Java字体显示不正确

Question

当我从文件导入字体时，它显示得很奇怪。它应该说“测试”，但它只是说“_”。

这是我的代码：

public void paint(Graphics g2){
Graphics2D g = (Graphics2D)g2;
//<editor-fold defaultstate="collapsed" desc="FontGetter">

Font f = null;
try {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    ge.registerFont((f = Font.createFont(Font.TRUETYPE_FONT, getClass().getResourceAsStream("Triforce.ttf"))));
} catch (IOException e) {
    e.printStackTrace();
}
catch(FontFormatException e)
{
    e.printStackTrace();
}
//</editor-fold>
g.setFont(f.deriveFont(2));
g.drawString("sdfsdfetf", 100, 100);
}

Answer 1

由Font#createFontJava文档指定

... 新字体的点大小为1，样式为普通。。。

（我强调）

这意味着您需要从该实例派生一个新的具有所需属性的实例，例如

try {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    Font f = Font.createFont(Font.TRUETYPE_FONT, getClass().getResourceAsStream("/Triforce.ttf"));
    if (!ge.registerFont(f)) {
        System.out.println("Unable to register font");
    }
    f = f.deriveFont(Font.PLAIN, 24);
    setFont(f);
} catch (IOException e) {
    e.printStackTrace();
} catch (FontFormatException e) {
    e.printStackTrace();
}

您应该在paint方法的上下文之外预加载字体（并应用其属性）。绘画应尽可能快地进行，并将被多次调用，有时会连续快速调用。在任何喷漆方法中加载资源都会浪费时间和资源。。。

例如。。。

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontFormatException;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test1 {

    public static void main(String[] args) {
        new Test1();
    }

    public Test1() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            try {
                GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
                Font f = Font.createFont(Font.TRUETYPE_FONT, getClass().getResourceAsStream("/Triforce.ttf"));
                if (!ge.registerFont(f)) {
                    System.out.println("Unable to register font");
                }
                f = f.deriveFont(Font.PLAIN, 24);
                setFont(f);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (FontFormatException e) {
                e.printStackTrace();
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            FontMetrics fm = g2d.getFontMetrics();
            String text = "Hello world";
            int x = (getWidth() - fm.stringWidth(text)) / 2;
            int y = ((getHeight() - fm.getHeight()) + fm.getAscent()) / 2;
            g2d.drawString(text, x, y);
            g2d.dispose();
        }

    }

}