Solved

input / output problem

Posted on 2004-04-07
3
334 Views
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
  • 2
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

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question