Struts+hibernate实现分页程序
package com.shisoft.Pager;
public class Pager {
private int totalRows = 0; // 记录总数
private int totalPages = 0; // 总页数
private int pageSize = 10; // 每页显示数据条数，默认为 10 条记录
private int currentPage = 1; // 当前页数
private boolean hasPrevious = false ; // 是否有上一页
private boolean hasNext = false ; // 是否有下一页
public Pager() {
}
/**
* Initialize Pager
*
* @param totalRows
* totalrecord rows
* @param pageSize
* totalrecord is hold by every page
*/
public void init( int totalRows, int pageSize) {
this . totalRows = totalRows;
this . pageSize = pageSize;
totalPages = ((totalRows + pageSize) - 1) / pageSize;
refresh(); // 刷新当前页面信息
}
/**
*
* @return Returns thecurrentPage.
*
*/
public int getCurrentPage() {
return currentPage ;
}
/**
*
* @param currentPagecurrent
* page
*
*/
public void setCurrentPage( int currentPage) {
this . currentPage = currentPage;
refresh();
}
/**
*
* @return Returns thepageSize.
*
*/
public int getPageSize() {
return pageSize ;
}
/**
*
* @param pageSize
* ThepageSize to set.
*
*/
public void setPageSize( int pageSize) {
this . pageSize = pageSize;
refresh();
}
/**
*
* @return Returns thetotalPages.
*
*/
public int getTotalPages() {
return totalPages ;
}
/**
*
* @param totalPages
* ThetotalPages to set.
*
*/
public void setTotalPages( int totalPages) {
this . totalPages = totalPages;
refresh();
}
/**
*
* @return Returns thetotalRows.
*
*/
public int getTotalRows() {
return totalRows ;
}
/**
*
* @param totalRows
* ThetotalRows to set.
*
*/
public void setTotalRows( int totalRows) {
this . totalRows = totalRows;
refresh();
}
// 跳到第一页
public void first() {
currentPage = 1;
this .setHasPrevious( false );
refresh();
}
// 取得上一页（重新设定当前页面即可）
public void previous() {
currentPage --;
refresh();
}
// 取得下一页
public void next() {
if ( currentPage < totalPages ) {
currentPage ++;
}
refresh();
}
public void doAction(String action) {
if (action != null ) {
// 根据传递进来的参数控制页面的前进后退
if (action.equalsIgnoreCase( "previous" )) {
this .previous();
} else if (action.equalsIgnoreCase( "next" )) {
this .next();
} else if (action.equalsIgnoreCase( "first" )) {
this .first();
} else if (action.equalsIgnoreCase( "last" )) {
this .last();
} else {
this .setCurrentPage(Integer.parseInt (action));
}
}
}
// 跳到最后一页
public void last() {
currentPage = totalPages ;
this .setHasNext( false );
refresh();
}
public boolean isHasNext() {
return hasNext ;
}
/**
*
* @param hasNext
* ThehasNext to set.
*
*/
public void setHasNext( boolean hasNext) {
this . hasNext = hasNext;
}
public boolean isHasPrevious() {
return hasPrevious ;
}
/**
*
* @param hasPrevious
* ThehasPrevious to set.
