分页处理方法介绍
第一种是没有参数的查询分页处理
后台代码如下：
前台代码如下
另一种情况是在查询时有参数的分页处理
本人使用的是Hibernate+struts+Map技术来处理带N个参数的查询
利用struts里面的<html:link name="map" paramId="参数名" paramName="变量名" paramProperty="变量属性"></html:link>
通过这个可以传递N个参数，
基础类如下：
映射文件如下
Action类如下：
前台页面 list.jsp
分页处理工具：
本人也是菜鸟希望多多指教，或有什么好的见解，完全可以发表评论。
后台代码如下：
public ActionForward execute(ActionMapping mapping ,ActionForm actionForm,HttpServletRequest request,HttpServletResponse response)throws Exception {
int pageSize = 3; //定义每页显示记录数量
int currentPage; //定义当前页
String pageNoStr =request.getParameter("page"); //获取当前页码
if(pageNoStr == null || pageNoStr.trim().equals("")){
currentPage = 1;
}
try{
currentPage = Integer.parseInt(pageNoStr.trim());
}
catch(Exception e){
currentPage = 1;
}
List<Yctsjl> list = yctsjlService.findByParameter(currentPage,pageSize); //业务逻辑 ，实现分页
int count = yctsjlService.getCount(bdzmc, beginDate, endDate); //总的记录条数
int pageCount =yctsjlService.getPageCount(count,pageSize);//获取总页数
request.setAttribute("yctsjlList", list);
request.setAttribute("currentPage",currentPage);
request.setAttribute("count",count);
request.setAttribute("pageCount" ,pageCount);
return mapping.findForward("list");
}
前台代码如下
list.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录页面</title>
<link rel="stylesheet" href="<%=request.getContextPath() %>/css/base1.css" type="text/css" >
</head>
<body>
<br>
<table width="470" align="center">
<tr align="center" class="style6">
<td>
总共<font color="red"><bean:write name="count"/></font>条记录
第<font color="red"><bean:write name="currentPage" /></font>页
共<font color="red"><bean:write name="pageCount" /></font>页
</td>
<% if(((Integer)request.getAttribute("pageCount")==1)||((Integer)request.getAttribute("currentPage")==1)){%>
<td align="center" >首页</td>
<td valign="top"><br></td>
<td valign="top"><br></td><td align="center">上一页</td>
<%}else{ %>
<td align="center">
<a href="<%=request.getContextPath() %>/jsp/xtwh/list.do?action=listUser&page=1">首页</a>
</td>
<td valign="top"><br></td>
<td valign="top"><br></td>
<td align="center">
<a href="<%=request.getContextPath() %>/jsp/xtwh/list.do?action=listUser&page=<%=(Integer)request.getAttribute("currentPage")-1 %>">上一页</a>
</td>
<%} %>
<% if((Integer)request.getAttribute("pagesNum")==1||((Integer)request.getAttribute("currentPage")>=(Integer)request.getAttribute("countPage"))){%>
<td align="center">下一页</td>
<td valign="top"><br></td><td valign="top"><br></td>
<td align="center">尾页</td>
<%}else{ %>
<td align="center">
<a href="<%=request.getContextPath() %>/jsp/xtwh/list.do?page=<%=(Integer)request.getAttribute("currentPage")+1%>">下一页</a>
</td>
<td align="center">
<a href="<%=request.getContextPath() %>/jsp/xtwh/list.do?pageNum=<%=(Integer)request.getAttribute("pagesNum") %>">尾页</a>
</td>
<%} %>
<tr>
</table>
</body>
</html>
另一种情况是在查询时有参数的分页处理
本人使用的是Hibernate+struts+Map技术来处理带N个参数的查询
利用struts里面的<html:link name="map" paramId="参数名" paramName="变量名" paramProperty="变量属性"></html:link>
通过这个可以传递N个参数，
基础类如下：
package cn.com.model;
import java.util.Date;
/**
* Yctsjl generated by MyEclipse Persistence Tools
*/
public class Yctsjl implements java.io.Serializable {
// Fields
private Long id;
private Long mxdydj;
private Long bdzid;
private String bphyy;
private String sfzcyc;
private String ycsfxc;
private Date ycfsrq;
private Date ycxcrq;
private String bz1;
private String bz2;
private String bz3;
private Long hzjlid;
private String bdzmc;
// Constructors
/** default constructor */
public Yctsjl() {
}
/** full constructor */
public Yctsjl(Long mxdydj, Long bdzid, String bphyy, String sfzcyc,
String ycsfxc, Date ycfsrq, Date ycxcrq, String bz1, String bz2,
String bz3, Long hzjlid, String bdzmc) {
