Hello, the following code uses POST method to communicate with the Web
Server, and the response is displayed in the console (not parsed in a
Servlet, etc). When compiled as a java application, the program works
as expected returning the response as html text.
My aim is to have an Android app that will communicate with servers
using various protocols- and I am using this as an example in learning
how that technique can be done. Therefore I would wish Android to get
the response, and displaying it in 'TextView?' or somewhere. I thought
this was going to be a straight-forward thing, but I have been stuck
at this point for days now.
Can somebody assist if possible.
Thanks. The code follows
package Com;
import java.net.*;
import java.io.*;
public class FormPoster {
private URL url;
private QueryString query = new QueryString();
public FormPoster (URL url){
if (!url.getProtocol().toLowerCase().startsWith("http")){
throw new IllegalArgumentException("Posting only works for http
URLs");
}
this.url = url;
}
public void add(String name, String value){
query.add(name, value);
}
public URL getURL(){
return this.url;
}
public InputStream post() throws IOException {
URLConnection uc = url.openConnection();
uc.setDoOutput(true);
OutputStreamWriter out = new OutputStreamWriter(uc.getOutputStream
(), "ASCII");
out.write(query.toString());
out.write("\r\n");
out.flush();
out.close();
return uc.getInputStream();
}
public static void main(String args[]){
URL url;
if (args.length > 0){
try{
url = new URL(args[0]);
}
catch (MalformedURLException ex){
System.err.println("Usage: java FormPoster url");
return;
}
}
else {
try{
url = new URL("http://www.cnn.com";);
}
catch (IOException ex){
System.err.println(ex);
return;
}
}
FormPoster poster = new FormPoster(url);
poster.add("name","Charles");
poster.add("email", "[email protected]");
try{
InputStream in = poster.post();
InputStreamReader r = new InputStreamReader(in);
int c;
while((c = r.read())!= -1){
System.out.print((char) c);
}
System.out.println();
in.close();
}
catch (IOException ex){
System.err.println(ex);
}
}
}
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