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HOW TO COMMUNICATE JAVA APPLICATION TO SERVLETS

 
Rangini Ramchander
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Posts: 8
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please send a code to communication with javaapplication to servlets r_ramchander@yahoo.com [CODE]
 
Joel Karimpil
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import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;
import java.lang.*;
import java.lang.Thread;

public class Authenticate extends MIDlet implements CommandListener,Runnable {

Display display = null;

TextField txtUserID;
TextField txtPassword;
String strBlank;
Form Form;

String url = "http://localhost/authenticate.jsp";

static final Command cmdLogin = new Command("Login", Command.OK, 2);
static final Command cmdClear = new Command("clear", Command.STOP, 2);

String clientUserID, clientPassword;

public Authenticate(){

display = Display.getDisplay(this);
txtUserID = new TextField("Enter UserID:","",15, TextField.ANY);
txtPassword = new TextField("Enter Password:","",15, TextField.PASSWORD);
form = new Form("Authenticate Urself");
strBlank = new String(" ");
}

public void startApp() throws MIDletStateChangeException{

form.append(txtUserID);
form.append(strBlank);
form.append(txtPassword);
form.addCommand(cmdClear);
form.addCommand(cmdLogin);
form.setCommandListener(this);
display.setCurrent(form);

}

public void pauseApp() {

}

public void destroyApp(boolean unconditional) {

notifyDestroyed();
}

void invokeJSP(String url) throws IOException {

HttpConnection c = null;
InputStream is = null;
OutputStream os = null;
StringBuffer b = new StringBuffer();

TextBox txtDetails = null;

try{

c = (HttpConnection)Connector.open(url);
c.setRequestMethod(HttpConnection.POST);
c.setRequestProperty("IF-Modified-Since", "25 Nov 2001 15:17:19 GMT");
c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Configuration/CLDC-1.0");
c.setRequestProperty("Content-Language", "en-CA");
c.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

os = c.openOutputStream();
os.write(("&UserID=" + clientUserID).getBytes());
os.write(("&Password=" + clientPassword).getBytes());

is = c.openDataInputStream();
int ch;
while ((ch = is.read()) != -1) {

b.append((char) ch);
System.out.print((char)ch);
}
txtDetails = new TextBox("", b.toString(), 1024, 0);
txtDetails.setCommandListener(this);
is.close();
os.close();
c.close();
}
catch(Exception exc){

System.out.println(exc.toString());
}
display.setCurrent(txtDetails);
}

public void commandAction(Command c, Displayable d) {

String label = c.getLabel();
if(label.equals("clear")) {

destroyApp(true);
}
else if (label.equals("Login")) {

System.out.println(url);
Thread t = new Thread(this);
t.start();
System.out.println(url);
}
}

public void run(){

clientUserID = txtUserID.getString();
clientPassword = txtPassword.getString();
clientUserID = Trim(clientUserID);
clientPassword = Trim(clientPassword);
try{

System.out.println(clientUserID + "\t" + clientPassword);
invokeJSP(url);
}
catch(IOException e) {
}
}

String LTrim(String str)
{
String whitespace = new String(" \t\n\r");

String s = new String(str);

if (whitespace.indexOf(s.charAt(0)) != -1) {

int j=0, i = s.length();

while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
j++;

// Get the substring from the first non-whitespace
// character to the end of the string...
s = s.substring(j, i);
}
return s;
}

/*
==================================================================
RTrim(string) : Returns a copy of a string without trailing spaces.
==================================================================
*/
String RTrim(String str)
/*
PURPOSE: Remove trailing blanks from our string.
IN: str - the string we want to RTrim

*/
{
// We don't want to trip JUST spaces, but also tabs,
// line feeds, etc. Add anything else you want to
// "trim" here in Whitespace
String whitespace = new String(" \t\n\r");

String s = new String(str);

if (whitespace.indexOf(s.charAt(s.length()-1)) != -1) {
// We have a string with trailing blank(s)...

int i = s.length() - 1; // Get length of string

// Iterate from the far right of string until we
// don't have any more whitespace...
while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
i--;


// Get the substring from the front of the string to
// where the last non-whitespace character is...
s = s.substring(0, i+1);
}

return s;
}

/*
=============================================================
Trim(string) : Returns a copy of a string without leading or trailing spaces
=============================================================
*/
String Trim(String str)
/*
PURPOSE: Remove trailing and leading blanks from our string.
IN: str - the string we want to Trim

RETVAL: A Trimmed string!
*/
{
return RTrim(LTrim(str));
}


}//end class
 
Joel Karimpil
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sorry...am in a hurry so i'm pasting the whole code.
 
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