分页助手类

/**  
 * 分页操作助手类   
 *  
 */  
public class PagedList   
{   
    protected long count; //数据的总数   
    protected int last; //最后一页   
    protected int previous;//上一页   
    protected int index; //当前页   
    protected int next; //下一页   
    protected boolean hasFirst; //是否首页   
    protected boolean hasLast; //是否最后一页   
    protected boolean hasNext; //是否有下一页   
    protected boolean hasPrevious;//是否有上一页   
    protected List pageList;  //页面显示的页码集   
    protected List list;  //数据集   
       
    /**  
       * 构造方法，构建一个分页类  
       *   
       * @param count 数据总数  
       * @param size  每页显示多少  
       * @param index 当前页  
       * @param list  数据集  
       * @return  
      */  
    public PagedList(long count, int size, int index, List list)   
    {   
        this.list = list;   
        this.count=count;   
        this.index=index;   
        if(index < 1)   
            index = 1;   
        if(count % (long)size > 0L)   
            last = (int)(count / (long)size + 1L);   
        else  
            last = (int)(count / (long)size);   
        //如果当前页不是最后一页，   
        hasNext = hasLast = index < last;   
        //如果有下一页   
        if(hasNext)   
            next = index + 1;   
        //如果当前页不是第一页，   
        hasPrevious = hasFirst = index > 1;   
        //如果有上一页   
        if(hasPrevious)   
            previous = index - 1;   
        //页码集   
        pageList = new ArrayList();   
        int start = 0;   
        int stop = 0;   
        if(index <= 5)   
        {   
            start = 1;   
            if(last > 10)   
                stop = 10;   
            else  
                stop = last;   
        } else  
        {   
            start = index - index % 5;   
            if(last > start + 10)   
                stop = start + 10;   
            else  
                stop = last;   
        }   
        for(int i = start; i <= stop; i++)   
            pageList.add(Integer.valueOf(i));   
    }   
  
    public List getList()   
    {   
        return list;   
    }   
  
    public List getPageList()   
    {   
        return pageList;   
    }   
  
    public long getCount()   
    {   
        return count;   
    }   
  
    public int getPrevious()   
    {   
        return previous;   
    }   
  
    public int getNext()   
    {   
        return next;   
    }   
  
    public int getIndex()   
    {   
        return index;   
    }   
  
    public int getLast()   
    {   
        return last;   
    }   
  
    public boolean hasNext()   
    {   
        return hasNext;   
    }   
  
    public boolean hasPrevious()   
    {   
        return hasPrevious;   
    }   
  
    public boolean hasFirst()   
    {   
        return hasFirst;   
    }   
  
    public boolean hasLast()   
    {   
        return hasLast;   
    }   
  
      
}  


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