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Struts File Upload

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Wie man eine File in den struts hochlädt

Um eine File zu hochladen, wird die Schnittstelle org.apache.struts.upload.FormFile in der Anwendung benutzt. Stellt eine File, die vom Klienten gehochladen worden ist, diese Schnittstelle wird verwendet dar. Es ist die einzige Kategorie oder die Schnittstelle im Antriebskraftpaket, das gewöhnlich direkt durch eine strut anwendung bezogen wird




Herstellen der Form-Bohne

In unserem Beispiel enthält die Formbohne Kategorie eine theFile Eigenschaft, die von der Art org.apache.struts.upload.FormFile ist. Das folgende Beispiel ist der Code des FormBean (StrutsUploadForm.java):

package academictutorials;

import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;

/**
* Form bean for Struts File Upload.
*
*/
public class StrutsUploadForm extends ActionForm
{
private FormFile theFile;

/**
* @return Returns the theFile.
*/
public FormFile getTheFile()
{
return theFile;
}
/**
* @param theFile The FormFile to set.
*/
public void setTheFile(FormFile theFile)
{
this.theFile = theFile;
}
}



Verursachen der Tätigkeit Kategorie

Um den Hinweis der gehochladenen File zurückzuholen, benennt die Tätigkeit Kategorie einfach getTheFile () Funktion auf dem FormBean Gegenstand. Um gehochladene File und seine Informationen zu erhalten, wird der Hinweis des FormFile verwendet. Das folgende ist Code unserer Tätigkeit Kategorie, die strutsUploadAction.java genannt wird:

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;
import org.apache.struts.upload.FormFile;

/**
* Struts File Upload Action Form.
*
*/
public class StrutsUploadAction extends Action
{
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
StrutsUploadForm myForm = (StrutsUploadForm)form;

// Process the FormFile
FormFile myFile = myForm.getTheFile();
String contentType = myFile.getContentType();
String fileName = myFile.getFileName();
int fileSize = myFile.getFileSize();
byte[] fileData = myFile.getFileData();
System.out.println("contentType: " + contentType);
System.out.println("File Name: " + fileName);
System.out.println("File Size: " + fileSize);

return mapping.findForward("success");
}
}



Definieren der Form Bohne in der struts-config.xml File

In der struts-config.xml File für das Definieren der Formbohne, die folgende Eintragung hinzufügen.

<form-bean name="FileUpload" type="academictutorials.StrutsUploadForm"/>



Definieren des Tätigkeit Diagramms
In der struts-config.xml File die folgende Tätigkeit hinzufügen, die Eintragung abbildet:
<action
path="/FileUpload"
type="academictutorials.StrutsUploadAction"
name="FileUpload"
scope="request"
validate="true"
input="/pages/FileUpload.jsp">
<forward name="success" path="/pages/uploadsuccess.jsp"/>
</action>



Sich entwickelnde jsp Seite

Code der zu hochladen jsp (FileUpload.jsp) File ist, wie folgt:

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

<html:html locale="true">
<head>
<title>Struts File Upload Example</title>
<html:base/>
</head>
<body bgcolor="white">
<html:form action="/FileUpload" method="post" enctype="multipart/form-data">
<table>
<tr>
<td align="center" colspan="2">
<font size="4">Please Enter the Following Details</font>
</tr>

<tr>
<td align="left" colspan="2">
<font color="red"><html:errors/></font>
</tr>



<tr>
<td align="right">
File Name
</td>
<td align="left">
<html:file property="theFile"/> 
</td>
</tr>


<tr>
<td align="center" colspan="2">
<html:submit>Upload File</html:submit>
</td>
</tr>
</table>


</html:form>
</body>
</html:html>

Note that we have set the encrypt property of form to enctype="multipart/form-data".

The following code for the success page (uploadsuccess.jsp) is as follows:

<html>

<head>
<title>Success</title>
</head>

<body>

<p align="center"><font size="5" color="#000080">File Successfully Received</font></p>

</body>

</html>



In index.jsp to call the form,add the following line.

<li>
<html:link page="/pages/FileUpload.jsp">Struts File Upload</html:link>
<br>
Example shows you how to Upload File with Struts.
</li>



Building Example and Testing

Zu den struts \ zum strutstutorial Verzeichnis gehen und Ameise auf dem Befehlseingabeformat, zum Bau schreiben und Anwendung entfalten. Dieses hilft, Anwendung zu entfalten. Die Datenbanksuchroutine öffnen und FileUpload.jsp Seite schreiben. Deine Datenbanksuchroutine sollte die File Antriebskraftform anzeigen, wie folgt:





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