hibernate+jsp分页第三版

改进了一下分页 不用session和数组来传递动态查询参数

优化了下 join查询的问题

Page.java 和以前一样 接口

package cn.loen.platform.util.page;

import java.util.List;

public interface Page {

public static int PAGE_SIZE = 15;
/**
* 是否是首页（第一页），第一页页码为1
*
* @return 首页标识
*/
public boolean isFirstPage();

/**
* 是否是最后一页
*
* @return 末页标识
*/
public boolean isLastPage();

/**
* 是否有下一页
*
* @return 下一页标识
*/
public boolean hasNextPage();

/**
* 是否有上一页
*
* @return 上一页标识
*/
public boolean hasPreviousPage();

/**
* 获取最后一页页码，也就是总页数
*
* @return 最后一页页码
*/
public int getLastPageNumber();

/**
* 当前页包含的数据
*
* @return 当前页数据源
*/
public List getThisPageElements();

public void setThisPageElements(List ls);

/**
* 总的数据条目数量，0表示没有数据
*
* @return 总数量
*/
public int getTotalNumberOfElements();

/**
* 获取当前页的首条数据的行编码
*
* @return 当前页的首条数据的行编码
*/
public int getThisPageFirstElementNumber();

/**
* 获取当前页的末条数据的行编码
*
* @return 当前页的末条数据的行编码
*/
public int getThisPageLastElementNumber();

/**
* 获取下一页编码
*
* @return 下一页编码
*/
public int getNextPageNumber();

/**
* 获取上一页编码
*
* @return 上一页编码
*/
public int getPreviousPageNumber();

/**
* 每一页显示的条目数
*
* @return 每一页显示的条目数
*/
public int getPageSize();

/**
* 当前页的页码
*
* @return 当前页的页码
*/
public int getThisPageNumber();

}

Page的实现 HibernatePage.java 和以前一样

package cn.loen.platform.util.page;

import java.util.List;

public class HibernatePageimplements Page {

private List elements;

private int pageSize;

private int pageNumber;

private int totalElements;

/**
* 构建HibernatePage对象，完成数据的分页处理
*
* @param elements
* List数据源
* @param totalElements
* 记录总数
* @param pageNumber
* 当前页编码，从1开始，如果传的值为Integer.MAX_VALUE表示获取最后一页。
* 如果你不知道最后一页编码，传Integer.MAX_VALUE即可。如果当前页超过总页数，也表示最后一页。
* 这两种情况将重新更改当前页的页码为最后一页编码。
* @param pageSize
* 每一页显示的条目数
*/
public HibernatePage(List elements, int totalElements, int pageNumber,
int pageSize) {
this.elements = elements;
this.totalElements = totalElements;
this.pageNumber = pageNumber;
this.pageSize = pageSize;
if (this.pageNumber == Integer.MAX_VALUE ||
this.pageNumber > getLastPageNumber()) {
this.pageNumber = getLastPageNumber();
}
}

public boolean isFirstPage() {
return getThisPageNumber() == 1;
}

public boolean isLastPage() {
return getThisPageNumber() >= getLastPageNumber();
}

public boolean hasNextPage() {
return getLastPageNumber() > getThisPageNumber();
}

public boolean hasPreviousPage() {
return getThisPageNumber() > 1;
}

public int getLastPageNumber() {
return totalElements % this.pageSize == 0 ? totalElements
/ this.pageSize : totalElements / this.pageSize + 1;
}

public List getThisPageElements() {
return elements;
}

public int getTotalNumberOfElements() {
return totalElements;
}

public int getThisPageFirstElementNumber() {
return (getThisPageNumber() - 1) * getPageSize() + 1;
}

public int getThisPageLastElementNumber() {
int fullPage = getThisPageFirstElementNumber() + getPageSize() - 1;
return getTotalNumberOfElements() < fullPage ? getTotalNumberOfElements()
: fullPage;
}

public int getNextPageNumber() {
int nextPage = getThisPageNumber() + 1;
return nextPage < getLastPageNumber() ? nextPage : getLastPageNumber();
}

public int getPreviousPageNumber() {
int previousPage = getThisPageNumber() - 1;
return 1 < previousPage ? previousPage : 1;
}