this.mxdydj = mxdydj;
this.bdzid = bdzid;
this.bphyy = bphyy;
this.sfzcyc = sfzcyc;
this.ycsfxc = ycsfxc;
this.ycfsrq = ycfsrq;
this.ycxcrq = ycxcrq;
this.bz1 = bz1;
this.bz2 = bz2;
this.bz3 = bz3;
this.hzjlid = hzjlid;
this.bdzmc = bdzmc;
}
// Property accessors
public Yctsjl(Long mxdydj, Long bdzid, String bphyy) {
super();
this.mxdydj = mxdydj;
this.bdzid = bdzid;
this.bphyy = bphyy;
}
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public Long getMxdydj() {
return this.mxdydj;
}
public void setMxdydj(Long mxdydj) {
this.mxdydj = mxdydj;
}
public Long getBdzid() {
return this.bdzid;
}
public void setBdzid(Long bdzid) {
this.bdzid = bdzid;
}
public String getBphyy() {
return this.bphyy;
}
public void setBphyy(String bphyy) {
this.bphyy = bphyy;
}
public String getSfzcyc() {
return this.sfzcyc;
}
public void setSfzcyc(String sfzcyc) {
this.sfzcyc = sfzcyc;
}
public String getYcsfxc() {
return this.ycsfxc;
}
public void setYcsfxc(String ycsfxc) {
this.ycsfxc = ycsfxc;
}
public Date getYcfsrq() {
return this.ycfsrq;
}
public void setYcfsrq(Date ycfsrq) {
this.ycfsrq = ycfsrq;
}
public Date getYcxcrq() {
return this.ycxcrq;
}
public void setYcxcrq(Date ycxcrq) {
this.ycxcrq = ycxcrq;
}
public String getBz1() {
return this.bz1;
}
public void setBz1(String bz1) {
this.bz1 = bz1;
}
public String getBz2() {
return this.bz2;
}
public void setBz2(String bz2) {
this.bz2 = bz2;
}
public String getBz3() {
return this.bz3;
}
public void setBz3(String bz3) {
this.bz3 = bz3;
}
public Long getHzjlid() {
return this.hzjlid;
}
public void setHzjlid(Long hzjlid) {
this.hzjlid = hzjlid;
}
public String getBdzmc() {
return this.bdzmc;
}
public void setBdzmc(String bdzmc) {
this.bdzmc = bdzmc;
}
}
映射文件如下
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="cn.com.model.Yctsjl" table="YCTSJL" schema="MXDLPH">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" scale="0" />
<generator class="sequence" />
</id>
<property name="mxdydj" type="java.lang.Long">
<column name="MXDYDJ" precision="22" scale="0" />
</property>
<property name="bdzid" type="java.lang.Long">
<column name="BDZID" precision="22" scale="0" />
</property>
<property name="bphyy" type="java.lang.String">
<column name="BPHYY" length="30" />
</property>
<property name="sfzcyc" type="java.lang.String">
<column name="SFZCYC" length="1" />
</property>
<property name="ycsfxc" type="java.lang.String">
<column name="YCSFXC" length="1" />
</property>
<property name="ycfsrq" type="java.util.Date">
<column name="YCFSRQ" length="7" />
</property>
<property name="ycxcrq" type="java.util.Date">
<column name="YCXCRQ" length="7" />
</property>
<property name="bz1" type="java.lang.String">
<column name="BZ1" length="30" />
</property>
<property name="bz2" type="java.lang.String">
<column name="BZ2" length="30" />
</property>
<property name="bz3" type="java.lang.String">
<column name="BZ3" length="30" />
</property>
<property name="hzjlid" type="java.lang.Long">
<column name="HZJLID" precision="22" scale="0" />
</property>
<property name="bdzmc" type="java.lang.String">
<column name="BDZMC" />
</property>
</class>
</hibernate-mapping>
Action类如下：
public class YctsjlAction extends BaseAction {
private YctsjlService yctsjlService;
public YctsjlService getYctsjl(){
return (YctsjlService) getWebApplicationContext().getBean("yctsjlService");
}
//返回所有的异常提示记录
public ActionForward yctsjlList(ActionMapping mapping ,ActionForm actionForm
,HttpServletRequest request,HttpServletResponse response)throws Exception {
LazyValidatorForm form = (LazyValidatorForm) actionForm;
yctsjlService = getYctsjl();
String bdzmc =(String )form.get("bdzmc");
String beginDate = (String)form.get("beginDate");
