Spring's @RequestParam with Enum

Spring's @RequestParam with Enum

In a Spring MVC application, you can use the @RequestParam annotation with an Enum to bind a request parameter to an enum constant. This is a convenient way to handle request parameters that represent enum values. Here's how you can do it:

Suppose you have an enum called Color:

public enum Color { RED, GREEN, BLUE }

And you want to bind a request parameter to an enum value in a controller method. Here's an example:

import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; @Controller public class ColorController { @GetMapping("/getColor") @ResponseBody public String getColor( @RequestParam(name = "color") Color color ) { // Now you can use the 'color' enum value in your controller logic switch (color) { case RED: return "You selected RED"; case GREEN: return "You selected GREEN"; case BLUE: return "You selected BLUE"; default: return "Unknown color"; } } }

In this example:

  • We define a controller class ColorController.
  • We create a getColor method that handles GET requests to the /getColor endpoint.
  • We use the @RequestParam annotation to bind the request parameter named "color" to the Color enum.
  • Inside the method, you can use the color variable, which will hold the enum value corresponding to the request parameter.

When you make a GET request like /getColor?color=RED, it will bind the "color" request parameter to the Color.RED enum value. You can then use this enum value in your controller logic.

Remember to configure your Spring MVC application correctly, including setting up the request mapping and other necessary configurations in your Spring configuration or using annotations like @SpringBootApplication and @ComponentScan.

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