JSP Custom Paging Labels

1, the overall structure of the Web project

2. How to build TLD files in eclipse
3. Coding

Package Mytags;import Java.io.ioexception;import Javax.servlet.jsp.jspexception;import Javax.servlet.jsp.tagext.tagsupport;public class Pagertag extends TagSupport {/** * */private static final long serialver Sionuid = -3066943125964706748l;private String URL; form submission Address private int recordcount;//Total number of records private int pageno;//current page number private int pagesize;//page capacity//Label Body method @overridepublic int doStartTag () throws Jspexception {//TODO auto-generated method stub//Total pages int pagecount= (RECORDCOUNT+PAGESIZE-1)/ Pagesize;if (pageno>pagecount) {pageno=pagecount;} if (pageno<0) {pageno=1;} The form and script content submitted to the label body StringBuffer sb=new StringBuffer () sb.append ("<div class=\" pagination\ ">");//When action= "", Indicates that the page is not refreshed, only the contents of the form are updated sb.append ("<form action=\" \ "method=\" post\ "name=\" qpagerform\ "" >\r\n ");// Pass the implicit parameter sb.append of the current page number ("<input type=\" hidden\ "name=\" pageno\ "value="). Append (PageNo). Append (">");//Whether the previous page is displayed "Link if (pageno>1) {sb.append (" <a href=\ "javascript:void (null) \" onclick=\ "Turnoverpage (" + (pageNo-1) + ") \" > "); Sb.append ("Pre"); Sb.append ("</a>");} Displays the "..." before the current page, and other preceding display logic int start=1;if (pageno>4) {start=pageno-1;sb.append ("<a href=\" javascript:void ( NULL) \ "Onclick=\" turnoverpage (1) \ ">"), Sb.append ("1"); Sb.append ("</a>"); Sb.append ("<a href=\" Javascript:void (null) \ "Onclick=\" turnoverpage (2) \ ">") sb.append ("2"); Sb.append ("</a>"); Sb.append ("...") ;} int End=pageno+1;if (end>pagecount) {end=pagecount;} for (int i=start;i<=end;i++) {if (I==pageno) {sb.append ("<span class=\" current\ ">"). Append (PageNo). Append (" </span> ");} Else{sb.append ("<a href=\" javascript:void (null) \ "onclick=\" Turnoverpage ("). Append (i). Append (") \ ">"). Append (i). Append ("</a>");}} Display logic if (end<pagecount-2) {sb.append ("...") after the current page; if (end<pagecount-1) {sb.append ("<a href=\" javascript:void (null) \ "onclick=\" Turnoverpage ("). Append ( pageCount-1). Append (") \" > "). Append (PageCount-1). Append (" </a> ");} if (end<pagecount) {sb.append ("<a href=\" javascript:void (null) \"Onclick=\" Turnoverpage ("). Append (PageCount). Append (") \ ">"). Append (PageCount). Append ("</a>");//display "next page" "Link 2sb.append (" <a href=\ "javascript:void (null) \" onclick=\ "Turnoverpage ("). Append (pageno+1). Append (") \" > ") . Append ("Next"). Append ("</a>");} Sb.append ("</form></div>");//paging script function, main function://(1) Submit the jump page number to Testpagerservlet, update the content of the display//(2) Update the display of the paging label// The script function is implicit and does not display Sb.append ("<script language=\" javascript\ ">\r\n"); Sb.append ("Function turnoverpage (no) {\ r \ n") ;//The script is in the same document as the form, here is the method Sb.append ("var qform=document.qpagerform;\r\n") to get the form, Sb.append ("if (no>"). Append ( PageCount). Append (") {no="). Append (PageCount). Append (";} \ r \ n "); Sb.append (" if (no<1) {no=1;} \ r \ n "), Sb.append (" qform.pageno.value=no;\r\n "). Append (" Qform.action=\ "). Append (URL). Append (" \ ";"); Sb.append ("Qform.submit ();"). Append ("\ r \ n}"); Sb.append ("</script>"); try {pagecontext.getout (). println (Sb.tostring ());} catch ( IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();} return skip_body;} Public void setrecordcount (int num) {recordcount=num;} public void Setpageno (int num) {pageno=num;} public void setpagesize (int num) {pagesize=num;} public void SetUrl (String str) {url=str;}}

