Can I Pass Multiple Variables to a Spring MVC Controller with @RequestBody without a Backing Object?

Passing Multiple Variables in @RequestBody to Spring MVC Controller with Ajax

Question:

Is wrapping parameters in a backing object necessary for passing multiple variables in @RequestBody to a Spring MVC controller with Ajax?

Discussion:

The question stems from a need to pass two strings, "str1" and "str2," as JSON in the @RequestBody. However, the initial approach:

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

requires a JSON structure with each variable explicitly declared:

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

However, it is more convenient to use a backing object, as seen in:

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

which can be used with the following JSON:

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

Answer:

While using a backing object is a viable approach, an alternative solution is to use a Map or ObjectNode to bind directly to the JSON without creating a separate object class.

For a Map:

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

For an ObjectNode:

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

The above is the detailed content of Can I Pass Multiple Variables to a Spring MVC Controller with @RequestBody without a Backing Object?. For more information, please follow other related articles on the PHP Chinese website!