在Spring中避免重复表单提交的最佳方法是什么？此框架是否提供了任何特殊功能来处理此问题（例如，在同步器令牌中Struts）？
解决方案有两种不同的方法可以避免双重提交，可以合并：
在点击后的几ms内，使用JavaScript来<禁用按钮。这将避免多次提交是由不耐烦的用户在按钮上多次点击引起的。
请求页面时生成唯一标记，并将其放入会话作用域和表单的隐藏字段中。处理期间，检查令牌是否存在，然后立即将其从会话中删除并继续处理。如果令牌不存在，则阻止处理。这可以避免上述类型的问题。
What's the best way of avoiding duplicate form submission in Spring. Does this framework provide any special feature to handle this problem (for example as the Synchronizer Token in Struts)?
解决方案There are different ways to avoid double submits, which can be combined:
Use JavaScript to disable the button a few ms after click. This will avoid multiple submits being caused by impatient users clicking multiple times on the button.
Send a redirect after submit, this is known as Post-Redirect-Get (PRG) pattern. This will avoid multiple submits being caused by users pressing F5 on the result page and ignoring the browser warning that the data will be resend, or navigating back and forth by browser back/forward buttons and ignoring the same warning.
Generate an unique token when the page is requested and put in both the session scope and as hidden field of the form. During processing, check if the token is there and then remove it immediately from the session and continue processing. If the token is not there, then block processing. This will avoid the aforementioned kinds of problems.
In Spring you can use RedirectView as implementation of the PRG pattern (as described in point 2). The other two points needs to be implemented yourself.
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