问如何按条件验证@RequestMapping请求？

EN

@RestController
public class ProductsServlet {
    @GetMapping("/avail/product")
    public Object avail(@Valid ProductDTO product) {
        //should validate id field only
    }       

    @GetMapping("/sell/product")
    public Object sell(@Valid(with = GroupFuture.class) ProductDTO product) {
        //should validate id + from field
    }       
}

public class ProductDTO {
    @NotNull
    @NotBlank
    private String id;

    @Future(groups = GroupFuture.class)
    private Date from;
}