서블릿

HttpServletRequest

HttpservletRequest 받기

@WebServlet(name = "requestHeaderServlet", urlPatterns = "/request-header")
public class RequestHandler extends HttpServlet {

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        printStartLine(request);
        printHeaders(request);
    }

    private void printStartLine(HttpServletRequest request){
        System.out.println("request.getMethod() = " + request.getMethod());
        System.out.println("request.getProtocol() = " + request.getProtocol());
    }

    private void printHeaders(HttpServletRequest request){
        System.out.println("---header start---");
        request.getHeaderNames().asIterator()
                .forEachRemaining(headerName -> System.out.println(headerName + ": " + headerName));
        System.out.println("--- Headers - end ---");
        System.out.println();
    }
}

• request.InputStream으로 바디를 받을 수 있다.

HttpservletRequest 받아서 json 파싱후 확인

@WebServlet(name = "requestBodyJsonServlet", urlPatterns = "/request-body-json")
public class RequestBodyJsonServlet extends HttpServlet {

    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletInputStream inputStream = req.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);

        System.out.println("messageBody = " + messageBody);
        HelloData helloData = objectMapper.readValue(messageBody, HelloData.class);

        System.out.println("helloData.getUsername() = " + helloData.getUsername());
        System.out.println("helloData.getAge() = " + helloData.getAge());

        resp.getWriter().write("ok");
    }
}

• ObjectMapper를 통해 key&value형태의json string을 받을 수 있다.