解讀jsp+ajax自動(dòng)刷新實(shí)例

2024-09-01 08:26:25

字體：大中小

供稿：網(wǎng)友

一、JSP文件：auto.jsp
<%@ page contentType="text/html; charset=gb2312" %>

<%
//設(shè)置輸出信息的格式及字符集
response.setContentType("text/xml; charset=UTF-8");
response.setHeader("Cache-Control","no-cache");
out.println("<response>");

for(int i=0;i<2;i++){
out.println("<name>"+(int)(Math.random()*10)+"型筆記本</name>");
out.println("<count>" +(int)(Math.random()*100)+ "</count>");
}
out.println("</response>");
out.close();

%>

二、html文件：autoRefresh.html
<head>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
</head>
<script language="javascript">
var XMLHttpReq;
//創(chuàng)建XMLHttpRequest對(duì)象
function createXMLHttpRequest() {
if(window.XMLHttpRequest) { //Mozilla 瀏覽器
XMLHttpReq = new XMLHttpRequest();
}
else if (window.ActiveXObject) { // IE瀏覽器
try {
XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
}
//發(fā)送請(qǐng)求函數(shù)
function sendRequest() {
createXMLHttpRequest();
var url = "auto.jsp";
XMLHttpReq.open("GET", url, true);
XMLHttpReq.onreadystatechange = processResponse;//指定響應(yīng)函數(shù)
XMLHttpReq.send(null); // 發(fā)送請(qǐng)求
}
// 處理返回信息函數(shù)
function processResponse() {
if (XMLHttpReq.readyState == 4) { // 判斷對(duì)象狀態(tài)
if (XMLHttpReq.status == 200) { // 信息已經(jīng)成功返回，開(kāi)始處理信息
DisplayHot();
setTimeout("sendRequest()", 1000);
} else { //頁(yè)面不正常
window.alert("您所請(qǐng)求的頁(yè)面有異常。");
}
}
}
function DisplayHot() {
var name = XMLHttpReq.responseXML.getElementsByTagName("name")[0].firstChild.nodeValue;
var count = XMLHttpReq.responseXML.getElementsByTagName("count")[0].firstChild.nodeValue;
document.getElementById("product").innerHTML = name;
document.getElementById("count").innerHTML = count;
}

</script>

<body onload =sendRequest()>
<table style="BORDER-COLLAPSE: collapse" borderColor=#111111
cellSpacing=0 cellPadding=0 width=200 bgColor=#f5efe7 border=0>
<TR>
<TD align=middle height=4 colspan="2"><IMG height=4
src="images/promo_list_top.gif" width="100%"
border=0>
</TD>
</TR>
<TR>
<TD align=middle bgColor=#dbc2b0
height=19 colspan="2"><B>正在熱賣的筆記本</B>
</TD>
</TR>
<tr>
<td height="20">
型號(hào)：
</td>
<td height="20" id="product">
</td>
</tr>
<tr>
<td height="20">
銷售數(shù)量：
</td>
<td height="20" id="count">
</td>
</tr>
</body>
</table>