我创建了一个Android应用程序,用于从网页中读取数据并从HTTP响应中提取数据。我定义了一个异步任务。只要我连接到XAMMP或我的局域网上的实际目标服务器,该应用程序完美无缺,当我在我的局域网上但通过互联网使用WiFi(我为此设置端口转发)连接时,它工作得很好,但是当我在手机上关闭WiFi,以便将互联网连接到目标URL,我从HTTP GET请求得到一个空响应。
由于它适用于快速网络,我认为问题不在于响应的长度 - 但我不是专家,所以不确定......
这是HTTP代码:
nil
这是异步任务:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get reference to the views
etCurrentPower = (EditText) findViewById(R.id.fieldCurrentPower);
public static String GET(String url){
InputStream inputStream = null;
String result = "";
try {
// create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// make GET request to the given URL
HttpResponse httpResponse = httpclient.execute(new HttpGet(url));
// receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
result = "Exception in http request";
}
return result;
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
String result = "";
while((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
我从UI按钮调用Async任务,如下所示:
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Received!", Toast.LENGTH_LONG).show(); // then I do search for a matching pattern and display that in ViewText field in the app.
知道如何解决这个空响应吗?我尝试将结果发布到日志中,但我得到的只是一个空字符串,它确实告诉我我得到了“响应”,但不是为什么它是空的......
干杯, 加埃塔诺。