MIDlet to invoke a CGI script (POST method is used) (2)
/*
Learning Wireless Java
Help for New J2ME Developers
By Qusay Mahmoud
ISBN: 0-596-00243-2
*/
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
/**
* An example MIDlet to invoke a CGI script (POST method is used).
*/
public class InvokeCgiMidlet2 extends MIDlet {
private Display display;
String url = "http://www.javacourses.com/cgi-bin/pgrade.cgi";
public InvokeCgiMidlet2() {
display = Display.getDisplay(this);
}
/**
* Initialization. Invoked when we activate the MIDlet.
*/
public void startApp() {
try {
getGrade(url);
} catch (IOException e) {
System.out.println("IOException " + e);
e.printStackTrace();
}
}
/**
* Pause, discontinue ....
*/
public void pauseApp() {
}
/**
* Destroy must cleanup everything.
*/
public void destroyApp(boolean unconditional) {
}
/**
* Retrieve a grade....
*/
void getGrade(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();
// send input
String str = "name=182016";
byte postmsg[] = str.getBytes();
for(int i=0;i<postmsg.length;i++) {
os.write(postmsg[i]);
}
os.flush();
is = c.openDataInputStream();
int ch;
// receive output
while ((ch = is.read()) != -1) {
b.append((char) ch);
System.out.println((char)ch);
}
t = new TextBox("Final Grades", b.toString(), 1024, 0);
} finally {
if(is!= null) {
is.close();
}
if(os != null) {
os.close();
}
if(c != null) {
c.close();
}
}
display.setCurrent(t);
}
}
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