JAVA Swing 設置字體屬性，模仿word

運行效果

代碼

import javax.swing.*;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.HashMap;
import java.util.Map;

public class demo2 extends JFrame {
    JTextPane text = new JTextPane();

    DefaultStyledDocument doc = (DefaultStyledDocument)text.getDocument(); //從文字面板建立默認樣式化文檔
    SimpleAttributeSet set = new SimpleAttributeSet(); //建立一個樣式屬性集合

    JComboBox fonts,sizes,colors;
    JButton ensure,cancel;
    String[] font ={"宋體","黑體","楷體","仿宋"};
    String[] size ={"10號","12號","14號","16號"};
    String[] color = {"黑色","紅色","綠色","藍色"};

    int start=0;
    int end=0;

    public demo2(){
        super();
        this.setLayout(new GridLayout(1,2)); //網格布局，一行二列
        text.setText("這是一行文本，你可以使用右邊的選項來改變s字體的樣式");
        text.setFont(new Font(font[0],Font.PLAIN,10));//設置默認為宋體10號
        this.add(text);



        JPanel panel = new JPanel(new GridLayout(5,2));
        panel.add(new JLabel("字體設置"));
        panel.add(new JLabel());
        panel.add(new JLabel("字體："));
        panel.add(fonts=new JComboBox(font));
        panel.add(new JLabel("字號："));
        panel.add(sizes=new JComboBox(size));
        panel.add(new JLabel("顏色："));
        panel.add(colors=new JComboBox(color));
        panel.add(ensure=new JButton("確定"));
        panel.add(cancel=new JButton("取消"));
        this.add(panel);
        //添加監聽
        Action action = new Action();
        fonts.addActionListener(action);
        sizes.addActionListener(action);
        colors.addActionListener(action);
        ensure.addActionListener(action);
        cancel.addActionListener(action);
        //文本面板添加鼠標監聽，用於獲取選中的文字
        Mouse mouse = new Mouse();
        text.addMouseListener(mouse);

        this.setSize(350,150);
        this.setVisible(true);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    class Action implements ActionListener{
        //建立映射
        int[] sizeen = {10,12,14,16};
        Color[] coloren = {Color.BLACK,Color.RED,Color.GREEN,Color.BLUE};
        Map<String,Integer> sizeMap = new HashMap<>();
        Map<String,Color> colorMap = new HashMap<>();



        @Override
        public void actionPerformed(ActionEvent e) {
            for (int i = 0; i < 4; i++) {
                sizeMap.put(size[i],sizeen[i]);
                colorMap.put(color[i],coloren[i]);
            }
            Object source = e.getSource();
            String f = (String)fonts.getSelectedItem();
            String s = (String)sizes.getSelectedItem();
            String c = (String)colors.getSelectedItem();

            set.addAttribute(StyleConstants.FontFamily,f); //設置選擇的字體
            set.addAttribute(StyleConstants.Size,sizeMap.get(s)); //設置選擇的字號
            set.addAttribute(StyleConstants.Foreground,colorMap.get(c)); //設置選擇的顏色
            //點擊確定按鈕
            if (source.equals(ensure)){
                doc.setCharacterAttributes(0,text.getText().length(),set,false); //所有文本更改為所選樣式
            }else if (source.equals(cancel)){ //點擊取消按鈕
                //樣式回歸默認
                set.addAttribute(StyleConstants.FontFamily,font[0]);
                set.addAttribute(StyleConstants.FontSize,sizeen[0]);
                set.addAttribute(StyleConstants.Foreground,coloren[0]);
                doc.setCharacterAttributes(0,text.getText().length(),set,false); //所有文本改為默認樣式
                //列表框選項歸位
                fonts.setSelectedItem(font[0]);
                sizes.setSelectedItem(size[0]);
                colors.setSelectedItem(color[0]);
            }else if (source.equals(fonts)|source.equals(sizes)|source.equals(colors)){ //如果選擇了文本，更改列表框選項時會即時修改樣式
                doc.setCharacterAttributes(start,end,set,false); //即時修改選擇的文本為指定樣式
            }
        }

    }

    class Mouse implements MouseListener{
        @Override
        public void mouseClicked(MouseEvent e) {

        }

        @Override
        public void mousePressed(MouseEvent e) {

        }

        @Override
        public void mouseReleased(MouseEvent e) {
            //獲取選擇的文本的開始坐標和長度
            start=text.getSelectionStart();
            end=text.getSelectionEnd()-start;
        }

        @Override
        public void mouseEntered(MouseEvent e) {

        }

        @Override
        public void mouseExited(MouseEvent e) {

        }
    }

    public static void main(String[] args) {
        new demo2();
    }
}