A Practical JSP paging code

There is a page requesting action, the action calls the paging implementation class, and then an enthusiastic user replies to the displayed page:
Str + = "go ";I already tried it. No problem1. The following is a pagination class PageResultSet.Package page. bean; import java. util. *; public class PageResultSet {/***** paging data */private Collection data = null;/***** current page */private int curPage; /*** number of records per page */private int pageSize;/*** number of record lines */private int rowsCount;/*** page number */private int pageCount; public PageResultSet (Collection data) {this. data = data; this. curPage = 1; this. pageSize = 10; this. rowsCount = data. size (); this. pageCount = (Int) Math. ceil (double) rowsCount/pageSize);} public PageResultSet (Collection data, int curPage) {this. data = data; this. curPage = curPage; this. pageSize = 10; this. rowsCount = data. size (); this. pageCount = (int) Math. ceil (double) rowsCount/pageSize);} public PageResultSet (Collection data, int curPage, int pageSize) {this. data = data; this. curPage = curPage; this. pageSize = pageSize; t His. rowsCount = data. size (); this. pageCount = (int) Math. ceil (double) rowsCount/pageSize);}/*** getCurPage: returns the current page number ** @ return int */public int getCurPage () {return curPage ;} /*** getPageSize: return page size ** @ return int */public int getPageSize () {return pageSize;}/*** getRowsCount: total number of returned records ** @ return int */public int getRowsCount () {return rowsCount;}/*** getPageCount: Total number of returned records ** @ re Turn int */public int getPageCount () {return pageCount;}/*** first page ** @ return int */public int first () {return 1 ;} /*** last page ** @ return int */public int last () {return pageCount ;} /*** previous Page ** @ return int */public int previous () {return (curPage-1 <1 )? 1: curPage-1;}/*** next page ** @ return int */public int next () {return (curPage + 1> pageCount )? PageCount: curPage + 1;}/*** first page ** @ return boolean */public boolean isFirst () {return (curPage = 1 )? True: false;}/*** last page ** @ return boolean */public boolean isLast () {return (curPage = pageCount )? True: false;}/*** get the current page data ** @ return Collection */public Collection getData () {Collection curData = null; if (data! = Null) {int start = (curPage-1) * pageSize; int end = 0; if (start + pageSize> rowsCount) end = rowsCount; else end = start + pageSize; arrayList arrayCurData = new ArrayList (); ArrayList arrayData = null; Vector vectorCurData = new Vector (); Vector vectorData = null; boolean isArray = true; if (data instanceof ArrayList) {arrayData = (ArrayList) data; isArray = true;} else if (data instance Of Vector) {vectorData = (Vector) data; isArray = false ;}for (int I = start; I <end; I ++) {if (isArray) {arrayCurData. add (arrayData. get (I);} else {vectorData. add (vectorData. elementAt (I) ;}}if (isArray) {curData = (Collection) arrayCurData ;}else {curData = (Collection) vectorCurData ;}} return curData ;} /*** get toolbar ** @ return String */public String getToolBar (String fileName ){ String temp = ""; if (fileName. indexOf ("? ") =-1) {temp = "? ";}Else {temp =" & ";}string str =" "; return str ;}}2. Here is Action./** Generated by MyEclipse Struts * Template path: templates/java/JavaClass. vtl */package struts. action; import java. util. collection; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import org. apache. struts. action. action; import org. apache. struts. action. actionForm; import org. apache. struts. action. actionForward; import org. apache. struts. action. actionMap Ping; import page. bean. databaseConn; import page. bean. pageResultSet; import page. bean. contactBO; import struts. form. loginForm;/*** MyEclipse Struts * Creation date: 04-02-2008 ** XDoclet definition: * @ struts. action path = "/login" name = "loginForm" input = "/login. jsp "scope =" request "validate =" true "* @ struts. action-forward name = "sss" path = "/index. jsp "*/public class LoginAction extends Action {/** Generated Methods * // *** Method execute * @ param mapping * @ param form * @ param request * @ param response * @ return ActionForward */public ActionForward execute (ActionMapping mapping, actionForm form, HttpServletRequest request, HttpServletResponse response) {LoginForm loginForm = (LoginForm) form; ContactBO userBO = new ContactBO (); // retrieve data (ArrayList or Vector format) from the business processing logic class first to collect data; try {Data = userBO. findContact (DatabaseConn. getConnection (); // obtain the current page curPage and the number of records per page pageSize // int curPage = Integer. parseInt (String) request. getParameter ("cur_page"); int curPage = 1; String cur = request. getParameter ("cur_page"); System. out. println ("--------------:" + cur); if (cur! = Null & cur! = "") {CurPage = new Integer (cur ). intValue () ;}int pageSize = 10; // then generate the PageResultSet object PageResultSet dataList = new PageResultSet (data, curPage, pageSize); request. setAttribute ("usersList", dataList); return mapping. findForward ("sss");} catch (Exception e) {e. printStackTrace (); return mapping. getInputForward ();}}}3. The following page is displayed.<% @ Page language = "java" import = "java. util. *, page. bean. contact, page. bean. pageResultSet "pageEncoding =" gb2312 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> My JSP 'index. jsp 'starting page <% PageResultSet pageResultSet = (PageResultSet) request. getAttribute ("usersList"); ArrayList usersList = (ArrayList) pageResultSet. getData (); for (int I = 0; I <usersList. size (); I ++) {Contact co = (Contact) usersList. get (I); %> <% = Co. getId () %> "> <% = Co. getUsername () %> <% = Co. getMobile () %> <% = Co. getMail () %> <% = Co. getPhone () %> <% = Co. getMem () %> <% = Co. getLastcontact () %> <% }%> <% = PageResultSet. getToolBar ("login. do") %> For more useful JSP paging code articles, please follow the PHP Chinese network!