ajax+json前端分页小实例
前端jsp<%@ 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.id;var title = jsonObj.news.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 ><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">第一页</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 = "";
}
}
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