ajax

最新推荐文章于 2025-08-08 15:43:57 发布

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最新推荐文章于 2025-08-08 15:43:57 发布

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分类专栏： h5 文章标签： ajax

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本文介绍了一个使用原生JavaScript的Ajax请求示例，通过POST方式向MyServlet发送用户名和密码，并展示如何处理响应。

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ajax原生请求

<%@ 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>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
<script type="text/javascript">
    function Test() {
        var name = document.getElementsByName('username')[0].value;
        var pwd = document.getElementsByName('password')[0].value;
        alert(name);

    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open("POST","servlet/MyServlet",true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    var context = "name="+name+"&pwd="+pwd;
    alert(context);
    xmlhttp.send(context);
    //xmlhttp.send();
    xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    alert(xmlhttp.responseText);
    }
  }
    }

     </script>
</head>

<body>
    <form action="servlet/MyServlet" method="post">
        账户：<input name="username"></br>
         密码：<input name="password"></br>
        <input  type="button" onclick="Test()" value="确定">
    </form>
</body>
</html>