public int getPageSize() {
return pageSize;
}

public int getThisPageNumber() {
return pageNumber;
}

public void setThisPageElements(List ls) {
elements = ls;
}
}

关键 QueryHandler.java 查询处理用于Hibernate查询

SQL查询见 上篇文章

package cn.loen.platform.util.query;

import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Query;
import cn.loen.platform.util.page.HibernatePage;
import cn.loen.platform.util.page.Page;
import cn.loen.platform.common.BaseDAO;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
/**
*
* <p>Title: www.loen.cn</p>
*
* <p>Description: v1.0</p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: loen</p>
*
* @author bright([e-mail])
* @version 1.0
*/
public class QueryHandler {

private static QueryHandler instance = new QueryHandler();

public static QueryHandler instance() {
return instance;
}

private QueryHandler() {
}

/**
* 得到记录总数
* @param hql String
* @param values Object[]
* @return int
* @throws HibernateException
*/
public int getTotalCountS(String hql, Object[] values) throws
HibernateException {
Integer count = new Integer(0);
/**
* 去掉排序
*/
int sql_orderby = hql.indexOf("order by");
if(sql_orderby>0)
hql = hql.substring(0,sql_orderby);
/**
* 去掉条件
*/
hql=(hql.split("from"))[1];
StringBuffer countStr = new StringBuffer("select count(*) from");
countStr.append(hql);
Session session = null;
List list = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(countStr.toString());
for (int i = 0; i < values.length; i++) {
int z = i;
query.setParameter(z=z==0?0:i*2, values[i]);
query.setParameter(z=z==0?1:i*2+1, values[i]);

/*第二版 不用管查询参数是否为null 把所有的查询条件都写到String hql语句中

注意要把所有的查询条件的null转化为' '(空字符串);

例如:String hql = "select * from Table as t where (t.name=? or ' '=?) and (t.country=? or ' '=?)";

*/

}
list = query.list();

if (!list.isEmpty())
count = (Integer) list.get(0);
return count.intValue();

} finally {
session.close();
}
}
/**
* @deprecated
* @param hql String
* @param values Object[]
* @return int
* @throws HibernateException
*/
public int getTotalCount(String hql, Object[] values) throws
HibernateException {
Integer count = new Integer(0);
/**
* 去掉排序
*/
int sql_orderby = hql.indexOf("order by");
if(sql_orderby>0)
hql = hql.substring(0,sql_orderby);
/**
* 去掉条件
*/
hql=(hql.split("from"))[1];
StringBuffer countStr = new StringBuffer("select count(*) from");
countStr.append(hql);
Session session = null;
List list = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(countStr.toString());
for (int i = 0; i < values.length; i++) {
query.setParameter(i, values[i]);//第一版 需要对hql的查询参数进行判断是否存在 如果存在 就在String hql 后面加上" and Value=?"
}
list = query.list();

if (!list.isEmpty())
count = (Integer) list.get(0);
return count.intValue();

} finally {
session.close();
}
}

public int getTotalCountMap(String hql, Map map) throws
HibernateException {
Integer count = new Integer(0);
/**
* 去掉排序
*/
if(StringUtils.contains(hql,"order by"))
hql = StringUtils.substringBefore(hql,"order by");
/**
* 去掉fetch
*/
if(StringUtils.contains(hql,"fetch"))
hql = StringUtils.replace(hql,"fetch","");
/**
* 去掉条件
*/
hql = StringUtils.substringAfter(hql,"from");
StringBuffer countStr = new StringBuffer("select count(*) from");

countStr.append(hql);
Session session = null;
List list = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(countStr.toString());
Set set = map.keySet();
Iterator it = set.iterator();
while(it.hasNext())
{
String key = (String)it.next();
Object value = map.get(key);
query.setParameter(key,value);
}

/*由于第二版有个参数的顺序问题 就是页面传递过来的list或者String[]的顺序必须和hql的查询条件顺序一致 故利用Hibernate的查询改写成map

例如:String hql = "select * from Table as t where (t.name=:name or ' '=:name) and (t.country=:country or ' '=:country)";

页面传递进来只需要传递一个Map map = new Hashmap();

map.put("country",value0);map.put("name",value1);

*/

list = query.list();

if (!list.isEmpty())
count = (Integer) list.get(0);
return count.intValue();

