1 Java随机生成中文汉字 2     /** 3      * 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。 4      * 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！！ 5      *  6      */ 7     @Test 8     public void create() throws Exception { 9         String str = null;10         int hightPos, lowPos; // 定义高低位11         Random random = new Random();12         hightPos = (176 + Math.abs(random.nextInt(39)));//获取高位值13         lowPos = (161 + Math.abs(random.nextInt(93)));//获取低位值14         byte[] b = new byte[2];15         b[0] = (new Integer(hightPos).byteValue());16         b[1] = (new Integer(lowPos).byteValue());17         str = new String(b, "GBk");//转成中文18         System.err.println(str);19     }20 21     /**22      * 旋转和缩放文字23      * 必须要使用Graphics2d类24      */25     public void trans(HttpServletRequest req, HttpServletResponse resp) throws Exception{26         int width=88;27         int height=22;28         BufferedImage img = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);29         Graphics g = img.getGraphics();30         Graphics2D g2d = (Graphics2D) g;31         g2d.setFont(new Font("黑体",Font.BOLD,17));32         Random r = new Random();33         for(int i=0;i<4;i++){34             String str = ""+r.nextInt(10);35             AffineTransform aff = new AffineTransform();36             aff.rotate(Math.random(),i*18,height-5);37             aff.scale(0.6+Math.random(), 0.6+Math.random());38             g2d.setTransform(aff);39             g2d.drawString(str,i*18,height-5);40             System.err.println(">:"+str);41         }42         g2d.dispose();43         ImageIO.write(img, "JPEG",resp.getOutputStream());44     }