TextPane RTF – JavaCrypto

Da die JTextPane-Komponente in ihrer Standard-Einstellung nur mit Textdateien arbeitet und keine Formatierungen bietet, ist für einen Texteditor ein anderer „Content Type“ nötig, nämlich entweder „HTML“ oder „RTF“.

Im Netz findet Ihr viele Beispiele für die Nutzung der JTextPane-Komponente als einfacher Webbrowser, aber sobald Ihr Beispiele für das Laden und Speichern einer RTF-Datei in/aus einem JTextPane sucht wird es einsam in der Such-Ergebnismaske.

Das nachfolgende Programm wird für alle nachfolgenden Beispiele die Basis bilden. Beachtet bitte, das Ihr das Projekt nur in intelliJ IDEA nachbilden könnt, da die Datei TextPane.form nur von intelliJ IDEA verarbeitet werden kann. Nach dem Start in intelliJ IDEA erhaltet Ihr diese Oberfläche (eine Demo-RTF-Datei erhaltet Ihr über diesen Link: textpane_rtf.rtf:

Hier ist Quellcode des Programms:

/*
 * Herkunft/Origin: http://java-crypto.bplaced.net/
 * Programmierer/Programmer: Michael Fehr
 * Copyright/Copyright: frei verwendbares Programm (Public Domain)
 * Copyright: This is free and unencumbered software released into the public domain.
 * Lizenttext/Licence: <http://unlicense.org>
 * getestet mit/tested with: Java Runtime Environment 11.0.5 x64
 * verwendete IDE/used IDE: intelliJ IDEA 2019.3.1
 * Datum/Date (dd.mm.jjjj): 30.12.2019
 * Funktion: TextPane RTF = laden und speichern einer RTF-Datei
 * Function: TextPane RTF = load and save of a rtf-file
 *
 * Hinweis/Notice
 * Sie benoetigen intelliJ um das Programm uebersetzen und ausfuehren zu koennen
 * You need intelliJ to build and run the program
 */

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
import javax.swing.text.rtf.RTFEditorKit;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;

public class TextPane {
    private JPanel panelMain;
    private JPanel panelButtons;
    private JButton buttonLoad;
    private JScrollPane scrollPane;
    private JTextPane textPane;
    private JButton buttonSave;

    public TextPane() {

        textPane.setContentType("text/rtf");
        textPane.setEditorKit(new RTFEditorKit());

        buttonLoad.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                loadRtf("textpane_rtf.rtf");
            }
        });
        buttonSave.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                saveRtf("textpane_rtf.rtf");
            }
        });

    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setContentPane(new TextPane().panelMain);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setTitle("TextPane RTF");
        frame.setSize(500, 300);
        frame.setVisible(true);
    }

    public void loadRtf(String filename)  {
        RTFEditorKit RTF_KIT = new RTFEditorKit();
        textPane.setContentType("text/rtf");
        InputStream inputStream;
        try {
            inputStream = new FileInputStream(filename);
            final DefaultStyledDocument styledDocument = new DefaultStyledDocument(new StyleContext());
            RTF_KIT.read(inputStream, styledDocument, 0);
            textPane.setDocument(styledDocument);
            // delete added last line
            String content = textPane.getDocument().getText(0, textPane.getDocument().getLength());
            int lastLineBreak = content.lastIndexOf('\n');
            textPane.getDocument().remove(lastLineBreak, textPane.getDocument().getLength() - lastLineBreak);
        } catch (IOException | BadLocationException e) {
            e.printStackTrace();
        }
        textPane.requestFocus();
    }

    public void saveRtf(String filename){
        try {
            FileOutputStream fos = new FileOutputStream(filename);
            RTFEditorKit kit = (RTFEditorKit) textPane.getEditorKit();
            StyledDocument doc = textPane.getStyledDocument();
            int len = doc.getLength();
            kit.write(fos, doc, 0, len);
            fos.close();
        } catch (IOException | BadLocationException e) {
            e.printStackTrace();
        }
        textPane.requestFocus();
    }

}

100

* Herkunft/Origin: http://java-crypto.bplaced.net/

* Programmierer/Programmer: Michael Fehr

* Copyright/Copyright: frei verwendbares Programm (Public Domain)

* Copyright: This is free and unencumbered software released into the public domain.

