package entity;public class Page { //记录当前页的状态信息private int num; //当前页号，采用自然数计数 1,2,3,...private int size; //一页显示多少个数据private int rowCount; //记录的总数目（一共有多少个数据）private int pageCount; //页面总数（n页）private int startRow; //当前页开始行号，第一行是0行 private int first=1; //第一页 页号private int last; //最后页 页号private int next; //下一页 页号private int prev; //前一页 页号private int start; // 页号式导航, 起始页号private int end; // 页号式导航, 结束页号private int numCount = 4; // 页号式导航, 最多显示页号数量为numCount+1;这里显示5页。public Page(int size, String str_num, int rowCount) {int num = 1;if (str_num != null) { //str_num，起始记录号num = Integer.parseInt(str_num);}this.num = num;this.size = size;this.rowCount = rowCount;this.pageCount = (int) Math.ceil((double) rowCount / size); //**获取页数的总数,ceil是进1取整this.num = Math.min(this.num, pageCount); //当前页号最大值为pageCountthis.num = Math.max(1, this.num); //当前页号最小值为1this.startRow = (this.num-1) * size; //开始行号为 0行this.last = this.pageCount; //最后一页页号为pageCountthis.next = Math.min(this.pageCount, this.num+1); //最后一页为pageCount或者为当前页+1this.prev = Math.max(1, this.num-1); //最前一页为1或者为当前页-1// 计算page 控制//当点击7的时候只出现5到9，当点击8的时候，只出现6到10//若是出现1-5或者6-10，则可改为:if((this.num+1)%(numCount+1)==0){//start=(this.num+1)%(numCount+1)-1*(numCount+1)+1;}//else{ start=this.num/(numCount+1)*(numCount+1)+1;}//比如15和14//本页显示页号从多少页开始，eg:7-4/2=5(第七页就是从第五页开始)start = Math.max(this.num - numCount/2, first); //本页显示页号在多少页号结束 eg:5+4=9（若本页是第七页，则本页开始页为5，结束页为9，每页显示5个）end = Math.min(start + numCount, last); if (end - start < numCount) { //如果记录数小于4start = Math.max(end - numCount, 1); //开始页为1和结束页号-记录数的最大值}}public int getNum() {return num;}public void setNum(int num) {this.num = num;}public int getSize() {return size;}public void setSize(int size) {this.size = size;}public int getRowCount() {return rowCount;}public void setRowCount(int rowCount) {this.rowCount = rowCount;}public int getPageCount() {return pageCount;}public void setPageCount(int pageCount) {this.pageCount = pageCount;}public int getStartRow() {return startRow;}public void setStartRow(int startRow) {this.startRow = startRow;}public int getFirst() {return first;}public void setFirst(int first) {this.first = first;}public int getLast() {return last;}public void setLast(int last) {this.last = last;}public int getNext() {return next;}public void setNext(int next) {this.next = next;}public int getPrev() {return prev;}public void setPrev(int prev) {this.prev = prev;}public int getStart() {return start;}public void setStart(int start) {this.start = start;}public int getEnd() {return end;}public void setEnd(int end) {this.end = end;}public int getNumCount() {return numCount;}public void setNumCount(int numCount) {this.numCount = numCount;}}