Receive parameters in Rest controller from Post method using Spring and Ajax

Question

I'm trying to send two parameters using AJAX to my Spring REST controller using the POST method. However those parameters are appearing as null in my controller. Please find the code and let me know if I'm missing anything.

var formData = {
  txToClose: '1234,5678,98549',
  sno:  '0195'
};

$.ajax({
  type: 'post',
  url: url,
  async: false,  
  data: JSON.stringify(formData),
  contentType: "application/json",
  dataType: "json",      
  success: function(result, status, xhr) {
    console.log(result);
  }                           
});

@PostMapping("/txToClose")  
public ResultDto txToClose(HttpServletRequest request, HttpServletResponse response) throws BBException
{
  logger.info("Called txToClose controller");
  ResultDto resultDto = new ResultDto();

  String txToClose = request.getParameter("txToClose");
  String sno = request.getParameter("sno");

  logger.info("Transactions to close :" + txToClose + ", Serial Num :" + sno);
}

Aside from the issue, you should really remove `async: false`. It's horrendous practice — Rory McCrossan, Oct 12 '17 at 08:14
@RoryMcCrossan, any idea on why those parameters are not received? — Yakhoob, Oct 12 '17 at 08:16
Is the control coming under the controller??? See from ur logs — Mohit, Oct 12 '17 at 08:30
@Mohit, its coming, Im printing those values right? It means the control is available in controller — Yakhoob, Oct 12 '17 at 08:31
try printing the request uri using the getRequestURI() function' — Mohit, Oct 12 '17 at 08:40
also try giving the full url in the url parameter in the ajax call to e.g. localhost:8080/txToClose — Mohit, Oct 12 '17 at 08:42
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/156535/discussion-between-yakhoob-and-mohit). — Yakhoob, Oct 12 '17 at 08:49

score 0 · Answer 1 · answered Oct 12 '17 at 08:23

0

create class like this :

    class Myclass{
          private String  txToClose;
             private String    sno; 
 // getters setters
    }

and in your method like this :

@PostMapping("/txToClose")  
public ResultDto txToClose(@RequestBody Myclass class ) throws BBException
{
   // your logic
}

answered Oct 12 '17 at 08:23

hicham abdedaime

346
2
15

but other than creating class, why cannot I receive by using request.getparameter ? – Yakhoob Oct 12 '17 at 08:25
I tried in your way, but still its not working. @Requestbody has 415 unsupported media type, so I used ModelAttribute, but still null values are passing – Yakhoob Oct 12 '17 at 08:30
sincerely i never used request.getParameter() to get param json in spring ,but you can see this https://stackoverflow.com/questions/34781980/read-json-in-java-servlet/34782168 – hicham abdedaime Oct 12 '17 at 08:34
adding content type to your request application/json – hicham abdedaime Oct 12 '17 at 08:36
public boolean txToClose(@RequestBody ObjectNode json) { } This worked – Yakhoob Oct 12 '17 at 08:56

score 0 · Answer 2 · answered Oct 12 '17 at 09:33

0

I think the part which is not working in your code is the request.getParameter() as it would not be able to identify the paramters and values in case of json data. Instead use something like this:

StringBuilder sb = new StringBuilder();
BufferedReader reader = request.getReader();
try {
      String line;
      while ((line = reader.readLine()) != null) {
          sb.append(line).append('\n');
      }
 } 
 finally {
        reader.close();
 }
 System.out.println(sb.toString());

Use the above logic in your controller to process the json request.Please refer this link for further ideas to process json when taken as HttpServeletRequest.

answered Oct 12 '17 at 09:33

Mohit

608
4
19

Mohit.. I solved the issue. public ResultDto txToClose(HttpServletRequest request, HttpServletResponse response,@RequestBody ObjectNode json) throws BBException { logger.info("Called txToClosecontroller"); ResultDto result = new ResultDto(); String txToClose= json.get("txToClose").asText(); } – Yakhoob Oct 12 '17 at 09:35
You used an entity to take the request then right?? – Mohit Oct 12 '17 at 09:36
It could have been possible without the @RequestBody as well, do try my method once to see whether it works or not. Just for testing purpose, if you can. – Mohit Oct 12 '17 at 09:38

score 0 · Answer 3 · answered Nov 27 '17 at 11:28

Solved by using

public ResultDto txToClose(HttpServletRequest request, HttpServletResponse response,@RequestBody ObjectNode json) throws BBException { 
    logger.info("Called txToClosecontroller"); 
    ResultDto result = new ResultDto(); 
    String txToClose= json.get("txToClose").asText(); 
}

Receive parameters in Rest controller from Post method using Spring and Ajax

3 Answers3