Struts登录Demo提交报错及Jquery UI拖拽容器不滚动问题求助

Hey there, let's break down and solve your two separate issues step by step!

Since you're running on Tomcat 8 and Java 9, these backend techs don't directly affect frontend jQuery UI behavior—so let's focus on frontend configurations:

• Check jQuery & jQuery UI Version Compatibility: Older versions of jQuery UI might have bugs with scrollable sortable containers. Make sure you're using compatible versions (e.g., jQuery 3.x paired with jQuery UI 1.12.x).
• Enable Scroll in Sortable Configuration: Explicitly set the scroll option to true (it's enabled by default, but sometimes needs explicit declaration) and tweak scroll sensitivity/speed if needed:

  $("#your-sortable-container").sortable({
    scroll: true,
    scrollSensitivity: 80, // Adjust based on your needs
    scrollSpeed: 15       // Controls how fast the container scrolls
  });
  

• Validate Container CSS: Ensure your sortable container has a fixed height and overflow property set to enable scrolling:

  #your-sortable-container {
    height: 400px;
    overflow-y: auto; /* Shows vertical scrollbar when content overflows */
  }
  

Let's troubleshoot this by checking key files and configurations, starting with the most common culprits:

Step 1: First, Check Console Error Details #

The console error is your biggest clue! Common errors include:

• ClassNotFoundException: Means Tomcat can't find your LoginAction class (check deployment paths below).
• NoActionMappingFound: Your struts-config.xml doesn't map the form's action URL to an Action class.
• InvalidActionForm: Mismatch between your UserForm and the form fields in login.jsp.

Step 2: Verify Struts Configuration Files #

struts-config.xml #

• Ensure your <form-bean> maps correctly to UserForm:

  <form-beans>
    <form-bean name="userForm" type="com.yourpackage.UserForm" />
  </form-beans>
  

• Confirm your <action> has proper mappings, including input destination and forwards for success/error:

  <action-mappings>
    <action path="/login" 
            type="com.yourpackage.LoginAction" 
            name="userForm" 
            scope="request" 
            validate="true" 
            input="/login.jsp">
      <forward name="success" path="/success.jsp" />
      <forward name="error" path="/error.jsp" />
    </action>
  </action-mappings>
  

  Note: If you don't need form validation, set validate="false" to skip the validation step.

web.xml #

Make sure the Struts ActionServlet is configured correctly:

<servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
    <param-name>config</param-name>
    <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
</servlet-mapping>

Step 3: Validate LoginAction & UserForm Code #

UserForm.java #

Ensure it extends ActionForm and has proper getters/setters for your form fields:

package com.yourpackage;

import org.apache.struts.action.ActionForm;

public class UserForm extends ActionForm {
  private String username;
  private String password;

  // Getters and Setters
  public String getUsername() { return username; }
  public void setUsername(String username) { this.username = username; }
  public String getPassword() { return password; }
  public void setPassword(String password) { this.password = password; }
}

LoginAction.java #

Make sure it extends Action and returns the correct forward based on login logic:

package com.yourpackage;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class LoginAction extends Action {
  @Override
  public ActionForward execute(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request, HttpServletResponse response) throws Exception {
    UserForm userForm = (UserForm) form;
    
    // Replace with your actual login validation logic
    if ("admin".equals(userForm.getUsername()) && "admin123".equals(userForm.getPassword())) {
      return mapping.findForward("success");
    } else {
      request.setAttribute("errorMsg", "Invalid username or password");
      return mapping.findForward("error");
    }
  }
}

Step 4: Check Eclipse Deployment Setup #

From your Eclipse path screenshot, confirm:

• Your project's Deployment Assembly includes the src folder (so compiled .class files are deployed to WEB-INF/classes).
• The WEB-INF folder in your deployed Tomcat directory contains struts-config.xml, web.xml, and the compiled class files for LoginAction and UserForm.
• The form in login.jsp uses the correct action URL (e.g., <form action="login.do" method="post">) and field names match UserForm properties.

内容的提问来源于stack exchange，提问作者LuciferNoSad