基于jqGrid实现列表分页效果（后台处理以及pageBean）

基于jqGrid实现列表分页效果（后台处理）

目录

[TOC]

前端使用jqGrid配置实现分页展示

代码块

jsonReader: {
/* rows: 后台返回数据list集合
currPage: 当前页
totalpages: 总页数
totalCount: 总记录数
*/
root:"rows", page:"currPage", total:"totalpages",          //   很重要 定义了 后台分页参数的名字。
records:"totalCount", repeatitems:false, id : "id"
}

后台创建分页pageBean

代码块

package com.kingdee.eas.custom.database.certificate;

public class CertificateQueryPage {
private int curPage =1; //当前页
private int totalPage; // 总页数
private int totalCount; // 总行数
private int pageSize=20; // 每页行数

public CertificateQueryPage(int rows, Integer curPage,Integer pageSize){
this.totalCount = rows;
this.curPage = curPage;
this.pageSize=pageSize;
if(this.totalCount % this.pageSize ==0){
this.totalPage = this.totalCount/this.pageSize;
}else if (rows < this.pageSize){
this.totalPage =1;
}else{
this.totalPage = this.totalCount/this.pageSize +1;
}
}

4000
public CertificateQueryPage(int rows) {
this.totalCount=rows;
if(this.totalCount % this.pageSize ==0){
this.totalPage =this.totalCount/this.pageSize;
}else if(rows < this.pageSize){
this.totalPage=1;
}else {
this.totalPage =this.totalCount/this.pageSize +1;
}
}
public int getCurPage() {
return curPage;
}
public void setCurPage(int curPage) {
this.curPage = curPage;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

}

后台handler实现分页

代码块

// 分頁
String page = request.getParameter("page");
String pageSizeR = request.getParameter("rows");
CertificateQueryPage queryPage =null;
if(!StringUtils.isEmpty(page) || !StringUtils.isEmpty(pageSizeR)){
queryPage = new CertificateQueryPage(dataList.size(),Integer.valueOf(page),Integer.valueOf(pageSizeR));
}else{
queryPage = new CertificateQueryPage(dataList.size());
}
//CertificateQueryPage
int pageSize = queryPage.getPageSize();
int curPage = queryPage.getCurPage();
int fromIndex =(curPage -1)*pageSize;//开始索引
int toIndex = curPage*pageSize;// 结束索引
if(toIndex> queryPage.getTotalCount()){// 如果结束索引大于list的size，则结束索引等于lise的size
toIndex =queryPage.getTotalCount();
}
if(fromIndex > toIndex){// 如果开始索引大于结束索引，则
fromIndex=0;
}
// dataList为数据总量，这里通过subList函数返回分页结果数据
// gridDataMap 为后台返回前端的Map gridDataMap = new LinkedHashMap()数据集；这里使用LinkedHashMap的目的，保证数据排序前后端不混乱
List list = dataList.subList(fromIndex, toIndex);
gridDataMap.put("rows", list);
gridDataMap.put("currPage", curPage);
gridDataMap.put("totalpages", queryPage.getTotalPage());
gridDataMap.put("totalCount", queryPage.getTotalCount());