tomcat7.0.63之前：
maxPostSize    The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The limit can be disabled by setting this attribute to a value less than or equal to 0. If not specified, this attribute is set to 2097152 (2 megabytes).
設定為0和負數均可以代表不限制

tomcat7.0.63（包含）之後：
maxPostSize    The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The limit can be disabled by setting this attribute to a value less than zero. If not specified, this attribute is set to 2097152 (2 megabytes).
不可以設定為0，只能是負數代表不限制
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作者：whatever8975757 
來源：CSDN 
原文：https://blog.csdn.net/whatever8975757/article/details/60576188?utm_source=copy 
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