/**
     * 获取数组中的任意一个随机元素<br>
     * 
     * @return 获取的随机数组元素<br>
     */
    private String getRandom() {
        String random ="";
        String[] strs = { "101", "102", "103", "104", "105" };
        //产生0-(strs.length-1)的整数值,也是数组的索引
        int index=(int) (Math.random()*strs.length);
        random = strs[index];
        return random;
    }