edu.usf.cutr.BaseController.java Source code

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Here is the source code for edu.usf.cutr.BaseController.java

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/*
 * Copyright (C) 2015 University of South Florida (cagricetin@mail.usf.edu)
 *
 * 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 edu.usf.cutr;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletResponse;

import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;
import org.springframework.http.server.ServletServerHttpResponse;

public abstract class BaseController {

    /**
     * Size of a byte buffer to read/write file
     */
    private static final int BUFFER_SIZE = 4096;

    Logger logger = Logger.getLogger(getClass().getName());

    protected void createJSONResponse(HttpServletResponse response, Object jsonBean) {
        createJSONResponse(response, jsonBean, MediaType.APPLICATION_JSON);
    }

    protected void createJSONResponse(HttpServletResponse response, Object jsonBean, MediaType jsonMimeType) {
        MappingJacksonHttpMessageConverter jsonConverter = new MappingJacksonHttpMessageConverter();
        if (jsonConverter.canWrite(jsonBean.getClass(), jsonMimeType)) {
            try {
                jsonConverter.write(jsonBean, jsonMimeType, new ServletServerHttpResponse(response));
            } catch (IOException ex) {
                //            logger.error(ex);
            } catch (HttpMessageNotWritableException ex) {
                //            logger.error(ex);
            }
        }
    }

    protected void createStaticProtoBufFile(HttpServletResponse response, String filename) throws IOException {
        File downloadFile = new File(filename);

        FileInputStream inputStream = new FileInputStream(downloadFile);

        // get MIME type of the file
        String mimeType = "application/x-google-protobuf";

        // set content attributes for the response
        response.setContentType(mimeType);
        response.setContentLength((int) downloadFile.length());

        // set headers for the response
        String headerKey = "Content-Disposition";
        String headerValue = String.format("attachment; filename=\"%s\"", downloadFile.getName());
        response.setHeader(headerKey, headerValue);

        // get output stream of the response
        OutputStream outStream = response.getOutputStream();

        byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead = -1;

        // write bytes read from the input stream into the output stream
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, bytesRead);
        }

        inputStream.close();
        outStream.close();

    }

}