How to Pass Multiple Parameters to a Spring MVC Controller using @RequestBody with Ajax?

Passing Multiple Parameters in @RequestBody to a Spring MVC Controller using Ajax

When attempting to pass multiple parameters to a Spring MVC controller using @RequestBody, many developers encounter the question of whether it's necessary to wrap the parameters in a backing object.

Initial Approach:

Initially, you may try to do the following:

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody String str1, @RequestBody String str2) {}

With a JSON payload like this:

{
    "str1": "test one",
    "str2": "two test"
}

However, you may find that this approach doesn't work as expected.

Wrapper Object Approach:

To overcome this issue, the next approach is to wrap the parameters in a backing object:

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody Holder holder) {}

This requires a JSON payload like this:

{
    "holder": {
        "str1": "test one",
        "str2": "two test"
    }
}

Alternative Options:

Alternatively, you could change the RequestMethod to GET and use @RequestParam in the query string. Another option is to use @PathVariable with either RequestMethod.

Using a Map or ObjectNode:

If wrapping in a backing object is undesirable, you can use a Map or Jackson's ObjectNode to bind multiple parameters in @RequestBody:

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody Map<String, String> json) {
    //json.get("str1") == "test one"
}

Or:

public boolean getTest(@RequestBody ObjectNode json) {
    //json.get("str1").asText() == "test one"
}

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