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Self-written pages

Source: Internet
Author: User
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JSP code:


<% @ Page Language = "Java" Import = "Java. util. *" pageencoding = "GBK" %>
<%
String Path = request. getcontextpath ();
String basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/";
%>
<% @ Taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "C" %>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Base href = "<% = basepath %>">

<Title> page </title>
 
<SCRIPT type = "text/JavaScript">
Function Sub (){
VaR size = Document. getelementbyid ("XX"). value;
Window. Location = "<% = PATH %>/userservlet? Size = "+ size;
}
Function (){
VaR P = Document. getelementbyid ("toindex"). value;
Window. Location = "<% = PATH %>/userservlet? P = "+ P;
}
</SCRIPT>
</Head>

<Body>
<A href = "userservlet"> display by page </a>
<Center>
<Table border = "1" cellpadding = "10" cellspacing = "0">
<Tr> <TD> id </TD> <TD> name </TD> </tr>
<C: foreach items = "$ {page. pagedate}" Var = "PG">
<Tr> <TD >$ {pg. ID} </TD> <TD >$ {pg. Username} </TD> </tr>
</C: foreach>
</Table>
$ {Page. pagecount} pages & nbsp; Page $ {page. pagenow} & nbsp; $ {page. pagesize} records are displayed on each page.
<C: If test = "$ {page. pagenow ne 1}">
<A href = "userservlet? P = $ {page. pageNow-1} "> previous page </a>
</C: If>
<C: If test = "$ {page. pagenow ne page. pagecount}">
<A href = "userservlet? P =$ {page. pagenow + 1} "> next page </a>
</C: If>
<Input type = "text" size = "3" id = "XX"/> entries per page
<Input type = "button" value = "go" onclick = "sub ()"/>
Go to the <input type = text id = "toindex" size = 2/> page <input type = "button" value = "go" onclick = "to ()"/>
</Center>
</Body>
</Html>

Servlet code:

Response. setcontenttype ("text/html; charset = GBK ");
Userservice US = new userservice ();
// Current page
String page = request. getparameter ("p ");
If (page = NULL ){
Page = "1 ";
}
Int P = integer. parseint (PAGE );
// The number of records per page
String SZ = request. getparameter ("size ");
If (SZ = NULL ){
SZ = "10 ";
}
Int size = integer. parseint (sz );

Page pages = us. findall (p, size );
Request. setattribute ("page", pages );
Request. getrequestdispatcher ("/index. jsp"). Forward (request, response );

Service Code:

Public page findall (INT pagenow, int size ){
Page page = new page ();
Userdao = new userdao ();

Int begin = (pageNow-1) * size;
Int end = begin + size;
Int COUNT = userdao. pagecount ();
Int pagecount = count % size = 0? Count/size: Count/size + 1;

Page. setpagenow (pagenow );
Page. setpagecount (pagecount );
Page. setpagesize (size );
Page. setpagedate (userdao. findall (begin, end ));
Return page;
}

Dao (JDBC) code:

Public list findall (INT begin, int end ){
List list = new arraylist ();
Conn = dbutil. getconnection ();
Try {
Pst = conn. preparestatement ("select * from (select ID, username, rownum R from userinfo) Where R>? And r <=? ");
Pst. setint (1, begin );
Pst. setint (2, end );
Rs = pst.exe cutequery ();
While (Rs. Next ()){
User user = new user ();
User. setid (Rs. getint ("ID "));
User. setusername (Rs. getstring ("username "));
List. Add (User );
}
} Catch (sqlexception e ){
E. printstacktrace ();
} Finally {
Dbutil. getclose (RS );
Dbutil. getclose (PST );
Dbutil. getclose (conn );
}
Return list;
}
 
Public int pagecount (){
Int I = 0;
Conn = dbutil. getconnection ();
Try {
St = conn. createstatement ();
Rs = st.exe cutequery ("select count (*) from userinfo ");
If (Rs. Next ()){
I = Rs. getint (1 );
}
} Catch (sqlexception e ){
E. printstacktrace ();
} Finally {
Dbutil. getclose (RS );
Dbutil. getclose (PST );
Dbutil. getclose (conn );
}
Return I;
}

Encapsulation class Page code:

Private int pagenow; // current page
Private int pagesize; // number of entries per page
Private int pagecount; // the total number of pages.
Private list pagedate; // data

You can use the constructor to initialize

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

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