封装分页查询的工具类utils----PageTool
public class PageTool {
private int currentPage;//当前页码
private int pageSize;//每页显示的条数
private int totalCount;//总记录数(查询数据库)
private int totalPages;//总页数(计算)
private int prePage;//上一页
private int nextPage;//下一页
private int startIndex;//每页第一条记录的起始下标(计算)
public PageTool(int totalCount, String currentPage) {
this.totalCount = totalCount;
initCurrentPage(currentPage);
this.pageSize=3;//页容量自定义，可以修改
initTotalPages();//计算总页数
initPrePage();//上一页
initNextPage();//下一页
initStartIndex();//每页第一条记录的超始下标
}
//给当前页码初始化
private void initCurrentPage(String currentPage) {
if (currentPage==null) {
this.currentPage=1;
}else {
this.currentPage=Integer.valueOf(currentPage);
}
}
//计算总页数
private void initTotalPages() {
this.totalPages=(totalCount%pageSize==0)?(totalCount/pageSize):(totalCount/pageSize+1);
}
//上一页
private void initPrePage() {
if (currentPage==1) {
this.prePage=1;
}else {
this.prePage=currentPage-1;
}
}
//下一页
private void initNextPage() {
if (currentPage==totalPages) {
this.nextPage=totalPages;
}else {
this.nextPage=currentPage+1;
}
}
//每页第一条记录的起始下标
private void initStartIndex() {
this.startIndex=pageSize*(currentPage-1);
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPrePage() {
return prePage;
}
public void setPrePage(int prePage) {
this.prePage = prePage;
}
public int getNextPage() {
return nextPage;
}
public void setNextPage(int nextPage) {
this.nextPage = nextPage;
}
public int getStartIndex() {
return startIndex;
}
public void setStartIndex(int startIndex) {
this.startIndex = startIndex;
}
}
