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Using file upload specific tag from Struts2 With this example, I shall try to touch upon a very specific functionality of Struts2 as far as file upload is concerned. But I am presently struck up with a very common requirement of mine whereby I shall try to write sample code and try to get the file name that is being chosen from the browser end of GUI, and use this file name to create the final file at the server end. Like in this example I shall be using some input/output stream in order to recreate the file that is being sent/uploaded. But in this way of thinking I am basically using some hard coded file name by presuming the file name this would be, which is I think bit not required. Coming back to this example, I shall try to explain various files used in this example starting from the JSP file, to the Action class and the struts.xml file. sample-upload.jsp

<%@ taglib uri="/struts-tags" prefix="struts2"%>
<html>
<head>
<link rel="stylesheet" type="text/css" href="/sample.css" />
</head>
<body>
<struts2:actionerror cssClass="ss"/>
<struts2:form id="f" name="fUpload" 
                     enctype="multipart/form-data" 
                     method="post" action="demo" 
                     namespace="/upload-example">
<struts2:file name="fileUploaded"/>
<struts2:submit value="Upload"/>
</struts2:form>
</body>
</html>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.multipart.saveDir" value="c:/tmp" />
    <package name="upload-example" namespace="/upload-example"
                 extends="struts-default">
        <action name="demo" class="sample.ExampleUploadFile" 
	                    method="saveFile">
                <result name="success">/sample1.jsp</result>
        </action>
    </package>
</struts>

ExampleUploadFile.java

package sample;
import com.opensymphony.xwork2.ActionSupport;
import java.io.*;
import org.apache.struts2.interceptor.ParameterAware;
import java.util.Map;

public class ExampleUploadFile extends ActionSupport 
{
  private File fileUploaded;

  public void setFileUploaded(File argFile) {
      fileUploaded = argFile;
  }
  public File getFileUploaded() {
      return fileUploaded;
  }
  public String saveFile() {
      System.out.println("File name :"+fileUploaded.getName());
      try{
	    //This is the hard coded file name with path
		//which I was refering about, in my this writing.
		//I am not sure how to avoid these lines of code
		//in order to upload a file from client end 
		//to server end without knowing the file choosen.
		//and ways to find automatically moved the file
		//being uploaded to its destination.
        DataOutputStream dout = new DataOutputStream(
                      new FileOutputStream("c:/tmp1/test.pdf"));
        DataInputStream din = new DataInputStream(
                      new FileInputStream(fileUploaded));
        byte[] bt = new byte[1024];
        while(din.read(bt) != -1) {
          dout.write(bt,0,bt.length);
        }
      } catch (Exception ex) {
          ex.printStackTrace();
      }
      return "success";
  }
}

Please be informed that this is not the only way of doing this task, there may be many other and better ways of coding any given problem on hand. As I have already mentioned, I am still looking for some ways (if any) to achieve file upload using the file tag from browser to the server's predefined folder, and there will be no need to code file recreation as is done in this action class's saveFile method. If you are aware or able to do this using Struts2 , then please do share your thought on this (if you can).

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