTPResult = urlConnection.getResponseCode();
        if (HTTPResult == HttpURLConnection.HTTP_OK) {
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            String output = "";
            while ((output = bufferedReader.readLine()) != null) {
                returnedString.append(output);
            }
            bufferedReader.close();

        }

        urlConnection.disconnect();

然而，变量“output”为空，因此返回的字符串也为空。为什么我没有收到回复？

Answer 1

1. 添加用于调试目的的日志或使用带断点的 android 调试器。
2. 确保您已对 php 配置文件进行必要的更改，以便通过您的手机访问它。它应该工作。如果问题仍然存在，请告诉我。 (我一直在使用这段代码进行一些小的改动，以便之后解析 JSON 对象，但由于在你的情况下它只是一个字符串，所以它应该可以工作。

3. 为了更好、更简单和优化，使用 OkHttp 或 Volley

   URL url = new URL("http://192.168.0.107/index.php");
   urlConnection = (HttpURLConnection) url.openConnection();
   BufferedReader reader = null;
   
   urlConnection.setReadTimeout(10000);
   urlConnection.setConnectTimeout(15000);
   urlConnection.setRequestMethod("POST");
   urlConnection.setDoOutput(true);
   urlConnection.setDoInput(true);
   urlConnection.setRequestMethod("GET");
   urlConnection.connect();
   
   // Read the input stream into a String
   InputStream inputStream = urlConnection.getInputStream();
   StringBuffer buffer = new StringBuffer();
   if (inputStream == null) {
   
   // Nothing to do.
   
   }
   reader = new BufferedReader(new InputStreamReader(inputStream));
   
   String line;
   while ((line = reader.readLine()) != null) {
    // Since it's JSON, adding a newline isn't necessary (it won't affect        parsing)
    // But it does make debugging a *lot* easier if you print out the completed
    // buffer for debugging.
    buffer.append(line + "\n");
   }
   
   
   bufferedReader.close();
   
   }
   
   urlConnection.disconnect();