Question

I’m writing a simple client-server system and the question is: how to structure my client code in order to get POST request-response working in a loop?

At the moment it looks something like this (and it’s is NOT a loop right now):

1. open HttpURLConnection
2. set properties
3. setDoOutput(true)
4. writing to output stream
5. closing output stream
6. new DataInputStream
7. reading response
8. exiting method

I’m not sure which objects do I have to save for the next iterations and which ones I should close.

Answer 1

you need to save the connection object and you should make use of setDoInput(true) for reading data but if you just want to read responseCode and responseMessage you dont need InputStream. check the code below.

HttpURLConnection connection =(HttpURLConnection)new URL("url").openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-type", "text/xml"); // depend on you
connection.setRequestProperty("Accept", "text/xml, application/xml"); // depend on you
connection.setRequestMethod("POST");
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(yaml);
writer.close();
int statusCode = connection.getResponseCode();
String message = connection.getResponseMessage();

for InputStreamReader

connection.setDoInput(true);
InputStreamReader reader =  new InputStreamReader(connection.getInputStream());
char[] cbuf = new char[100];
reader.read(cbuf); 
// there are 3 read method you can choose as per your convenience 
//and put a check for end of line in while loop for reading whole content. 
reader.close();