从URL的CXF JAX-RS下载资源

Question

I want to send across resource(say a image) from some URL to front-end. The typical way of doing this is to create a File and build the response. Is there any way in which I don't have to create the File in java code and still send the resource to front-end.

Front-end cannot access the URL due to some constraints. Currently the Pseudo code looks like this.

File file = new File(fullPath);
FileUtils.copyURLToFile(url, file);
ResponseBuilder response = Response.ok(modulePDF);

I want to send content of URL to front-end without creating file. Is there any way?

Answer 1

What way did have in mind to actually obtain the file without creating a File object?

Not sure I fully understand the complete requirement, but you don't have to create a File object. You can send out a byte[] , or simply write it to the response output stream by returning StreamingOutput .

@GET
public StreamingOutput getString() {
    return new StreamingOutput(){
        @Override
        public void write(OutputStream out) 
                throws IOException, WebApplicationException {
            // write to the `out` stream
        }
    };
}

For anything more than that, you will have to greatly elaborate on your requirement. The information you've provided, (especially the highlighted line) doesn't quite paint a clear enough problem as to what actual problem is you are facing.