Struts File Upload

To upload a file,the interface org.apache.struts.upload.FormFile is used in the application. To represents a file that has been uploaded by the client,this interface is used. It is the only class or interface in the upload package which is typically referenced directly by a Struts application

Creating Form Bean

In our example,the form bean class contains one property theFile, which is of type org.apache.struts.upload.FormFile. The following example is the code of the 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;
}
}

Creating Action Class

To retrieve the reference of the uploaded file,the action class simply calls getTheFile() function on the FormBean object. To get uploaded file and its information, the reference of the FormFile is used . The following is code of our action class called strutsUploadAction.java:

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");
}
}

Defining form Bean in struts-config.xml file

In struts-config.xml file for defining the form bean,add the following entry.

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

Defining Action Mapping

In struts-config.xml file,add the following action mapping entry :

Developing jsp page

Code of the jsp (FileUpload.jsp) file to upload is as follows:

<%@ 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

Go to Struts\strutstutorial directory and type ant on the command prompt,to build and deploy application. This will help to deploy application. Open the browser and type FileUpload.jsp page. Your browser should display the file upload form as follows:

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