Struts Validation in an ActionForm

• struts-config.xml

    <struts-config>
        <form-beans>
            <form-bean name="logonForm" type="net.jcj.LogonForm"/>
        </form-beans>
        <action-mappings>
            <action path="/Logon" forward="/pages/Logon.jsp"/>
            <action path="/LogonSubmit" type="app.jcj.LogonAction" name="logonForm" 
               scope="request" validate="true" input="/pages/Logon.jsp">
                <forward name="success" path="/pages/Welcome.jsp"/>
                <forward name="failure" path="/pages/Logon.jsp"/>
            </action>
        </action-mappings>
        <message-resources parameter="resources.application"/>
    </struts-config>

• net.jcj.LogonForm

package net.jcj;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;

public class LogonForm extends ActionForm
{
  private String userId = null;
  private String password = null;

  public void setUserId (String userId){
    this.userId = userId ;
  }

  public String getUserId(){
    return this.userId ;
  }

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

  public String getPassword(){
    return this.password;
  }

    /**
     * Resets all properties to their default values.
     */
    public void reset(ActionMapping mapping, HttpServletRequest request) {
      this.userId = null;
      this.password = null;
    }

    /**
     * Validates the form.  Returns a list of action
     * Of course in a production environment, your rules would be far more strict than this.
     */
  public ActionErrors validate( 
      ActionMapping mapping, HttpServletRequest request ) {
      ActionErrors errors = new ActionErrors();
      
      if( getUserId() == null || getUserId().length() < 1 ) {
        errors.add("userId",new ActionMessage("error.userid.required"));
      }
      if( getPassword() == null || getPassword().length() < 1 ) {
        errors.add("password",new ActionMessage("error.password.required"));
      }

      return errors;
  }

}