xwork-validator-1.0.2.dtd 校验时出错
校验文件：/netdisk/src/action/LoginAction.validator.xml
文件内容：
<?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>
<validator type="requiredstring">
<param name="fieldName">username</param>
<message>用户名必须输入</message>
</validator>
<validator type="requiredstring">
<param name="fieldName">password</param>
<message>密码必须输入</message>
</validator>
<validator type="requiredstring">
<param name="fieldName">validationCode</param>
<message>验证码必须输入</message>
</validator>
</validators>

错误信息：
Referenced file contains errors (http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd). For more information, 
right click on the message and select "Show Details..." LoginAction.validator.xml
netdisk/WebRoot/WEB-INF/classes/action 第 1 行 XML Problem

Show Details：
The errors below were detected when validating the file "xwork-validator-1.0.2.dtd" via the file "LoginAction.validator.xml". In most cases these errors can be detected by validating "xwork-validator-1.0.2.dtd" directly. However it is possible that errors will only occur when xwork-validator-1.0.2.dtd is validated in the context of LoginAction.validator.xml.

------解决方案--------------------
换成
<?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>

</validators>