生成随机中文

   /**    
                *生成随机的中文组合
         * @param len 需要生成的文字长度
         * @return   
         */
	    public static String getRandomZh(int len) {
	        String ret = "";
	        for (int i = 0; i < len; i++) {
	            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());
	            try {
	                str = new String(b, "GBK"); // 转成中文
	            } catch (UnsupportedEncodingException ex) {
	                ex.printStackTrace();
	            }
	            ret += str;
	        }
	        return ret;
	   }