FileUpload.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kaaproject.kaa.server.admin.servlet;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;
import org.kaaproject.kaa.server.admin.services.cache.CacheService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

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

public class FileUpload extends HttpServlet {

  private static final long serialVersionUID = 2959115024959843564L;

  private static final Logger LOG = LoggerFactory.getLogger(FileUpload.class);

  @Autowired
  private CacheService cacheService;

  @Override
  public void init(ServletConfig config) throws ServletException {
    super.init(config);
    SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
        config.getServletContext());
  }
  //CHECKSTYLE:OFF
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    //CHECKSTYLE:ON
    ServletFileUpload upload = new ServletFileUpload();

    try {
      FileItemIterator iter = upload.getItemIterator(request);
      if (iter.hasNext()) {
        FileItemStream item = iter.next();
        String name = item.getFieldName();

        LOG.debug("Uploading file '{}' with item name '{}'", item.getName(), name);

        InputStream stream = item.openStream();

        // Process the input stream
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        Streams.copy(stream, out, true);

        byte[] data = out.toByteArray();

        cacheService.uploadedFile(name, data);
      } else {
        LOG.error("No file found in post request!");
        throw new RuntimeException("No file found in post request!");
      }
    } catch (Exception ex) {
      LOG.error("Unexpected error in FileUpload.doPost: ", ex);
      throw new RuntimeException(ex);
    }

  }
}