struts2 validation问题

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Struts JSP Java DAO Hibernate

在struts2中做了一个登录校验的测试，发现在jsp页面中不管输入什么字符，都会执行LoginAction.class中的execute method。

jsp：

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Struts2_sps</title>
<s:head/>
</head>
<body>
	<s:actionerror/>
	<s:form action="login">
		<table>
			<s:textfield name="userName" label="帐号"/>
			<s:password  name="password" label="密码"/>
			<tr>
				<td colspan="2" align="center">
					<s:submit theme="simple" value="提交"/>
					<s:reset  theme="simple" value="重置"/>
				</td>
			</tr>
		</table>
	</s:form>
</body>
</html>

struts.xml

<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
	"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<include file="struts-default.xml"/>
	<package name="default" extends="struts-default">
		<action name="login" class="com.abcom.struts2.sps.action.LoginAction">
			<result name="success">success.jsp</result>
			<result name="input">default.jsp</result>
		</action>
	</package>
</struts>

LoginAction.java

package com.abcom.struts2.sps.action;

import com.abcom.struts2.sps.hibernate.dao.SysUserDao;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
    private static final long serialVersionUID  = 4210832451L;
    
    private String userName;
    private String password;
    
    private String msg;
    
    public String getMsg() {
        return msg;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String execute() throws Exception
    {
        SysUserDao dao      = new SysUserDao();
        boolean loginFlag   = dao.isExist(userName, password);
        if(loginFlag)
            return SUCCESS;
        else
        {
            this.addActionError("登录失败！");
            return INPUT;
        }
    }
}

LoginAction-validation.xml

<?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="userName">
		<field-validator type="requiredString">
			<message>You must enter a name</message>
		</field-validator>
	</field>
	<field name="password">
		<field-validator type="requiredString">
			<message>You must enter a password</message>
		</field-validator>
	</field>
</validators>

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