解析：这个最大值是在struts2的源文件“struts2-core-2.0.11.1.jar\org\apache\struts\ default.properties”中的struts.multipart.maxSize=2097152语句，如果想改大的话，就重新设定它，有两种方法：
一种是重写：struts.properties文件。
二是在struts.xml中加入常量来改变它如“ Java代码
<constant name="struts.multipart.maxSize" value="10000000" />
当然了，也有struts2的拦截器可以限制文件的类型、大小等，但是当上传文件大小2M后，这个拦截器就不起作用了，只用小于2M（默认大小）的时候才起作用。那是因为：common-fileupload组件默认最大支持上传文件的大小为2M,当我们上传大于2M的文件时，就会出现上面所说的异常。是这个异常的发生导致了fileUpload拦截器没有机会执行，所以看到的是页面没有任何变化，也没有任何提示信息，只是在控制台打印出了上面的那些上传文件过大的异常。
我解决问题的过程：
刚开始只是在struts.xml文件最上部加入
<constant name="struts.multipart.maxSize" value="1000000000" />
pt">但还是报同样的错误。
接着查看struts.properties文件里的配置为：
### Load custom default resource bundles
struts.custom.i18n.resources=MessageResource
struts.multipart.maxSize=50097152
### character encoding
struts.i18n.encoding=GBK
修改为
### Load custom default resource bundles
struts.custom.i18n.resources=MessageResource
struts.multipart.maxSize=1000000000
### character encoding
struts.i18n.encoding=GBK
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