1、定义通用分页model
package cn.com.bank.mmpf.model;
import cn.com.bank.mmpf.util.Constants;
/**
* Created by IntelliJ IDEA.
* User: willsu
* Date: 2005-6-10
* Time: 16:51:22
* To change this template use File | Settings | File Templates.
*/
public class PageControl implements java.io.Serializable{
private int pageno=1; //当前页码
private int pagesize=Constants.PAGE_SIZE_DEFALUT; //每页行数
private int rowcount; //总行数
private int pagecount; //总页数
private boolean useprevious;//前一页是否能用
private boolean usebehind;//后一页是否能用
private boolean usepage=true;//是否分页
public int getPageno() {
return pageno;
}
public void setPageno(int pageno) {
this.pageno = pageno;
}
public int getPagesize() {
return pagesize;
}
public void setPagesize(int pagesize) {
if (pagesize==0){//0-->不分页
usepage=false;
pagecount=1;
pageno=1;
useprevious=false;
usebehind=false;
}
this.pagesize = pagesize;
}
public int getRowcount() {
return rowcount;
}
public void setRowcount(int rowcount) {
this.rowcount = rowcount;
if(usepage){
pagecount=(rowcount % pagesize ==0 )?(rowcount /pagesize ) : ( rowcount / pagesize +1);
useprevious=pageno==1?false:true;
usebehind=pageno==pagecount?false:true;
}
}
public int getPagecount() {
return pagecount;
}
public void setPagecount(int pagecount) {
this.pagecount = pagecount;
}
public boolean isUseprevious() {
return useprevious;
}
public void setUseprevious(boolean useprevious) {
this.useprevious = useprevious;
}
public boolean isUsebehind() {
return usebehind;
}
public void setUsebehind(boolean usebehind) {
this.usebehind = usebehind;
}
public boolean isUsepage() {
return usepage;
}
public void setUsepage(boolean usepage) {
this.usepage = usepage;
}
}
2、hibernate分页实现函数--〉放在底层类中
public class CommonServiceImpl extends HibernateDaoSupport implements CommonService{
。。。
//通用分页处理
public List getListForPage(final String hsql,PageControl pageControl) throws Exception
{
List pagelist=null;
Session session=getSession();
try {
pageControl.setRowcount(getTotalCount(session,hsql)); //更新pagecontrol的各种属性 important
if(pageControl.isUsepage()){ //是否分页
// sql=hsql+ " limit " + (pageNog-1)*page_size + "," +page_size;
// offices= getHibernateTemplate().find(sql);
//被屏蔽掉的是原来的处理
//以下是改过的处理方法
Query query=null;
query=session.createQuery(hsql);
int start=(pageControl.getPageno()-1)*pageControl.getPagesize();
int rowNum=pageControl.getPagesize();
query.setFirstResult(start);
query.setMaxResults(rowNum);
pagelist = query.list();
}else{
pagelist=session.find(hsql);
}
} finally {
session.close();
}
return pagelist;
}
//计算表的总行数
private int getTotalCount(Session session, String hql) throws Exception
{
Integer amount = new Integer(0);
int sql_from = hql.indexOf("from");
int sql_orderby=hql.indexOf("order by");//为了改进
String countStr="";
if(sql_orderby>0)
{
countStr="select count(*) "+hql.substring(sql_from,sql_orderby);
}
else
countStr = "select count(*) "+hql.substring(sql_from);
Query query = session.createQuery(countStr);
if(!query.list().isEmpty()){
amount = (Integer) query.list().get(0);
}
else
return 0;
return amount.intValue();
}
}
3、实际service对象继承commonserviceimpl
public class LogServiceImpl extends CommonServiceImpl implements LogService{
public List getLogByType(Integer logtype, PageControl pageControl) throws Exception{
String hql="from "+Systemlog.class.getName()+" as a where a.baselogtype.id="+logtype+" order by a.opertime desc";
return getListForPage(hql,pageControl);
}
}
4、action实现
public class LogListAction extends BaseAction{
