Old
// Version 1 controller
@RestController
@RequestMapping("/api/v1/products")
public class ProductControllerV1 {
@GetMapping("/{id}")
public ProductDtoV1 getProduct(
@PathVariable Long id) {
return service.getV1(id);
}
}
// Version 2 — duplicated structure
@RestController
@RequestMapping("/api/v2/products")
public class ProductControllerV2 {
@GetMapping("/{id}")
public ProductDtoV2 getProduct(
@PathVariable Long id) {
return service.getV2(id);
}
}
Modern
// Configure versioning once
@Configuration
public class WebConfig implements WebMvcConfigurer {
@Override
public void configureApiVersioning(
ApiVersionConfigurer config) {
config.useRequestHeader("X-API-Version");
}
}
// Single controller, version per method
@RestController
@RequestMapping("/api/products")
public class ProductController {
@GetMapping(value = "/{id}", version = "1")
public ProductDtoV1 getV1(@PathVariable Long id) {
return service.getV1(id);
}
@GetMapping(value = "/{id}", version = "2")
public ProductDtoV2 getV2(@PathVariable Long id) {
return service.getV2(id);
}
}
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