Question

I want to build an application to send data from Android client to Java localhost server, then return the replay from server to client, how can i build server? and to send the data pelase?

Answer 1

1. on Android: you have to set the server IP, so if you are working on Emulator you have to use 10.0.2.2, If you want to try it on real device using WIFI then you have to use your PC’s IP.
2. On Android:

URI website;
try {
    HttpClient client = new DefaultHttpClient();
    website = new URI("http://"+ IP+ ":8080/ServerName/ServletName");
    HttpPost request = new HttpPost();
    request.setHeader("Data Name", Data Value);
    request.setURI(website);
    HttpResponse response = client.execute(request);
    // Response From Server
    Header[] headers = response.getAllHeaders();
    for (int i = 0; i < headers.length; i++) {
    Header h = headers[i];
    }
    } catch (URISyntaxException e) {
         e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
   }

1. Building Server : Eclipse File -> New -> Dynamic Web Project.
2. Creating Servlet: on the server, right click on src folder, add you package -> new servlet.
3. On server: in the method doPost

String value = request.getHeader("Data Name");
response.setHeader("Response1", "Value");

note

I show you how to send data using the headers of the response and request, you can use inputstream and outstream for huge data.