JDK8升级到JDK17 sun.font.FontDesignMetrics类无效替代方案

问题：
项目从jdk1.8切成jdk17后
FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
报错： cannot access class sun.font.FontDesignMetrics (in module java.desktop) because module java.desktop does not export sun.font

搜索资料，最多的解决方案是参考

https://stackoverflow.com/questions/61771048/maven-run-and-build-with-add-exports

https://blog.csdn.net/u012448758/article/details/125689992

在pom文件中添加配置，详细可查看上述博客方法。但是这种方法我试了本地运行时不时就会报错，而且线上也是。原因未找到。

最后多方查找找到了可以替换FontDesignMetrics类来计算文本高度的方法。

FontRenderContext frc = new FontRenderContext(new AffineTransform(), true, true);
Font font = new Font("微软雅黑", Font.ITALIC, 28);
String wordContent = "你好啊！我的Friend";
Rectangle rec = font.getStringBounds(wordContent, frc).getBounds();
int height = rec.height;//计算高
int width =  rec.width; //计算文字宽度

下面是在绘制图片文字的完整示例

public static void createWordPicture2(String wordContent,File watermarkUrl) throws IOException {
        Font font = new Font("微软雅黑", Font.ITALIC, 28);
        //FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
        FontRenderContext frc = new FontRenderContext(new AffineTransform(), true, true);
        //int width = getWordWidth(font, wordContent);//计算宽
        Rectangle rec = font.getStringBounds(wordContent, frc).getBounds();
        int height = rec.height;//计算高
        int width =  rec.width; //计算文字宽度
        BufferedImage bufferedImage = ImageIO.read(watermarkUrl);
        Graphics2D graphics = (Graphics2D)bufferedImage.getGraphics();
        graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        //设置背影颜色
        graphics.setColor(Color.red);
        GradientPaint paint = new GradientPaint(0, 0, Color.PINK, (width+100)/2,0, Color.RED, true);
        graphics.setPaint(paint);// 设置渐变
        graphics.fillRect(0, 0, width+100, height);
        graphics.setFont(font);
        graphics.setColor(Color.WHITE);
        graphics.drawString(wordContent, 50+100,- rec.y );//图片上写文字
        graphics.dispose();
        write(bufferedImage, watermarkUrl.getPath());
    }

public static void write(BufferedImage bufferedImage, String target) throws IOException {
        File file = new File(target);
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        try (OutputStream os = new FileOutputStream(target)) {
            ImageIO.write(bufferedImage, "JPG", os);
        }
    }

原文地址：https://blog.csdn.net/yusewuhen/article/details/140431220

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