现在，我实现了自己的Pageable类，如下所示：

import org.springframework.data.domain.Pageable;

import org.springframework.data.domain.Sort;

public class SortedUnpaged implements Pageable {

private final Sort sort;

private SortedUnpaged(Sort sort) {

this.sort = sort;

}

public static SortedUnpaged getInstance(Sort sort) {

return new SortedUnpaged(sort);

}

public boolean isPaged() {

return false;

}

public Pageable previousOrFirst() {

return this;

}

public Pageable next() {

return this;

}

public boolean hasPrevious() {

return false;

}

public Sort getSort() {

return sort;

}

public int getPageSize() {

throw new UnsupportedOperationException();

}

public int getPageNumber() {

throw new UnsupportedOperationException();

}

public long getOffset() {

throw new UnsupportedOperationException();

}

public Pageable first() {

return this;

}

}

并将其放在我的控制器中：

@GetMapping("/{projectId}" + SUBJECTS_PATH)

public ResponseEntity getSubjects(

@RequestParam(name = "size", required = false, defaultValue = "20") Integer size,

@RequestParam(name = "page", required = false, defaultValue = "0") Integer page,

@SortDefault(sort = "name") Sort sort) {

Pageable pageable;

if (size > 0) {

pageable = PageRequest.of(page, size, sort);

}

else {

pageable = SortedUnpaged.getInstance(sort);

}

...

}

但这对于这样的基本要求来说似乎有点太多了，我宁愿不实现自己的Spring接口类。