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How to write to a file using Applet in Java
Problem Description
How to write to a file using Applet?
Solution
Following example demonstrates how to write to a file by making textarea for writing in a browser using TextArea() making Labels & then creating file using File() constructor.
import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.applet.Applet; import java.net.*; public class WriteFile extends Applet { Button write = new Button("WriteToFile"); Label label1 = new Label("Enter the file name:"); TextField text = new TextField(20); Label label2 = new Label("Write your text:"); TextArea area = new TextArea(10,20); public void init() { add(label1); label1.setBackground(Color.lightGray); add(text); add(label2); label2.setBackground(Color.lightGray); add(area); add(write,BorderLayout.CENTER); write.addActionListener(new ActionListener () { public void actionPerformed(ActionEvent e) { new WriteText(); } }); } public class WriteText { WriteText() { try { String str = text.getText(); if(str.equals("")) { JOptionPane.showMessageDialog(null, "Please enter the file name!"); text.requestFocus(); } else { File f = new File(str); if(f.exists()) { BufferedWriter out = new BufferedWriter(new FileWriter(f,true)); if(area.getText().equals("")) { JOptionPane.showMessageDialog (null,"Please enter your text!"); area.requestFocus(); } else { out.write(area.getText()); if(f.canWrite()) { JOptionPane.showMessageDialog(null, "Text is written in "+str); text.setText(""); area.setText(""); text.requestFocus(); } else { JOptionPane.showMessageDialog(null, "Text isn't written in "+str); } out.close(); } } else { JOptionPane.showMessageDialog (null,"File not found!"); text.setText(""); text.requestFocus(); } } } catch(Exception x) { x.printStackTrace(); } } } }
Result
The above code sample will produce the following result in a java enabled web browser.
View in Browser.
java_applets.htm
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