Example usage for com.mongodb.client.gridfs GridFSBucket openDownloadStreamByName

Introduction

In this page you can find the example usage for com.mongodb.client.gridfs GridFSBucket openDownloadStreamByName.

Prototype

@Deprecated
@SuppressWarnings("deprecation")
GridFSDownloadStream openDownloadStreamByName(String filename,
        com.mongodb.client.gridfs.model.GridFSDownloadByNameOptions options);

Source Link

Document

Opens a Stream from which the application can read the contents of the stored file specified by filename and the revision in options .

Usage

From source file:UnitTest3.java

License:Open Source License

public static void testgridfs3() throws FileNotFoundException, IOException {

    long time1;//from   w w w  .ja  v  a2 s  . c o m
    long time2;
    long time3;
    long time4;
    int n = 0;
    // "/home/anees/workspace/testdata/in/App3.class"
    String fileName = "makezip4.rar";

    MongoClient mongo = new MongoClient("localhost", 27017);
    //DB db = mongo.getDB("JFileDB");
    MongoDatabase db = mongo.getDatabase("JFileDB");
    GridFSBucket gridFSBucket = GridFSBuckets.create(db);

    // Get the input stream
    time1 = System.currentTimeMillis();
    InputStream streamToUploadFrom = new FileInputStream("/home/anees/workspace/testdata/in/" + fileName);

    // Create some custom options
    GridFSUploadOptions options = new GridFSUploadOptions().chunkSizeBytes(1024 * 1024)
            .metadata(new Document("type", "class"));

    byte data[] = new byte[64 * 1024 * 1024];
    GridFSUploadStream uploadStream = gridFSBucket.openUploadStream(fileName, options);

    while ((n = streamToUploadFrom.read(data)) > 0) {
        uploadStream.write(data, 0, n);
    }
    uploadStream.close();
    time2 = System.currentTimeMillis();

    time3 = System.currentTimeMillis();
    Date date = new Date();
    FileOutputStream streamToDownloadTo = new FileOutputStream(
            "/home/anees/workspace/testdata/out/" + fileName + "_" + date.toString());
    GridFSDownloadByNameOptions downloadOptions = new GridFSDownloadByNameOptions().revision(-1);

    GridFSDownloadStream downloadStream = gridFSBucket.openDownloadStreamByName(fileName, downloadOptions);
    long fileLength = downloadStream.getGridFSFile().getLength();
    byte[] bytesToWriteTo = new byte[64 * 1024 * 1024];

    while ((n = downloadStream.read(bytesToWriteTo)) > 0) {
        streamToDownloadTo.write(bytesToWriteTo, 0, n);
    }
    downloadStream.close();
    time4 = System.currentTimeMillis();

    System.out.println("The fileId of the uploaded file is: " + uploadStream.getFileId().toHexString());
    System.out.println("Upload time taken : time2 - time1 : " + (time2 - time1));
    System.out.println("Download time taken : time4 - time3 : " + (time4 - time3));

    streamToDownloadTo.close();
    streamToUploadFrom.close();
    mongo.close();
}

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