} finally {
session.close();
}
}

/**
* 按页数得到需要记录数
* @param hql String
* @param values Object[]
* @param pageNo int
* @param pageSize int
* @return List
* @throws HibernateException
*/
public List queryS(String hql, Object[] values, int pageNo, int pageSize) throws
HibernateException {
List list = null;
Session session = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(hql);
for (int i = 0; i < values.length; i++) {
int z = i;
query.setParameter(z=z==0?0:i*2, values[i]);
query.setParameter(z=z==0?1:i*2+1, values[i]);
}
query.setFirstResult((pageNo - 1) * pageSize);
query.setMaxResults(pageSize);

return query.list();
} finally {
session.close();
}
}
/**
* @deprecated
* @param hql String
* @param values Object[]
* @param pageNo int
* @param pageSize int
* @return List
* @throws HibernateException
*/
public List query(String hql, Object[] values, int pageNo, int pageSize) throws
HibernateException {
List list = null;
Session session = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(hql);
for (int i = 0; i < values.length; i++) {
int z = i;
query.setParameter(i, values[i]);
}
query.setFirstResult((pageNo - 1) * pageSize);
query.setMaxResults(pageSize);

return query.list();
} finally {
session.close();
}
}

public List queryMap(String hql, Map map, int pageNo, int pageSize) throws
HibernateException {
List list = null;
Session session = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(hql);
Set set = map.keySet();
Iterator it = set.iterator();
while(it.hasNext())
{
String key = (String)it.next();
Object value = map.get(key);
query.setParameter(key,value);
}
query.setFirstResult((pageNo - 1) * pageSize);
query.setMaxResults(pageSize);

return query.list();
} finally {
session.close();
}
}

/**
* 取得全部记录
* @param hql String
* @param values Object[]
* @return List
* @throws HibernateException
*/
public List queryAll(String hql, Object[] values) throws HibernateException {
List list = null;
Session session = null;
try {
session = BaseDAO.getSession();
Query query = session.createQuery(hql);
for (int i = 0; i < values.length; i++) {
query.setParameter(i, values[i]);
}
return query.list();
} finally {
session.close();
}
}

public Page queryByPage(int pageNumber, int pageSize, Object[] values,
String hql) {
Page page = null;
try {
int total = QueryHandler.instance().getTotalCount(hql, values);
List querylist = QueryHandler.instance().query(hql, values,
pageNumber, pageSize);
page = new HibernatePage(querylist, total, pageNumber, pageSize);
} catch (Exception e) {
e.printStackTrace();
}
return page;
}
public Page queryByPageS(int pageNumber, int pageSize, Object[] values,
String hql) {
Page page = null;
try {
int total = QueryHandler.instance().getTotalCountS(hql, values);
List querylist = QueryHandler.instance().queryS(hql, values,
pageNumber, pageSize);
page = new HibernatePage(querylist, total, pageNumber, pageSize);
} catch (Exception e) {
e.printStackTrace();
}
return page;
}

public Page queryByPageMap(int pageNumber, int pageSize, Map map,
String hql) {
Page page = null;
try {
int total = QueryHandler.instance().getTotalCountMap(hql, map);
List querylist = QueryHandler.instance().queryMap(hql, map,
pageNumber, pageSize);
page = new HibernatePage(querylist, total, pageNumber, pageSize);
} catch (Exception e) {
e.printStackTrace();
}
return page;
}
}

Services 调用 XXServices.java

public XXServices{
public Page queryCourseByPage(int pageNum, int pageSize, Map map) throws BusinessException {
String hql = "from Course as c where ((:provincecode='') or (c.provincecode=:provincecode)) and ((:citycode='') or (c.citycode=:citycode)) and ((:recommendernum='') or (c.recommendernum=:recommendernum)) and ((:isdisable='') or (c.isdisable=:isdisable)) and ((:coursename = '') or (c.coursename like '%' || :coursename || '%'))";
map.put("isdisable","Y");
Page page = null;
try {
page = QueryHandler.instance().queryByPageMap(pageNum, pageSize,
map,
hql);
} catch (Exception e) {
e.printStackTrace();
throw new BusinessException(e.getMessage());
}
return page;
}

}

Servlet调用: CourseAction.java

public class CourseAction extends DispatchAction {

public ActionForward list(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws
BusinessException {

