java利用递归调用实现树形菜单的样式

 import java.util.Date;
 import java.util.List;
 
 import com.fasterxml.jackson.annotation.JsonFormat;
 
 import lombok.Data;
 @Data
 public class BsChannelPostReply {
 private long replyId;
 private String niceName;
 @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8") 
 private Date replyDate;
 private String content;
 private long directRepliedId;//回复的直接评论的replyId
 private List<BsChannelPostReply> children;//下面的子评论
 }

 @Override
 @Datasource(value="community")//切换数据源
 public List<BsChannelPostReply> getMainReply(int postId) {
  // TODO Auto-generated method stub
  List<BsChannelPostReply> listMain=dao.getMainReply(postId);//获取主评论
  if(listMain.size()>=0){//如果主评论不为空
  for (BsChannelPostReply bsChannelPostReply : listMain) {
   bsChannelPostReply.setChildren(getMainReplyChildren(bsChannelPostReply.getReplyId()));//加载子评论
  }
  }
  return listMain;
 }
 
 @Override
 @Datasource(value="community")//切换数据源
 public List<BsChannelPostReply> getMainReplyChildren(long replyId) {
  // TODO Auto-generated method stub
  List<BsChannelPostReply> listChildren=dao.getMainReplyChildren(replyId);//根据当前的replayId获取当前级子评论列表
  if(listChildren.size()>=0){
  for (BsChannelPostReply bsChannelPostReply : listChildren) {
   bsChannelPostReply.setChildren(getMainReplyChildren(bsChannelPostReply.getReplyId()));//在判断当前子评论是否还有子评论，递归调用，直到没有子评论
  }
  }
  return listChildren;
 }