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; } }