Java中怎么实现生成随机位数的随机字符串

    @Test
    public void test24(){
        //假如要获取1-10位的随机数，每一位由a-z或A-Z组成
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        //获得随机位数1-10
        int weishu = (int) Math.round(Math.random()*10+1);
        for(int i=0; i