我目前正在尝试学习Struts2。
我创建了一个表单、一个处理表单的操作、一个验证表单的 XML 以及 struts.xml 中的操作。
每次显示表单时,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会显示错误。
这是相关代码:
<!-- /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>
我需要做什么或更改才能让 struts 第一次显示表单而不抱怨所有空白字段?
是的,我知道这个问题。通常我使用以下解决方法。
Mark execute
with org.apache.struts2.interceptor.validation.SkipValidation
@SkipValidation
public String execute() throws Exception { return SUCCESS; }
所以第一遍将忽略验证方法。但input将被验证。
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