FileUploading.UploadServlet.java Source code

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Here is the source code for FileUploading.UploadServlet.java
Source

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package FileUploading;

import java.io.*;
import java.util.*;

import javax.servlet.ServletConfig;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.output.*;

/**
 *
 * @author Mohanned
 */
public class UploadServlet extends HttpServlet {

    private boolean isMultipart;
    private String filePath;
    private int maxFileSize = 50 * 1024;
    private int maxMemSize = 4 * 1024;
    private File file;

    @Override
    public void init() throws ServletException {
        filePath = getServletContext().getInitParameter("file-upload");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        throw new ServletException("Get Method used with " + getClass().getName() + " : POST method required .");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //check that we have a file upload request 
        isMultipart = ServletFileUpload.isMultipartContent(req);

        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();
        if (!isMultipart) {

            String title = "";
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet upload</title>");
            out.println("<body>");
            out.println("<body>");
            out.println("<p> No file uploaded</p>");
            out.println("</body>");
            out.println("</html>");
            return;
        }

        DiskFileItemFactory factory = new DiskFileItemFactory();
        // maximum size that will be stored in the memory
        factory.setSizeThreshold(maxMemSize);
        // location to save data that is larger than maxMemsize
        factory.setRepository(new File("C:\\temp"));

        //create a new file upload handler 
        ServletFileUpload upload = new ServletFileUpload(factory);
        //maximum file size to be upload 
        upload.setSizeMax(maxFileSize);
        try {
            //parse the requset to get file items 
            List fileItems = upload.parseRequest(req);
            // process the uploaded file items
            Iterator i = fileItems.iterator();

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servket Upload</title>");
            out.println("</head>");
            out.println("<body>");
            while (i.hasNext()) {
                FileItem fi = (FileItem) i.next();
                if (!fi.isFormField()) {
                    //get the uploaded file parameters
                    String fieldName = fi.getFieldName();
                    String fileName = fi.getName();
                    String contentType = fi.getContentType();
                    boolean isInMemory = fi.isInMemory();
                    long sizeInMemory = fi.getSize();

                    //write the file
                    if (fileName.lastIndexOf("\\") >= 0) {
                        file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\")));
                    } else {
                        file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\") + 1));
                    }
                    fi.write(file);
                    out.println("Uploaded file name : " + fileName + "<br>");
                }
            }
            out.println("</body>");
            out.println("</html>");
        } catch (Exception e) {
        }
    }
}