String endDate= (String)form.get("endDate");
System.out.println("endDate"+endDate);
if(bdzmc!=null){
bdzmc = bdzmc.trim();
}
else {
bdzmc = "";
}
if(beginDate!=null) beginDate = beginDate.trim();
else beginDate = "";
if(endDate!=null) endDate = endDate.trim();
else endDate = "";
//分页处理
int pageSize = 3; //定义每页显示记录数量
int currentPage; //定义当前页
String pageNoStr =request.getParameter("page"); //获取当前页码
if(pageNoStr == null || pageNoStr.trim().equals("")){
currentPage = 1;
}
try{
currentPage = Integer.parseInt(pageNoStr.trim());
}
catch(Exception e){
currentPage = 1;
}
List<Yctsjl> list = yctsjlService.findByParameter(bdzmc,beginDate,endDate,currentPage,pageSize);
int count = yctsjlService.getCount(bdzmc, beginDate, endDate); //总的记录条数
int pageCount =yctsjlService.getPageCount(count,pageSize);//获取总页数
PageUtils pageUtil = new PageUtils(currentPage, pageSize, count);
request.setAttribute("pageUtil", pageUtil);
Map pageParmMap = form.getMap();
pageParmMap.remove("page"); 去除上一次的页码值
Map map = new HashMap();
map.putAll(pageParmMap);
request.setAttribute("pageParmMap", map);
request.setAttribute("pageUtil", pageUtil);
request.setAttribute("yctsjlList", list);
return mapping.findForward("list");
}
}
前台页面 list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean" %>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %>
<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>异常提示记录查询页面</title>
<link rel="stylesheet" href="<%=request.getContextPath() %>/css/base1.css" type="text/css" >
<script src="<%=request.getContextPath() %>/js/jquery-1.3.2.js" type="text/javascript"></script>
<script language="JavaScript" type="text/javascript"
src="<%=request.getContextPath()%>/js/calendar/calendar.js"></script>
<script language="JavaScript" type="text/javascript"
src="<%=request.getContextPath()%>/js/calendar/lang/calendar-zh.js"></script>
<script language="JavaScript" type="text/javascript"
src="<%=request.getContextPath()%>/js/calendar/showCalendar.js "></script>
<link rel="stylesheet" href="<%=request.getContextPath()%>/js/calendar/css/calendar-blue.css"
type="text/css" />
</head>
<body>
<h3>异常提示记录</h3>
<html:form action="/jsp/tbdlgl/yctsjl.do?dispatch=yctsjlList " method="post">
<table border="0" cellpadding="0" cellspacing="0" width = "800">
<tr class="style6">
<td width="30%">
变电站名称:<input type="text" id="bdzmc" name="bdzmc" value="<bean:write name="pageParmMap" property="bdzmc"/>">
</td>
<td width="20%" align="center">发生日期:
<input type="text" name="beginDate" id="beginDate" value="<bean:write name="pageParmMap" property="beginDate"/>" size="10">
</td>
<td width="20%" align="center">消除日期:
<input type="text" name="endDate" id="endDate" value="<bean:write name="pageParmMap" property="endDate"/>" size="10">
</td>
<td width="20%" align="center"><input type="submit" name="query" value="查询" ></td>
</tr>
</table>
<br>
<table border="1" cellpadding="1" cellspacing="0" width="800" >
<tr class="style7" align="center">
<td width="7%" >变电站编号</td>
<td width="20%">变电站名称</td>
<td width="12%">母线电压等级</td>
<td width="10%">异常种类</td>
<td width="11%">异常消除情况</td>
<td width="22%">异常发生日期</td>
<td width="22%">异常消除日期</td>
</tr>
<logic:empty name="yctsjlList">
目前没有信息
</logic:empty>
<logic:notEmpty name="yctsjlList">
<logic:iterate id="yctsjl" name="yctsjlList" type="cn.com.model.Yctsjl">
<tr class="style7" align="center">
<td><bean:write name="yctsjl" property="bdzid"/> </td>
<td><bean:write name="yctsjl" property="bdzmc"/> </td>
<td><bean:write name="yctsjl" property="mxdydj"/> </td>
<logic:equal value="" name="yctsjl" property="sfzcyc">
<td>没有记录</td>
</logic:equal>
<logic:equal value="0" name="yctsjl" property="sfzcyc">
<td>非正常异常 </td>
