How can I return a Zip file from my Java server-side using JAX-RS?

Question

I want to return a zipped file from my server-side java using JAX-RS to the client.

I tried the following code,

@GET
public Response get() throws Exc         


        

Answer 1

You can write the attachment data to StreamingOutput class, which Jersey will read from.

@Path("/report")
@GET
@Produces(MediaType.TEXT_PLAIN)
public Response generateReport() {
    String data = "file contents"; // data can be obtained from an input stream too.
    StreamingOutput streamingOutput = outputStream -> {
        ZipOutputStream zipOut = new ZipOutputStream(new BufferedOutputStream(outputStream));
        ZipEntry zipEntry = new ZipEntry(reportData.getFileName());
        zipOut.putNextEntry(zipEntry);
        zipOut.write(data); // you can set the data from another input stream
        zipOut.closeEntry();
        zipOut.close();
        outputStream.flush();
        outputStream.close();
    };

    return Response.ok(streamingOutput)
            .type(MediaType.TEXT_PLAIN)
            .header("Content-Disposition","attachment; filename=\"file.zip\"")
            .build();
}