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<T>{
private Integer pageNo;
private Integer total,
private Integer pages;
@JsonIgnore
private Integer pageSize;
private List<T> records;
public PageList(List<T> 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<T> getRecords(){return records;}
public void setRecords(List<T> list){this.records = list;}
}
