1、java.io.CharConversionException: isHexDigit
ajax请求不能使用escape()进行编码，否则java会抛上面异常。encodeURIComponent()替代
2、Page-encoding specified in XML prolog (UTF-8) is different from that specified in page directive(utf-8)]
UTF-8与utf-8有区别！这应该跟tomcat设置的编码有关系(URIEncoding='utf-8')，最好使用大写。pageEncoding="UTF-8"
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