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()
//NOTE: This Applet will invoke a Perl Server Application program and pass
//	to it the data it wants the Perl script to write to a file.


public class myAppletOutputUsingServer extends java.applet.Applet {


URL myURL;

URLConnection myURLConnection;

OutputStream myOS;
PrintWriter myPW;


String server = "newton.sci.csuhayward.edu";
int port = 200; //port number for ftp protocol ???80
PrintStream out;


public void init() {

        String s;
        setBackground(Color.yellow);


	

	
        //Step 1&2: Create URL and URLConnection instances
        try{
		//URL points to Perl Server Application
		s = "http://newton.sci.csuhayward.edu/~grewe/cgi-bin/WriteFile.cgi";

		
		System.out.flush();
                myURL = new URL(s);

		
		System.out.println("Created URL to " + myURL.toString());

        }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();

		//test to see if can do output
		System.out.println("ULRConnection able to do output? " + myURLConnection.getDoOutput());
		System.out.flush();

		//set so can do output
		myURLConnection.setDoOutput(true);

		//test to see if NOW can do output
		System.out.println("AFTER SET:  ULRConnection able to do output? " + myURLConnection.getDoOutput());
		System.out.flush();

		//print out the URL string this connection attached to
		System.out.println("URL have URLConnection instance to: " + myURLConnection.getURL().toString());
		System.out.flush();
        }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 YOU are going to compose a string containing 3 lines of
	// information you wish to store in the data file that the Perl
	// Server Application accesses.  The format expected by the
	// Perl program is the same format as delivered by a CGI form.
	// Specifically, string1=value1&string2=value2&string3=value3
	
	String time_string = java.util.Calendar.getInstance().getTime().toString();
	s="string1=Lynne Grewe&string2=Your site is great&time=" + time_string;
	


	//Send the above string via a write operation to the output
	//stream associated with the Perl Application
        //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);



        //I have decided to use the PrintWriter class because
        //I like its println() methods.  Hence I need to convert
        //myOS (an Instance of OutputStream) to a PrintWriter instance.
        
	//myPW = new PrintWriter(myOS);


        

        //Perform File Output with BufferedWriter instance
        //Write out 3 aribitrary lines to file

	/* DOESN'T DO ANYTHING 
		myPW.println("hello Class");
		System.out.println("hello Class");
		myPW.println("2nd line");
		myPW.println("3rd line");
		myPW.flush();
		System.out.flush();
	*/

	 try {   
                
                BW.write(s, 0, s.length());
                BW.flush();
		System.out.println("Just wrote: " +s);
		System.out.flush();
         }catch(IOException e) {System.out.println("can't write to file"); }



        

        //Close all streams	
	//	myPW.close();


        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()); }
                

}


}