test/java/multipart/app.java


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import java.io.IOException;
import java.io.PrintWriter;

import java.util.Map;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;
import javax.servlet.annotation.MultipartConfig;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.servlet.http.Part;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/")
@MultipartConfig(
        fileSizeThreshold   = 1024 * 1024 * 1,  // 1 MB
        maxFileSize         = 1024 * 1024 * 10, // 10 MB
        maxRequestSize      = 1024 * 1024 * 15 // 15 MB
)
public class app extends HttpServlet
{
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException
    {
        response.setContentType("text/html;charset=UTF-8");

        // Create path components to save the file
        final String path = request.getParameter("destination");
        final Part filePart = request.getPart("file");
        final String fileName = getFileName(filePart);

        OutputStream out = null;
        InputStream filecontent = null;
        final PrintWriter writer = response.getWriter();

        try {
            out = new FileOutputStream(new File(path + File.separator
                                                + fileName));
            filecontent = filePart.getInputStream();

            int read = 0;
            final byte[] bytes = new byte[1024];

            while ((read = filecontent.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }
            writer.println(fileName + " created at " + path);

        } catch (FileNotFoundException fne) {
            writer.println("You either did not specify a file to upload or are "
                            + "trying to upload a file to a protected or nonexistent "
                            + "location.");
            writer.println("<br/> ERROR: " + fne.getMessage());

        } finally {
            if (out != null) {
                out.close();
            }
            if (filecontent != null) {
                filecontent.close();
            }
            if (writer != null) {
                writer.close();
            }
        }

        return;
    }

    private String getFileName(final Part part) {
        final String partHeader = part.getHeader("content-disposition");

        for (String content : part.getHeader("content-disposition").split(";"))
        {
            if (content.trim().startsWith("filename")) {
                return content.substring(
                    content.indexOf("=") + 1).trim().replace("\"", "");
            }
        }
        return null;
    }
}