AJAX例子 (xml, jsp 技术方向)

juzhibest

浏览: 55468 次
性别:
来自: 济南

最近访客更多访客>>

hanwei1

lifh123

霖啸月

dafeicao

博主相关

博客

微博

相册

留言

关于我

文章分类

社区版块

存档分类

Ajax JSP XML MySQL SQL

今天在W3C school 上看了看ajax.

再结合之前学过的东西外加google.写这么篇文章.

算是javaeye 借我一张草纸,我草稿写在这里.

ajax.html ajax.jsp selectcustomer.js 这几个文件保存在eclipse工程webroot

同一文件夹(AJAXmysql)下. 在工程里面导入mysql的jar包.

ajax.html

<html>
<head>
<script src="selectcustomer.js"></script>
</head>
<body>
<center>
<form name="form">
    选择顾客ID:
<select name="customers" onchange="showCustomer(this.value)">
    <option value="24">000100</option>
    <option value="69">000101</option>
    <option value="73">000102</option>
    <option value="74">000103</option>
    <option value="75">000104</option>
    <option value="80">000105</option>
    <option value="81">000106</option>
    <option value="82">000107</option>
</select>
</form>

ajax.jsp

<%@page contentType="text/html; charset=gb2312" import="java.sql.*"%>
<%
   String sql=(String)request.getParameter("q");
   String str="select id,name,password,age,head_url from users where id = "+sql;
   //String str1="select * from customers";
   Class.forName("com.mysql.jdbc.Driver").newInstance();
   Connection con=java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/rails","root","123456");
   Statement stmt=con.createStatement();
   ResultSet rst=stmt.executeQuery(str);
    while(rst.next())
    {
    response.setContentType("text/xml; charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
out.println("<company>");
out.println("<id>" + rst.getString("id")+ "</id>");
out.println("<name>" + rst.getString("name")+ "</name>");
out.println("<password>" + rst.getString("password")+ "</password>");
out.println("<age>" +rst.getString("age")+ "</age>");
out.println("<head_url>" +rst.getString("head_url")+ "</head_url>");
out.println("</company>");
   }
    //关闭连接、释放资源
    rst.close();
    stmt.close();
    con.close();
%>

selectcustomer.js

var xmlHttp;
function showCustomer(str)
{
xmlHttp=GetXmlHttpObject();
if(xmlHttp==null)
{
alert("Browser does not support HTTP Request");
return ;
}
var url="ajax.jsp";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
xmlHttp.onreadystatechange=stateChanged;
}
function stateChanged()
{
if(xmlHttp.readyState==4||xmlHttp.readyState=="complete")
{
//id,name,password,age,head_url
var xmlDoc=xmlHttp.responseXML.documentElement;
document.getElementById("id").innerHTML= xmlDoc.getElementsByTagName("id")[0].childNodes[0].nodeValue;
document.getElementById("name").innerHTML= xmlDoc.getElementsByTagName("name")[0].childNodes[0].nodeValue;
document.getElementById("password").innerHTML= xmlDoc.getElementsByTagName("password")[0].childNodes[0].nodeValue;
document.getElementById("age").innerHTML= xmlDoc.getElementsByTagName("age")[0].childNodes[0].nodeValue;
document.getElementById("head_url").src= xmlDoc.getElementsByTagName("head_url")[0].childNodes[0].nodeValue;
}
}
function GetXmlHttpObject()
{
var objXMLHttp=null;
if(window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
return objXMLHttp;
}