import java.applet.*;
import java.io.*;
import java.net.*;
import java.awt.*;


//Applet that connects to a file on its server to write three
//lines of text into the file.
//Note: Applets can only perform FileIO with files on the
//      server on which the Applet resides.
//Note: To access a file on the server from an Applet you need
//      to do the following steps:
//      1)Create an instance of URL pointing to the url of the file
//      2)Create an instance of URLConnection class by calling the
//              openConnection() method of your URL instance from step 1
//      3)Create an instance of OutputStream class associated with your
//        URLConnection object of step 2 by calling its method getOutputStream()


public class myAppletOutput extends java.applet.Applet {


URL myURL;

URLConnection myURLConnection;

OutputStream myOS;



public void init() {

        String s;
        setBackground(Color.yellow);


        //Step 1&2: Create URL and URLConnection instances
        try{
                myURL = new 
URL("ftp://www.mcs.csuhayward.edu/staff2/grewe/CS3520/Mat/dataOut.dat");//URL("http://www.mcs.csuhayward.edu/~grewe/CS3520/Mat/dataOut.dat");
        }catch(MalformedURLException e) {System.out.println("Can't access URL");
                System.out.println("String: " + e.toString());
                System.out.println("Message: " + e.getMessage()); }

        try{
                myURLConnection = myURL.openConnection();
        }catch(IOException e) {System.out.println("Can't open connection to URL"); }



        //Step 3: Get OutputStream associated with URLConnection
        try {
                myOS = myURLConnection.getOutputStream();                
        }
         catch(IOException e) {System.out.println("Can't access URL outputstream");
		System.out.println("String: " + e.toString());
		System.out.println("Message: " + e.getMessage()); }
        
        

        //NOW The rest is much like our examples in class to do
        // File Input
        //Now use myOS to write out 3 lines of text to the file.

        //I have decided to use the BufferedWriter class because
        //I like its write() and newLine() methods.  Hence I need to convert
        //myOS (an Instance of OutputStream) to a BufferedWriter instance.
        //Step A:  Convert myOS to an instance of OutputStreamWriter
        //Step B: Convert the instance of OutputStreamWriter to a 
        //        BufferedWriter instance.

        //STEP A
        OutputStreamWriter myOSW = new OutputStreamWriter(myOS);

        //STEP B
        BufferedWriter BW = new BufferedWriter(myOSW);



        

        //Perform File Output with BufferedWriter instance
        //Write out 3 aribitrary lines to file
	 try {   
		s = "Hello class";
		BW.write(s, 0, s.length());
		BW.newLine();
		s = "This is the 2nd line";
		BW.write(s, 0, s.length());
		s = "Goodbye...the last (3rd) line";
		BW.write(s, 0, s.length());
		BW.newLine();
	 }catch(IOException e) {System.out.println("can't write to file"); }

        

        //Close all streams
        try{
                BW.close();
                myOSW.close();             
                myOS.close(); 
        } catch(IOException e) {System.out.println("can't close streams"); 
		System.out.println("String: " + e.toString());
		System.out.println("Message: " + e.getMessage()); }
                

}


}