API 메세지 바디 - 단순 텍스트

@WebServlet(name = "requestBodyStringServlet",urlPatterns = "/request-body-string")
public class RequestBodyStringServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        ServletInputStream inputStream = request.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
        System.out.println("messageBody = " + messageBody);
        response.getWriter().write("ok");
    }
}

API 메세지 바디 JSON

@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.username "+helloData.getUsername());
        System.out.println("helloData.age "+helloData.getAge());
        resp.getWriter().write("ok");
    }
}

messageBody = {"username":"hello!","age":20}
helloData.username hello!
helloData.age 20