Invoke Servlet Midlet 2 : Networks « J2ME « Java
Invoke Servlet Midlet 2
/*
Learning Wireless Java
Help for New J2ME Developers
By Qusay Mahmoud
ISBN: 0-596-00243-2
*/
import javax.microedition.rms.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;
public class InvokeServletMidlet2 extends MIDlet implements CommandListener {
Display display = null;
List menu = null;
TextBox input = null;
String user = null;
String url = "http://127.0.0.1:8080/examples/servlet/RequestServlet2";
static final Command backCommand = new Command("Back", Command.BACK, 0);
static final Command submitCommand = new Command("Submit", Command.OK, 2);
static final Command exitCommand = new Command("Exit", Command.STOP, 3);
String currentMenu = null;
public InvokeServletMidlet2() {
}
public void startApp() throws MIDletStateChangeException {
display = Display.getDisplay(this);
menu = new List("Invoke Servlet", Choice.IMPLICIT);
menu.append("Add a user", null);
menu.addCommand(exitCommand);
menu.setCommandListener(this);
mainMenu();
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
void mainMenu() {
display.setCurrent(menu);
}
public void addName() {
input = new TextBox("Enter first name:", "", 5, TextField.ANY);
input.addCommand(submitCommand);
input.addCommand(backCommand);
input.setCommandListener(this);
input.setString("");
display.setCurrent(input);
}
void invokeServlet(String url) throws IOException {
HttpConnection c = null;
InputStream is = null;
OutputStream os = null;
StringBuffer b = new StringBuffer();
TextBox t = null;
try {
c = (HttpConnection)Connector.open(url);
c.setRequestMethod(HttpConnection.POST);
c.setRequestProperty("CONTENT-TYPE","application/x-www-form-urlencoded");
c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Confirguration/CLDC-1.0");
c.setRequestProperty("Content-Language", "en-CA");
os = c.openOutputStream();
String str = "name="+user;
byte postmsg[] = str.getBytes();
System.out.println("Length: "+str.getBytes());
for(int i=0;i<postmsg.length;i++) {
os.write(postmsg[i]);
}
// or you can easily do:
//os.write(("name="+user).getBytes());
os.flush();
is = c.openDataInputStream();
int ch;
while ((ch = is.read()) != -1) {
b.append((char) ch);
System.out.print((char)ch);
}
t = new TextBox("Second Servlet", b.toString(), 1024, 0);
t.addCommand(backCommand);
t.setCommandListener(this);
} finally {
if(is!= null) {
is.close();
}
if(os != null) {
os.close();
}
if(c != null) {
c.close();
}
}
display.setCurrent(t);
}
public void commandAction(Command c, Displayable d) {
String label = c.getLabel();
if (label.equals("Exit")) {
destroyApp(true);
} else if (label.equals("Back")) {
mainMenu();
} else if (label.equals("Submit")) {
user = input.getString();
try {
invokeServlet(url);
}catch(IOException e) {}
} else {
addName();
}
}
}