</logic:equal>
<logic:equal value="1" name="yctsjl" property="sfzcyc">
<td>是正常异常 </td>
</logic:equal>
<logic:equal value="" name="yctsjl" property="ycsfxc">
<td>没有记录</td>
</logic:equal>
<logic:equal value="0" name="yctsjl" property="ycsfxc">
<td><font color="red">异常未消除</font></td>
</logic:equal>
<logic:equal value="1" name="yctsjl" property="ycsfxc">
<td>异常已消除</td>
</logic:equal>
<td><bean:write name="yctsjl" property="ycfsrq" format = "yyyy-MM-dd a HH:mm:ss " /> </td>
<td><bean:write name="yctsjl" property="ycxcrq" format = "yyyy-MM-dd a HH:mm:ss "/> </td>
</tr>
</logic:iterate>
</logic:notEmpty>
</table>
<br>
<table width="470" align="center">
<tr align="center" class="style6">
<td>
总共<font color="red"><bean:write name="pageUtil" property="count" /></font>条记录
第<font color="red"><bean:write name="pageUtil" property="page" /></font>页
共<font color="red"><bean:write name="pageUtil" property="pageCount" /></font>页
</td>
<td align="center">
<html:link action="/jsp/tbdlgl/yctsjl.do?dispatch=yctsjlList" name ="pageParmMap" paramId="page" paramName="pageUtil" paramProperty="first">首页</html:link>
</td>
<td align="center">
<html:link action="/jsp/tbdlgl/yctsjl.do?dispatch=yctsjlList" name ="pageParmMap" paramId="page" paramName="pageUtil" paramProperty="previous">上一页</html:link>
</td>
<td align="center">
<html:link action="/jsp/tbdlgl/yctsjl.do?dispatch=yctsjlList" name ="pageParmMap" paramId="page" paramName="pageUtil" paramProperty="next">下一页</html:link>
</td>
<td align="center">
<html:link action="/jsp/tbdlgl/yctsjl.do?dispatch=yctsjlList" name ="pageParmMap" paramId="page" paramName="pageUtil" paramProperty="last">尾页</html:link>
</td>
</tr>
</table>
</html:form>
<script language="JavaScript" type="text/javascript">
var beginDate = document.getElementById('beginDate');
beginDate.onfocus = function() {
return showCalendar(beginDate, '%Y-%m-%d', '24', true);
}
var endDate = document.getElementById('endDate');
endDate.onfocus = function(){
return showCalendar(endDate, '%Y-%m-%d', '24', true);
}
</script>
</body>
</html>
分页处理工具：
package cn.com.utility;
/**
* @author wl
*
*/
public class PageUtils {
private int offSet = 0;
private int page = 1;
private int num = 1;
private int count = 0;
private int pageCount = 1;
private final int first = 1;
private int previous;
private int next;
private int last;
/**
* @param page
* @param num
* @param orderBy
* @param asc
* @param criteria
*/
public PageUtils(int page, int num, int count) {
this.num = num>1?num:1;
this.count = count;
this.pageCount = new Double(Math.ceil(new Float(this.count).floatValue()/new Float(this.num).floatValue())).intValue();
this.pageCount = this.pageCount>1?this.pageCount:1;
this.page = page>1?page:1;
this.page = this.page>pageCount?pageCount:this.page;
this.offSet = this.page*this.num-this.num;
this.previous = this.page>1?this.page-1:1;
this.next = this.page<this.pageCount?this.page+1:this.pageCount;
this.last = this.pageCount;
}
/**
* @return Returns the count.
*/
public int getCount() {
return count;
}
/**
* @return Returns the first.
*/
public int getFirst() {
return first;
}
/**
* @return Returns the last.
*/
public int getLast() {
return last;
}
/**
* @return Returns the next.
*/
public int getNext() {
return next;
}
/**
* @return Returns the num.
*/
public int getNum() {
return num;
}
/**
* @return Returns the offSet.
*/
public int getOffSet() {
return offSet;
}
/**
* @return Returns the page.
*/
public int getPage() {
return page;
}
/**
* @return Returns the pageCount.
*/
public int getPageCount() {
return pageCount;
}
/**
* @return Returns the previous.
*/
public int getPrevious() {
return previous;
}
}
本人也是菜鸟希望多多指教，或有什么好的见解，完全可以发表评论。