急求一个jsp+ajax实现分页的例子

急求一个jsp+ajax实现分页的例子,第1张

分页实现步骤:

1. 将Page类引入。需要自己修改的可自行修改。

package com.puckasoft.video.util

public class Page {

private int num //当前页号, 采用自然数计数 1,2,3,...

private int size//页面大小:一个页面显示多少个数据

private int rowCount//数据总数:一共有多少个数据

private int pageCount// 页面总数

private int startRow//当前页面开始行, 第一行是0行

private int first = 1//第一页 页号

private int last//最后页 页号

private int next//下一页 页号

private int prev//前页 页号

private int start//页号式导航, 起始页号

private int end//页号式导航, 结束页号

private int numCount = 10//页号式导航, 最多显示页号数量为numCount+1这里显示11页。

public Page(int size, String str_num, int rowCount) {

int num = 1

if (str_num != null) {

num = Integer.parseInt(str_num)

}

this.num = num

this.size=size

this.rowCount = rowCount

this.pageCount = (int) Math.ceil((double)rowCount/size)

this.num = Math.min(this.num, pageCount)

this.num = Math.max(1, this.num)

this.startRow = (this.num-1) * size

this.last = this.pageCount

this.next = Math.min( this.pageCount, this.num+1)

this.prev = Math.max(1 , this.num-1)

//计算page 控制

start = Math.max(this.num-numCount/2, first)

end = Math.min(start+numCount, last)

if(end-start <numCount){

start = Math.max(end-numCount, 1)

}

}

// 为了节省篇幅,get,set方法省略。

}

2. 引入fenye.jsp / pagination.jsp文件:

<%@ page language="java" contentType="text/htmlcharset=GBK" pageEncoding="GBK"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<meta http-equiv="Content-Type" content="text/htmlcharset=GBK">

</head>

<body>

<%

String url4page = request.getParameter("url4page").trim()

url4page = (url4page.indexOf("?")==-1)?url4page+"?num=":url4page+"&num="

%>

<c:choose>

<c:when test="${page.num != 1}">

<a href="<%=url4page %>${page.first}">首页</a>  

<a href="<%=url4page %>${page.prev}">前一页</a>  

</c:when>

<c:otherwise>

<b>首页</b>  

<b>前一页</b>  

</c:otherwise>

</c:choose>

<c:forEach var="i" begin="${page.start}" end="${page.end}" step="1">

<c:choose>

<c:when test="${page.num != i}">

<a href="<%=url4page %>${i}"><b>[${i}]</b>

</a>  

</c:when>

<c:otherwise>

<b>[${i}]</b>  

</c:otherwise>

</c:choose>

</c:forEach>

<c:choose>

<c:when test="${page.num != page.pageCount}">

<a href="<%=url4page %>${page.next}">后一页</a>  

<a href="<%=url4page %>${page.last}">末页</a>  

</c:when>

<c:otherwise>

<b>末页</b>  

<b>后一页</b>  

</c:otherwise>

</c:choose>

共${page.pageCount}页

<br />

</body>

</html>

3. 在相应servlet/jsp 里面,将需要显示的记录放到list里面,并将list放到request或者session里面:相应servlet写法如下:

<%@ page language="java" import="java.util.*" pageEncoding="GBK" %>

<%@ page import="com.puckasoft.video.dao.*,com.puckasoft.video.vo.*,com.puckasoft.video.util.*" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<%

String path = request.getContextPath()

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

</head>

<body>

<%

//处理总记录数

int rowCount = VideoDao.countAllVideos()

//将Page类放入作用域,以便在jsp页面中显示

Page p1 = new Page(10, request.getParameter("num"), rowCount)

request.setAttribute("page", p1)

//将视频信息放入作用域,以便在页面中显示

List list = VideoDao.listAllVideos(p1.getStartRow(), p1.getSize())

request.setAttribute("vList", list)

%>

<jsp:include flush="true" page="head.jsp"></jsp:include>

<h1>将会列出所有的视频</h1>

<c:forEach items="${requestScope.vList}" var="video">

<a href="display.jsp?vname=${video.vpath}">${video.name}</a><br>

视频标签:${video.label } <br>

视频描述:${video.description } <br>

点击量:${video.count } <br>

作者:${video.userName} <br>

上传时间:${video.createTime} <br><br>

</c:forEach>

<div>

<jsp:include page="fenye.jsp">

<jsp:param name="url4page" value="videos.jsp" />

</jsp:include>

</div>

<jsp:include flush="true" page="foot.jsp"></jsp:include>

</body>

</html>

4. 数据库中查询数据:

public static List listAllVideos(int startRow,int size) {

Connection conn=null

PreparedStatement ps=null

String sql = "select video.id,vpath,name,label,count,description,userName,video.createTime from video join user on user.id=video.userId order by createTime desc limit ?,? "

