Problem redisplaying data user has entered within a form

Rodney Paul Fri, 12 Sep 2003 00:16:55 -0700

Hi All,

I am currently experiencing a problem in regards to redisplaying form data a user has entered within a form.

I am experiencing this problem both from ActionForm and LookupDispatchAction classes in a major project.

As a consequence I decided to write a very small login application to see if I could solve this problem.

The login application will display a user login application screen. If a user tries to login, and does so successfully a

welcome page is displayed. However if not successful a informative message should appear, as well as what the user has entered into the fields.

Unfortunately the data the the user has enetered never gets repopulated in the form text fields when login has been unsuccessful.

Has anyone got a solution to this problem. Any help would be appreciated.

Cheers

Rodney

ps. NOTE: The first screen the user sees comes directly from a JSP page (not from a redirect of a Action class to a JSP page).

pss. The code is shown below and is attached to this email.

Struts-Config.xml

--------------------------

<struts-config>
    <form-beans>
        <form-bean name="test.LoginActionForm" type="net.natdata.application.test.login.LoginActionForm" />
    </form-beans>

    <action-mappings>
        <action path="/LoginAction"
                type="net.natdata.application.test.login.LoginAction"
                name="test.LoginActionForm"
                input="/Login.jsp"
                scope="request"
                validate="true"
                parameter="method">
            <forward name="failure" path="/Login.jsp"/>
            <forward name="success" path="/LoginSuccessful.jsp"/>
        </action>
    </action-mappings>

    <message-resources parameter="resources.application" />
</struts-config>

Application Resources (Property file)

-----------------------------------------------------

button.login=Login
field.userIdentifier=User ID
field.password=Password

heading.login=Login

error.generalMessage=An error has occured and all processing has been suspended until further notice.
error.invalidPassword=The password you have entered is incorrect.
error.invalidUser=The user entered doesnt exist.

error.userIdentifier.required=A user id must be entered to log in.
error.password.required=A password must be entered to log in.

-------------

<%@ page language="java" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>

LoginSuccessful.jsp

-----------------------------

<%@ page language="java" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>

<html>
<head>
    <title>Login</title>
</head>
<body>
    <center><h1>Login</h1></center>
    <center>You have successfully logged into the system</center>
</body>
</html>

-------------------------------------

public class LoginActionForm extends ActionForm {
    // Variables used within the form.
    private String userIdentifier;
    private String password;
    private String method;


    public void setUserIdentifier(String userIdentifier) {
        this.userIdentifier = userIdentifier;
    }

    public String getUserIdentifier() {
        return userIdentifier;
    }

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

    public String getPassword() {
        return password;
    }

    public void setMethod(String method) {
        this.method = method;
    }

    public String getMethod() {
        return method;
    }


    public ActionErrors validate(ActionMapping actionMapping, HttpServletRequest httpServletRequest) {
        ActionErrors errors = new ActionErrors();
        boolean failure = false;

        if(method.equals("Login")) {
            if((userIdentifier == null) || (userIdentifier.trim().equals(""))) {
                errors.add(userIdentifier, new ActionError("error.userIdentifier.required"));
            }
            else {
                if((password == null) || (password.trim().equals(""))) {
                    errors.add(userIdentifier, new ActionError("error.password.required"));
                }
            }
        }

        return errors;
    }

    public void reset(ActionMapping mapping, HttpServletRequest request) {
        this.userIdentifier = null;
        this.password = null;
        this.method = null;
    }
}

-----------------------------

public class LoginAction extends LookupDispatchAction {
    protected java.util.Map getKeyMethodMap() {
        Map map = new HashMap();
        map.put("button.login", "login");
        return map;
    }

    public ActionForward login(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request, HttpServletResponse response)
                               throws IOException, ServletException {
        String target = "success";
        ActionErrors actionErrors = new ActionErrors();

        try {
            LoginActionForm loginForm = (LoginActionForm)form;
            if(!loginForm.getUserIdentifier().equals("user")) {
                actionErrors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.invalidUser"));
                target = "failure";
            }
            else if(!loginForm.getPassword().equals("password")) {
                actionErrors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.invalidPassword"));
                target = "failure";
            }
        }
        catch(Exception e) {
            actionErrors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.generalMessage"));
            target = "failure";
        }
        finally {
            if(!actionErrors.isEmpty()) {
                saveErrors(request, actionErrors);
            }
            return (ActionForward)mapping.findForward(target);
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd";>


<struts-config>
    <form-beans>
        <form-bean name="test.LoginActionForm" type="net.natdata.application.test.login.LoginActionForm" />
    </form-beans>
        
    <action-mappings>
        <action path="/LoginAction"
                type="net.natdata.application.test.login.LoginAction"
                name="test.LoginActionForm"
                input="/Login.jsp"
                scope="request"
                validate="true"
                parameter="method">
            <forward name="failure" path="/Login.jsp"/>
            <forward name="success" path="/LoginSuccessful.jsp"/>
        </action>
    </action-mappings>
    
    <message-resources parameter="resources.application" />
</struts-config>

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd";>

<web-app>
    <display-name>Login Application</display-name>
    
    <!-- Servlet definitions section -->
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>application</param-name>
            <param-value>resources.application</param-value>
        </init-param>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>2</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>2</param-value>
        </init-param>
        <init-param>
            <param-name>validate</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    
    <!-- Servlet Mapping section -->
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
    <!-- Session Config -->
    <session-config>
        <!--  30 minutes   -->
        <session-timeout>30</session-timeout>
    </session-config>
    
    <!-- Taglibs -->
    <taglib>
        <taglib-uri>/tags/struts-bean</taglib-uri>
        <taglib-location>/WEB-INF/lib/struts-bean.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>/tags/struts-html</taglib-uri>
        <taglib-location>/WEB-INF/lib/struts-html.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>/tags/struts-logic</taglib-uri>
        <taglib-location>/WEB-INF/lib/struts-logic.tld</taglib-location>
    </taglib>
</web-app>

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