package student_info.commons;
import student_info.model.beans.S_I_Bean;
import java.util.*;
/**
* @作者 李敏强
* Struts分页显示逻辑Bean
*/
public class PageBean {
int currentPage=1; //当前页
public int totalPages=0; //总页数
int pageRecorders=5;//每页5条数据
int totalRows=0; //总数据数
int pageStartRow=0;//每页的起始数
int pageEndRow=0; //每页显示数据的终止数
boolean hasNextPage=false; //是否有下一页
boolean hasPreviousPage=false; //是否有前一页
ArrayList arrayList;
Iterator it;
public PageBean(){}
public PageBean(ArrayList arrayList){
this.arrayList=arrayList;
totalRows=arrayList.size();//bean的个数
it=arrayList.iterator();
hasPreviousPage=false;
currentPage=1;
if((totalRows%pageRecorders)==0)
{
totalPages=totalRows/pageRecorders;
}
else
{
totalPages=totalRows/pageRecorders+1;
}
if(currentPage>=totalPages)
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
if(totalRows<pageRecorders)
{
this.pageStartRow=0;
this.pageEndRow=totalRows;
}
else
{
this.pageStartRow=0;
this.pageEndRow=pageRecorders;
}
}
/**
* @return Returns the currentPage.
*/
public String getCurrentPage() {
return this.toString(currentPage);
}
/**
* @param currentPage The currentPage to set.
*/
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
/**
* @return Returns the pageRecorders.
*/
public int getPageRecorders() {
return pageRecorders;
}
/**
* @param pageRecorders The pageRecorders to set.
*/
public void setPageRecorders(int pageRecorders) {
this.pageRecorders = pageRecorders;
}
/**
* @return Returns the pageEndRow.
*/
public int getPageEndRow() {
return pageEndRow;
}
/**
* @return Returns the pageStartRow.
*/
public int getPageStartRow() {
return pageStartRow;
}
/**
* @return Returns the totalPages.
*/
public String getTotalPages() {
return this.toString(totalPages);
}
/**
* @return Returns the totalRows.
*/
public String getTotalRows() {
return this.toString(totalRows);
}
/**
* @return Returns the hasNextPage.
*/
public boolean isHasNextPage() {
return hasNextPage;
}
/**
* @param hasNextPage The hasNextPage to set.
*/
public void setHasNextPage(boolean hasNextPage) {
this.hasNextPage = hasNextPage;
}
/**
* @return Returns the hasPreviousPage.
*/
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
/**
* @param hasPreviousPage The hasPreviousPage to set.
*/
public void setHasPreviousPage(boolean hasPreviousPage) {
this.hasPreviousPage = hasPreviousPage;
}
public S_I_Bean[] getNextPage(){
currentPage=currentPage+1;
System.out.println("PageBean.getNextPage()正在执行；");
System.out.println("参数currentPage="+currentPage);
if((currentPage-1)>0){
hasPreviousPage=true;
}
else{
hasPreviousPage=false;
}
if(currentPage>=totalPages) {
hasNextPage=false;
}
else{
hasNextPage=true;
}
System.out.println("参数hasNextPage="+hasNextPage);
System.out.println("准备执行PageBean.getAddressBooks()");
S_I_Bean[] sibeans=getS_I_Beans();
this.description();
return sibeans;
}
public S_I_Bean[] getPreviouspage(){
currentPage=currentPage-1;
if(currentPage==0){currentPage=1;}
if(currentPage>=totalPages)
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
if((currentPage-1)>0)
{
hasPreviousPage=true;
}
else
{
hasPreviousPage=false;
}
S_I_Bean[] sibeans=getS_I_Beans();
this.description();
return sibeans;
}
public S_I_Bean[] getS_I_Beans(){
System.out.println("pageBean.getBooks（）开始执行；");
if(currentPage*pageRecorders<totalRows){//判断是否为最后一页
pageEndRow=currentPage*pageRecorders;
pageStartRow=pageEndRow-pageRecorders;
}
else{
pageEndRow=totalRows;
pageStartRow=pageRecorders*(totalPages-1);
}
S_I_Bean[] sibeans=new S_I_Bean[pageEndRow-pageStartRow+1];
System.out.println("pageStartRow="+pageStartRow);
System.out.println("pageEndRow="+pageEndRow);
int j=0;
for(int i=pageStartRow;i<pageEndRow;i++)
{
S_I_Bean sibean=(S_I_Bean)arrayList.get(i);
sibeans[j++]=sibean;
}
System.out.println("要显示的页面数据已经封装,具体信息如下：");
this.description();
return sibeans;
}
public String toString(int temp)
{
String str=Integer.toString(temp);
return str;
}
public void description()
{
String description="共有数据数:"+this.getTotalRows()+
"共有页数: "+this.getTotalPages() +
"当前页数为:"+this.getCurrentPage()+
" 是否有前一页: "+this.isHasPreviousPage() +
" 是否有下一页:"+this.isHasNextPage()+
" 开始行数:"+this.getPageStartRow()+
" 终止行数:"+this.getPageEndRow();
System.out.println(description);
}
}
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