CourseActionForm courseForm = (CourseActionForm) form;
String pageNumStr = request.getParameter("pageNumber");

//可以把页树也封装到formBean中,页面放一个隐藏字段存放page
if (pageNumStr == null) {
pageNumStr = "1";
}
pageNumber = Integer.parseInt(pageNumStr);
Map map = new HashMap();
map.put("provincecode",courseForm.getProvincecode());
map.put("citycode",courseForm.getCitycode());
map.put("recommendernum",courseForm.getRecommendernum());
map.put("coursename",courseForm.getCoursename());
Page page = this.getICourseService().queryCourseByPage(pageNumber,pageSize,map);
request.setAttribute("Page",page);
String path = request.getRequestURI();
request.setAttribute("myPageURL", path+"?method=list");
request.setAttribute("formName","courseForm");

//把当前action路径和form的名称传到页面 用于分页跳转

//主要目地是为了分离PageBar.jsp 也就是分页跳转导航条 便于通用
return mapping.findForward("success"); //程序出口 返回到页面
}

private int pageNumber = 1;
private int pageSize = 5;

//取得service实例
private ICourseService getICourseService() {
return (ICourseService) ProxyService.
getBusinessService(
"CourseService");
}

}

页面: courselist.jsp

<html:form action="/golf/admin/course/courseAction.do?method=list" >
<table width="50%" border="0" cellspacing="2" cellpadding="4">
<tr>
<td width="15%"><img src="/golf/img/index_r19_c34.jpg" width="21" height="20" alt="" /></td>
<td width="85%" align="left" class="textb">球场搜索</td>
</tr>
<tr>
<td colspan="2"><label></label>
<select name="countrycode">
<option>国 家</option>
<option value="china">中国</option>
</select>
&nbsp;
<html:select property ="provincecode">
<html:option value="">省 份</html:option>
<% List procines=ProvinceHelper.getProcinces();
for(int i=0;i<procines.size();i++){
Province province=(Province)procines.get(i);
if(province!=null){%>
<html:option value="<%=province.getProvinceCode()%>"><%=province.getProvinceName() %></html:option>
<%}}%>
</html:select>
&nbsp;
<html:select property ="citycode">
<html:option value="">城 市</html:option>
<%List citys=CityHelper.getCitys();
for(int i=0;i<citys.size();i++){
City city=(City)citys.get(i);
if(city!=null){%>
<html:option value="<%=city.getCityCode()%>"><%=city.getCityName() %></html:option>
<%}}%>
</html:select>
&nbsp;
<html:select property="recommendernum">
<html:option value="">推荐位置</html:option>
<html:option value="<%=Course.POST_ON_INDEX%>">不显示</html:option>
<html:option value="<%=Course.POST_ON_INDEX1%>"><%=LoenConstants.LOEN_COURSE_RECOMMENDER_INDEX1%></html:option>
<html:option value="<%=Course.POST_ON_INDEX2%>"><%=Course.POST_ON_INDEX2%></html:option>
<html:option value="<%=Course.POST_ON_INDEX3%>"><%=Course.POST_ON_INDEX3%></html:option>
<html:option value="<%=Course.POST_ON_INDEX4%>"><%=Course.POST_ON_INDEX4%></html:option>
<html:option value="<%=Course.POST_ON_INDEX5%>"><%=LoenConstants.LOEN_COURSE_RECOMMENDER_INDEX5%></html:option>
</html:select>
</td>
</tr>
<tr>
<td colspan="2"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td colspan="2">关键字搜索： </td>
</tr>
<tr>
<td><html:text property="coursename" size="16" /></td>
<td width="210"><img src="/golf/img/index_r21_c37.jpg" width="27" height="27" onclick="courseForm.submit();" alt="" /></td>
</tr>
</table>
</td>
</tr>
</table>
<%
Page datapage = (Page) request.getAttribute("Page");
List dataList = new ArrayList(); //数据
int dataNum = 0;
if (datapage != null) {
dataList = datapage.getThisPageElements();
dataNum = dataList.size();
}

