Package com. servlet;
Import java. util .*;
Public class pagebean {
Private list arraylist; // stores the total data
// Page information Definition
Private int totalrows = 0; // total data count
Private int pagerecorders = 20; // number of records per page
Private int totalpages = 0; // total number of pages
Private int pagestartrow = 0; // start number of each page
Private int pageendrow = 0; // The number of data termination records displayed on each page
Private int currentpage = 1; // current page
Private Boolean hasnextpage = false; // whether the next page exists
Private Boolean haspreviouspage = false; // whether the previous page exists
Public int getcurrentpage (){
Return currentpage;
}
Public void setcurrentpage (INT currentpage ){
This. currentpage = currentpage;
}
Public Boolean ishasnextpage (){
Return hasnextpage;
}
Public void sethasnextpage (Boolean hasnextpage ){
This. hasnextpage = hasnextpage;
}
Public Boolean ishaspreviouspage (){
Return haspreviouspage;
}
Public void sethaspreviouspage (Boolean haspreviouspage ){
This. haspreviouspage = haspreviouspage;
}
Public int getpageendrow (){
Return pageendrow;
}
Public void setpageendrow (INT pageendrow ){
This. pageendrow = pageendrow;
}
Public int getpagerecorders (){
Return pagerecorders;
}
Public void setpagerecorders (INT pagerecorders ){
This. pagerecorders = pagerecorders;
}
Public int getpagestartrow (){
Return pagestartrow;
}
Public void setpagestartrow (INT pagestartrow ){
This. pagestartrow = pagestartrow;
}
Public int gettotalpages (){
Return totalpages;
}
Public void settotalpages (INT totalpages ){
This. totalpages = totalpages;
}
Public int gettotalrows (){
Return totalrows;
}
Public void settotalrows (INT totalrows ){
This. totalrows = totalrows;
}
Public pagebean (list arraylist, int pagerecorders ){
This. arraylist = arraylist;
This. pagerecorders = pagerecorders;
Totalrows = arraylist. Size (); // obtain the total number of data
// Obtain the total number of pages
If (totalrows % pagerecorders) = 0 ){
Totalpages = totalrows/pagerecorders;
} Else {
Totalpages = totalrows/pagerecorders + 1;
}
Totalpages = (totalpages = 0 )? 1: totalpages;
// Set the start position and end position on the first page
If (totalrows <pagerecorders ){
This. pagestartrow = 0;
This. pageendrow = totalrows;
} Else {
This. pagestartrow = 0;
This. pageendrow = pagerecorders;
}
// Whether the next page exists
If (currentpage> = totalpages ){
Hasnextpage = false;
} Else {
Hasnextpage = true;
}
}
// Go to the page
Public list getpagelist (INT currentpage ){
// The current page is smaller than 1
If (currentpage <= 0 ){
Currentpage = 1;
}
// The current page is larger than the total number of pages
If (currentpage> = totalpages ){
Currentpage = totalpages;
Hasnextpage = false;
} Else {
Hasnextpage = true;
}
// The current page is greater than 1
If (currentpage> 1 ){
Haspreviouspage = true;
} Else {
Haspreviouspage = false;
}
// Determine whether it is the last page
If (currentpage * pagerecorders <totalrows ){
Pageendrow = currentpage * pagerecorders;
Pagestartrow = pageendrow-pagerecorders;
} Else {
Pageendrow = totalrows;
Pagestartrow = pagerecorders * (totalpages-1 );
}
List <Object> pagelist = new arraylist <Object> ();
For (INT I = pagestartrow; I <pageendrow; I ++ ){
Pagelist. Add (arraylist. Get (I ));
}
Return pagelist;
}
}
Myjsp. jsp
<% @ Page C %>
<% @ Page import = "Java. util. *" %>
<% @ Page import = "com. VO. *" %>
<% @ Page import = "com. servlet. pagebean" %>
<JSP: usebean id = "right" Scope = "request" class = "com. Factory. Factory"/>
<HTML>
<Head>
<Title> panda Eye Studio </title>
<LINK rel = "stylesheet" href = "CSS/shop.css" type = "text/CSS">
</Head>
<Body>
<%!
Int currentpage = 1;
Int recorders = 4;
%>
<%
If (request. getparameter ("page") = NULL | request. getparameter ("page") = "")
{
Currentpage = 1;
}
Else
{
Currentpage = integer. parseint (request. getparameter ("page "));
}
List shoplist = right. getshopinstance (). queryall (); // data queried by the database
Pagebean pages = new pagebean (shoplist, recorders); // you can specify the data to be paged and the number of records on each page.
Pages. setcurrentpage (currentpage); // you can specify the current page.
List all = pages. getpagelist (currentpage); // call the data on the current page
Iterator cart = all. iterator (); // Iteration
While (Cart. hasnext () // output data
{
Shopvo bv = (shopvo) cart. Next ();
String name = BV. getgoodsname ();
%>
<% = Name %>
<% }%>
<P>
<! -- Pagination navigation bar -->
<Form name = "form1" method = "Post" Action = "myjsp. jsp">
Total <% = pages. gettotalrows () %> entries <% = recorders %>/page <% = pages. getcurrentpage () %> page/total <% = pages. gettotalpages () %> page
<% IF (pages. getcurrentpage () <= 1) {%>
Homepage
<%} Else {%>
<A href = "myjsp. jsp? Page = 1 "> homepage </a>
<% }%>
<% IF (pages. ishaspreviouspage () {%>
<A href = "myjsp. jsp? Page = currentPage-1 %> "> previous </a>
<%} Else {%>
Previous Page
<% }%>
<% IF (pages. ishasnextpage () {%>
<A href = "myjsp. jsp? Page = <% = currentpage + 1%> "> next page </a>
<%} Else {%>
Next Page
<% }%>
<% IF (pages. getcurrentpage () <pages. gettotalpages () {%>
<A href = "myjsp. jsp? Page = <% = pages. gettotalpages () %> "> last page </a>
<%} Else {%>
Last page
<% }%>
<Select name = "page">
<% For (INT I = 1; I <= pages. gettotalpages (); I ++)
{%>
<Option value = "<% = I %>" <% if (I = pages. getcurrentpage () {out. println ("selected") ;}%><%= I %> </option>
<% }%>
</SELECT>
<Input type = "Submit" name = "Submit" value = "">
</Form>
</P>
</Body>
</Html>
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