Read HttpServletRequest object from Spring Boot controller method

First, remove the @Autowired field. It’s wrong and you’re not using it anyway.

Now you have two choices:

1. Let Spring process the request body for you, by using the @RequestBody annotation:

   @PostMapping(path = "/abc")
   public String createAbc(@RequestBody String requestBody) throws IOException {
       logger.info("Request body: " + requestBody);
       return "abc";
   }
   

2. Process it yourself, i.e. don’t use the @RequestBody annotation:

   @PostMapping(path = "/abc")
   public String createAbc(HttpServletRequest request) throws IOException {
       StringBuilder builder = new StringBuilder();
       try (BufferedReader in = request.getReader()) {
           char[] buf = new char[4096];
           for (int len; (len = in.read(buf)) > 0; )
               builder.append(buf, 0, len);
       }
       String requestBody = builder.toString();
       logger.info("Request body: " + requestBody);
       return "abc";
   }
   

Don’t know why you’d use option 2, but you can if you want.

if you want to take it out easily:

private ObjectMapper objectMapper;

byte[] bytes = request.getInputStream().readAllBytes();

User u = objectMapper.readValue(bytes, User.class);