%>
<div><span style="float:right;width:70%;text-align: right ;padding-right:30px">
<a href="/golf/admin/course/courseAction.do?method=add">增加</a>
<a href="#" onclick="javascript:batch_delS(document.forms.courseForm,'球场','/golf/admin/course/courseAction.do?method=del');">删
除</a>
</span></div>
<div id="tableDiv">
<div class="eXtremeTable" >
<table border="0" cellspacing="0" cellpadding="0" class="tableRegion" width="100%" >
<tr>
<td class="tableHeader">球场名</td>
<td class="tableHeader">设计者</td>
<td class="tableHeader">省份</td>
<td class="tableHeader">城市</td>
<td class="tableHeader">洞数</td>
<td class="tableHeader">草坪类型</td>
<td class="tableHeader">地址</td>
<td class="tableHeader">电话</td>
<td class="tableHeader">传真</td>
<td class="tableHeader">推荐</td>
<td class="tableHeader">编辑</td>
<td class="tableHeader">选择</td>
</tr>
<tbody class="tableBody" >
<%
for (int i = 0; i < dataNum; i++) {
Course course = (Course) dataList.get(i);
String trstyle = "class=/"even/" onmouseover=/"this.className='highlight'/" onmouseout=/"this.className='even'/"";
if(i%2==0)trstyle = "class=/"odd/" onmouseover=/"this.className='highlight'/" onmouseout=/"this.className='odd'/"";
%>
<tr <%=trstyle%>>
<td><a href="/golf/admin/course/detailCourse.do?method=review&courseid=<%=course.getCourseid()%>"><%=course.getCoursename()%></a></td>
<td><%=course.getDesigner()%></td>
<td ><%=ProvinceHelper.getProvinceName(course.getProvincecode())%></td>
<td><%=CityHelper.getCityName(course.getCitycode())%></td>
<td><%=course.getHolenumber()%></td>
<td ><%=course.getTypegreens()%></td>
<td><%=course.getAddress()%></td>
<td><%=course.getTel()%></td>
<td ><%=course.getFax()%></td>
<td ><%=course.getRecommendernum()%></td>
<td ><a href="/golf/admin/course/courseAction.do?method=edit&courseid=<%=course.getCourseid()%>">编辑</a></td>
<td>
<input type="checkbox" name="itemlist" value="<%=course.getCourseid()%>" style="border:0px"/>
</td>
</tr>
<%}%>
</tbody>
</table>
</div> </div>
<jsp:include page="/common/pageBar.jsp" flush="false"/>
</html:form>

pageBar.jsp 分页跳转控制 可通用

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.util.*"%>
<%@ page import="cn.loen.platform.util.page.Page"%>

<%

Page myPage = (Page)request.getAttribute("Page");

int lastPageNumber = 0;//总页数
int nextPageNumber = 0;//下页
int pageSize = 0;//每页记录数
int previoutPageNumber = 0;//上页
List orderlist = new ArrayList();//数据
int firstElement = 0;//当前第一条
int lastElement = 0;//当前最后一条
int pageNum = 0;//当前第几页
int totalElement = 0;//总记录数
if (myPage != null){
lastPageNumber = myPage.getLastPageNumber();//总页数
nextPageNumber = myPage.getNextPageNumber();//下页
pageSize = myPage.getPageSize();//每页记录数
previoutPageNumber = myPage.getPreviousPageNumber();//上页
orderlist = myPage.getThisPageElements();//数据
firstElement = myPage.getThisPageFirstElementNumber();//当前第一条
lastElement = myPage.getThisPageLastElementNumber();//当前最后一条
pageNum = myPage.getThisPageNumber();//当前第几页
totalElement = myPage.getTotalNumberOfElements();//总记录数

//这里就是HibernatePage.java与Page.java的用处

//page = new HibernatePage(querylist, total, pageNumber, pageSize); 把list,总数量,当前页数,每页数量 都封装到page中
}

String pageURL = (String)request.getAttribute("myPageURL");
String formName = (String)request.getAttribute("formName");

%>

<table border="0" cellspacing="0" cellpadding="0" width="80%" >
<tr>
<td>共<%=totalElement%>条/每页<%=pageSize%>条 第<%=pageNum%>页/共<%=lastPageNumber%>页</td>
<td>
<div align="right">[<a href="javascript:gotoPage(1)">首页</a>][<a href="javascript:gotoPage(<%=previoutPageNumber%>)">上一页</a>][<a href="javascript:gotoPage(<%=nextPageNumber%>)">下一页</a>][<a href="javascript:gotoPage(<%=lastPageNumber%>)">末页</a>]
转第
<select name="jump" onchange="jumpPage(this)">
<%for (int i = 1; i <= lastPageNumber; i++) {
if (i == pageNum) {%>
<option selected value="<%=i%>"><%=i%></option>
<%}
else{%>
<option value="<%=i%>"><%=i%></option>
<%}
}%>
</select>
页
</div></td>
</tr>
</table>

