Question

jsp怎么让一个图片变为圆角的

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Answer 1

使用CSS3定义：
style="border-radius:200px;"
加到图片上就行，根据图片大小调整px的值。

如果是想让jsp作为一个服务，可以生成圆角图片，使用java的Graphics2D类里面的方法，读入图片，然后处理为圆角图片类：
public static BufferedImage makeRoundedCorner(BufferedImage image,
int cornerRadius) {
int w = image.getWidth();
int h = image.getHeight();
BufferedImage output = new BufferedImage(w, h,
BufferedImage.TYPE_INT_ARGB);

Graphics2D g2 = output.createGraphics();

// This is what we want, but it only does hard-clipping, i.e. aliasing
// g2.setClip(new RoundRectangle2D ...)

// so instead fake soft-clipping by first drawing the desired clip shape
// in fully opaque white with antialiasing enabled...
g2.setComposite(AlphaComposite.Src);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.WHITE);
g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius,
cornerRadius));

// ... then compositing the image on top,
// using the white shape from above as alpha source
g2.setComposite(AlphaComposite.SrcAtop);
g2.drawImage(image, 0, 0, null);

g2.dispose();

return output;
}