ajax訪問jsp
㈠ 用ajax讀取資料庫里的數據,怎麼可以傳到jsp頁面呢!!
首先要將取得的數據封裝成json字元串，這個你自己寫。
大概是這樣的：
比方說User對象有name和password，
可以封裝成
String jsonStr = "{"userList":[{\"name\":\"tom\",\"password\":\"123\"},{\"name\":\"jurry\",\"password\":\"123\"}]}";
action中調用response的getWriter().println(jsonStr);
將json字元串寫會到ajax。
ajax裡面的dataType設置為「json"
然後在」success":function(data){
data.userList[0].name;
data.userList[1].password
}
就可以調用返回的json對象了
㈡ jsp中，用ajax獲取數據
jsp中用ajax獲取數據的例子如下：
jsp代碼：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>
<TITLE>留學生系統</TITLE>
<META http-equiv=Content-Type content="text/html; charset=GBK">
<SCRIPT language=JavaScript type=text/JavaScript>
var XMLHttpReq = false;
//ajax介面
function createXMLHttpRequest(){
if(window.XMLHttpRequest){
XMLHttpReq = new XMLHttpRequest();
}else if(window.ActiveXObject){
try{
XMLHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
}catch(e){
try{
XMLHttpReq = new ActiveXObject("Mircsoft.XMLHTTP");
}catch(e1){}
}
}
}
function sendRequest(url){
createXMLHttpRequest();
XMLHttpReq.open("GET",url,true);
XMLHttpReq.onreadystatechange = processResponse;
XMLHttpReq.send(null);
}
function processResponse(){
if(XMLHttpReq.readyState == 4){
if(XMLHttpReq.status == 200){
var res = XMLHttpReq.responseXML.getElementsByTagName("res")[0].firstChild.data;
window.alert(res);
document.myform.userid.value="";
document.myform.pwd.value="";
}else{
window.alert("你請求的頁面有異常1");
}
}
}
function userCheck(){
var userid = document.myform.userid.value;
var pwd = document.myform.pwd.value;
if(userid == ""){
window.alert("用戶名不能為空");
document.myform.pwd.value="";
document.myform.userid.focus();
return false;
}else{
sendRequest("login?userid="+userid);
}
}
function pwdCheck(){
var pwd = document.myform.pwd.value;
var pwd2 = document.myform.pwd2.value;
if(pwd!=pwd2){
window.alert("密碼不一致");
document.myform.pwd.value="";
document.myform.pwd2.value="";
document.myform.pwd.focus();
return false;
}
}
</SCRIPT>
<LINK href="css/css.css" type=text/css rel=stylesheet>
</HEAD>
<body>
<table width="778" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" >
<tr>
<td width="17%"><img src="images/logo.jpg" width="124" height="101"></td>
<td width="558" height="101" background="images/banner.jpg"><div align="center">
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="558" height="101">
<param name="movie" value="images/2.swf">
<param name="quality" value="high">
<embed src="images/2.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="558" height="101"></embed>
<param name="wmode" value="transparent">
</object>
</div></td>
<td width="11%"><table width="100%" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td height="30" class="style1"><div align="center">設為首頁</div></td>
</tr>
<tr>
<td height="30" class="style1"><div align="center">收藏本站</div></td>
</tr>
<tr>
<td height="30" class="style1"><div align="center">聯系我們</div></td>
</tr>
</table></td>
</tr>
</table>
<form method="post" action="control.jsp?action=register" name="myform">
<table width="300" border="0" align="center" bgcolor="#F0F0F0">
<tr>
<td align="center">用戶名</td>
<td><input name="userid" type="text" size="20" onblur="userCheck()"></td>
</tr>
<tr>
<td align="center">真實姓名</td>
<td><input name="username" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">性別</td>
<td>
<input type="radio" name="sex" value="0" checked="checked">男
<input type="radio" name="sex" value="1">女
</td>
</tr>
<tr>
<td align="center">密碼</td>
<td><input name="pwd" type="password" size="20"/></td>
</tr>
<tr>
<td align="center">密碼確認</td>
<td><input name="pwd2" type="password" size="20" onblur="pwdCheck()"/></td>
</tr>
<tr>
<td align="center">電子郵箱</td>
<td><input name="email" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">學校</td>
<td><input name="school" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">電話號碼</td>
<td><input name="phonenum" type="text" size="20"/></td>
</tr>
<tr>
<td align="center"><img border=0 src="image.jsp"></td>
<td><input type=text name=in maxlength=4 size="8"></td>
</tr>
<tr>
<td align="center"><input type="submit" value="確定" /></td>
</tr>
</table>
</form>
</body>
</html>