Implementation example of SpringBoot backend service redirection

introduction

In SpringBoot development, after the backend service refactors the code, it plans to change the URL address of a functional interface. But I don't want to change the front-end code. At this time, redirection is needed to redirect the original URL request from the front end to the new URL address.

plan

Redirection function using Spring MVC

Can be used in the controllerRedirectViewto implement redirection. For example:

// If you want to return a specific HTTP status code, such as 301 (permanent redirection),//You can use the `@ResponseStatus` annotation on the controller method.@ResponseStatus(HttpStatus.MOVED_PERMANENTLY)
@GetMapping("/oldUrl")
public RedirectView redirectToNewUrl() {
    RedirectView redirectView = new RedirectView();
    ("/newUrl");
    return redirectView;  // This solution does not require any changes to the front-end}



@GetMapping("/oldUrl")
public String redirectToNewUrl() {
    return "redirect:/newUrl"; // This solution requires the front-end to resend request}

In this way, the current request/oldUrlWhen redirected to/newUrl。

Using Spring Boot's path matching function

Can beorConfigure path matching policy in the process so that the old URL can match the new controller method. For example:

-strategy=ant_path_matcher

Then, the same URL pattern can be used on the new controller method, so that the old URL request will be matched to the new controller method.

Using reverse proxy

If the front-end and back-end are deployed on different servers, you can set up a reverse proxy on the front-end server or load balancer to forward the old URL request to the new URL. If you use Nginx as the reverse proxy server, you can add redirect rules in Nginx's configuration file.

server {
    listen 80;
    server_name ;

    location / {
        return 301 $request_uri;
    }
}

Using Spring Cloud Gateway

If Spring Cloud Gateway is used in the microservice architecture, you can configure routing rules at the gateway level to forward old URL requests to the new URL.

Directly call the Controller layer interface

A way to quickly implement the redirect effect is to directly call the method of another Controller in one Controller. However, this approach does not comply with the typical three-tier architecture design specifications. A three-layer architecture usually includes a presentation layer (Controller), a business logic layer (Service) and a data access layer (DAO/Repository). Each layer has its own specific responsibilities to keep the code clear and maintainable. This can be used as a temporary solution.

@RestController
class AController {
	@Resource
	private BController bcontroller
	@GetMapping
	public void test() {
		();
	}
}

at last

Which method to choose depends on the specific requirements and architecture. In my scenario, the redirection of Spring MVC is used. But if a long-term solution is needed, you need to consider front-end synchronous updates to avoid unnecessary redirection overhead. Or use a reverse proxy or Spring Cloud Gateway.

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