How to Retrieve Parameters in a POST Method in Spring MVC?

How can I get parameters from a POST request in Spring MVC?

@PostMapping("/submit")
public String submitForm(@RequestParam("name") String name, Model model) {
    model.addAttribute("name", name);
    return "result";
}

In Spring MVC, retrieving parameters from a POST request is straightforward and can be done using the `@RequestParam` annotation. This allows you to map request parameters to method arguments in your controller.

@PostMapping("/submit")
public String submitForm(@RequestParam("name") String name, @RequestParam("age") int age, Model model) {
    model.addAttribute("name", name);
    model.addAttribute("age", age);
    return "result";
}

Causes

• The parameters may not be included in the request body or URL correctly.
• The method signature may not match the request mapping due to misconfigured annotations.

Solutions

• Use the `@RequestParam` annotation to bind a web request parameter to a method parameter in your controller.
• Ensure that your form or AJAX request is sending the data in the correct format (e.g., application/x-www-form-urlencoded).
• Check that the endpoint matches the URL of your POST request.

Mistake: Not using `@RequestParam` for parameter binding

Solution: Ensure that you annotate method parameters in your controller with `@RequestParam`.

Mistake: Sending parameters in the wrong format

Solution: Check your client's request format; ensure parameters are included in the request body appropriately.