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


//Applet that connects to a file on its server to read in
//the first three lines and prints them out to the Java Console
//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 InputStream class associated with your
//	  URLConnection object of step 2 by calling its method getInputStream()


public class myAppletIO extends java.applet.Applet {


URL myURL;

URLConnection myURLConnection;

InputStream myIS;



public void init() {

	String s;
	setBackground(Color.yellow);


	//Step 1&2: Create URL and URLConnection instances
	try{
		myURL = new URL("http://www.mcs.csuhayward.edu/~grewe/CS3520/Mat/AppletIO/data.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 InputStream associated with URLConnection
	try {
		myIS = myURLConnection.getInputStream();		
	}
         catch(IOException e) {System.out.println("Can't access URL input"); }
	
	

	//NOW The rest is much like our examples in class to do
	// File Input
	//Now use myIS to read in contents of file and
	//print out to the Java Console

	//I have decided to use the BufferedReader class because
	//I like its readLine() method.  Hence I need to convert
	//myIS (an Instance of InputStream) to a BufferedReader instance.
	//Step A:  Convert myIS to an instance of InputStreamReader
	//Step B: Convert the instance of InputStreamReader to a 
	//	  BufferedReader instance.

	//STEP A
        InputStreamReader myISR = new InputStreamReader(myIS);

	//STEP B
        BufferedReader BR = new BufferedReader(myISR);



	

	//Perform File Input with BufferedReader instance
        //Read the 3 input lines and write out to Java Console
        for(int i=0; i<3; i++)
        { 
		try {		          
		          s = BR.readLine();
		          System.out.println("Line " + i + ": " + s);
		}catch(IOException e) {System.out.println("can't read line " + i); }
         }


	//Close all streams
        try{
	        BR.close();
	        myISR.close();             
		myIS.close(); 
	} catch(IOException e) {System.out.println("can't close streams"); }
		

}


}