<SCRIPT LANGUAGE="JavaScript" type="">
function jumpPage(selObj){
document.forms.<%=formName%>.action="<%=pageURL%>&pageNumber="+selObj.options[selObj.selectedIndex].value;
document.forms.<%=formName%>.submit();
}
function gotoPage(pageNumber){
document.forms.<%=formName%>.action="<%=pageURL%>&pageNumber="+pageNumber;
document.forms.<%=formName%>.submit();
}
</SCRIPT>

//分页过程中把form一起提交

注意:在formBean的reset方法中要把查询条件的null转化为" " 或者在Action Servlet中转换

public class CourseActionForm extends ValidatorForm {
private String address;
private String citycode;
private String courseid;
private String coursename;
private String designer;
private String fax;
private String holenumber;
private String provincecode;
private String tel;
private String typegreens;
private String zipcode;
private String remarkxml;
private FormFile smallpicup;
private String smallpic;
private String recommendernum;
public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public void setZipcode(String zipcode) {
this.zipcode = zipcode;
}

public void setTypegreens(String typegreens) {
this.typegreens = typegreens;
}

public void setTel(String tel) {
this.tel = tel;
}

public void setProvincecode(String provincecode) {
this.provincecode = provincecode;
}

public void setHolenumber(String holenumber) {
this.holenumber = holenumber;
}

public void setFax(String fax) {
this.fax = fax;
}

public void setDesigner(String designer) {
this.designer = designer;
}

public void setCoursename(String coursename) {
this.coursename = coursename;
}

public void setCourseid(String courseid) {
this.courseid = courseid;
}

public void setCitycode(String citycode) {
this.citycode = citycode;
}

public void setRemarkxml(String remarkxml) {
this.remarkxml = remarkxml;
}

public void setSmallpicup(FormFile smallpicup) {
this.smallpicup = smallpicup;
}

public void setSmallpic(String smallpic) {
this.smallpic = smallpic;
}

public void setRecommendernum(String recommendernum) {
this.recommendernum = recommendernum;
}

public String getCitycode() {
return citycode;
}

public String getCourseid() {
return courseid;
}

public String getCoursename() {
return coursename;
}

public String getDesigner() {
return designer;
}

public String getFax() {
return fax;
}

public String getHolenumber() {
return holenumber;
}

public String getProvincecode() {
return provincecode;
}

public String getTel() {
return tel;
}

public String getTypegreens() {
return typegreens;
}

public String getZipcode() {
return zipcode;
}

public String getRemarkxml() {
return remarkxml;
}

public FormFile getSmallpicup() {
return smallpicup;
}

public String getSmallpic() {
return smallpic;
}

public String getRecommendernum() {
return recommendernum;
}

public ActionErrors validate(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
String parameter = actionMapping.getParameter();
String paramValue = httpServletRequest.getParameter(parameter);
parameter = httpServletRequest.getParameter("method");
if (paramValue.equals("save") || paramValue.equals("update")) {
ActionErrors errors = super.validate(actionMapping,
httpServletRequest);
return errors;

//如果你希望用户必须输入一个条件才返回相应的记录集 要不就返回null 你可以在这里进行客户端控制
} else {
return null;
}
}

public void reset(ActionMapping actionMapping,
HttpServletRequest servletRequest) {
this.provincecode=this.provincecode==null?"":this.provincecode;
this.citycode=this.citycode==null?"":this.citycode;
this.recommendernum=this.recommendernum==null?"":this.recommendernum;
this.coursename=this.coursename==null?"":this.coursename;

//如果是Integer对象 就转化为0 与struts机制一样 hql也是 :xx=0

//如果你希望用户必须输入一个条件才返回相应的记录集 要不就返回null 你可以在这里进行服务端控制或者servlet控制(servlet控制更有效率)
}
}

以上就是完成的分页例子

大家只需要2个地方自己写 1:hql查询语句 2:Map 的查询参数