废话不多说了，直接上代码。

public class demol_NewDrawi {
    public static void main(String[] args) throws Exception {
        int width = 150;
        int height = 30;
        String out = "今夕是何年?";
        double rate = 0.90;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics(); //创霆画笔
        g.setColor(new Color(200, 192, 184));//背景颜色
        g.fill3DRect(0,0, width, height, true);
        g.setColor(Color.BLACK);//文字颜色
        g.setFont(new Font("宋体", Font.BOLD, 20));//设盟宁体

        //居中显示
        int x = (int) (width / 2 - rate * g.getFontMetrics().stringWidth(out) / 2);
        int y = height / 2 + g.getFontMetrics().getHeight() / 3;
        MyDrawString(out, x, y, rate, g);

        ImageIO.write(image, "png", new File("d : / 2.png"));
    }

    public static void MyDrawString(String str, int x, int y, double rate, Graphics g) {
        String tempstr = new String();
        int orgstringwight = g.getFontMetrics().stringWidth(str);
        int orgstringLength = str.length();
        int tempx = x;
        int tempy = y;
        while (str.length() > 0) {
            tempstr = str.substring(0, 1);
            str = str.substring(1, str.length());
            g.drawString(tempstr, tempx, tempy);
            tempx = (int) (tempx + (double) orgstringwight / (double) orgstringLength * rate);
        }
    }
}

1.基准点是baseline

2.ascent：是baseline之上至字符最高处的距离

3.descent：是baseline之下至字符最低处的距离

4.leading：是上一行字符的descent到下一行的ascent之间的距离,也就是相邻行间的空白距离

5.top：是指的是最高字符到baseline的值,即ascent的最大值

6.bottom：是指最低字符到baseline的值,即descent的最大值