关于Java 后台分页

原理，前台传入每页显示条数，及当前的页码后台有条件查询显示到页面上

页面上显示样式为

本例子：是点击查询按钮获得数据进行分页的情况（如页面已加载就获得数据只需初始化时就调用方法即可）

首先是前台

jsp 页面用于显示分页的结构

<ul class="page" maxshowpageitem="6" pagelistcount="10" id="page"></ul>

jsp 页面需引入

<link href="page.css" type="text/css" rel="stylesheet" />
<script language='javascript' type='text/javascript' src="page.js"></script>

js:

/**
 * 点击查询按钮 查询列表数据 
 */
function queryGXLXMCData2(pageIndex,callSucFlag){
		  var sub = new WingsSubmit();
		　//设置分页数据
			if(!pageIndex) {
				pageIndex = 1;
			}
			sub.pushData("pageIndex", pageIndex);//当前是第几页
			sub.pushData("pageNumber", 10);//每页10条数据
			sub.setCtrl('GxfxCtrl_queryGxmcList');
			if(callSucFlag) {
				sub.setFunction("onSuccess", "loadQueryDataSuccess();");
			}
			sub.submit();
}   
function queryGXLXMCData(pageIndex){
		  var sub = new WingsSubmit();
		  sub.pushData("gxmcs", ywcjcode);
		//设置分页数据
			if(!pageIndex) {
				pageIndex = 1;
			}
			sub.pushData("pageIndex", pageIndex);//当前是第几页
			sub.pushData("pageNumber", 10);//每页10条数据
			sub.setCtrl('GxfxCtrl_queryGxmcList');
			sub.setFunction("onSuccess", "loadQueryDataSuccess();");
			sub.submit();
}   

function loadQueryDataSuccess(res) {
	$('#cxgxGrid').show();
	var dataNumber = res.getAttr("pageCount");
	$("#page").show();
	setPage(dataNumber);
}
//设置分页
function setPage(pageCount) {
	pageNumber = $("#page").attr("pagelistcount");
	$("#page").initPage(pageCount,1,function(p) {
		queryGXLXMCData2(p);
	});
}

　ctrl:

//分页 查询数据的一共的条数------------------------------------------------------
        final Map<String, Object> pageMap = (Map<String, Object>) SwordServiceUtils.callService("SWZJ.DSJYPT.GXYT005.GETDATAMAXNUMBER", map);
        final int dataNumInt = Integer.parseInt(pageMap.get("maxnum")+"");
//分页 查询当前请求的数据------------------------------------------------------

final List<Map<String, Object>> cxgxAllList = (List<Map<String, Object>>) SwordServiceUtils .callService("SWZJ.DSJYPT.GXYT005.QUERGXCXALLDATA", map);
 res.addTable("cxgxGrid", cxgxAllList); 
res.addAttr("pageCount", dataNumInt);
 return res;

　　后台：

DAO:

//查询一共多少条数据 用于分页  sql: "select COUNT(*) maxNum from mx_gxyt_fxdpzb b,mx_gxyt_gxlxdm m where b.gxlx_dm=m.gxlx_dm and b.ywcj_dm = ?"

 public Map<String, Object> getAllDataCount(Map<String, Object> map) throws SwordBaseCheckedException {
        final SQLParam param = new SQLParam();

        final String gxmcs = (String) map.get("gxmcs");

        if (CastUtils.isNull(gxmcs)) {
            param.addParam(gxmcs);
        } else {
            param.addParam(gxmcs);
        }
        final Map<String, Object> listResulMap = SwordPersistenceUtils.getPersistenceService().queryMapByKey("hdxt_dsjypt_gxyt000031_glfxsballgxcount", param);
        if (CastUtils.isNull(listResulMap)) {
            final Map<String, Object> resultNum = new HashMap<String, Object>();
            resultNum.put("maxnum", 0);
            return resultNum;
        }
        return listResulMap;
    }

//用于查询每页数据  sql:select m.gxlx_dm,m.gxlxmc,c.gxlxmc as glgxlx ,b.fxd,c.gxlx_dm as sjgxdm  from mx_gxyt_gxlxdm m left join mx_gxyt_gxlxdm c
 on m.sjgxlx_dm = c.gxlx_dm left join mx_gxyt_fxdpzb b on b.gxlx_dm=m.gxlx_dm  where b.ywcj_dm=? and b.fxd>0 LIMIT ?,?

public List<Map<String, Object>> queryCxgxAllList(Map<String, Object> map) throws SwordBaseCheckedException {
        final SQLParam param = new SQLParam();
        final String gxmcs = (String) map.get("gxmcs");

        if (CastUtils.isNull(gxmcs)) {
            param.addParam(gxmcs);
        } else {
            param.addParam(gxmcs);
        }

        final String pageIndex = map.get("pageIndex") + "";
        final String pageNumber = map.get("pageNum") + "";

        param.addParam((Integer.parseInt(pageIndex) - 1) * Integer.parseInt(pageNumber));

        param.addParam(Integer.parseInt(pageIndex) * Integer.parseInt(pageNumber));

        List<Map<String, Object>> result = this.getPersistenceService().queryMapListByKey("hdxt_dsjypt_gxyt000032_glfxsballgxpage", param);
        result = getLastListMap(result, Integer.parseInt(pageNumber));
        return result;

