Researched by Ed Ort
Release 1.0
August 2001
Question
I am developing a project in J2ME (for MIDP 1.0 compliant devices) and I would like to create a program that emulates an HTML form.
For example, suppose I have the following form:
<FORM NAME="Example" METHOD="POST" ACTION="http://www.test.it">
<INPUT TYPE="TEXT" NAME="TextField">
<INPUT TYPE="TEXT" NAME="TextField2">
<INPUT TYPE="SUBMIT" NAME="Submit">
</FORM>
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I would like to write a simple Java program that produces a form like the one
above, but with the values "Hello" and "Hello2" instead of
"TextField" and "TextField2." I tried to do this by coding the following:
import java.net.*;
import java.io.*;
...
try
{
URL conn=new URL("http://www.test.it");
URLConnection ConnAp=conn.openConnection();
ConnAp.setDoOutput(true);
PrintWriter out=new PrintWriter(ConnAp.getOutputStream());
out.println("TextField=Hello;TextField2=Hello2");
out.flush();
out.close();
} catch(Exception ex)
{ System.out.println(ex.toString());}
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But that didn't work. How can I do it?
Tip
What you code depends on whether you expect data returned in the response. If you expect no data in the response, try this:
HttpConnection conn =
("http://www.test.it" + "?TextField=Hello&TextField2=Hello2&Submit=Submit");
conn.close();
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Note however that this simple request doesn't handle all the internationalization capabilities of a MIME-type POST request.
If you do expect data returned, you need to code something more sophisticated.
For example, the following code handles a "full-blown" POST request, that is, one that includes MIME-type and urlencoded FORM data:
HttpConnection conn = (HttpConnection)
Connector.open("http://www.test.it");
byte [] data = "TextField=Hello&TextField2=Hello2&Submit=Submit".getBytes ();
conn.setMethod (HttpConnection.POST);
conn.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0");
conn.setRequestProperty("Content-Language", "en-US");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream os = conn.openOutputStream ();
os.write (data);
os.close ();
conn.close ();
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You can find the HttpConnection interface in the
javax.microedition.io package in MIDP.
Acknowledgments
Many thanks to Gary Adams for the solution to this question.
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