How to Map Multiple Parameter Values in a Single @RequestMapping in Spring MVC

How do I map different values for a parameter in the same @RequestMapping in Spring MVC?

@RequestMapping(value = "/example", method = RequestMethod.GET)\npublic String example(@RequestParam("type") String type) {\n    // Your logic here based on 'type'\n}

In Spring MVC, you can map different values for a single parameter within a single `@RequestMapping` annotation to handle various scenarios, such as distinguishing between different request types or categories more efficiently. This is often achieved using request parameters, path variables, or query parameters and can be tailored to meet specific application needs.

@RequestMapping(value = "/items", method = RequestMethod.GET)\npublic String getItems(@RequestParam("category") String category) {\n    if (category.equalsIgnoreCase("books")) {\n        return "Returning books";\n    } else if (category.equalsIgnoreCase("electronics")) {\n        return "Returning electronics";\n    }\n    return "Category not found";\n}

Causes

• Using complex values that need specific handling in the controller method.
• Requirement to consolidate multiple endpoint mappings into a single method for better organization.

Solutions

• Utilize the `@RequestParam` annotation to define parameters in your method signature.
• Leverage the `requestMapping` to define a base endpoint and differentiate it using parameters or path variables.
• Implement conditional logic inside your controller method to handle different parameter values.

Mistake: Forgetting to specify request methods, leading to unexpected behavior.

Solution: Always define the HTTP method in the @RequestMapping.

Mistake: Not handling the case when no parameters are provided, resulting in errors.

Solution: Provide default values or error handling for missing parameters.