java对集合的分页工具类

分页返回类

public class Page {
          
   
    private int currentPage;//当前页
    private int pageSize;   //每页条数
    private Object object;  //分页内容
    private int totalCount;//总条数

    public Page() {
          
   
    }
    public Page(int currentPage, int pageSize, Object object, int totalCount) {
          
   
        this.currentPage = currentPage;
        this.pageSize = pageSize;
        this.object = object;
        this.totalCount = totalCount;
    }


    public int getCurrentPage() {
          
   
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
          
   
        this.currentPage = currentPage;
    }

    public int getPageSize() {
          
   
        return pageSize;
    }

    public void setPageSize(int pageSize) {
          
   
        this.pageSize = pageSize;
    }

    public Object getObject() {
          
   
        return object;
    }

    public void setObject(Object object) {
          
   
        this.object = object;
    }

    public int getTotalCount() {
          
   
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
          
   
        this.totalCount = totalCount;
    }

    @Override
    public String toString() {
          
   
        return "Page{" + "currentPage=" + currentPage + ", pageSize=" + pageSize + ", object=" + object + ", totalCount=" + totalCount + };
    }
}

对集合的分页工具类

public class PageHelper {
          
   
    public static Page page(Object object,int currentPage,int pageSize){
          
   
        Page page=new Page();
        List<Object> list=(List<Object>)object;
        List<Object> pageObjects=new ArrayList<>();
        if (list!=null||list.size()>0){
          
   
            int index=currentPage>1?(currentPage-1)*pageSize:0;
            for (int i=0;i<pageSize&&i<list.size()-index;i++){
          
   
                Object o=list.get(i+index);
                pageObjects.add(o);
            }
        }
        page.setCurrentPage(currentPage);
        page.setObject(pageObjects);
        page.setPageSize(pageSize);
        page.setTotalCount(list.size());
        return page;
    }

    public static void main(String[] args) {
          
   
        List<String> list=new ArrayList<>();
        for (int i=0;i<50;i++){
          
   
            list.add(String.valueOf(i));
        }
        System.out.println(page(list,2,10));;
    }
}