HTTP 요청 데이터 – API 메시지 바디(JSON)

강의 chap2-9

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HTTP 요청 데이터 – API 메시지 바디(JSON)

1. JSON 형식 전송

• Content-type : application/json
• Message body : {"username": "hello", "age": 20}

2. 코드

@WebServlet(name = "requestBodyJsonServlet", urlPatterns = "/request-body-json")
public class RequestBodyJsonServlet 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);
    }
}

3. Jackson 라이브러리 사용

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

    private ObjectMapper objectMapper = new ObjectMapper();

    @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);

        HelloData helloData = objectMapper.readValue(messageBody, HelloData.class);
        System.out.println("helloData.username = " + helloData.getUsername());
        System.out.println("helloData.age = " + helloData.getAge());
    }
}

• Objectmapper를 통해 JSON으로 객체 변환이 가능하다.

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출처

인프런 강의 - 김영한
스프링 MVC 1편 - 백엔드 웹 개발 핵심 기술
https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-mvc-1/dashboard