*
*/
public void setHasPrevious( boolean hasPrevious) {
this . hasPrevious = hasPrevious;
}
// 刷新当前页面信息
public void refresh() {
if ( totalPages <= 1) {
hasPrevious = false ;
hasNext = false ;
} else if ( currentPage == 1) {
hasPrevious = false ;
hasNext = true ;
} else if ( currentPage == totalPages ) {
hasPrevious = true ;
hasNext = false ;
} else {
hasPrevious = true ;
hasNext = true ;
}
}
}
分页标签： PagerTag.java
package com.shisoft.Pager;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
/**
* 通用分页标签的处理类
*/
public class PagerTag extends TagSupport {
private String value = "" ;
private String url = "" ;
private String pagerStr = "" ;
JspWriter out = null ;
public int doStartTag() throws JspException {
try {
out = pageContext .getOut();
} catch (Exception e) {
e.printStackTrace();
}
BuildPagerBar();
return SKIP_BODY ;
}
public int doEndTag() {
return EVAL_PAGE ;
}
private void BuildPagerBar() {
Pager pager = (Pager) pageContext .getSession().getAttribute( pagerStr );
StringBuffer toolbar = new StringBuffer();
toolbar
.append( "<table table align=''center'' title='' 通用分页标签 '' width=''100%'' align=''center'' cellpadding=''0'' cellspacing=''0'' style=''FONT-SIZE: 9pt; BORDER-COLLAPSE: collapse''>" );
toolbar.append( "<tr>" );
toolbar.append( "<td width=60% > 共 " );
toolbar.append( new Integer(pager.getTotalRows()).toString());
toolbar.append( " 条记录 第 " );
toolbar.append( new Integer(pager.getCurrentPage()).toString());
toolbar.append( "/" );
toolbar.append( new Integer(pager.getTotalPages()).toString());
toolbar.append( " 页 </td>" );
toolbar.append( "<td align=right width=5%>" );
toolbar.append( "<a href=''" );
toolbar.append( url );
toolbar.append( "?action=first''> 首页 </a>" );
toolbar.append( "</td>" );
toolbar.append( "<td align=''center'' width=''10%''>" );
if (pager.isHasPrevious()) {
toolbar.append( "<a href=''" );
toolbar.append( url );
toolbar.append( "?action=previous''> 上一页 </a>" );
} else {
toolbar.append( " 上一页 " );
}
toolbar.append( "|" );
if (pager.isHasNext()) {
toolbar.append( "<a href=''" );
toolbar.append( url );
toolbar.append( "?action=next''> 下一页 </a>" );
} else {
toolbar.append( " 下一页 " );
}
toolbar.append( "</td>" );
toolbar.append( "<td align=left width=5%>" );
toolbar.append( "<a href=''" );
toolbar.append( url );
toolbar.append( "?action=last''> 末页 </a>" );
toolbar.append( "</td>" );
toolbar.append( " <td align=''center'' width=20%>" );
toolbar.append( "<FORM action=''" + url + "''>" );
toolbar.append( " 跳转到 " + "<input name=''action'' size=''3'' />" );
toolbar.append( "<INPUT type=''submit'' value=''GO''/>" );
toolbar.append( "</FORM>" );
toolbar.append( "</td>" );
toolbar.append( "</tr></table>" );
try {
out .println(toolbar.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
public String getUrl() {
return url ;
}
public void setUrl(String url) {
this . url = url;
}
public String getValue() {
return value ;
}
public void setValue(String value) {
this . value = value;
}
/**
* @return the pagerStr
*/
public String getPagerStr() {
return pagerStr ;
}
/**
* @param pagerStr the pagerStr to set
*/
public void setPagerStr(String pagerStr) {
this . pagerStr = pagerStr;
}
}
分页标签的 tld 文件： mylib.tld
<? xml version = "1.0" encoding = "UTF-8" ?>
<! DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd" >
< taglib >
< tlibversion > 1.0 </ tlibversion >
< jspversion > 1.1 </ jspversion >
< shortname > utiltag </ shortname >
< uri > http://beltino.com/util </ uri >
< tag >
< name > pager </ name >
< tagclass > com.shisoft.Pager.PagerTag </ tagclass >
< bodycontent > empty </ bodycontent >
< attribute >
< name > value </ name >
< required > true </ required >
< rtexprvalue > true </ rtexprvalue >
</ attribute >
< attribute >
< name > url </ name >
< required > true </ required >
< rtexprvalue > true </ rtexprvalue >
</ attribute >
< attribute >
< name > pagerStr </ name >
< required > true </ required >
< rtexprvalue > true </ rtexprvalue >
</ attribute >
</ tag >
</ taglib >
实体 bean ： Bookand.java
package com.shisoft.bean;
/**
* Bookand generated by MyEclipse Persistence Tools
*/
public class Bookand implements java.io.Serializable {
// Fields
private Integer id ;
private String bookname ;
private String author ;
private Double price ;
// Constructors
/** default constructor */
public Bookand() {
}
/** full constructor */
public Bookand(String bookname, String author, Double price) {
this . bookname = bookname;
this . author = author;
this . price = price;
}
// Property accessors
public Integer getId() {
return this . id ;
}
public void setId(Integer id) {
this . id = id;
}
public String getBookname() {
return this . bookname ;
}
public void setBookname(String bookname) {
this . bookname = bookname;
}
public String getAuthor() {
return this . author ;
}
public void setAuthor(String author) {
this . author = author;
}
public Double getPrice() {
return this . price ;
}
public void setPrice(Double price) {
this . price = price;
}
}
实体操作类： dao 文件
package com.shisoft.bean;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.criterion.Example;
/**
* Data access object (DAO) for domain model class Bookand.