* Lizenttext/Licence: <http://unlicense.org>

* getestet mit/tested with: Java Runtime Environment 11.0.5 x64

* verwendete IDE/used IDE: intelliJ IDEA 2019.3.1

* Datum/Date (dd.mm.jjjj): 30.12.2019

* Funktion: TextPane RTF = laden und speichern einer RTF-Datei

* Function: TextPane RTF = load and save of a rtf-file

* Hinweis/Notice

* Sie benoetigen intelliJ um das Programm uebersetzen und ausfuehren zu koennen

* You need intelliJ to build and run the program

import javax.swing.*;

import javax.swing.text.BadLocationException;

import javax.swing.text.DefaultStyledDocument;

import javax.swing.text.StyleContext;

import javax.swing.text.StyledDocument;

import javax.swing.text.rtf.RTFEditorKit;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.*;

public class TextPane {

private JPanel panelMain;

private JPanel panelButtons;

private JButton buttonLoad;

private JScrollPane scrollPane;

private JTextPane textPane;

private JButton buttonSave;

public TextPane() {

textPane.setContentType("text/rtf");

textPane.setEditorKit(new RTFEditorKit());

buttonLoad.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

loadRtf("textpane_rtf.rtf");

}

});

buttonSave.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

saveRtf("textpane_rtf.rtf");

}

});

}

public static void main(String[] args) {

JFrame frame = new JFrame();

frame.setContentPane(new TextPane().panelMain);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.pack();

frame.setTitle("TextPane RTF");

frame.setSize(500, 300);

frame.setVisible(true);

}

public void loadRtf(String filename) {

RTFEditorKit RTF_KIT = new RTFEditorKit();

textPane.setContentType("text/rtf");

InputStream inputStream;

try {

inputStream = new FileInputStream(filename);

final DefaultStyledDocument styledDocument = new DefaultStyledDocument(new StyleContext());

RTF_KIT.read(inputStream, styledDocument, 0);

textPane.setDocument(styledDocument);

// delete added last line

String content = textPane.getDocument().getText(0, textPane.getDocument().getLength());

int lastLineBreak = content.lastIndexOf('\n');

textPane.getDocument().remove(lastLineBreak, textPane.getDocument().getLength() - lastLineBreak);

} catch (IOException | BadLocationException e) {

e.printStackTrace();

}

textPane.requestFocus();

}

public void saveRtf(String filename){

try {

FileOutputStream fos = new FileOutputStream(filename);

RTFEditorKit kit = (RTFEditorKit) textPane.getEditorKit();

StyledDocument doc = textPane.getStyledDocument();

int len = doc.getLength();

kit.write(fos, doc, 0, len);

fos.close();

} catch (IOException | BadLocationException e) {

e.printStackTrace();

}

textPane.requestFocus();

}

Der XML-Code der Form:

  <?xml version="1.0" encoding="UTF-8" ?> 
- <form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="TextPane">
- <grid id="27dc6" binding="panelMain" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
  <margin top="10" left="10" bottom="10" right="10" /> 
- <constraints>
  <xy x="20" y="20" width="500" height="400" /> 
  </constraints>
  <properties /> 
  <border type="none" /> 
- <children>
- <grid id="69623" binding="panelButtons" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
  <margin top="0" left="0" bottom="0" right="0" /> 
- <constraints>
  <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false" /> 
  </constraints>
  <properties /> 
  <border type="none" /> 
- <children>
- <component id="b1559" class="javax.swing.JButton" binding="buttonLoad">
- <constraints>
  <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false" /> 
  </constraints>
- <properties>
  <text value="load" /> 
  </properties>
  </component>
- <component id="1e556" class="javax.swing.JButton" binding="buttonSave">
- <constraints>
  <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false" /> 
  </constraints>
- <properties>
  <text value="save" /> 
  </properties>
  </component>
  </children>
  </grid>
- <scrollpane id="5bf0e" binding="scrollPane">
- <constraints>
  <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="7" hsize-policy="7" anchor="0" fill="3" indent="0" use-parent-layout="false" /> 
  </constraints>
  <properties /> 
  <border type="none" /> 
- <children>
- <component id="100bc" class="javax.swing.JTextPane" binding="textPane">
  <constraints /> 
  <properties /> 
  </component>
  </children>
  </scrollpane>
  </children>
  </grid>
  </form>

<?xml version="1.0" encoding="UTF-8" ?>

- <form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="TextPane">

- <grid id="27dc6" binding="panelMain" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">

- <constraints>

</constraints>

- <children>

- <grid id="69623" binding="panelButtons" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">

- <constraints>

</constraints>

- <children>

- <component id="b1559" class="javax.swing.JButton" binding="buttonLoad">

- <constraints>

</constraints>

- <properties>

</properties>

</component>

- <component id="1e556" class="javax.swing.JButton" binding="buttonSave">

- <constraints>

</constraints>

- <properties>

</properties>

</component>

</children>

</grid>

- <scrollpane id="5bf0e" binding="scrollPane">

- <constraints>

</constraints>

- <children>

- <component id="100bc" class="javax.swing.JTextPane" binding="textPane">

</component>

</children>

</scrollpane>

</children>

</grid>

</form>

Alle Quellcodes zur JTextPane findet Ihr zum Download in meinem Github-Repository, welches Ihr über diesen Link erreicht: https://github.com/java-crypto/JTextPane. Alle Programme sind unter Java 11 lauffähig (vermutlich auch unter Java 8) und wurden mit intelliJ IDEA entwickelt, welches für das eigene „Spielen“ notwendig ist.

Die Lizenz zum obigen Beispiel findet Ihr auf der eigenen Lizenz-Seite.

Letzte Bearbeitung: 30.12.2019