Can You Pass Multiple Variables in a Request Body to a Spring MVC Controller Using Ajax?

Passing Multiple Variables in @RequestBody to a Spring MVC Controller Using Ajax

When attempting to pass multiple variables in a request body to a Spring MVC controller using Ajax, you may face the question of whether it is necessary to enclose the variables within a backing object.

The original query expressed a desire to achieve this using the following approach:

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

With JSON data resembling:

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

However, the author faced the need to use a holder object instead:

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

And accompanying JSON:

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

The dilemma lies in the fact that @RequestBody requires mapping to a single object, making the use of multiple parameters in the request body challenging.

While the aforementioned workaround involving a holder object is a valid solution, an alternative approach is available using a Map object:

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

This method provides a flexible way to handle multiple variables passed in the request body, allowing access to them via map keys.

Additionally, if you prefer to bind to Jackson's ObjectNode to work with a full JSON tree, you can utilize the following:

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

These alternatives empower you with multiple options for handling multiple variables in a request body, giving you the flexibility to choose the approach that best suits your specific needs.

The above is the detailed content of Can You Pass Multiple Variables in a Request Body to a Spring MVC Controller Using Ajax?. For more information, please follow other related articles on the PHP Chinese website!