UploadDriverHandler.java

package ru.semiot.platform.apigateway.config;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.Part;

@WebServlet(urlPatterns = "/UploadDriverHandler", asyncSupported = true)
@MultipartConfig
public class UploadDriverHandler extends HttpServlet {

  private static final Logger logger = LoggerFactory.getLogger(UploadDriverHandler.class);
  private static final String ATTR_INPUSTREAM = "inputStreamFile";
  private static final String ATTR_FILENAME = "filename";
  private static final String PART_NAME = "bundlefile";

  protected void doPost(HttpServletRequest request,
                        HttpServletResponse response)
      throws ServletException, IOException {

    Part part = request.getPart(PART_NAME);

    if (part != null && part.getInputStream() != null && part.getSize() > 0) {
      HttpSession session = request.getSession(true);

      session.setAttribute(ATTR_INPUSTREAM, part.getInputStream());
      session.setAttribute(ATTR_FILENAME, part.getSubmittedFileName());

      response.sendRedirect("/config/ConfigurationDriver");
    } else {
      final AsyncContext ctx = request.startAsync();
      if (logger.isDebugEnabled()) {
        for (Part p : request.getParts()) {
          logger.debug("Part name: {}", p.getName());
          logger.debug("Part [{}] fileName: {}", p.getName(), p.getSubmittedFileName());
          logger.debug("Part [{}] size: {}", p.getName(), p.getSize());

          String partOfIS = p.getInputStream() == null ? "null" :
              new String(IOUtils.toByteArray(p.getInputStream(), 100));
          logger.debug("Part [{}] inputstream (first 100 bytes): {}", p.getName(), partOfIS);
        }
      }

      response.setStatus(HttpServletResponse.SC_BAD_REQUEST);

      ctx.complete();
    }
  }

}