    }
//获取list的最后10条数据
private List<Map<String, Object>> getLastListMap(List<Map<String, Object>> list, int sizeNum) {
        final int curSize = list.size();
        if (curSize < sizeNum) {
            return list;
        }
        final List<Map<String, Object>> reList = new ArrayList<Map<String, Object>>();
        for (int i = 0; i < sizeNum; i++) {
            reList.add(list.get(curSize - sizeNum + i));
        }
        return reList;
    }

　　page.css

.zzsc{ margin:0 auto; 580px; height:80px; border:1px solid #F00} 
.page{
    list-style: none;
}
.page>li{
    float: left;
    padding: 5px 10px;
    cursor: pointer;
}
.page .pageItem{
    border: solid thin #DDDDDD;
    margin: 5px;
}
.page .pageItemActive{
    border: solid thin #0099FF;
    margin: 5px;
    background-color: #0099FF;
    color:white;
}
.page .pageItem:hover{
    border: solid thin #0099FF;
    background-color: #0099FF;
    color:white;
}
.page .pageItemDisable{
    border: solid thin #DDDDDD;
    margin: 5px;
    background-color: #DDDDDD;
}

　　page.js

/**
 * Created by zxm on 2017/3/31.
 */
$.fn.extend({
    "initPage":function(listCount,currentPage,fun){
        var maxshowpageitem = $(this).attr("maxshowpageitem");
        if(maxshowpageitem!=null&&maxshowpageitem>0&&maxshowpageitem!=""){
            page.maxshowpageitem = maxshowpageitem;
        }
        var pagelistcount = $(this).attr("pagelistcount");
        if(pagelistcount!=null&&pagelistcount>0&&pagelistcount!=""){
            page.pagelistcount = pagelistcount;
        }

        var pageId = $(this).attr("id");
        page.pageId=pageId;
        if(listCount<0){
            listCount = 0;
        }
        if(currentPage<=0){
            currentPage=1;
        }
        page.setPageListCount(listCount,currentPage,fun);

    }
});
var  page = {
    "pageId":"",
    "maxshowpageitem":5,//最多显示的页码个数
    "pagelistcount":10,//每一页显示的内容条数
    /**
     * 初始化分页界面
     * @param listCount 列表总量
     */
    "initWithUl":function(listCount,currentPage){
        var pageCount = 1;
        if(listCount>=0){
            var pageCount = listCount%page.pagelistcount>0?parseInt(listCount/page.pagelistcount)+1:parseInt(listCount/page.pagelistcount);
        }
        var appendStr = page.getPageListModel(pageCount,currentPage);
        $("#"+page.pageId).html(appendStr);
    },
    /**
     * 设置列表总量和当前页码
     * @param listCount 列表总量
     * @param currentPage 当前页码
     */
    "setPageListCount":function(listCount,currentPage,fun){
        listCount = parseInt(listCount);
        currentPage = parseInt(currentPage);
        page.initWithUl(listCount,currentPage);
        page.initPageEvent(listCount,fun);
        fun(currentPage);
    },
    "initPageEvent":function(listCount,fun){
        $("#"+page.pageId +">li[class='pageItem']").on("click",function(){
            page.setPageListCount(listCount,$(this).attr("page-data"),fun);
        });
    },
    "getPageListModel":function(pageCount,currentPage){
        var prePage = currentPage-1;
        var nextPage = currentPage+1;
        var prePageClass ="pageItem";
        var nextPageClass = "pageItem";
        if(prePage<=0){
            prePageClass="pageItemDisable";
        }
        if(nextPage>pageCount){
            nextPageClass="pageItemDisable";
        }
        var appendStr ="";
        appendStr+="<li class='"+prePageClass+"' page-data='1' page-rel='firstpage'>首页</li>";
        appendStr+="<li class='"+prePageClass+"' page-data='"+prePage+"' page-rel='prepage'>&lt;上一页</li>";
        var miniPageNumber = 1;
        if(currentPage-parseInt(page.maxshowpageitem/2)>0&&currentPage+parseInt(page.maxshowpageitem/2)<=pageCount){
            miniPageNumber = currentPage-parseInt(page.maxshowpageitem/2);
        }else if(currentPage-parseInt(page.maxshowpageitem/2)>0&&currentPage+parseInt(page.maxshowpageitem/2)>pageCount){
            miniPageNumber = pageCount-page.maxshowpageitem+1;
            if(miniPageNumber<=0){
                miniPageNumber=1;
            }
        }
        var showPageNum = parseInt(page.maxshowpageitem);
        if(pageCount<showPageNum){
            showPageNum = pageCount
        }
        for(var i=0;i<showPageNum;i++){
            var pageNumber = miniPageNumber++;
            var itemPageClass = "pageItem";
            if(pageNumber==currentPage){
                itemPageClass = "pageItemActive";
            }

            appendStr+="<li class='"+itemPageClass+"' page-data='"+pageNumber+"' page-rel='itempage'>"+pageNumber+"</li>";
        }
        appendStr+="<li class='"+nextPageClass+"' page-data='"+nextPage+"' page-rel='nextpage'>下一页&gt;</li>";
        //appendStr+="<li class='"+nextPageClass+"' page-data='"+pageCount+"' page-rel='lastpage'>尾页</li>";
       return appendStr;

    }
}