Solved

input / output problem

Posted on 2004-04-07
3
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Last Modified: 2010-05-18
Need help displaying (when programme starts) the two txt files into myTxtBox.  

User then selects file name from myTxtBox - can't get this to work either.

Need help creating the button which - when pressed - loads the selected txt file into myBox.  

Thanks

Code so far:-

//<applet code=Lou.class width=400 height=200></applet>
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.awt.event.*;

 
public class Lou extends Applet implements ActionListener{

Label myLabel;
TextArea myBox;
TextField myTxtbox; //Added new textbox onto applet into which file name can be typed for 23a.
Button mybtn;


public void init() {

      try {
        
         myLabel= new Label("The text area shows the information read from the file on the server");
         myBox = new TextArea("", 4,20);
         myTxtbox = new TextField(20);
          mybtn = new Button ("Load File into Text Area");
         add(myLabel);
          add(myBox);
         add(myTxtbox);
         add(mybtn);
         mybtn.addActionListener(this);

       URL myURL = new URL(getDocumentBase(),"readthis.txt");

                   // open file on server
                   URLConnection myConn = myURL.openConnection();  
                   InputStreamReader isr = new InputStreamReader(myConn.getInputStream());
                   BufferedReader bufr = new BufferedReader(isr);

                   String line;
                   line = bufr.readLine(); // read ahead  
                  
                   while (line != null) {
                   myBox.append(line + "\n");
                   line = bufr.readLine();  

                         } // end of while

      } // end of try


      catch (MalformedURLException me) {
         System.out.println("Bad URL encountered" + me );
       }


      catch (IOException ioe){
         System.out.println("IO Exception" + ioe);
      }


      }  // end of init()


public void actionPerformed(ActionEvent e) {



}//end action performed


} // end of Applet

0
Comment
Question by:buglouie
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3 Comments
 
LVL 14

Accepted Solution

by:
Tommy Braas earned 500 total points
ID: 10777880
Try this;

import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.awt.event.*;
public class Lou extends Applet implements ActionListener {
      Label myLabel;
      TextArea myBox;
      TextField myTxtbox; //Added new textbox onto applet into which file name can be typed for 23a.
      Button mybtn;
      public void init() {
            myLabel = new Label(
            "The text area shows the information read from the file on the server");
            myBox = new TextArea("", 4, 20);
            myTxtbox = new TextField(20);
            myTxtbox.setText("readthis.txt");
            mybtn = new Button("Load File into Text Area");
            add(myLabel);
            add(myBox);
            add(myTxtbox);
            add(mybtn);
            mybtn.addActionListener(this);
      } // end of init()
      public void actionPerformed(ActionEvent e) {
            loadFile();
      }//end action performed
      public void loadFile() {
            try {
                  URL myURL = new URL(getDocumentBase(), myTxtbox.getText());
                  // open file on server
                  URLConnection myConn = myURL.openConnection();
                  InputStreamReader isr = new InputStreamReader(myConn
                              .getInputStream());
                  BufferedReader bufr = new BufferedReader(isr);
                  String line;
                  line = bufr.readLine(); // read ahead  
                  while (line != null) {
                        myBox.append(line + "\n");
                        line = bufr.readLine();
                  } // end of while            
            } // end of try
            catch (MalformedURLException me) {
                  System.out.println("Bad URL encountered" + me);
            } catch (IOException ioe) {
                  System.out.println("IO Exception" + ioe);
            }
      }
} // end of Applet
0
 

Author Comment

by:buglouie
ID: 10778043
Absolute Star!
0
 
LVL 14

Expert Comment

by:Tommy Braas
ID: 10778121
:-)
0

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