Java随机生成中文汉字(使用高位低位转码)

Java随机生成中文汉字
    /**
     * 原理是从汉字区位码找到汉字。在汉字区位码中分高位与底位， 且其中简体又有繁体。位数越前生成的汉字繁体的机率越大。
     * 所以在本例中高位从171取，底位从161取， 去掉大部分的繁体和生僻字。但仍然会有！！
     * 
     */
    @Test
    public void create() throws Exception {
        String str = null;
        int hightPos, lowPos; // 定义高低位
        Random random = new Random();
        hightPos = (176 + Math.abs(random.nextInt(39)));//获取高位值
        lowPos = (161 + Math.abs(random.nextInt(93)));//获取低位值
        byte[] b = new byte[2];
        b[0] = (new Integer(hightPos).byteValue());
        b[1] = (new Integer(lowPos).byteValue());
        str = new String(b, "GBk");//转成中文
        System.err.println(str);
    }

    /**
     * 旋转和缩放文字
     * 必须要使用Graphics2d类
     */
    public void trans(HttpServletRequest req, HttpServletResponse resp) throws Exception{
        int width=88;
        int height=22;
        BufferedImage img = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        Graphics g = img.getGraphics();
        Graphics2D g2d = (Graphics2D) g;
        g2d.setFont(new Font("黑体",Font.BOLD,17));
        Random r = new Random();
        for(int i=0;i<4;i++){
            String str = ""+r.nextInt(10);
            AffineTransform aff = new AffineTransform();
            aff.rotate(Math.random(),i*18,height-5);
            aff.scale(0.6+Math.random(), 0.6+Math.random());
            g2d.setTransform(aff);
            g2d.drawString(str,i*18,height-5);
            System.err.println(">:"+str);
        }
        g2d.dispose();
        ImageIO.write(img, "JPEG",resp.getOutputStream());
    }