How to add smileys in java swing?

Question

我正在用 java swing 开发一个聊天应用程序，我想在其中添加笑脸，任何人都可以帮助我吗？

Answer 1

Here is some simple code that I found a long time ago on the web. I don't really like that is uses a caret listener. You should probably use a DocumentListener or a DocumentFilter. But it will give you an idea of how you can use a custom Icon to represent a smiley.

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class Smiley
    extends JFrame {
    //autoreplacing :) with picture
    JTextPane p = new JTextPane();
    public Smiley() throws Exception {
        p.setEditorKit(new StyledEditorKit());
        getContentPane().add(p, BorderLayout.CENTER);
        SimpleAttributeSet attrs = new SimpleAttributeSet();
        StyleConstants.setIcon(attrs, getImage());
        p.addCaretListener(new CaretListener() {
            public void caretUpdate(CaretEvent e) {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        try {
                            StyledDocument doc = (StyledDocument) p.getDocument();
                            String text = doc.getText(0, p.getDocument().getLength());
                            int index = text.indexOf(":)");
                            int start = 0;
                            while (index > -1) {
                                Element el = doc.getCharacterElement(index);
                                if (StyleConstants.getIcon(el.getAttributes()) == null) {
                                    doc.remove(index, 2);
                                    SimpleAttributeSet attrs = new SimpleAttributeSet();
                                    StyleConstants.setIcon(attrs, getImage());
                                    doc.insertString(index, ":)", attrs);
                                }
                                start = index + 2;
                                index = text.indexOf(":)", start);
                            }
                        }
                        catch (Exception ex) {
                            ex.printStackTrace();
                        }
                    }
                });
            }
        });
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(400, 400);
    }

    public static void main(String[] args) throws Exception {
        Smiley test11 = new Smiley();
        test11.show();
    }

    protected ImageIcon getImage() {
        BufferedImage bi = new BufferedImage(15, 15, BufferedImage.TYPE_INT_ARGB);
        Graphics g = bi.getGraphics();
        g.setColor(Color.red);
        g.drawOval(0, 0, 14, 14);
        g.drawLine(4, 9, 9, 9);
        g.drawOval(4, 4, 1, 1);
        g.drawOval(10, 4, 1, 1);
        return new ImageIcon(bi);
    }
}

Answer 2

Autoreplace smiles text with appropriate images in JEditorPane

To support the autoreplacing we need a JEditorPane with StyledEditorKit (or extension class) to provide images in text. We just add a DocumentListener to process text insert events. After inserting we check whether the changed text contains smiles string - the ":)". If it contains we replace the smile text with an appropriate image.

The example provides only one smile support - the ":)" string but can be easy extended.

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.*;
import java.awt.image.BufferedImage;
import java.awt.*;
 
public class AutoreplaceSmiles extends JEditorPane {
    static ImageIcon SMILE_IMG=createImage();
 
    public static void main(String[] args) {
        JFrame frame = new JFrame("Autoreplace :) with Smiles images example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final AutoreplaceSmiles app = new AutoreplaceSmiles();
        app.setEditorKit(new StyledEditorKit());
        app.initListener();
        JScrollPane scroll = new JScrollPane(app);
        frame.getContentPane().add(scroll);
 
        frame.setSize(400, 200);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
 
    public AutoreplaceSmiles() {
        super();
    }
 
    private void initListener() {
        getDocument().addDocumentListener(new DocumentListener(){
            public void insertUpdate(DocumentEvent event) {
                final DocumentEvent e=event;
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        if (e.getDocument() instanceof StyledDocument) {
                            try {
                                StyledDocument doc=(StyledDocument)e.getDocument();
                                int start= Utilities.getRowStart(AutoreplaceSmiles.this,Math.max(0,e.getOffset()-1));
                                int end=Utilities.getWordStart(AutoreplaceSmiles.this,e.getOffset()+e.getLength());
                                String text=doc.getText(start, end-start);
 
                                int i=text.indexOf(":)");
                                while(i>=0) {
                                    final SimpleAttributeSet attrs=new SimpleAttributeSet(
                                       doc.getCharacterElement(start+i).getAttributes());
                                    if (StyleConstants.getIcon(attrs)==null) {
                                        StyleConstants.setIcon(attrs, SMILE_IMG);
                                        doc.remove(start+i, 2);
                                        doc.insertString(start+i,":)", attrs);
                                    }
                                    i=text.indexOf(":)", i+2);
                                }
                            } catch (BadLocationException e1) {
                                e1.printStackTrace();
                            }
                        }
                    }
                });
            }
            public void removeUpdate(DocumentEvent e) {
            }
            public void changedUpdate(DocumentEvent e) {
            }
        });
    }
 
