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Verstehen The Struts ActionForm Class

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Was ist ActionForm?

Ein ActionForm ist ein JavaBean, das das org.apache.struts.action.ActionForm verl�ngert. Der ActionForm Gegenstand wird automatisch auf der Bedienerseite mit den Daten bev�lkert, die von einer Form auf der Klient Seite eingegeben werden und ActionForm beh�lt den Lernabschnitzustand f�r die Netzanwendung bei und.

Anfangs verursachen wir zuerst die Kategorie, die AddressForm genannt wird, das die ActionForm Kategorie verl�ngert. Der folgende Code beschreibt ActionForm.java.

package academictutorials;

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

/**
* Form bean for the Address Entry Screen.
*
*/
public class AddressForm extends ActionForm
{
private String name=null;
private String address=null;
private String emailAddress=null;

public void setName(String name)
{
this.name=name;
}

public String getName()
{
return this.name;
}

public void setAddress(String address)
{
this.address=address;
}

public String getAddress()
{
return this.address;
}

public void setEmailAddress(String emailAddress)
{
this.emailAddress=emailAddress;
}

public String getEmailAddress()
{
return this.emailAddress;
}

/**
* Reset all properties to their default values.
*
* @param mapping The mapping used to select this instance
* @param request The servlet request we are processing
*/
public void reset(ActionMapping mapping, HttpServletRequest request)
{
this.name=null;
this.address=null;
this.emailAddress=null;
}

/**
* Reset all properties to their default values.
*
* @param mapping The mapping used to select this instance
* @param request The servlet request we are processing
* @return errors
*/
public ActionErrors validate(
ActionMapping mapping, HttpServletRequest request )
{
ActionErrors errors = new ActionErrors();

if( getName() == null || getName().length() < 1 )
{
errors.add("name",new ActionMessage("error.name.required"));
}
if( getAddress() == null || getAddress().length() < 1 )
{
errors.add("address",new ActionMessage("error.address.required"));
}
if( getEmailAddress() == null || getEmailAddress().length() < 1 )
{
errors.add("emailaddress",new ActionMessage("error.emailaddress.required"));
}
return errors;
}
}



Die oben genannte Kategorie validiert Adresse Formdaten und bev�lkert sie. Um Benutzereing�nge zu validieren, wird die Validierung () Methode verwendet. Fehlermeldungen werden ActionMapping Gegenstand hinzugef�gt, wenn irgendwelche oder alles auf der Form leer sind auff�ngt. Das in der folgenden Version ActionError merken wird entfernt und jetzt benutzen wir ActionMessage Kategorie.

Jetzt verursachen wir das vorbildliche Teil der Anwendung, die Action Kategorie genannt wird. In unserer T�tigkeit leitet Kategorie einfach Antrag an das Success.jsp weiter. Das folgende Beispiel ist der Code f�r AdessAction.java Kategorie

package academictutorials;

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 AddressAction extends Action
{
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
return mapping.findForward("success");
}
}



Im struts-config.xml m�ssen wir eine Eintragung f�r Formbohne verursachen. In der struts-config.xml Akte die folgenden Linien hinzuf�gen:

<form-bean name="AddressForm" type="academictytorials.AddressForm"/>

In der struts-config.xml Akte die folgende Linie f�r die Behandlung der T�tigkeit �/Address.do� hinzuf�gen:

<action path="/Address" type="roseindia.net.AddressAction" name="AddressForm" scope="request" validate="true" input="/pages/Address.jsp">

F�r das Eintragen der Adresse Details, die Address.jsp Seite herstellen, die unsere Form ist. F�r Address.jsp kodieren ist, wie folgt:

<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>

<html:html locale="true">

<head>

<title><bean:message key="welcome.title"/></title>

<html:base/>

</head>

<body bgcolor="white">

<html:form action="/Address">

<html:errors/>

<table>

<tr>

<td align="center">
<font size="4">Please Enter the Following Details</font>
</tr>
<tr>
<td align="right">
Name
</td>
<td align="left">
<html:text property="name" size="30" maxlength="30"/>
</td>
</tr>
<tr>
<td align="right">
Address
</td>
<td align="left">
<html:text property="address" size="30" maxlength="30"/>
</td>
</tr>

<tr>
<td align="right">
E-mail address
</td>
<td align="left">
<html:text property="emailAddress" size="30" maxlength="30"/>
</td>
</tr>
<tr>
<td align="right">
<html:submit>Save</html:submit>
</td>
<td align="left">
<html:cancel>Cancel</html:cancel>
</td>
</tr>
</table>
</html:form>
</body>
</html:html>

At first,the user enters the values in the form and then click on submit form. On the server side,form  validation is done.The Eeror message is displays on the jsp page . Use the following code to display the error on the jsp page the <html:errors/> > tag is used. The <html:errors/> tag displays all the errors in one go.  To create text box the <html:text .../> nbsp;

e.g.

<html:text property="address" size="30" maxlength="30"/>

To enter the address,the above tag is used.In form-bean,the address is retrieved from and later stored in the property named address. Using <html:submit>Save</html:submit> tag we ca create the submit button and using <html:cancel>Cancel</html:cancel> tag we can create Cancel button.

To create a link for testing the Address.jsp form,add the following line in index.jsp.

<html:link page="/pages/Address.jsp">Test Address Form</html:link>

To test the newly created screen,build the application and click on the Test the Address Form link on the index page .





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