Java中对List进行分页

当数据返回多层数据结构，无法实现在数据哭中进行物理分页时，可以自己手写分页的工具类。

public class PageList{
   private Integer pageNo;
   private Integer total,
   private Integer pages;
   @JsonIgnore
   private Integer pageSize;
   private List records;
  
  public PageList(List list,Integer pageNo,Integer pageSize){
	  this.pageNo = pageNo;
	  this.pageSize = pageSize;
	  this.total  list.size();
	  boolean full = total%pageSize == 0;
  if(!full){
	  this.pages = total/pageSize + 1;
  }else{
 	 this.pages = total/pageSize;
  }
	  int fromIndex = 0;
	  int toIndex = 0;
	  fromIndex = pageNo * pageSize - pageSize;
  if(pageNo == 0){
  	throw new ArithmeticException("第0页无法显示");
  }else if(pageNo > pages){
  	list = new ArrayList();
  }else if(pageNo == pages){
  	toIndex = total;
  }else{
  	toIndex = pageNo * pageSize;
  }
  if(list.size() == 0){
  	this.records = list;
  }else{
  	this.records = list.subList(fromIndex,toIndex);
  }
  }
  public Integer getPageNo(){return pageNo;}
  public void setPageNo(Integer pageNo){this.pageNo = pageNo;}
  public Integer getTotal(){return total;}
  public void setTotal(Integer total){this.total = total;}
  public Integer getPages(){return pages;}
  public void setPages(Integer pages){this.pages = pages;}
  public Integer getPageSize(){return pageSize;}
  public void setPageSize(Integer pageSize){this.pageSize = pageSize;}
  public List getRecords(){return records;}
  public void setRecords(List list){this.records = list;}
}