스프링 HTTP 요청 - 메시지 바디(JSON, TEXT)

텍스트 조회

@Slf4j
@Controller
public class RequestBodyStringController {

    @PostMapping("/request-body-string-v1")
    public void requestBodyString(HttpServletRequest request, HttpServletResponse response) throws IOException {
        
        ServletInputStream inputStream = request.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
        
        log.info("messageBody={}", messageBody);
        response.getWriter().write("ok");
    }
    
    @PostMapping("/request-body-string-v2")
    public void requestBodyStringV2(InputStream inputStream, Writer responseWriter) throw IOException {
        
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharset.UTF_8);
        
        log.info("messageBody={}", messageBody);
        responseWriter.write("ok");
    }
    
    @PostMapping("/request-body-string-v3")
    public HttpEntity<String> requestBodyStringV3(HttpEntity<String> httpEntity) {
        
        String messageBody = httpEntity.getBody();
        
        log.info("messageBody={}", messageBody);
        return new HttpEntity<>("ok");
    }
    
    @ResponseBody
    @PostMapping("/request-body-string-v4")
    public String requestBodyStringV4(@RequestBody String messageBody) {
        
        log.info("messageBody={}", messageBody);
        return "ok";
    }
}

 

InputStream

InputStream을 사용해서 바디 데이터를 직접 읽을 수 있다.

@PostMapping("/request-body-string-v2")
public void requestBodyStringV2(InputStream inputStream, Writer responseWriter) throw IOException {
        
    String messageBody = StreamUtils.copyToString(inputStream, StandardCharset.UTF_8);
        
    log.info("messageBody={}", messageBody);
    responseWriter.write("ok");
}

• InputStream: HTTP 요청 메시지 바디의 내용을 직접 조회
• OutputStream: HTTP 응답 메시지 바디에 직접 결과 출력

 

HttpEntity

@PostMapping("/request-body-string-v3")
public HttpEntity<String> requestBodyStringV3(HttpEntity<String> httpEntity) {
        
    String messageBody = httpEntity.getBody();
        
    log.info("messageBody={}", messageBody);
    return new HttpEntity<>("ok");
}

HttpEntity: HTTP 헤더 및 바디 정보를 조회

 

@RequestBody

@ResponseBody
@PostMapping("/request-body-string-v4")
public String requestBodyStringV4(@RequestBody String messageBody) {
        
    log.info("messageBody={}", messageBody);
    return "ok";
}

@RequestBody: 바디 정보를 조회

@RequestHeader: 헤더 정보를 조회

 

 

JSON 조회

@Data
public class HelloData {
    private Stirng username;
    private int age;
}

@Slf4j
@Controller
public class RequestBodyJsonController {
    
    private ObjectMapper objectMapper = new ObjectMapper();
    
    @PostMapping("/request-body-json-v1")
    public void requestBodyJsonV1(HttpServeltRequest request, HttpServletResponse response) throws IOException {
        
        ServletInputStream inputStream = request.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
        
        HelloData data = objectMapper.readValue(messageBody, HelloData.class);
        log.info("username={}, age={}", data.getUsername(), data.getAge());
        
        response.getWriter().write("ok");
    }
    
    @ResponseBody
    @PostMapping("/request-body-json-v2")
    public String requestBodyJsonV2(@RequestBody String messageBody) throws IOException {
        
        HelloData data = objectMapper.readValue(messageBody, HelloData.class);
        log.info("username={}, age={}", data.getUsername(), data.getAge());
        return "ok";
    }
    
    @ResponseBody
    @PostMapping("/request-body-json-v3")
    public String requestBodyJsonV3(@RequestBody HelloData data) {
        log.info("username={}, age={}", data.getUsername(), data.getAge());
        return "ok";
    }
    
    @ResponseBody
    @PostMapping("/request-body-json-v4")
    public String requestBodyJsonV4(HttpEntity<HelloData> httpEntity) {
        HelloData data = httpEntity.getBody();
        log.info("username={}, age={}", data.getUsername(), data.getAge());
        return "ok";
    }
    
    @ResponseBody
    @PostMapping("/request-body-json-v5")
    public String requestBodyJsonV5(@RequestBody HelloData data) {
        log.info("username={}, age={}", data.getUsername(), data.getAge());
        return data;
    }
}

 

@RequestBody

@ResponseBody
@PostMapping("/request-body-json-v2")
public String requestBodyJsonV2(@RequestBody String messageBody) throws IOException {
        
    HelloData data = objectMapper.readValue(messageBody, HelloData.class);
    
    log.info("username={}, age={}", data.getUsername(), data.getAge());
    return "ok";
}

@RequestBody 애노테이션으로 바디 데이터를 읽고, objectMapper를 통해 자바 객체로 변환한다.

 

@ResponseBody
@PostMapping("/request-body-json-v3")
public String requestBodyJsonV3(@RequestBody HelloData data) {
    log.info("username={}, age={}", data.getUsername(), data.getAge());
    return "ok";
}

String 타입으로 읽고 객체로 변환하는 과정 없이 바로 객체로 변환한다.

 

@ResponseBody
@PostMapping("/request-body-json-v5")
public String requestBodyJsonV5(@RequestBody HelloData data) {
    log.info("username={}, age={}", data.getUsername(), data.getAge());
    return data;
}

 

HttpEntity

@ResponseBody
@PostMapping("/request-body-json-v4")
public String requestBodyJsonV4(HttpEntity<HelloData> httpEntity) {
    HelloData data = httpEntity.getBody();
    log.info("username={}, age={}", data.getUsername(), data.getAge());
    return "ok";
}

 

 

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