java - java中将字符串写入图像

Question

我正在尝试使用ImageIo将字符串写入图像。但是，在写入大字符串时，完整的字符串不会写入该图像中。

这是我的代码:

File url=new File(imgUrl);

BufferedImage image = ImageIO.read(url);

Graphics g = image.getGraphics();
g.setPaintMode();
g.setFont(g.getFont().deriveFont(30f));
g.drawString(text, 100, 100);
g.dispose();

此代码适用于小字符串。但是当字符串的宽度超过图像的宽度时，则该图像上不会显示完整的字符串。

有什么建议吗？

Answer 1

我有一个老方法试试

public BufferedImage stringToImage(String text, Font font, Color bgColor, Color fgColor) {
    BufferedImage image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2d = (Graphics2D) image.getGraphics();
    g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    FontRenderContext fc = g2d.getFontRenderContext();
    Rectangle2D bounds = font.getStringBounds(text, fc);

    //calculate the size of the text
    int width = (int) bounds.getWidth();
    int height = (int) bounds.getHeight();

    image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    g2d = (Graphics2D) image.getGraphics();
    g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setFont(font);

    g2d.setColor(bgColor);
    g2d.fillRect(0, 0, width, height);
    g2d.setColor(fgColor);
    g2d.drawString(text, 0, (int)-bounds.getY());
    g2d.dispose();

    return image;
}

并使用

BufferedImage image = stringToImage(text, font, bgColor, fgColor);
ImageIO.write(image, "jpg", file);