ResultSet rs = null

List list = new ArrayList()

try {

conn= DBConn.getConnection()

ps = conn.prepareStatement(sql)

ps.setInt(1, startRow)

ps.setInt(2, size)

rs = ps.executeQuery()

while(rs.next()){

com.puckasoft.video.vo.Video video = new com.puckasoft.video.vo.Video(rs.getInt("id"),rs.getString("vpath"),

rs.getString("name"),rs.getString("label"),rs.getString("description"),

rs.getString("userName"),rs.getInt("count"),rs.getTimestamp("createTime"))

list.add(video)

}

} catch (SQLException e) {

e.printStackTrace()

}finally {

DBConn.close(ps, conn)

}

return list

}

public static int countAllVideos(){

Connection conn=null

PreparedStatement ps=null

String sql = "select count(*) from video"

ResultSet rs = null

int count=0

try {

conn= DBConn.getConnection()

ps = conn.prepareStatement(sql)

rs = ps.executeQuery()

while(rs.next()){

count=rs.getInt(1)

}

} catch (SQLException e) {

e.printStackTrace()

}finally {

DBConn.close(ps, conn)

}

return count

}

ajax请求后台拿到json类型的数据后,可以在它的success回调方法中进行动态分页,也就是表格重绘,此时,我们需要得到的数据包括:查询得到的数据、数据总条数、总页数、当前页数,其中前三条可在后台获取,对于当前页数,需要从前端获取点击页数再通过请求传递给后台,后台做完相应处理后再传回给前端。

/**

*

* @param page 当前页

*/

function getData(page){

var schoolid = $("#schoolid option:selected").text()

var apptype = $("#apptype option:selected").text()

var appname = $("#appname").val()

$.ajax({

type : "POST",

url : "pageAjax",

dataType : "json",

data : {'schoolid':schoolid,'apptype':apptype,'page':page,'appname':appname},

success : function(data){

console.log("成功了!"+data)

$("#table").html("")

$(".turn_page").html("")

var str = "<tr><th class='w20'>应用编号</th>"

+"<th class='w15'>学校名称</th>"

+"<th class='w30'>应用名称</th>"

+"<th class='w25'>应用分类</th>"

+"<th class='w10'>应用类型</th></tr>"

for(var i=0i<data.resultList.lengthi++){

str += "<tr οnclick='showAppDetail(this)'><td>"+data.resultList[i].appid+"</td><td>"

+data.resultList[i].schoolid+"</td><td>"+data.resultList[i].appname+"</td><td>"

+data.resultList[i].app_departid+"</td><td>"+data.resultList[i].apptype+"</td></tr>"

}

$("#table").html(str)        //重绘table

var pageNum = data.pageNum    //获取得到的数据页数

var curPage = data.curPage    //获取当前页

str = ""

/*若页数大于1则添加上一页、下一页链接*/

if(data.pageNum>1){

str = "<ul><li><a href='javascript:void(0)οnclick=preEvent()' id='pre' data-num='1'>上一页</a></li>"

}else{

str = "<ul>"

}

/*循环输出每一页的链接*/

for(var i=0i<data.pageNumi++){

str += "<li><a href='javascript:void(0)οnclick=getData("+(parseInt(i)+1)+")' data-type='num'>"+(parseInt(i)+1)+"</a></li>"

}

if(str.indexOf("上一页")>-1){

str += "<li><a href='javascript:void(0)οnclick=nextEvent()' id='next' data-num='1'>下一页</a></li>"

+"<span>共<span id='pageNum'>"+pageNum+"</span>页</span></ul>"

}else{

str += "<span>共<span id='pageNum'>"+pageNum+"</span>页</span></ul>"

}

$(".turn_page").html(str)

//把当前页码存到上一页、下一页的data-num属性中,这样可以在点击上一页或者下一页时知道应该跳到哪页

$("#pre").attr("data-num",curPage)

$("#next").attr("data-num",curPage)

},

error : function(data){

alert("请求失败")

}

})

}

/**

* 上一页点击事件

*/

function preEvent(){

var curPage = $("#pre").attr("data-num")

if(curPage<=1){

$(this).attr('disabled',"true")

}else{

curPage = parseInt(curPage)-1

getData(curPage)

}

}

/**

* 下一页点击事件

*/

function nextEvent(){

var curPage = $("#next").attr("data-num")

var pageNum = $("#pageNum").text()

if(curPage>=pageNum){

$(this).attr('disabled',"true")

}else{

curPage = parseInt(curPage)+1

getData(curPage)

}

}

对应的HTML代码

<div class="table">

<table id="table">

</table>

</div>

<div class="turn_page">

</div>

注意:标签的href属性,如href=”javascript:void(0)οnclick=getData()” 

要让原来的点击事件失去响应,重新给它定义点击事件,要给它加上javascript:void(0)这句话,若写的是href=”#”的话,点击默认会跳到页面顶部。 

另外,ajax请求数据无刷新翻页是异步请求,所以标签的点击事件要写在它的属性里,如上例,若写在js当中,会造成 

页面还没加载出来,事件就已经触发,导致没有任何响应


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原文地址: http://outofmemory.cn/sjk/9906325.html

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