后台验证及struts2表单验证里field-validator type值的含义？ ... required 是否为空； requiredstring 必须字符； stringlength 输入字符长度限制; ...
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不管采用哪种方法，都同样希望限制输入的长度，因为某些攻击需要大量的字符。
Regardless of which approach you take, you'll also want to limit the length of the entry because some hacks require a large number of characters.
许多网站的文本输入限制似乎为任意长度的字符串。
There are many Web sites that limit text entry to what seems like an arbitrary length.
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