java javax.servlet.HttpServletRequest.getContentLength() 只返回 int
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javax.servlet.HttpServletRequest.getContentLength() returns int only
提问by Hank
In order to deal with a large request body in a HTTP POST or PUT, relying on HttpServletRequest.getContentLength()is not a good idea, since it returns only integer values, or -1 for request bodies > 2GB.
为了处理 HTTP POST 或 PUT 中的大型请求主体，依赖HttpServletRequest.getContentLength()并不是一个好主意，因为它只返回整数值，或者 -1 表示请求主体 > 2GB。
However, I see no reason, why larger request bodies should not be allowed. RFC 2616 says
但是，我看不出为什么不允许更大的请求主体。RFC 2616 说
Any Content-Length greater than or equal to zero is a valid value.
任何大于或等于零的 Content-Length 都是有效值。
Is it valid to use HttpServletRequest.getHeader('content-length')and parse it to Long instead?
使用HttpServletRequest.getHeader('content-length')并将其解析为 Long是否有效？
采纳答案by Bozho
Yes, this is a fine approach - use getHeader("Content-Length")(capitalized) and Long.parseLong(..). I believe it's what the container is doing, but it is limited to intby the serlvet spec.
是的，这是一个很好的方法 - 使用getHeader("Content-Length")（大写）和Long.parseLong(..). 我相信这是容器正在做的事情，但它受到intserlvet 规范的限制。
回答by BalusC
Since Servlet 3.1 (Java EE 7), a new method is available, getContentLengthLong():
从 Servlet 3.1 (Java EE 7) 开始，提供了一种新方法getContentLengthLong()：
long contentLength = request.getContentLengthLong();
The same applies to its counterpart on the response, setContentLengthLong():
这同样适用于响应中的对应项setContentLengthLong()：
response.setContentLengthLong(file.length());
