Upload file by using servlet

Code: servlet
package com.servlet.FileUploadServlet;

import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadServlet extends HttpServlet {

    /**
     * The base upload directory. In this directory all uploaded files will
     * be stored. With the applet param tag 'directory' you can create a
     * subdirectory for a user.
     * See http://www.javaatwork.com/parameters.html#directory for more
     * information about the 'directory' param tag. For a Windows environment
     * the BASE_DIRECTORY can be e.g. * 'c:/temp' for Linux environment '/tmp'.
     */
    private static final String BASE_DIRECTORY = "/images";

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);

        // check if the http request is a multipart request
        // with other words check that the http request can have uploaded files
        if (isMultipart) {

            //  Create a factory for disk-based file items
            FileItemFactory factory = new DiskFileItemFactory();

            //  Create a new file upload handler
            ServletFileUpload servletFileUpload = new ServletFileUpload(factory);

            // Set upload parameters
            // See Apache Commons FileUpload for more information
            // http://jakarta.apache.org/commons/fileupload/using.html
            servletFileUpload.setSizeMax(-1);

            try {

                String directory = "";

                // Parse the request
                List items = servletFileUpload.parseRequest(request);

                // Process the uploaded items
                Iterator iter = items.iterator();

                while (iter.hasNext()) {
                    FileItem item = (FileItem) iter.next();

                    // the param tag directory is sent as a request parameter to
                    // the server
                    // check if the upload directory is available
                    if (item.isFormField()) {

                        String name = item.getFieldName();

                        if (name.equalsIgnoreCase("directory")) {

                            directory = item.getString();
                        }

                        // retrieve the files
                    } else {

                        // the fileNames are urlencoded
                        String fileName = URLDecoder.decode(item.getName());

                        File file = new File(directory, fileName);
                        file = new File(BASE_DIRECTORY, file.getPath());

                        // retrieve the parent file for creating the directories
                        File parentFile = file.getParentFile();

                        if (parentFile != null) {
                            parentFile.mkdirs();
                        }

                        // writes the file to the filesystem
                        item.write(file);
                    }
                }

            } catch (Exception e) {
                e.printStackTrace();
                response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            }

            response.setStatus(HttpServletResponse.SC_OK);

        } else {
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        }


    }
}

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Code: jsp

<form name="uploadForm" action="FileUploadServlet" enctype="multipart/form-data" method="POST">

   <input type="file" name="file1" readonly="readonly" size="70">

   <input type="Submit" value="Upload File"><br>

</form>

---

Code: web.xml

<servlet>

        <servlet-name>FileUploadServlet</servlet-name>

        <servlet-class>com.servlet.FileUploadServlet</servlet-class>

</servlet>

<servlet-mapping>

        <servlet-name>FileUploadServlet</servlet-name>

        <url-pattern>/FileUploadServlet</url-pattern>

</servlet-mapping>

---

Link download FileUpload component: here
Link download Common IO component: here