Java实现聊天发送表情代码

以下是一个简单的Java聊天程序，可以发送表情：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

public class ChatClient extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JEditorPane chatPane;
    private JTextField inputField;
    private JButton sendButton, emojiButton;
    private Map<String, ImageIcon> emojiMap;

    public ChatClient() {
        super("Chat Client");

        chatPane = new JEditorPane();
        chatPane.setEditable(false);
        JScrollPane chatScroll = new JScrollPane(chatPane);
        chatScroll.setPreferredSize(new Dimension(400, 300));

        inputField = new JTextField(30);

        sendButton = new JButton("Send");
        sendButton.addActionListener(this);

        emojiButton = new JButton("Emoji");
        emojiButton.addActionListener(this);

        JPanel inputPanel = new JPanel(new FlowLayout());
        inputPanel.add(inputField);
        inputPanel.add(sendButton);
        inputPanel.add(emojiButton);

        add(chatScroll, BorderLayout.CENTER);
        add(inputPanel, BorderLayout.SOUTH);

        initEmojiMap();

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }

    private void initEmojiMap() {
        emojiMap = new HashMap<String, ImageIcon>();
        String[] emojiNames = {"smile", "cry", "angry", "cool"};
        for (String name : emojiNames) {
            try {
                InputStream is = getClass().getResourceAsStream("/" + name + ".png");
                Image image = ImageIO.read(is);
                ImageIcon icon = new ImageIcon(image);
                emojiMap.put(name, icon);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == sendButton) {
            String text = inputField.getText();
            appendText(text, null);
            inputField.setText("");
        } else if (e.getSource() == emojiButton) {
            showEmojiDialog();
        }
    }

    private void showEmojiDialog() {
        JFrame emojiFrame = new JFrame("Select Emoji");
        emojiFrame.setLayout(new FlowLayout());
        for (Map.Entry<String, ImageIcon> entry : emojiMap.entrySet()) {
            JLabel emojiLabel = new JLabel(entry.getValue());
            emojiLabel.setName(entry.getKey());
            emojiLabel.addMouseListener(new EmojiMouseListener());
            emojiFrame.add(emojiLabel);
        }
        emojiFrame.pack();
        emojiFrame.setVisible(true);
    }

    private void appendText(String text, ImageIcon icon) {
        StyledDocument doc = chatPane.getStyledDocument();
        SimpleAttributeSet attrs = new SimpleAttributeSet();
        StyleConstants.setForeground(attrs, chatPane.getForeground());
        try {
            if (icon != null) {
                doc.insertString(doc.getLength(), " ", attrs);
                chatPane.setCaretPosition(doc.getLength());
                chatPane.insertIcon(icon);
                chatPane.setCaretPosition(doc.getLength());
            }
            doc.insertString(doc.getLength(), text + "\n", attrs);
            chatPane.setCaretPosition(doc.getLength());
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
    }

    private class EmojiMouseListener implements java.awt.event.MouseListener {
        @Override
        public void mouseClicked(java.awt.event.MouseEvent e) {
            JLabel label = (JLabel) e.getSource();
            String name = label.getName();
            ImageIcon icon = emojiMap.get(name);
            appendText(null, icon);
        }
        @Override
        public void mouseEntered(java.awt.event.MouseEvent e) {}
        @Override
        public void mouseExited(java.awt.event.MouseEvent e) {}
        @Override
        public void mousePressed(java.awt.event.MouseEvent e) {}
        @Override
        public void mouseReleased(java.awt.event.MouseEvent e) {}
    }

    public static void main(String[] args) {
        new ChatClient();
    }
}

在本例中，我们将表情图片作为资源文件打包在客户端中。程序中添加了一个Emoji按钮，当用户点击按钮时，弹出表情选择框。表情选择框中使用JLabel显示所有的表情图片，当用户选择表情时，程序会将表情插入到聊天框中。

注意：此代码仅作为示例，实际项目中需要根据需求进行调整和优化。