报错:The processing instruction target matching “[xX][mM][lL]” is not allowed.
在写struts配置文件struts.xml时<?xml version="1.0" encoding="UTF-8" ?>报错:The processing instruction target matching "[xX][mM][lL]" is not allowed.
解决方式（适用于所有.xml）
将<?xml version="1.0" encoding="UTF-8" ?>前多余的注释、空格和空行等去掉即可。
