CODEWITHSUNDEEP
javajava-stream
JRobi17X
JRobi17X

Reputation: 67

Is it possible to get specific data only from a collection using Java stream?

I have the following code:

 @Override
      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpHeaders httpHeaders = Collections.list(httpServletRequest.getHeaderNames())
          .stream()
          .collect(Collectors.toMap(
            Function.identity(),
            h -> Collections.list(httpServletRequest.getHeaders(h)),
            (oldValue, newValue) -> newValue,
            HttpHeaders::new
          ));
        System.out.println(httpHeaders);
          chain.doFilter(request, response);
      }

It works just fine, but I would only need to get a few specific data, like accept-encoding and accept language. Is it possible to do that somehow?

Upvotes: 0

Views: 244

Answers (1)

b.GHILAS
b.GHILAS

Reputation: 2303

One possible solution for this

List<String> headerNames = Arrays.asList("Accept-Encoding", "Content-Type");
Map<String, String> headers = headerNames.stream()
     .collect(Collectors.toMap(Function.identity(), header -> httpServletRequest.getHeader(header)));

Or if you want to get HttpHeaders as a result

List<String> headers = Arrays.asList("Accept-Encoding", "Content-Type");
HttpHeaders httpHeaders = new HttpHeaders();
headers.forEach(header -> {
    request.getHeaders(header)
             .asIterator()
             .forEachRemaining(value -> httpHeaders.add(header, value));
});

Upvotes: 1

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