一尘不染

如何告诉Struts2第一次显示表单时不对其进行验证?

jsp

我目前正在尝试学习Struts2。

我创建了一个表单,一个处理它的动作,一个用于验证它的XML以及struts.xml中的动作。

每次显示表单(即使是第一次),Struts2都会尝试进行验证,因此在用户有机会完成表单之前就显示错误。

以下是相关代码:

<!-- /WebContent/views/user/login.jsp -->
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ 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=ISO-8859-1">
<title>Login Page</title>
<s:head />
</head>
<body>
    <h1>Login Page</h1>
    <s:form action="executeUser">
        <s:textfield key="userBean.userName" />
        <s:password key="userBean.password" />
        <s:submit align="center" />
    </s:form>
</body>
</html>

<!-- /src/struts.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.devMode" value="true" />

    <package name="overviewofstruts" extends="struts-default">
        <action name="loginUser" class="hu.flux.user.LoginUserAction" method="execute">
            <result name="input">/views/user/login.jsp</result>
        </action>

        <action name="executeUser" class="hu.flux.user.LoginUserAction" method="execute">
            <result name="input">/views/user/login.jsp</result>
            <result name="success">/views/user/login_thankyou.jsp</result>
        </action>
    </package>

</struts>

// /src/hu/flux/user/LoginUserAction.java
package hu.flux.user;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginUserAction extends ActionSupport {

    private User userBean;
    public void setUserBean(User userBean) { this.userBean = userBean; }
    public User getUserBean() { return userBean; }

    public String login() throws Exception { return this.execute(); }
    public String execute() throws Exception { return  SUCCESS; }
    public String input() throws Exception { return INPUT; }
}

<!-- // /src/hu/flux/user/LoginUserAction-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>
 <validator type="requiredstring">
    <param name="fieldname">userBean.userName</param>
    <message>Username is required.</message>
 </validator>
 <validator type="requiredstring">
    <param name="fieldname">userBean.password</param>
    <message>Password is required.</message>
 </validator>

我需要做些什么或改变一下,以使支撑架首次显示该表格而不会抱怨所有空白字段?


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2020-06-10

共1个答案

一尘不染

是的,我知道这个问题。通常,我正在使用以下解决方法。

标记executeorg.apache.struts2.interceptor.validation.SkipValidation

@SkipValidation
public String execute() throws Exception { return  SUCCESS; }

因此,第一遍将忽略验证方法。但是 输入 将被验证。

2020-06-10