如何在Comparator类中autowire一个接口

Question

使用springboot，和mongo的repository，我定义了一个Comparator类，想实现自己的对象的比较方法。代码如下： package com.story.utils; import java.util.Comparator; import javax.annotation.Resource; import org.springframework.stereotype.Service; import com.story.model.Phase; import com.story.model.Story; import com.story.repository.StoryRepository; @Service public class PhaseComparator implements Comparator<Phase>{ private String field; private Story story; @Autowired private StoryRepository storyRepository; public PhaseComparator() { super(); } public PhaseComparator (String field) { this.field = field; } @Override public int compare(Phase phase_1, Phase phase_2) { if (this.field.equals("createdDate")) { return phase_1.getCreatedDate() < phase_2.getCreatedDate() ? -1 : 1; } else { Story foundStory_1 = this.storyRepository.findOne(phase_1.getStoryId()); Story foundStory_2 = this.storyRepository.findOne(phase_1.getStoryId()); return foundStory_1.getLastUpdatedDate() < foundStory_2.getLastUpdatedDate() ? -1 : 1; } } } 但是，这样的话，storyRepository就是null。请问应该如何处理呢？谢谢