空心验证码（定制）

　　　Graphics2D graphics = (Graphics2D) image.getGraphics();
        graphics.setColor(color);
        RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        hints.add(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
        graphics.setRenderingHints(hints);
        FontRenderContext frc = graphics.getFontRenderContext();
        
        char[] wordChars = text.toCharArray();
        int startPosY = 40;
        int startPosX = 60;
        Random random = new Random();
        for (int i = 0; i < wordChars.length; i++) {
            graphics.setFont(fonts[0]);
            char[] charToDraw = new char[] { wordChars[i] };
            GlyphVector fontGV = fonts[0].createGlyphVector(frc, charToDraw);
            Shape textShape = fontGV.getOutline();
            AffineTransform rotate45 = AffineTransform.getRotateInstance(30 * Math.PI, 0, 0);
            Shape rotatedText = rotate45.createTransformedShape(textShape);
            graphics.translate(startPosX, startPosY);
            graphics.draw(rotatedText);
            startPosX = (random.nextInt(3) + 1) * 10;
            startPosY = (random.nextInt(3) + 1);
        }

　　graphics.dispose();

扣空心，只支持一个一个字符的～，多个字符需要循环draw.