*
* @see com.shisoft.bean.Bookand
* @author MyEclipse Persistence Tools
*/
public class BookandDAO extends BaseHibernateDAO {
private static final Log log = LogFactory.getLog (BookandDAO. class );
// property constants
public static final String BOOKNAME = "bookname" ;
public static final String AUTHOR = "author" ;
public static final String PRICE = "price" ;
public void save(Bookand transientInstance) {
log .debug( "saving Bookand instance" );
try {
getSession().save(transientInstance);
log .debug( "save successful" );
} catch (RuntimeException re) {
log .error( "save failed" , re);
throw re;
}
}
public void delete(Bookand persistentInstance) {
log .debug( "deleting Bookand instance" );
try {
getSession().delete(persistentInstance);
log .debug( "delete successful" );
} catch (RuntimeException re) {
log .error( "delete failed" , re);
throw re;
}
}
public Bookand findById(java.lang.Integer id) {
log .debug( "getting Bookand instance with id: " + id);
try {
Bookand instance = (Bookand) getSession().get(
"com.shisoft.bean.Bookand" , id);
return instance;
} catch (RuntimeException re) {
log .error( "get failed" , re);
throw re;
}
}
public List findByExample(Bookand instance) {
log .debug( "finding Bookand instance by example" );
try {
List results = getSession().createCriteria(
"com.shisoft.bean.Bookand" ).add(Example.create (instance))
.list();
log .debug( "find by example successful, result size: "
+ results.size());
return results;
} catch (RuntimeException re) {
log .error( "find by example failed" , re);
throw re;
}
}
public List findByProperty(String propertyName, Object value) {
log .debug( "finding Bookand instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Bookand as model where model."
+ propertyName + "= ?" ;
Query queryObject = getSession().createQuery(queryString);
queryObject.setParameter(0, value);
return queryObject.list();
} catch (RuntimeException re) {
log .error( "find by property name failed" , re);
throw re;
}
}
public List findByBookname(Object bookname) {
return findByProperty( BOOKNAME , bookname);
}
public List findByAuthor(Object author) {
return findByProperty( AUTHOR , author);
}
public List findByPrice(Object price) {
return findByProperty( PRICE , price);
}
public List findAll() {
log .debug( "finding all Bookand instances" );
try {
Session s=getSession();
String queryString = "from Bookand" ;
Query queryObject = s.createQuery(queryString);
List l=queryObject.list();
return l;
} catch (RuntimeException re) {
re.printStackTrace();
log .error( "find all failed" , re);
throw re;
}
}
public List findAllByPage( int firstrows, int pagesize) {
log .debug( "finding all Bookand instances" );
try {
Session s=getSession();
String queryString = "from Bookand" ;
Query queryObject = s.createQuery(queryString);
queryObject.setMaxResults(pagesize);
queryObject.setFirstResult(firstrows);
List l=queryObject.list();
return l;
} catch (RuntimeException re) {
re.printStackTrace();
log .error( "find all failed" , re);
throw re;
}
}
public Bookand merge(Bookand detachedInstance) {
log .debug( "merging Bookand instance" );
try {
Bookand result = (Bookand) getSession().merge(detachedInstance);
log .debug( "merge successful" );
return result;
} catch (RuntimeException re) {
log .error( "merge failed" , re);
throw re;
}
}
public void attachDirty(Bookand instance) {
log .debug( "attaching dirty Bookand instance" );
try {
getSession().saveOrUpdate(instance);
log .debug( "attach successful" );
} catch (RuntimeException re) {
log .error( "attach failed" , re);
throw re;
}
}
public void attachClean(Bookand instance) {
log .debug( "attaching clean Bookand instance" );
try {