Import Java.io.ioexception;import java.util.arraylist;import java.util.list;import javax.servlet.ServletException; Import Javax.servlet.annotation.webservlet;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse;/** * servlet implementation Class Testpagertagservlet */@WebServlet ("/testpagertagservlet") public class Testpagertagservlet extends HttpServlet {    Private static final long serialversionuid = 1L;    private static final int page_size=10;    Private list<string> datas;        /** * @see httpservlet#httpservlet () */public Testpagertagservlet () {super (); TODO auto-generated Constructor stub}/** * @see Httpservlet#doget (httpservletrequest request, HttpServletResponse R esponse) */protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {//TODO auto-generated Method Stubdopost (request, response);} /** * @see HttpservleT#dopost (HttpServletRequest request, httpservletresponse response) */protected void DoPost (HttpServletRequest request , httpservletresponse response) throws Servletexception, IOException {//TODO auto-generated method Stubint pagesize= PAGE _size;request.setattribute ("PageSize", pageSize); int recordcount=datas.size ();//Gets the current page number string no= Request.getparameter ("PageNo"); int pageno=1;if (! "". Equals (NO) && no!=null) {pageno=integer.parseint (no);} Request.setattribute ("RecordCount", RecordCount); Request.setattribute ("PageNo", pageno); int s= (pageNo-1) *pagesize ; int E=s+pagesize;if (e>recordcount) {e=recordcount;} List<string> Subdatas=datas.sublist (S, e); Request.setattribute ("Subdatas", Subdatas); Request.getrequestdispatcher ("pager.jsp"). Forward (request, response);} @Overridepublic void Init () throws Servletexception {//TODO auto-generated method Stub//super.init ();//Generate test data Datas = N EW arraylist<string> (); for (int i=1;i<105;i++) {string str;str= "string" +i;datas.add (str);}}}

Pager.tdl

<pre name= "code" class= "HTML" ><?xml version= "1.0" encoding= "UTF-8"?><taglib> <tlib-version> 0.0</tlib-version> <jsp-version>0.0</jsp-version> <short-name>q</short-name> <!- -Uniform Resource Locator, unique-<uri>http://www.csdn.net/cjc/tags/pagertag</uri> <!--description of the custom label--><tag ><!--Tag name--><name>pager</name><!--the corresponding label processing class fully qualified name--><tag-class>mytags. pagertag</tag-class><!--The type of the label body--><body-content>empty</body-content><!--The description of the current page number property --><attribute><!--Property name--><name>pageno</name><!--whether the property is necessary--><required> true</required><!--whether the property value can dynamically produce--><rtexprvalue>true</rtexprvalue><!--the data type of the property at the time of the JSP runtime --><type>int</type></attribute><!--Description Information for the total number of records property--><attribute><name> recordcount</name><required>true</required><rtexprvalue>true</rtexprvalue><type>int</type></attribute><!--Description of the total page properties--><attribute><name>pagesize </name><required>true</required><rtexprvalue>true</rtexprvalue><type>int </type></attribute><!--Page Labels Description of the URI attribute to jump--><attribute><name>url</name> <required>true</required><rtexprvalue>true</rtexprvalue><type>java.lang.string </type></attribute></tag></taglib>

pager.jsp

<%@ page language= "java" contenttype= "text/html; Charset=iso-8859-1 "pageencoding=" iso-8859-1 "import =" java.util.* "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" ><%@ taglib Uri= "Http://www.csdn.net/cjc/tags/pagertag" prefix= "Q"%>Index.html
<! DOCTYPE html>
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JSP Custom Paging Labels