public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) throws Exception
{
String forward =Constants.FORWORD_FIAL;
LogService service = (LogService) getWebApplicationContext().getBean(Constants.LOG_SERVICE);//获得service对象
Object obj=((DynaActionForm) actionForm).get(Constants.PAGE_CONTROL_MODEL);
Object obj1=((DynaActionForm) actionForm).get(Constants.PAGE_FILTER_ID);
Integer filterid=obj1==null?new Integer(1):(Integer)obj1;
PageControl pageControl=obj==null?new PageControl():(PageControl)obj;
try {
List mainlist=service.getLogByType(filterid,pageControl); //调用分页方法得到list
List filterlist=service.loadAll(Baselogtype.class);
((DynaActionForm) actionForm).set(Constants.PAGE_ENTITY_LIST, mainlist);
((DynaActionForm) actionForm).set(Constants.PAGE_FILTER_LIST, filterlist);
((DynaActionForm) actionForm).set(Constants.PAGE_FILTER_ID,filterid);
((DynaActionForm) actionForm).set(Constants.PAGE_CONTROL_MODEL,pageControl);
forward = Constants.FORWORD_SUCCESS;
} catch (Exception e) {
ActionErrors errors = new ActionErrors();
errors.add(ActionErrors.GLOBAL_ERROR, new ActionError(Constants.ERROR_LIST,e.getMessage()));
saveErrors(request, errors);
}
return actionMapping.findForward(forward);
}
}
5、jsp页面
5.1、分页部分代码：
<logic:greaterThan value="0" name="LogListForm" property="pagecontrolmodel.rowcount">
<p align="right" style="font-size:12px">
共<bean:write name="LogListForm" property="pagecontrolmodel.rowcount"/>行
共<bean:write name="LogListForm" property="pagecontrolmodel.pagecount"/>页
每页行数
<html:select name="LogListForm" property="pagecontrolmodel.pagesize" styleClass="DropDownList" style="width:80px" onchange="refresh()">
<html:option value="0">不分页</html:option>
<html:option value="10">10行</html:option>
<html:option value="20">20行</html:option>
<html:option value="30">30行</html:option>
<html:option value="50">50行</html:option>
<html:option value="100">100行</html:option>
</html:select>
<logic:equal value="true" name="LogListForm" property="pagecontrolmodel.usepage">
<logic:equal value="true" name="LogListForm" property="pagecontrolmodel.useprevious">
<a href="javascript:goto(1)">首页</a>
<a href="javascript:goto(<bean:write property="pagecontrolmodel.pageno" name="LogListForm"/>-1)">前一页</a>
</logic:equal>
<logic:equal value="false" name="LogListForm" property="pagecontrolmodel.useprevious">
首页
前一页
</logic:equal>
<logic:equal value="true" name="LogListForm" property="pagecontrolmodel.usebehind">
<a href="javascript:goto(<bean:write property="pagecontrolmodel.pageno" name="LogListForm"/>+1)">后一页</a>
<a href="javascript:goto(<bean:write property="pagecontrolmodel.pagecount" name="LogListForm"/>)">末页</a>
</logic:equal>
<logic:equal value="false" name="LogListForm" property="pagecontrolmodel.usebehind">
后一页
末页
</logic:equal>
跳至<html:text property="pagecontrolmodel.pageno" name="LogListForm" styleClass="TextBox" style="width:20px"/><input type="button" value="go" onclick="check();">
</logic:equal>
</p>
</logic:greaterThan>
5.2、分页实现配套javascript
<script>
function refresh()
{
document.all("LogListForm").submit();
}
function check()
{
var pageno=document.all("pagecontrolmodel.pageno");
if(!isInt(pageno.value)){alert("非法页数");return;}
var ipageno=parseInt(pageno.value);
var imaxno=parseInt(document.all("pagecontrolmodel.pagecount").value);
if(ipageno<1 || ipageno>imaxno){
alert("页数不在允许的范围内！");return;
}
refresh();
}
function goto(pageno){
document.all("pagecontrolmodel.pageno").value=pageno;
check();
}
</script>
