ajax+json前端分页小实例
前端jsp
ajax_func.js
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>11111</title>
<link href="../css/style.css" rel="stylesheet" type="text/css">
<script language="javascript" src="function/ajax_func.js"></script>
<script language="javascript" src="function/json.js"></script>
<script language="javascript">
//页面加载，获取第一页的新闻列表
function winload() {
send_request("get","newsManager?currentPage=1",null,"XML",populateList);
}
//将所获取的新闻列表填充到页面的相应位置
function populateList() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
var jsonCon = http_request.responseText.parseJSON();
var jsonObj = eval(jsonCon);
var currentPage = jsonObj.currentPage;
var totalPage = jsonObj.totalPage;
var prePage = parseInt(currentPage) - 1;
var nextPage = parseInt(currentPage) + 1;
var newslist = jsonObj.news;
var innerHTML = "";
if((newslist!=null)&&(newslist.length!=0)) {
innerHTML += "<table width=\"100%\" cellpadding=\"2\" cellspacing=\"0\" border=\"0\">\r\n";
innerHTML += "<tr><td width='10%' height='25'>ID</td><td width='65%'>标题</td></tr>";
for(var i=0;i<newslist.length;i++) {
var id = jsonObj.news[i].id;
var title = jsonObj.news[i].name;
innerHTML += "<tr>";
innerHTML += "<td width='10%' height='25'>"+id+"</td>";
innerHTML += "<td width='65%' height='25'>"+title+"</td>";
innerHTML += "</tr>";
}
innerHTML += "</table>\r\n";
}else {
innerHTML += "暂时没有任何信息";
}
//Download by http://www.codefans.net
//window.alert(currentPage+"|"+nextPage+"|"+prePage+"|"+totalPage);
document.getElementById("newslist").innerHTML = innerHTML;
document.getElementById("prePage").innerHTML="<a href=\"javascript:void(0)\" onClick=\"goToPage('"+prePage+"')\">上一页</a>";
document.getElementById("nextPage").innerHTML="<a href=\"javascript:void(0)\" onClick=\"goToPage('"+nextPage+"')\">下一页</a>";
document.getElementById("lastPage").innerHTML="<a href=\"javascript:void(0)\" onClick=\"goToPage('"+totalPage+"')\">最末页</a>";
//window.alert(currentPage);
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
//页面跳转
function goToPage(page) {
send_request("get","newsManager?currentPage="+page,null,"XML",populateList);
}
</script>
</head>
<body onLoad="winload()">
<table width="500" border="0" cellspacing="0" cellpadding="4">
<tr>
<td align="center">1111</td>
</tr>
</table>
<table width="500" border="0" cellspacing="0" cellpadding="4">
<tr>
<td align="center" height="200" valign="top">
<label id="newslist"></label>
</td>
</tr>
</table>
<table width="500" border="0" cellspacing="0" cellpadding="4">
<tr>
<td align="center">
<label id="firstPage">[url=javascript:void(0)]第一页[/url]</label>
<label id="prePage">上一页</label>
<label id="nextPage">下一页</label>
<label id="lastPage">最末页</label>
</td>
</tr>
</table>
</body>
</html>
ajax_func.js
//定义XMLHttpRequest对象实例
var http_request = false;
//定义可复用的http请求发送函数
function send_request(method,url,content,responseType,callback) {//初始化、指定处理函数、发送请求的函数
http_request = false;
//开始初始化XMLHttpRequest对象
if(window.XMLHttpRequest) { //Mozilla 浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {//设置MiME类别
http_request.overrideMimeType("text/xml");
}
}
else if (window.ActiveXObject) { // IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) { // 异常，创建对象实例失败
window.alert("不能创建XMLHttpRequest对象实例.");
return false;
}
if(responseType.toLowerCase()=="text") {
//http_request.onreadystatechange = processTextResponse;
http_request.onreadystatechange = callback;
}
else if(responseType.toLowerCase()=="xml") {
//http_request.onreadystatechange = processXMLResponse;
http_request.onreadystatechange = callback;
}
else {
window.alert("响应类别参数错误。");
return false;
}
// 确定发送请求的方式和URL以及是否异步执行下段代码
if(method.toLowerCase()=="get") {
http_request.open(method, url, true);
}
else if(method.toLowerCase()=="post") {
http_request.open(method, url, true);
http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
}
else {
window.alert("http请求类别参数错误。");
return false;
}
http_request.send(content);
}
// 处理返回文本格式信息的函数
function processTextResponse() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
//alert(http_request.responseText);
alert("Text文档响应。");
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
//处理返回的XML格式文档的函数
function processXMLResponse() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
//alert(http_request.responseXML);
alert("XML文档响应。");
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
servlet
package com.eamoi.ajax;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class NewsJsonService {
public NewsJsonService(){
}
public List getNews(){
StringBuffer sb = new StringBuffer();
List l = new ArrayList();
try{
// File f = new File(System.getProperty("user.dir")+File.separator+"src"+File.separator+"news.txt");
// FileReader fr = new FileReader(f);
// BufferedReader bf = new BufferedReader(fr);
// String strObj;
// while ((strObj = bf.readLine()) != null) {
// sb.append(strObj);
// }
Map map1 = new HashMap();
map1.put("0", "aa");
map1.put("1", "bb");
Map map2 = new HashMap();
map2.put("0", "aa2");
map2.put("1", "bb2");
Map map3 = new HashMap();
map3.put("0", "aa3");
map3.put("1", "bb3");
Map map4 = new HashMap();
map4.put("0", "aa4");
map4.put("1", "bb4");
Map map5 = new HashMap();
map5.put("0", "aa6");
map5.put("1", "bb6");
Map map6 = new HashMap();
map6.put("0", "aa6");
map6.put("1", "bb6");
Map map7 = new HashMap();
map7.put("0", "7aa");
map7.put("1", "b7b");
Map map8 = new HashMap();
map8.put("0", "a8a");
map8.put("1", "b8b");
Map map9 = new HashMap();
map9.put("0", "a9a");
map9.put("1", "b9b");
Map map10 = new HashMap();
map10.put("0", "a00a");
map10.put("1", "b00b");
Map map11 = new HashMap();
map11.put("0", "a111a");
map11.put("1", "b111b");
l.add(map1);
l.add(map2);
l.add(map3);
l.add(map4);
l.add(map5);
l.add(map6);
l.add(map7);
l.add(map8);
l.add(map9);
l.add(map10);
l.add(map11);
// for(int i= 0;i<2;i++){
// map.put(i+"", i+"s");
// }
//
// l = new ArrayList();
// for(int j=0;j<10;j++){
// l.add(map);
// }
}catch (Exception e){
e.printStackTrace();
}
return l;
}
public static void main(String[] args){
NewsJsonService nj = new NewsJsonService();
nj.getNews();
String i = "";
}
}