    static ImageIcon createImage() {
        BufferedImage res=new BufferedImage(17, 17, BufferedImage.TYPE_INT_ARGB);
        Graphics g=res.getGraphics();
        ((Graphics2D)g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g.setColor(Color.yellow);
        g.fillOval(0,0,16,16);
 
        g.setColor(Color.black);
        g.drawOval(0,0,16,16);
 
        g.drawLine(4,5, 6,5);
        g.drawLine(4,6, 6,6);
 
        g.drawLine(11,5, 9,5);
        g.drawLine(11,6, 9,6);
 
        g.drawLine(4,10, 8,12);
        g.drawLine(8,12, 12,10);
        g.dispose();
 
        return new ImageIcon(res);
    }
}

Source: http://java-sl.com/tip_autoreplace_smiles.html

Answer 3

You can copy these Unicode characters and use them: ☺ ☻

In Java strings, these will be "\☺" and "\☻" .

Answer 4

package com.bulletapp.dragontest;

import javax.swing.*;
import java.awt.*;
import java.util.*;

public class Smiley extends JApplet
{
    public static final int FACE_DIAMETER = 200;
    public static final int X_FACE = 100;
    public static final int Y_FACE = 50;

    public static final int EYE_WIDTH = 10;
    public static final int EYE_HEIGHT = 20;
    public static final int X_RIGHT_EYE = 155;
    public static final int Y_RIGHT_EYE = 95;
    public static final int X_LEFT_EYE = 230;
    public static final int Y_LEFT_EYE = Y_RIGHT_EYE;

    public static final int Y_NOSE = 135;

    public static final int MOUTH_WIDTH = 100;
    public static final int MOUTH_HEIGHT = 50;
    public static final int X_MOUTH = 150;
    public static final int Y_MOUTH = 175;
    public static final int MOUTH_DEGREES_SHOWN = 180;

    public int noseDiameter = 10;         // initial value of the nose's diameter
    public int xNose = 195;               // initial value of the nose's x-position
    public int mouthStartAngle = 180;     // initial start angle of the mouth's arc
    public Color eyeColor = Color.BLACK;  // initial eye color

    public void paint(Graphics graphics)
    {
        // Draw face circle:
        graphics.setColor(Color.YELLOW);
        graphics.fillOval(X_FACE, Y_FACE, FACE_DIAMETER, FACE_DIAMETER);
        graphics.setColor(Color.BLACK);
        graphics.drawOval(X_FACE, Y_FACE, FACE_DIAMETER, FACE_DIAMETER);

        // Draw eyes:
        graphics.setColor(eyeColor);
        graphics.fillOval(X_RIGHT_EYE, Y_RIGHT_EYE, EYE_WIDTH, EYE_HEIGHT);
        graphics.fillOval(X_LEFT_EYE, Y_LEFT_EYE, EYE_WIDTH, EYE_HEIGHT);

        // Draw nose:
        graphics.setColor(Color.BLACK);
        graphics.fillOval(xNose, Y_NOSE, noseDiameter, noseDiameter);

        // Draw mouth:
        graphics.setColor(Color.RED);
        graphics.drawArc(X_MOUTH, Y_MOUTH, MOUTH_WIDTH, MOUTH_HEIGHT,
            mouthStartAngle, MOUTH_DEGREES_SHOWN);
    }

    public void modifyFace()
    {
        String inputString;
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Which would you like to change?\nMOUTH, NOSE, or EYES");
        inputString = keyboard.nextLine();

        // your code goes here, you do not have to modify any code before this point

        // you do not have to modify code after this point
    }

    public static void addAppletToFrame(JApplet applet)
    {
        JFrame frame = new JFrame("Smiley!");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(400, 400);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }

    public static void main(String[] args)
    {
        Smiley smiley = new Smiley();
        smiley.modifyFace();

        addAppletToFrame(smiley);
    }
}

Answer 5

import java.awt.*;
public class SmileyFace {

   public static void main(String[] args){


        Frame f = new Frame("Smile Face");
        f.setSize(500, 500);
        f.setVisible(true);

        Graphics g;
        g = f.getGraphics();


        while (true)
        {
            g.setColor(Color.black);
            g.drawOval(100, 100, 100, 100);
            g.setColor(Color.blue);
            g.fillOval(120, 130, 20, 20);
            g.fillOval(160, 130, 20, 20);
            g.setColor(Color.blue);
            g.setColor(Color.red);
            g.drawLine(130, 170, 135, 175);
            g.drawLine(135, 175, 163, 175);
            g.drawLine(163, 175, 168, 170);
            g.setColor(Color.green);
            g.drawString("Hello", 210, 190);



        }


    }
}