Centos7.1 命令行与图形化界面登陆

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
<field name="upload">
<field-validator type="fieldexpression">
<param name="expression"><![CDATA[upload.length() > 0]]></param>
<message>File cannot be empty</message>
</field-validator>
</field>
<field name="caption">
<field-validator type="requiredstring">
<message>Caption cannot be empty</message>
</field-validator>
</field>
</validators>

其中的"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
会报 Connection reset
这个什么错误啊，这个校验框架是我在STRUTS2中的例子里拿出来的。。。。