getSession().lock(instance, LockMode. NONE );
log .debug( "attach successful" );
} catch (RuntimeException re) {
log .error( "attach failed" , re);
throw re;
}
}
public static void main(String [] args){
BookandDAO dao = new BookandDAO();
System. out .println( "-=----" );
List results = dao.findAll();
System. out .println(results.size());
for ( int i=0;i<results.size();i++) {
Bookand bookand= new Bookand();
System. out .println( "===========" );
System. out .println(bookand.getBookname());
}
}
}
Action 中代码：
package com.shisoft.struts.action;
import java.util.List;
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.ActionMapping;
import com.shisoft.Pager.Pager;
import com.shisoft.bean.BookandDAO;
public class PagerAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response){
Pager pager= null ;
BookandDAO dao = new BookandDAO();
List results = dao.findAll();
try {
if (request.getSession().getAttribute( "pagerstruts" ) == null ) {
pager = new Pager();
int totalRows =results.size();
pager.init(totalRows,3);
} else {
pager = (Pager) request.getSession().getAttribute( "pagerstruts" );
}
if (request.getParameter( "action" ) != null ) {
pager.doAction(request.getParameter( "action" ).toString());
}
List list = dao.findAllByPage((pager.getCurrentPage() - 1)* pager.getPageSize(),pager.getPageSize());
request.getSession().setAttribute( "pagerstruts" ,pager);
request.setAttribute( "list" , list);
} catch (Exception re) {
re.printStackTrace();
}
return mapping.findForward( "success" );
}
}
Jsp 页面：
<%@ page language = "java" import = "java.util.*" pageEncoding = "gb2312" %>
<%@ taglib uri = "http://struts.apache.org/tags-bean" prefix = "bean" %>
<%@ taglib uri = "http://struts.apache.org/tags-html" prefix = "html" %>
<%@ taglib uri = "http://struts.apache.org/tags-logic" prefix = "logic" %>
<%@ taglib uri = "/WEB-INF/mylib.tld" prefix = "pager" %>
< html >
< head >
< title > 分页 </ title >
< meta http-equiv = "pragma" content = "no-cache" >
< meta http-equiv = "cache-control" content = "no-cache" >
< meta http-equiv = "expires" content = "0" >
< meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >
< meta http-equiv = "description" content = "This is my page" >
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</ head >
< body >
< table width = "100%" align = "center" border = "1" cellpadding = "0"
cellspacing = "0" bordercolor = "#ffc46c" >
< tr >
< td align = "center" >
书名
</ td >
< td align = "center" >
作者
</ td >
< td align = "center" >
价钱
</ td >
</ tr >
< logic:iterate id = "u" name = "list" >
< tr >
< td >
< bean:write name = "u" property = "bookname" />
</ td >
< td align = "center" >
< bean:write name = "u" property = "author" />
</ td >
< td align = "center" >
< bean:write name = "u" property = "price" />
</ td >
</ tr >
</ logic:iterate >
< tr >
< td colspan = "3" >
< pager:pager value = "pager" url = "pager.do" pagerStr = "pagerstruts" />
</ td >
</ tr >
</ table >
</ body >
</ html >
Struts 配置文件
<? xml version = "1.0" encoding = "UTF-8" ?>
<! DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd" >
< struts-config >
< form-beans >
< form-bean name = "pagerForm" type = "com.shisoft.struts.form.PagerForm" />
</ form-beans >
< global-exceptions />
< global-forwards >
< forward name = "pager" path = "/pager.do" ></ forward >
</ global-forwards >
< action-mappings >
< action path = "/pager"
type = "com.shisoft.struts.action.PagerAction"
scope = "request" >
< forward name = "success"
path = "/ok.jsp" ></ forward >
</ action >
</ action-mappings >
< message-resources parameter = "com.shisoft.struts.ApplicationResources" />
</ struts-config >
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