Upload and read text/csv file in java

Question

I am new to file handling. I want to read the uploaded text or CSV file. The controller loooks like this:

@PostMapping("/{testid}/consumers")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@ResponseStatus(HttpStatus.OK)
public Subscription createConsumer(@PathVariable String cid, @FormParam("file") InputStream inputStream)

And I am reading this in service like this:

public Subscription createSubscription(String campaingid, InputStream file) {

        BufferedReader br = new BufferedReader(new InputStreamReader(file));

        log.debug("Write File--------------------------- ");
        String line = null;
        try {
            while ((line=br.readLine()) != null) {
            log.debug("Line: " + line);
        } catch (IOException ioe) {
            log.error("Exception while reading input " + ioe);
        } 
}

But I am getting null value in 'br' object. What is wrong I am doing here? I am not using jersey framework. I am using spring boot rest.

Answer 1

I got solution for this ! I modify it as follows:

@PostMapping("/{testid}/consumers")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@ResponseStatus(HttpStatus.OK)
public Subscription createConsumer(@PathVariable String cid, @RequestParam("file") MultipartFile file)

And I am reading it as follows:

InputStream inputStream = file.getInputStream();
                BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
                list = br.lines().collect(Collectors.toList());