File Upload (Using Struts)

Project Structure


web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
      <servlet-name>Front Controller</servlet-name>
      <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
      <init-param>
              <param-name>config</param-name>
              <param-value>/WEB-INF/struts-config.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
          <servlet-name>Front Controller</servlet-name>
          <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <jsp-config>
      <taglib>
          <taglib-uri>http://jakarta.apache.org/struts/tags-html</taglib-uri>
          <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
      </taglib>
  </jsp-config>
</web-app>

struts-config.xml

<!DOCTYPE struts-config>
<struts-config>
    <form-beans>
        <form-bean name="formbean" type="FileForm" />
    </form-beans>
    <action-mappings>
        <action path="/file" type="FileAction" name="formbean" input="/index.jsp" validate="true" scope="session">
            <forward name="done" path="/index.jsp" />
        </action>
    </action-mappings>
    <message-resources parameter="ApplicationResources"/>
</struts-config>

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<html:html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>File Upload</title>
</head>
<body>
<html:form action="/file" enctype="multipart/form-data" method="POST">
<html:file property="filename" ></html:file>
<input type="submit" name="upload" value="upload" ><html:errors property="er"/>
</html:form>
</body>
</html:html>

FileForm.java

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;
public class FileForm extends ActionForm
{
    private FormFile filename;
    public FormFile getFilename()
    {
        return filename;
    }
    public void setFilename(FormFile filename)
    {
        this.filename = filename;
    }
    public ActionErrors validate(ActionMapping mapping,HttpServletRequest request)
    {
        ActionErrors errors = new ActionErrors();
        if(filename.getFileSize()>5242880)
        {
            errors.add("er",new ActionError("error"));
        }
        return errors;
    }   
}

FileAction.java

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.Action;
import org.apache.struts.upload.FormFile;
import java.io.*;
public class FileAction extends Action
{
    private FileForm f;
    public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest req, HttpServletResponse res)throws Exception
    {
        f = (FileForm)form;
        FormFile nf = f.getFilename();
        File file = new File("e:\\"+nf.getFileName());
        FileOutputStream out = new FileOutputStream(file);
        out.write(nf.getFileData());
        out.close();
        return mapping.findForward("done");
    }
}

ApplicationResources.properties

error = File size must be less than 5MB.

Required Dependencies

http://www.4shared.com/rar/kNCxn8sP/FileUploadDependencies.html

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