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Java example source code file (FileResource.java)

This example Java source code file (FileResource.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

buffer_length, file, fileoutputstream, fileresource, formdatacontentdisposition, formdataparam, get, ioexception, logger, outputstream, path, produces, response, string

The FileResource.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,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.deeplearning4j.ui.uploads;





import org.apache.commons.io.FileUtils;
import org.glassfish.jersey.media.multipart.MultiPartFeature;
import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataParam;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.*;

/**
 * Created by Juan on 25/02/2015.
 *
 * Original credit: https://github.com/juanpabloprado/dw-multipart/
 */

public abstract class FileResource {
    private static final Logger LOGGER = LoggerFactory.getLogger(FileResource.class);
    protected static String filePath = System.getProperty("java.io.tmpdir");

    @GET
    @Path("/{path}")
    @Produces({"application/json","text/plain"})
    public Response serve(@PathParam("path") String path) throws Exception {
        File currentFile = new File(this.filePath,path);
        if(!currentFile.exists())
            return Response.status(Response.Status.NOT_FOUND).build();
        else {
            String content = FileUtils.readFileToString(currentFile);

            if(path.endsWith(".json")) {
                return Response.ok(content,MediaType.APPLICATION_JSON).build();
            }
            else {
                return Response.ok(content,MediaType.TEXT_PLAIN_TYPE).build();
            }
        }
    }

    public FileResource() {

    }

    /**
     * The file path for uploads
     * @param filePath the file path for uploads
     */
    public FileResource(String filePath) {
        this.filePath = filePath;
    }

    @POST
    @Path("/upload")
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public Response uploadFile(
            @FormDataParam("0") InputStream uploadedInputStream,
            @FormDataParam("0") FormDataContentDisposition fileDetail) throws  IOException {
        if (fileDetail == null) throw new RuntimeException("fileDetails is null");
        String tFile = System.getProperty("java.io.tmpdir");

        String uploadedFileLocation = new File(tFile,fileDetail.getFileName()).getAbsolutePath();
        LOGGER.info(uploadedFileLocation);
        // save it
        writeToFile(uploadedInputStream, uploadedFileLocation);
        String output = "{\"name\": \"" + fileDetail.getFileName() + "\"}";

        return Response.ok(output).build();
    }

    // save uploaded file to new location
    private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) throws IOException {
        int read;
        final int BUFFER_LENGTH = 1024;
        final byte[] buffer = new byte[BUFFER_LENGTH];
        OutputStream out = new FileOutputStream(new File(uploadedFileLocation));
        while ((read = uploadedInputStream.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
        out.flush();
        out.close();
        handleUpload(new File(uploadedFileLocation));
    }

    public abstract void handleUpload(File path);
}

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