I need help with sending http get request. Like this:
URL connectURL;
connectURL = new URL(address);
HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection();
// do some setup
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("GET");
// connect and flush the request out
conn.connect();
conn.getOutputStream().flush();
// now fetch the results
String response = getResponse(conn);
et.setText(response);
I searched the web but any method I try, the code fails at 'conn.connect();'. Any clues?
Very hard to tell without the actual error message. Random thought: did you add the internet permission to you manifest?
<uses-permission android:name="android.permission.INTERNET"/>
If you want some demo code then try following:
URL url = new URL("url.com");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
readStream(in);
} finally {
urlConnection.disconnect();
}
and this:
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
writeStream(out);
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
readStream(in);
} finally {
urlConnection.disconnect();
}
Hope this helps.
Related
I want to send a file via a POST HTTP request but can't find how to handle it first...
I would do this with a string parameter:
String html_params = "myparam=myparam";
byte[] outputInBytes = html_params.getBytes("UTF-8");
URL url = new URL("http://www.myurl.com/senddata.asp");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept", "text/html");
OutputStream os = conn.getOutputStream();
os.write(outputInBytes);
os.close();
response = conn.getResponseCode();
However I have no idea of how to transform and send a file as an array of bytes instead of a string...
Thanks for your help
I am using the code below to fetch data from server. When the data is updated on server, I get the old data from this method. When I use the same method in the web browser i get updated data.
Even when I stop the app and start again it reflects old data but when I have cleaned all my tasks using task manager, I get new data.
Is the data being cached on the device as i am making new request each time
String response = null;
InputStream inputStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000);
urlConnection.setConnectTimeout(15000);
if (method == POST) {
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("Accept", "application/json");
urlConnection.setRequestMethod("POST");
OutputStream os = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(params);
writer.flush();
writer.close();
os.close();
} else {
urlConnection.setRequestMethod("GET");
}
int statusCode = urlConnection.getResponseCode();
/* 200 represents HTTP OK */
if (statusCode == HttpURLConnection.HTTP_OK) {
inputStream = new BufferedInputStream(urlConnection.getInputStream());
response = convertInputStreamToString(inputStream);
return response;
}
I searched the web and found that use cache is on by default, so these two line might help
urlConnection.setUseCaches(false);
urlConnection.addRequestProperty("Cache-Control", "no-cache");
Append some random parameter i.e. current timestamp to the URL then it will treat as fresh request.
Change This
URL url = new URL(urlString);
To
URL url = new URL(urlString+new Date().getTime());
How can I get POST request to work with an "https:" url?
In the following example when I set the URL to "https" instead of "http" the HttpURLConnection automatically makes my request a "GET" ?! while when it was a regular http request it was a POST...
URL url = new URL("*https:*//www.google.com");
// URL url = new URL("*http:*//www.google.com");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
//writeStream(out);
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
// readStream(in);
}finally {
urlConnection.disconnect();
}
enter image description here
Use HttpsURLConnection instead of HttpURLConnection
There is a strange problem when trying post some data to site with tilde.
How could I fix that in Android?
For example, this is my site:
http://host-site.com/~username/form.php
Here is my code for that:
url = new URL(hostSiteString);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestProperty("Host", "myHost");
urlConnection.setRequestProperty("User-Agent", "Mozilla/4.0");
urlConnection.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
urlConnection.setRequestProperty("Accept-Language", "en-US;q=0.7,en;q=0.3");
urlConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
urlConnection.setRequestProperty("Connection", "keep-alive");
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
urlConnection.setDoOutput(true);
BufferedOutputStream bos = new BufferedOutputStream(urlConnection.getOutputStream());
bos.write(readyToken.getBytes(), 0, readyToken.length());
bos.flush();
bos.close();
Found solution, I had to decode my url.
String decode = URLDecoder.decode(hostSiteString);
url = new URL(decode);
I have the following code for url connect, which throws an exception but the exception object is empty. how to connect to a url without any exception in android 2.2
HttpURLConnection urlConnection= null;
URL url = null;
try
{
url = new URL(urlString.toString());
urlConnection=(HttpURLConnection)url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.connect();
}
catch(Exception ex)
{//ex is empty here}
I think a get-request does not like when output is enabled. In this case you should
not set:
urlConnection.setDoOutput(true);