系统异常：getInputStream() has already been called for this request

回答: 这个异常是由于在获取请求的输入流(getInputStream())之后，再次尝试获取输入流导致的。\[1\]通常情况下，当我们需要从请求中获取body参数时，可以使用getReader()方法来获取输入流，并通过读取流中的内容来获取参数。\[2\]\[3\]在你提供的代码中，使用了getReader()方法来获取输入流，并在读取完流中的内容后关闭了输入流。所以，如果在获取输入流之后再次尝试获取输入流，就会抛出"getInputStream() has already been called for this request"异常。为了解决这个问题，你可以检查代码中是否有多次获取输入流的情况，并确保只获取一次输入流即可。
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