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Hello guys, If you are preparing for Java and Spring Interview, then you must prepare for questions like the difference between X and Y, like the difference between RequestParam and PathVariable annotation; they are pretty popular on both phones on face-to-face interviews and they also help you to learn underlying concepts better.
Earlier, we have seen the difference between Contorller and RestController annotation, @Bean vs. @Component annotation, and @Controller vs. @Service and @Repository and now, I will explain the difference between PathVariable and RequestParam annotations in Spring Framework.
While they may seem similar, there are essential differences between these two annotations that developers need to understand to use them effectively.
For example, @RequestParam is used to capture query parameters or form parameters from the URL, while @PathVariable it is used to capture values from the URL path. They also have different syntax, usage, and behavior in handling URL parameters in Spring MVC applications.
In Spring MVC, @RequestParam is an annotation used to bind request parameters from a URL or a form submission to method parameters in a Spring MVC controller?
Here’s an example of using @RequestParam in a Spring MVC controller method:
@RequestMapping("/user")
public String getUser(@RequestParam("id") int userId) {
// Logic to fetch user details by userId
// ...
return "user";
}In the above example, the @RequestParam annotation is used to bind the “id” query parameter from the URL to the “userId” method parameter.
The value of the “id” parameter will be automatically passed to the “userId” parameter in the controller method, allowing developers to retrieve and use it in their business logic.
For example, if the URL for this endpoint is. “/user?id=123”, the value 123 will be bound to the “userId” the the the parameter in the controller method. This is quite convenient for a backend developer who needs to save this data or pass it to another Microservice.
The @PathVariable annotation in Spring MVC is used to capture and bind a value from a URL path segment to a method parameter in a controller method. It allows you to extract dynamic values from the URL path and use them in your controller logic.
Here’s an example:
