关于禁止直接访问文件的问题
如下：
后台生成excel文件，放在a/b/test.xls这里，我不希望别人直接输入http://*.com/a/b/test.xls，我希望有权限的人才能访问，无权的则自动跑转，请问该如何处理呢？
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