Extract json parameter from request

Question

I am trying to extract json parameters from a request but I couldn't. By getParameter method in servletRequest, I could just get the post parameter. The json parameters don't have any name so by request.getParameter("?") I can't fill the question mark

I mean something like this: Content-Disposition: form-data; { "user_id" : 1, "value" : "Water", "typeCode" : "Searched" } — armin
– armin, Commented Mar 15, 2014 at 20:10
That is part of a header. Retrieve the header and parse out the JSON. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 15, 2014 at 20:11
actually it is in the body of a request. My comment was just a sample. sorry for that — armin
– armin, Commented Mar 15, 2014 at 20:19
So the JSON is in the body? Just read the body (with one of many ways) and parse the JSON. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 15, 2014 at 20:21

Shay Elkayam · Accepted Answer · 2014-03-27 09:42:38Z

3

If you have prepared a java class in the exact structure like the json, do:

@RequestMapping(...)
public mycontrollerfunc(@RequestBody YourJsonClass body){}

If not, and you want the json as a string, do:

@RequestMapping(...)

public mycontrollerfunc(@RequestBody String body){}

EDIT
If you need to extract the request body (which is what you refer to as "Json Parameter") from a method who can't use @RequestBody and only has access to HttpServletRequest, you can do the following:

String jsonFromRequestBody = CharStreams.toString(request.getReader());

In this case, request has to be HttpServletRequest, so you might need to cast it if you're in a Filter, something like:

HttpServletRequest request = (HttpServletRequest) req;

edited Mar 27, 2014 at 9:42

answered Mar 16, 2014 at 0:21

Shay Elkayam

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5 Comments

armin Over a year ago

the problem is that I want to use the request in a filter, not in the controller so I cant use @RequestBody

Shay Elkayam Over a year ago

This doesn't make any sense. To get the json from the request, you must use requestbody

armin Over a year ago

I want to use input validation in a filter so I must to get the json body in a filter. Unfortunately it is not possible to use @RequestBoduy in the filter

Shay Elkayam Over a year ago

@armin: I understand what you need. Take a look at my EDIT on the answer.

armin Over a year ago

I tried to read it by getReader() but the problem was that because more than once spring tried to use it, I got an exception which is said that it cant be used more than one time

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