Dropwizard file upload - dropwizard

Question

I have to upload a file from my site yet cnt seem to get it working with drop wizard.
Here is the form from my site.
<form enctype="multipart/form-data" method="POST" action="UploadFile">
<input type="file" id="fileUpload" name="file"/>
<input type="hidden" id="fileName" name="fileName"/>
<input type="submit" value="Upload"/>
</form>
How would I go about on the backend to receive the file?
The solution was
#POST
#Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(
#FormDataParam("file") final InputStream fileInputStream,
#FormDataParam("file") final FormDataContentDisposition contentDispositionHeader) {
String filePath = uploadLocation + newFileName;
saveFile(fileInputStream, filePath);
String output = "File can be downloaded from the following location : " + filePath;
return Response.status(200).entity(output).build();
}
private void saveFile(InputStream uploadedInputStream,
String serverLocation) {
try {
OutputStream outputStream = new FileOutputStream(new File(serverLocation));
int read = 0;
byte[] bytes = new byte[1024];
outputStream = new FileOutputStream(new File(serverLocation));
while ((read = uploadedInputStream.read(bytes)) != -1) {
outputStream.write(bytes, 0, read);
}
outputStream.flush();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}

Answer 1

You could do the saving to the server in lesser number of lines using nio
java.nio.file.Path outputPath = FileSystems.getDefault().getPath(<upload-folder-on-server>, fileName);
Files.copy(fileInputStream, outputPath);
Also, if you're using 0.7.0-rc2, you will need this dependency in your pom.xml
<dependency>
<groupId>com.sun.jersey.contribs</groupId>
<artifactId>jersey-multipart</artifactId>
<version>1.18</version>
</dependency>

Answer 2

With Dropwizard 0.9.2 you have to add the dependency:
<dependency>
<groupId>io.dropwizard</groupId>
<artifactId>dropwizard-forms</artifactId>
<version>${dropwizard.version}</version>
<type>pom</type>
</dependency>
as well as register the multipart feature:
environment.jersey().register(MultiPartFeature.class);

Answer 3

Ensure that you add dropwizard-forms dependency to your pom.xml
<dependency>
<groupId>io.dropwizard</groupId>
<artifactId>dropwizard-forms</artifactId>
<version>${dropwizard.version}</version>
<type>pom</type>
</dependency>
Your resource seems good, Anyhow I've uploaded an example project for uploading files with Dropwizard - https://github.com/juanpabloprado/dw-multipart
#POST
#Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(
#FormDataParam("file") InputStream uploadedInputStream,
#FormDataParam("file") FormDataContentDisposition fileDetail) throws MessagingException, IOException {
String uploadedFileLocation = "C:/Users/Juan/Pictures/uploads/" + fileDetail.getFileName();
// save it
writeToFile(uploadedInputStream, uploadedFileLocation);
String output = "File uploaded to : " + uploadedFileLocation;
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();
}