Intrapreneur

How to insert text in a text file by using GUI

To insert text in a text file you will need a FileWriter from the java bibliotheca. In this case I use a graphical interface to put text in a document. For button use you´ll need an ActionListener. This ActionListener also run the function FileWriter.

1. 1. Create an GUI

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

public class Eingabe extends Panel{

static Eingabe ein;

static TextField txt;

public Eingabe (){

setLayout (new BorderLayout());

setPreferredSize(new Dimension(200,50));

Panel p1 = new Panel();

p1.setLayout(new FlowLayout(100,20,10));

txt = new TextField();

txt.setPreferredSize(new Dimension(100, 20));

Button b1 = new Button ("OK");

b1.setPreferredSize(new Dimension(50,20));

b1.setForeground(Color.BLUE);

ActionListener ActionListener1 = new ActionListener1 ();

b1.addActionListener(ActionListener1);

p1.add(b1);

p1.add(txt);

add(p1, BorderLayout.CENTER);

}

public static void main (String[]args){

ein = new Eingabe();

JFrame f = new JFrame("Eingabe");

f.add(ein, BorderLayout.SOUTH);

f.pack();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

Now you´ll have your Window:

For saving a text you need an ActionListener and the function FileWriter.

1. 2. Create an ActionListener Class; first for the button action and second for the FileWriter action

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

public class ActionListener1 implements ActionListener{



                       public void actionPerformed(ActionEvent event){

                                               String tx = Eingabe.txt.getText(); //set a parameter for getting the textfield



                                               FileWriter ef;

                                               File f;



                                               f = new File("Eingabe.txt"); //function for FileWriter

                                               try{



                                                                      ef= new FileWriter(f,true);

                                                                      ef.write(tx); //write the text in an document

                                                                      ef.flush();

                                                                      ef.close();

                                               }

                                               catch(IOException e){

                                                                      e.printStackTrace();

                                               }

                       }

}

Now type in a text…

…and press the button…

…it creates a text document…

Intrapreneur

Samstag, 28. Dezember 2013

Java: How to insert text in a text file by using GUI